Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/skimage/feature/tests/__init__.py

@@ -0,0 +1,9 @@
+from ..._shared.testing import setup_test, teardown_test
+
+
+def setup():
+    setup_test()
+
+
+def teardown():
+    teardown_test()

venv/Lib/site-packages/skimage/feature/tests/test_blob.py

@@ -0,0 +1,445 @@
+import numpy as np
+from skimage.draw import disk
+from skimage.draw.draw3d import ellipsoid
+from skimage.feature import blob_dog, blob_log, blob_doh
+from skimage.feature.blob import _blob_overlap
+import math
+from numpy.testing import assert_almost_equal
+
+
+def test_blob_dog():
+    r2 = math.sqrt(2)
+    img = np.ones((512, 512))
+
+    xs, ys = disk((400, 130), 5)
+    img[xs, ys] = 255
+
+    xs, ys = disk((100, 300), 25)
+    img[xs, ys] = 255
+
+    xs, ys = disk((200, 350), 45)
+    img[xs, ys] = 255
+
+    blobs = blob_dog(img, min_sigma=5, max_sigma=50)
+    radius = lambda x: r2 * x[2]
+    s = sorted(blobs, key=radius)
+    thresh = 5
+
+    b = s[0]
+    assert abs(b[0] - 400) <= thresh
+    assert abs(b[1] - 130) <= thresh
+    assert abs(radius(b) - 5) <= thresh
+
+    b = s[1]
+    assert abs(b[0] - 100) <= thresh
+    assert abs(b[1] - 300) <= thresh
+    assert abs(radius(b) - 25) <= thresh
+
+    b = s[2]
+    assert abs(b[0] - 200) <= thresh
+    assert abs(b[1] - 350) <= thresh
+    assert abs(radius(b) - 45) <= thresh
+
+    # Testing no peaks
+    img_empty = np.zeros((100,100))
+    assert blob_dog(img_empty).size == 0
+
+    # Testing 3D
+    r = 10
+    pad = 10
+    im3 = ellipsoid(r, r, r)
+    im3 = np.pad(im3, pad, mode='constant')
+
+    blobs = blob_dog(im3, min_sigma=3, max_sigma=10,
+                          sigma_ratio=1.2, threshold=0.1)
+    b = blobs[0]
+
+    assert b.shape == (4,)
+    assert b[0] == r + pad + 1
+    assert b[1] == r + pad + 1
+    assert b[2] == r + pad + 1
+    assert abs(math.sqrt(3) * b[3] - r) < 1
+
+    # Testing 3D anisotropic
+    r = 10
+    pad = 10
+    im3 = ellipsoid(r / 2, r, r)
+    im3 = np.pad(im3, pad, mode='constant')
+
+    blobs = blob_dog(
+        im3,
+        min_sigma=[1.5, 3, 3],
+        max_sigma=[5, 10, 10],
+        sigma_ratio=1.2,
+        threshold=0.1
+    )
+    b = blobs[0]
+
+    assert b.shape == (6,)
+    assert b[0] == r / 2 + pad + 1
+    assert b[1] == r + pad + 1
+    assert b[2] == r + pad + 1
+    assert abs(math.sqrt(3) * b[3] - r / 2) < 1
+    assert abs(math.sqrt(3) * b[4] - r) < 1
+    assert abs(math.sqrt(3) * b[5] - r) < 1
+
+    # Testing exclude border
+
+    # image where blob is 5 px from borders, radius 5
+    img = np.ones((512, 512))
+    xs, ys = disk((5, 5), 5)
+    img[xs, ys] = 255
+
+
+def test_blob_dog_excl_border():
+    img = np.ones((512, 512))
+    xs, ys = disk((5, 5), 5)
+    img[xs, ys] = 255
+    blobs = blob_dog(
+        img,
+        min_sigma=1.5,
+        max_sigma=5,
+        sigma_ratio=1.2,
+    )
+    assert blobs.shape[0] == 1
+    b = blobs[0]
+    assert b[0] == b[1] == 5, "blob should be 5 px from x and y borders"
+
+    blobs = blob_dog(
+        img,
+        min_sigma=1.5,
+        max_sigma=5,
+        sigma_ratio=1.2,
+        exclude_border=6,
+    )
+    msg = "zero blobs should be detected, as only blob is 5 px from border"
+    assert blobs.shape[0] == 0, msg
+
+
+def test_blob_log():
+    r2 = math.sqrt(2)
+    img = np.ones((256, 256))
+
+    xs, ys = disk((200, 65), 5)
+    img[xs, ys] = 255
+
+    xs, ys = disk((80, 25), 15)
+    img[xs, ys] = 255
+
+    xs, ys = disk((50, 150), 25)
+    img[xs, ys] = 255
+
+    xs, ys = disk((100, 175), 30)
+    img[xs, ys] = 255
+
+    blobs = blob_log(img, min_sigma=5, max_sigma=20, threshold=1)
+
+    radius = lambda x: r2 * x[2]
+    s = sorted(blobs, key=radius)
+    thresh = 3
+
+    b = s[0]
+    assert abs(b[0] - 200) <= thresh
+    assert abs(b[1] - 65) <= thresh
+    assert abs(radius(b) - 5) <= thresh
+
+    b = s[1]
+    assert abs(b[0] - 80) <= thresh
+    assert abs(b[1] - 25) <= thresh
+    assert abs(radius(b) - 15) <= thresh
+
+    b = s[2]
+    assert abs(b[0] - 50) <= thresh
+    assert abs(b[1] - 150) <= thresh
+    assert abs(radius(b) - 25) <= thresh
+
+    b = s[3]
+    assert abs(b[0] - 100) <= thresh
+    assert abs(b[1] - 175) <= thresh
+    assert abs(radius(b) - 30) <= thresh
+
+    # Testing log scale
+    blobs = blob_log(
+        img,
+        min_sigma=5,
+        max_sigma=20,
+        threshold=1,
+        log_scale=True)
+
+    b = s[0]
+    assert abs(b[0] - 200) <= thresh
+    assert abs(b[1] - 65) <= thresh
+    assert abs(radius(b) - 5) <= thresh
+
+    b = s[1]
+    assert abs(b[0] - 80) <= thresh
+    assert abs(b[1] - 25) <= thresh
+    assert abs(radius(b) - 15) <= thresh
+
+    b = s[2]
+    assert abs(b[0] - 50) <= thresh
+    assert abs(b[1] - 150) <= thresh
+    assert abs(radius(b) - 25) <= thresh
+
+    b = s[3]
+    assert abs(b[0] - 100) <= thresh
+    assert abs(b[1] - 175) <= thresh
+    assert abs(radius(b) - 30) <= thresh
+
+    # Testing no peaks
+    img_empty = np.zeros((100,100))
+    assert blob_log(img_empty).size == 0
+
+
+def test_blob_log_3d():
+    # Testing 3D
+    r = 6
+    pad = 10
+    im3 = ellipsoid(r, r, r)
+    im3 = np.pad(im3, pad, mode='constant')
+
+    blobs = blob_log(im3, min_sigma=3, max_sigma=10)
+    b = blobs[0]
+
+    assert b.shape == (4,)
+    assert b[0] == r + pad + 1
+    assert b[1] == r + pad + 1
+    assert b[2] == r + pad + 1
+    assert abs(math.sqrt(3) * b[3] - r) < 1
+
+
+def test_blob_log_3d_anisotropic():
+    # Testing 3D anisotropic
+    r = 6
+    pad = 10
+    im3 = ellipsoid(r / 2, r, r)
+    im3 = np.pad(im3, pad, mode='constant')
+
+    blobs = blob_log(
+        im3,
+        min_sigma=[1, 2, 2],
+        max_sigma=[5, 10, 10],
+    )
+
+    b = blobs[0]
+    assert b.shape == (6,)
+    assert b[0] == r / 2 + pad + 1
+    assert b[1] == r + pad + 1
+    assert b[2] == r + pad + 1
+    assert abs(math.sqrt(3) * b[3] - r / 2) < 1
+    assert abs(math.sqrt(3) * b[4] - r) < 1
+    assert abs(math.sqrt(3) * b[5] - r) < 1
+
+
+def test_blob_log_exclude_border():
+    # image where blob is 5 px from borders, radius 5
+    img = np.ones((512, 512))
+    xs, ys = disk((5, 5), 5)
+    img[xs, ys] = 255
+
+    blobs = blob_log(
+        img,
+        min_sigma=1.5,
+        max_sigma=5,
+    )
+    assert blobs.shape[0] == 1
+    b = blobs[0]
+    assert b[0] == b[1] == 5, "blob should be 5 px from x and y borders"
+
+    blobs = blob_log(
+        img,
+        min_sigma=1.5,
+        max_sigma=5,
+        exclude_border=6,
+    )
+    msg = "zero blobs should be detected, as only blob is 5 px from border"
+    assert blobs.shape[0] == 0, msg
+
+
+def test_blob_doh():
+    img = np.ones((512, 512), dtype=np.uint8)
+
+    xs, ys = disk((400, 130), 20)
+    img[xs, ys] = 255
+
+    xs, ys = disk((460, 50), 30)
+    img[xs, ys] = 255
+
+    xs, ys = disk((100, 300), 40)
+    img[xs, ys] = 255
+
+    xs, ys = disk((200, 350), 50)
+    img[xs, ys] = 255
+
+    blobs = blob_doh(
+        img,
+        min_sigma=1,
+        max_sigma=60,
+        num_sigma=10,
+        threshold=.05)
+
+    radius = lambda x: x[2]
+    s = sorted(blobs, key=radius)
+    thresh = 4
+
+    b = s[0]
+    assert abs(b[0] - 400) <= thresh
+    assert abs(b[1] - 130) <= thresh
+    assert abs(radius(b) - 20) <= thresh
+
+    b = s[1]
+    assert abs(b[0] - 460) <= thresh
+    assert abs(b[1] - 50) <= thresh
+    assert abs(radius(b) - 30) <= thresh
+
+    b = s[2]
+    assert abs(b[0] - 100) <= thresh
+    assert abs(b[1] - 300) <= thresh
+    assert abs(radius(b) - 40) <= thresh
+
+    b = s[3]
+    assert abs(b[0] - 200) <= thresh
+    assert abs(b[1] - 350) <= thresh
+    assert abs(radius(b) - 50) <= thresh
+
+
+def test_blob_doh_log_scale():
+    img = np.ones((512, 512), dtype=np.uint8)
+
+    xs, ys = disk((400, 130), 20)
+    img[xs, ys] = 255
+
+    xs, ys = disk((460, 50), 30)
+    img[xs, ys] = 255
+
+    xs, ys = disk((100, 300), 40)
+    img[xs, ys] = 255
+
+    xs, ys = disk((200, 350), 50)
+    img[xs, ys] = 255
+
+    blobs = blob_doh(
+        img,
+        min_sigma=1,
+        max_sigma=60,
+        num_sigma=10,
+        log_scale=True,
+        threshold=.05)
+
+    radius = lambda x: x[2]
+    s = sorted(blobs, key=radius)
+    thresh = 10
+
+    b = s[0]
+    assert abs(b[0] - 400) <= thresh
+    assert abs(b[1] - 130) <= thresh
+    assert abs(radius(b) - 20) <= thresh
+
+    b = s[2]
+    assert abs(b[0] - 460) <= thresh
+    assert abs(b[1] - 50) <= thresh
+    assert abs(radius(b) - 30) <= thresh
+
+    b = s[1]
+    assert abs(b[0] - 100) <= thresh
+    assert abs(b[1] - 300) <= thresh
+    assert abs(radius(b) - 40) <= thresh
+
+    b = s[3]
+    assert abs(b[0] - 200) <= thresh
+    assert abs(b[1] - 350) <= thresh
+    assert abs(radius(b) - 50) <= thresh
+
+
+def test_blob_doh_no_peaks():
+    # Testing no peaks
+    img_empty = np.zeros((100,100))
+    assert blob_doh(img_empty).size == 0
+
+
+def test_blob_doh_overlap():
+    img = np.ones((256, 256), dtype=np.uint8)
+
+    xs, ys = disk((100, 100), 20)
+    img[xs, ys] = 255
+
+    xs, ys = disk((120, 100), 30)
+    img[xs, ys] = 255
+
+    blobs = blob_doh(
+        img,
+        min_sigma=1,
+        max_sigma=60,
+        num_sigma=10,
+        threshold=.05
+    )
+
+    assert len(blobs) == 1
+
+
+def test_blob_log_overlap_3d():
+    r1, r2 = 7, 6
+    pad1, pad2 = 11, 12
+    blob1 = ellipsoid(r1, r1, r1)
+    blob1 = np.pad(blob1, pad1, mode='constant')
+    blob2 = ellipsoid(r2, r2, r2)
+    blob2 = np.pad(blob2, [(pad2, pad2), (pad2 - 9, pad2 + 9),
+                           (pad2, pad2)],
+                   mode='constant')
+    im3 = np.logical_or(blob1, blob2)
+
+    blobs = blob_log(im3,  min_sigma=2, max_sigma=10, overlap=0.1)
+    assert len(blobs) == 1
+
+
+def test_blob_overlap_3d_anisotropic():
+    # Two spheres with distance between centers equal to radius
+    # One sphere is much smaller than the other so about half of it is within
+    # the bigger sphere.
+    s3 = math.sqrt(3)
+    overlap = _blob_overlap(np.array([0, 0,  0, 2 / s3, 10 / s3, 10 / s3]),
+                            np.array([0, 0, 10, 0.2 / s3, 1 / s3, 1 / s3]),
+                            sigma_dim=3)
+    assert_almost_equal(overlap, 0.48125)
+    overlap = _blob_overlap(np.array([0, 0, 0, 2 / s3, 10 / s3, 10 / s3]),
+                            np.array([2, 0, 0, 0.2 / s3, 1 / s3, 1 / s3]),
+                            sigma_dim=3)
+    assert_almost_equal(overlap, 0.48125)
+
+
+def test_blob_log_anisotropic():
+    image = np.zeros((50, 50))
+    image[20, 10:20] = 1
+    isotropic_blobs = blob_log(image, min_sigma=0.5, max_sigma=2, num_sigma=3)
+    assert len(isotropic_blobs) > 1  # many small blobs found in line
+    ani_blobs = blob_log(image, min_sigma=[0.5, 5], max_sigma=[2, 20],
+                         num_sigma=3)  # 10x anisotropy, line is 1x10
+    assert len(ani_blobs) == 1  # single anisotropic blob found
+
+
+def test_blob_log_overlap_3d_anisotropic():
+    r1, r2 = 7, 6
+    pad1, pad2 = 11, 12
+    blob1 = ellipsoid(r1, r1, r1)
+    blob1 = np.pad(blob1, pad1, mode='constant')
+    blob2 = ellipsoid(r2, r2, r2)
+    blob2 = np.pad(blob2, [(pad2, pad2), (pad2 - 9, pad2 + 9),
+                           (pad2, pad2)],
+                   mode='constant')
+    im3 = np.logical_or(blob1, blob2)
+
+    blobs = blob_log(im3, min_sigma=[2, 2.01, 2.005],
+                     max_sigma=10, overlap=0.1)
+    assert len(blobs) == 1
+
+    # Two circles with distance between centers equal to radius
+    overlap = _blob_overlap(np.array([0, 0, 10 / math.sqrt(2)]),
+                            np.array([0, 10, 10 / math.sqrt(2)]))
+    assert_almost_equal(overlap,
+                        1./math.pi * (2 * math.acos(1./2) - math.sqrt(3)/2.))
+
+
+def test_no_blob():
+    im = np.zeros((10, 10))
+    blobs = blob_log(im,  min_sigma=2, max_sigma=5, num_sigma=4)
+    assert len(blobs) == 0

venv/Lib/site-packages/skimage/feature/tests/test_brief.py

@@ -0,0 +1,80 @@
+import pytest
+import numpy as np
+
+from skimage._shared.testing import assert_array_equal
+from skimage import data
+from skimage.feature import BRIEF, corner_peaks, corner_harris
+from skimage._shared import testing
+
+
+def test_color_image_unsupported_error():
+    """Brief descriptors can be evaluated on gray-scale images only."""
+    img = np.zeros((20, 20, 3))
+    keypoints = np.asarray([[7, 5], [11, 13]])
+    with testing.raises(ValueError):
+        BRIEF().extract(img, keypoints)
+
+
+@pytest.mark.parametrize('dtype', ['float32', 'float64', 'uint8', 'int'])
+def test_normal_mode(dtype):
+    """Verify the computed BRIEF descriptors with expected for normal mode."""
+    img = data.coins().astype(dtype)
+
+    keypoints = corner_peaks(corner_harris(img), min_distance=5,
+                             threshold_abs=0, threshold_rel=0.1)
+
+    extractor = BRIEF(descriptor_size=8, sigma=2)
+
+    extractor.extract(img, keypoints[:8])
+
+    expected = np.array([[1, 0, 1, 0, 0, 1, 0, 1],
+                         [1, 1, 1, 0, 1, 0, 1, 1],
+                         [1, 0, 1, 0, 0, 1, 0, 1],
+                         [0, 1, 0, 0, 1, 0, 1, 0],
+                         [1, 1, 1, 0, 0, 0, 1, 1],
+                         [1, 1, 1, 0, 1, 1, 1, 1],
+                         [1, 0, 1, 0, 0, 1, 0, 1],
+                         [0, 0, 0, 0, 0, 1, 0, 0]], dtype=bool)
+
+    assert_array_equal(extractor.descriptors, expected)
+
+
+@pytest.mark.parametrize('dtype', ['float32', 'float64', 'uint8', 'int'])
+def test_uniform_mode(dtype):
+    """Verify the computed BRIEF descriptors with expected for uniform mode."""
+    img = data.coins().astype(dtype)
+
+    keypoints = corner_peaks(corner_harris(img), min_distance=5,
+                             threshold_abs=0, threshold_rel=0.1)
+
+    extractor = BRIEF(descriptor_size=8, sigma=2, mode='uniform')
+
+    extractor.extract(img, keypoints[:8])
+
+    expected = np.array([[1, 1, 0, 0, 0, 0, 0, 0],
+                         [1, 1, 1, 0, 0, 1, 0, 0],
+                         [1, 1, 0, 0, 1, 0, 0, 0],
+                         [0, 0, 0, 1, 1, 1, 1, 1],
+                         [1, 1, 1, 0, 0, 1, 0, 0],
+                         [1, 1, 1, 1, 0, 1, 0, 0],
+                         [1, 1, 0, 0, 0, 1, 0, 0],
+                         [0, 1, 1, 1, 0, 1, 1, 1]], dtype=bool)
+
+    assert_array_equal(extractor.descriptors, expected)
+
+
+def test_unsupported_mode():
+    with testing.raises(ValueError):
+        BRIEF(mode='foobar')
+
+
+@pytest.mark.parametrize('dtype', ['float32', 'float64', 'uint8', 'int'])
+def test_border(dtype):
+    img = np.zeros((100, 100), dtype=dtype)
+    keypoints = np.array([[1, 1], [20, 20], [50, 50], [80, 80]])
+
+    extractor = BRIEF(patch_size=41)
+    extractor.extract(img, keypoints)
+
+    assert extractor.descriptors.shape[0] == 3
+    assert_array_equal(extractor.mask, (False, True, True, True))

venv/Lib/site-packages/skimage/feature/tests/test_canny.py

@@ -0,0 +1,121 @@
+import unittest
+import numpy as np
+from skimage._shared.testing import assert_equal
+from scipy.ndimage import binary_dilation, binary_erosion
+import skimage.feature as F
+from skimage import data, img_as_float
+
+
+class TestCanny(unittest.TestCase):
+    def test_00_00_zeros(self):
+        '''Test that the Canny filter finds no points for a blank field'''
+        result = F.canny(np.zeros((20, 20)), 4, 0, 0, np.ones((20, 20), bool))
+        self.assertFalse(np.any(result))
+
+    def test_00_01_zeros_mask(self):
+        '''Test that the Canny filter finds no points in a masked image'''
+        result = (F.canny(np.random.uniform(size=(20, 20)), 4, 0, 0,
+                          np.zeros((20, 20), bool)))
+        self.assertFalse(np.any(result))
+
+    def test_01_01_circle(self):
+        '''Test that the Canny filter finds the outlines of a circle'''
+        i, j = np.mgrid[-200:200, -200:200].astype(float) / 200
+        c = np.abs(np.sqrt(i * i + j * j) - .5) < .02
+        result = F.canny(c.astype(float), 4, 0, 0, np.ones(c.shape, bool))
+        #
+        # erode and dilate the circle to get rings that should contain the
+        # outlines
+        #
+        cd = binary_dilation(c, iterations=3)
+        ce = binary_erosion(c, iterations=3)
+        cde = np.logical_and(cd, np.logical_not(ce))
+        self.assertTrue(np.all(cde[result]))
+        #
+        # The circle has a radius of 100. There are two rings here, one
+        # for the inside edge and one for the outside. So that's
+        # 100 * 2 * 2 * 3 for those places where pi is still 3.
+        # The edge contains both pixels if there's a tie, so we
+        # bump the count a little.
+        point_count = np.sum(result)
+        self.assertTrue(point_count > 1200)
+        self.assertTrue(point_count < 1600)
+
+    def test_01_02_circle_with_noise(self):
+        '''Test that the Canny filter finds the circle outlines
+         in a noisy image'''
+        np.random.seed(0)
+        i, j = np.mgrid[-200:200, -200:200].astype(float) / 200
+        c = np.abs(np.sqrt(i * i + j * j) - .5) < .02
+        cf = c.astype(float) * .5 + np.random.uniform(size=c.shape) * .5
+        result = F.canny(cf, 4, .1, .2, np.ones(c.shape, bool))
+        #
+        # erode and dilate the circle to get rings that should contain the
+        # outlines
+        #
+        cd = binary_dilation(c, iterations=4)
+        ce = binary_erosion(c, iterations=4)
+        cde = np.logical_and(cd, np.logical_not(ce))
+        self.assertTrue(np.all(cde[result]))
+        point_count = np.sum(result)
+        self.assertTrue(point_count > 1200)
+        self.assertTrue(point_count < 1600)
+
+    def test_image_shape(self):
+        self.assertRaises(ValueError, F.canny, np.zeros((20, 20, 20)), 4, 0, 0)
+
+    def test_mask_none(self):
+        result1 = F.canny(np.zeros((20, 20)), 4, 0, 0, np.ones((20, 20), bool))
+        result2 = F.canny(np.zeros((20, 20)), 4, 0, 0)
+        self.assertTrue(np.all(result1 == result2))
+
+    def test_use_quantiles(self):
+        image = img_as_float(data.camera()[::50, ::50])
+
+        # Correct output produced manually with quantiles
+        # of 0.8 and 0.6 for high and low respectively
+        correct_output = np.array([[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+           [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+           [0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0],
+           [0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0],
+           [0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0],
+           [0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0],
+           [0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0],
+           [0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0],
+           [0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0],
+           [0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0],
+           [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]], dtype=bool)
+
+        result = F.canny(image, low_threshold=0.6, high_threshold=0.8, use_quantiles=True)
+
+        assert_equal(result, correct_output)
+
+    def test_invalid_use_quantiles(self):
+        image = img_as_float(data.camera()[::50, ::50])
+
+        self.assertRaises(ValueError, F.canny, image, use_quantiles=True,
+                          low_threshold=0.5, high_threshold=3.6)
+
+        self.assertRaises(ValueError, F.canny, image, use_quantiles=True,
+                          low_threshold=-5, high_threshold=0.5)
+
+        self.assertRaises(ValueError, F.canny, image, use_quantiles=True,
+                          low_threshold=99, high_threshold=0.9)
+
+        self.assertRaises(ValueError, F.canny, image, use_quantiles=True,
+                          low_threshold=0.5, high_threshold=-100)
+
+        # Example from issue #4282
+        image = data.camera()
+        self.assertRaises(ValueError, F.canny, image, use_quantiles=True,
+                          low_threshold=50, high_threshold=150)
+
+    def test_dtype(self):
+        """Check that the same output is produced regardless of image dtype."""
+        image_uint8 = data.camera()
+        image_float = img_as_float(image_uint8)
+
+        result_uint8 = F.canny(image_uint8)
+        result_float = F.canny(image_float)
+
+        assert_equal(result_uint8, result_float)

venv/Lib/site-packages/skimage/feature/tests/test_cascade.py

@@ -0,0 +1,23 @@
+import numpy as np
+
+import skimage.data as data
+from skimage.feature import Cascade
+
+
+def test_detector_astronaut():
+
+    # Load the trained file from the module root.
+    trained_file = data.lbp_frontal_face_cascade_filename()
+
+    # Initialize the detector cascade.
+    detector = Cascade(trained_file)
+
+    img = data.astronaut()
+
+    detected = detector.detect_multi_scale(img=img,
+                                           scale_factor=1.2,
+                                           step_ratio=1,
+                                           min_size=(60, 60),
+                                           max_size=(123, 123))
+
+    assert len(detected) == 1, 'One face should be detected.'

venv/Lib/site-packages/skimage/feature/tests/test_censure.py

@@ -0,0 +1,105 @@
+import numpy as np
+from skimage._shared.testing import assert_array_equal
+from skimage.data import moon
+from skimage.feature import CENSURE
+from skimage._shared.testing import test_parallel
+from skimage._shared import testing
+from skimage.transform import rescale
+
+
+img = moon()
+np.random.seed(0)
+
+
+def test_censure_on_rectangular_images():
+    """Censure feature detector should work on 2D image of any shape."""
+    rect_image = np.random.rand(300, 200)
+    square_image = np.random.rand(200, 200)
+    CENSURE().detect((square_image))
+    CENSURE().detect((rect_image))
+
+
+def test_keypoints_censure_color_image_unsupported_error():
+    """Censure keypoints can be extracted from gray-scale images only."""
+    with testing.raises(ValueError):
+        CENSURE().detect(np.zeros((20, 20, 3)))
+
+
+def test_keypoints_censure_mode_validity_error():
+    """Mode argument in keypoints_censure can be either DoB, Octagon or
+    STAR."""
+    with testing.raises(ValueError):
+        CENSURE(mode='dummy')
+
+
+def test_keypoints_censure_scale_range_error():
+    """Difference between the the max_scale and min_scale parameters in
+    keypoints_censure should be greater than or equal to two."""
+    with testing.raises(ValueError):
+        CENSURE(min_scale=1, max_scale=2)
+
+
+def test_keypoints_censure_moon_image_dob():
+    """Verify the actual Censure keypoints and their corresponding scale with
+    the expected values for DoB filter."""
+    detector = CENSURE()
+    detector.detect(img)
+    expected_keypoints = np.array([[ 21, 497],
+                                   [ 36,  46],
+                                   [119, 350],
+                                   [185, 177],
+                                   [287, 250],
+                                   [357, 239],
+                                   [463, 116],
+                                   [464, 132],
+                                   [467, 260]])
+    expected_scales = np.array([3, 4, 4, 2, 2, 3, 2, 2, 2])
+
+    assert_array_equal(expected_keypoints, detector.keypoints)
+    assert_array_equal(expected_scales, detector.scales)
+
+
+@test_parallel()
+def test_keypoints_censure_moon_image_octagon():
+    """Verify the actual Censure keypoints and their corresponding scale with
+    the expected values for Octagon filter."""
+
+    detector = CENSURE(mode='octagon')
+    # quarter scale image for speed
+    detector.detect(rescale(img, 0.25,
+                            multichannel=False,
+                            anti_aliasing=False,
+                            mode='constant'))
+    expected_keypoints = np.array([[ 23,  27],
+                                   [ 29,  89],
+                                   [ 31,  87],
+                                   [106,  59],
+                                   [111,  67]])
+
+    expected_scales = np.array([3, 2, 5, 2, 4])
+
+    assert_array_equal(expected_keypoints, detector.keypoints)
+    assert_array_equal(expected_scales, detector.scales)
+
+
+def test_keypoints_censure_moon_image_star():
+    """Verify the actual Censure keypoints and their corresponding scale with
+    the expected values for STAR filter."""
+    detector = CENSURE(mode='star')
+    # quarter scale image for speed
+    detector.detect(rescale(img, 0.25,
+                            multichannel=False,
+                            anti_aliasing=False,
+                            mode='constant'))
+    expected_keypoints = np.array([[ 23,  27],
+                                   [ 29,  89],
+                                   [ 30,  86],
+                                   [107,  59],
+                                   [109,  64],
+                                   [111,  67],
+                                   [113,  70]])
+
+    expected_scales = np.array([3, 2, 4, 2, 5, 3, 2])
+
+    assert_array_equal(expected_keypoints, detector.keypoints)
+    assert_array_equal(expected_scales, detector.scales)

venv/Lib/site-packages/skimage/feature/tests/test_corner.py

@@ -0,0 +1,493 @@
+import numpy as np
+from skimage._shared.testing import assert_array_equal, assert_almost_equal
+from skimage import data
+from skimage import img_as_float
+from skimage import draw
+from skimage.color import rgb2gray
+from skimage.morphology import octagon
+from skimage._shared.testing import test_parallel
+from skimage._shared._warnings import expected_warnings
+from skimage._shared import testing
+import pytest
+
+from skimage.feature import (corner_moravec, corner_harris, corner_shi_tomasi,
+                             corner_subpix, peak_local_max, corner_peaks,
+                             corner_kitchen_rosenfeld, corner_foerstner,
+                             corner_fast, corner_orientations,
+                             structure_tensor, structure_tensor_eigvals,
+                             hessian_matrix, hessian_matrix_eigvals,
+                             hessian_matrix_det, shape_index)
+
+
+@pytest.fixture
+def im3d():
+    r = 10
+    pad = 10
+    im3 = draw.ellipsoid(r, r, r)
+    im3 = np.pad(im3, pad, mode='constant').astype(np.uint8)
+    return im3
+
+
+def test_structure_tensor():
+    square = np.zeros((5, 5))
+    square[2, 2] = 1
+    Axx, Axy, Ayy = structure_tensor(square, sigma=0.1)
+    assert_array_equal(Axx, np.array([[ 0,  0,  0,  0,  0],
+                                      [ 0,  1,  0,  1,  0],
+                                      [ 0,  4,  0,  4,  0],
+                                      [ 0,  1,  0,  1,  0],
+                                      [ 0,  0,  0,  0,  0]]))
+    assert_array_equal(Axy, np.array([[ 0,  0,  0,  0,  0],
+                                      [ 0,  1,  0, -1,  0],
+                                      [ 0,  0,  0, -0,  0],
+                                      [ 0, -1, -0,  1,  0],
+                                      [ 0,  0,  0,  0,  0]]))
+    assert_array_equal(Ayy, np.array([[ 0,  0,  0,  0,  0],
+                                      [ 0,  1,  4,  1,  0],
+                                      [ 0,  0,  0,  0,  0],
+                                      [ 0,  1,  4,  1,  0],
+                                      [ 0,  0,  0,  0,  0]]))
+
+
+def test_hessian_matrix():
+    square = np.zeros((5, 5))
+    square[2, 2] = 4
+    Hrr, Hrc, Hcc = hessian_matrix(square, sigma=0.1, order='rc')
+    assert_almost_equal(Hrr, np.array([[0, 0,  0, 0, 0],
+                                       [0, 0,  0, 0, 0],
+                                       [2, 0, -2, 0, 2],
+                                       [0, 0,  0, 0, 0],
+                                       [0, 0,  0, 0, 0]]))
+
+    assert_almost_equal(Hrc, np.array([[0,  0, 0,  0, 0],
+                                       [0,  1, 0, -1, 0],
+                                       [0,  0, 0,  0, 0],
+                                       [0, -1, 0,  1, 0],
+                                       [0,  0, 0,  0, 0]]))
+
+    assert_almost_equal(Hcc, np.array([[0, 0,  2, 0, 0],
+                                       [0, 0,  0, 0, 0],
+                                       [0, 0, -2, 0, 0],
+                                       [0, 0,  0, 0, 0],
+                                       [0, 0,  2, 0, 0]]))
+
+
+def test_hessian_matrix_3d():
+    cube = np.zeros((5, 5, 5))
+    cube[2, 2, 2] = 4
+    Hs = hessian_matrix(cube, sigma=0.1, order='rc')
+    assert len(Hs) == 6, ("incorrect number of Hessian images (%i) for 3D" %
+                          len(Hs))
+    assert_almost_equal(Hs[2][:, 2, :], np.array([[0,  0,  0,  0,  0],
+                                                  [0,  1,  0, -1,  0],
+                                                  [0,  0,  0,  0,  0],
+                                                  [0, -1,  0,  1,  0],
+                                                  [0,  0,  0,  0,  0]]))
+
+
+def test_structure_tensor_eigvals():
+    square = np.zeros((5, 5))
+    square[2, 2] = 1
+    Axx, Axy, Ayy = structure_tensor(square, sigma=0.1)
+    l1, l2 = structure_tensor_eigvals(Axx, Axy, Ayy)
+    assert_array_equal(l1, np.array([[0, 0, 0, 0, 0],
+                                     [0, 2, 4, 2, 0],
+                                     [0, 4, 0, 4, 0],
+                                     [0, 2, 4, 2, 0],
+                                     [0, 0, 0, 0, 0]]))
+    assert_array_equal(l2, np.array([[0, 0, 0, 0, 0],
+                                     [0, 0, 0, 0, 0],
+                                     [0, 0, 0, 0, 0],
+                                     [0, 0, 0, 0, 0],
+                                     [0, 0, 0, 0, 0]]))
+
+
+def test_hessian_matrix_eigvals():
+    square = np.zeros((5, 5))
+    square[2, 2] = 4
+    H = hessian_matrix(square, sigma=0.1, order='rc')
+    l1, l2 = hessian_matrix_eigvals(H)
+    assert_almost_equal(l1, np.array([[0, 0,  2, 0, 0],
+                                      [0, 1,  0, 1, 0],
+                                      [2, 0, -2, 0, 2],
+                                      [0, 1,  0, 1, 0],
+                                      [0, 0,  2, 0, 0]]))
+    assert_almost_equal(l2, np.array([[0,  0,  0,  0, 0],
+                                      [0, -1,  0, -1, 0],
+                                      [0,  0, -2,  0, 0],
+                                      [0, -1,  0, -1, 0],
+                                      [0,  0,  0,  0, 0]]))
+
+
+def test_hessian_matrix_eigvals_3d(im3d):
+    H = hessian_matrix(im3d)
+    E = hessian_matrix_eigvals(H)
+    # test descending order:
+    e0, e1, e2 = E
+    assert np.all(e0 >= e1) and np.all(e1 >= e2)
+
+    E0, E1, E2 = E[:, E.shape[1] // 2]  # cross section
+    row_center, col_center = np.array(E0.shape) // 2
+    circles = [draw.circle_perimeter(row_center, col_center, radius,
+                                     shape=E0.shape)
+               for radius in range(1, E0.shape[1] // 2 - 1)]
+    response0 = np.array([np.mean(E0[c]) for c in circles])
+    response2 = np.array([np.mean(E2[c]) for c in circles])
+    # eigenvalues are negative just inside the sphere, positive just outside
+    assert np.argmin(response2) < np.argmax(response0)
+    assert np.min(response2) < 0
+    assert np.max(response0) > 0
+
+
+@test_parallel()
+def test_hessian_matrix_det():
+    image = np.zeros((5, 5))
+    image[2, 2] = 1
+    det = hessian_matrix_det(image, 5)
+    assert_almost_equal(det, 0, decimal=3)
+
+
+def test_hessian_matrix_det_3d(im3d):
+    D = hessian_matrix_det(im3d)
+    D0 = D[D.shape[0] // 2]
+    row_center, col_center = np.array(D0.shape) // 2
+    # testing in 3D is hard. We test this by showing that you get the
+    # expected flat-then-low-then-high 2nd derivative response in a circle
+    # around the midplane of the sphere.
+    circles = [draw.circle_perimeter(row_center, col_center, r, shape=D0.shape)
+               for r in range(1, D0.shape[1] // 2 - 1)]
+    response = np.array([np.mean(D0[c]) for c in circles])
+    lowest = np.argmin(response)
+    highest = np.argmax(response)
+    assert lowest < highest
+    assert response[lowest] < 0
+    assert response[highest] > 0
+
+
+def test_shape_index():
+    # software floating point arm doesn't raise a warning on divide by zero
+    # https://github.com/scikit-image/scikit-image/issues/3335
+    square = np.zeros((5, 5))
+    square[2, 2] = 4
+    with expected_warnings([r'divide by zero|\A\Z', r'invalid value|\A\Z']):
+        s = shape_index(square, sigma=0.1)
+    assert_almost_equal(
+        s, np.array([[ np.nan, np.nan,   -0.5, np.nan, np.nan],
+                     [ np.nan,      0, np.nan,      0, np.nan],
+                     [   -0.5, np.nan,     -1, np.nan,   -0.5],
+                     [ np.nan,      0, np.nan,      0, np.nan],
+                     [ np.nan, np.nan,   -0.5, np.nan, np.nan]])
+    )
+
+
+@test_parallel()
+def test_square_image():
+    im = np.zeros((50, 50)).astype(float)
+    im[:25, :25] = 1.
+
+    # Moravec
+    results = peak_local_max(corner_moravec(im),
+                             min_distance=10, threshold_rel=0)
+    # interest points along edge
+    assert len(results) == 57
+
+    # Harris
+    results = peak_local_max(corner_harris(im, method='k'),
+                             min_distance=10, threshold_rel=0)
+    # interest at corner
+    assert len(results) == 1
+
+    results = peak_local_max(corner_harris(im, method='eps'),
+                             min_distance=10, threshold_rel=0)
+    # interest at corner
+    assert len(results) == 1
+
+    # Shi-Tomasi
+    results = peak_local_max(corner_shi_tomasi(im),
+                             min_distance=10, threshold_rel=0)
+    # interest at corner
+    assert len(results) == 1
+
+
+def test_noisy_square_image():
+    im = np.zeros((50, 50)).astype(float)
+    im[:25, :25] = 1.
+    np.random.seed(seed=1234)
+    im = im + np.random.uniform(size=im.shape) * .2
+
+    # Moravec
+    results = peak_local_max(corner_moravec(im),
+                             min_distance=10, threshold_rel=0)
+    # undefined number of interest points
+    assert results.any()
+
+    # Harris
+    results = peak_local_max(corner_harris(im, method='k'),
+                             min_distance=10, threshold_rel=0)
+    assert len(results) == 1
+    results = peak_local_max(corner_harris(im, method='eps'),
+                             min_distance=10, threshold_rel=0)
+    assert len(results) == 1
+
+    # Shi-Tomasi
+    results = peak_local_max(corner_shi_tomasi(im, sigma=1.5),
+                             min_distance=10, threshold_rel=0)
+    assert len(results) == 1
+
+
+def test_squared_dot():
+    im = np.zeros((50, 50))
+    im[4:8, 4:8] = 1
+    im = img_as_float(im)
+
+    # Moravec fails
+
+    # Harris
+    results = peak_local_max(corner_harris(im),
+                             min_distance=10, threshold_rel=0)
+    assert (results == np.array([[6, 6]])).all()
+
+    # Shi-Tomasi
+    results = peak_local_max(corner_shi_tomasi(im),
+                             min_distance=10, threshold_rel=0)
+    assert (results == np.array([[6, 6]])).all()
+
+
+def test_rotated_img():
+    """
+    The harris filter should yield the same results with an image and it's
+    rotation.
+    """
+    im = img_as_float(data.astronaut().mean(axis=2))
+    im_rotated = im.T
+
+    # Moravec
+    results = peak_local_max(corner_moravec(im),
+                             min_distance=10, threshold_rel=0)
+    results_rotated = peak_local_max(corner_moravec(im_rotated),
+                                     min_distance=10, threshold_rel=0)
+    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
+    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()
+
+    # Harris
+    results = peak_local_max(corner_harris(im),
+                             min_distance=10, threshold_rel=0)
+    results_rotated = peak_local_max(corner_harris(im_rotated),
+                                     min_distance=10, threshold_rel=0)
+    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
+    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()
+
+    # Shi-Tomasi
+    results = peak_local_max(corner_shi_tomasi(im),
+                             min_distance=10, threshold_rel=0)
+    results_rotated = peak_local_max(corner_shi_tomasi(im_rotated),
+                                     min_distance=10, threshold_rel=0)
+    assert (np.sort(results[:, 0]) == np.sort(results_rotated[:, 1])).all()
+    assert (np.sort(results[:, 1]) == np.sort(results_rotated[:, 0])).all()
+
+
+def test_subpix_edge():
+    img = np.zeros((50, 50))
+    img[:25, :25] = 255
+    img[25:, 25:] = 255
+    corner = peak_local_max(corner_harris(img),
+                            min_distance=10, threshold_rel=0, num_peaks=1)
+    subpix = corner_subpix(img, corner)
+    assert_array_equal(subpix[0], (24.5, 24.5))
+
+
+def test_subpix_dot():
+    img = np.zeros((50, 50))
+    img[25, 25] = 255
+    corner = peak_local_max(corner_harris(img),
+                            min_distance=10, threshold_rel=0, num_peaks=1)
+    subpix = corner_subpix(img, corner)
+    assert_array_equal(subpix[0], (25, 25))
+
+
+def test_subpix_no_class():
+    img = np.zeros((50, 50))
+    subpix = corner_subpix(img, np.array([[25, 25]]))
+    assert_array_equal(subpix[0], (np.nan, np.nan))
+
+    img[25, 25] = 1e-10
+    corner = peak_local_max(corner_harris(img),
+                            min_distance=10, threshold_rel=0, num_peaks=1)
+    subpix = corner_subpix(img, np.array([[25, 25]]))
+    assert_array_equal(subpix[0], (np.nan, np.nan))
+
+
+def test_subpix_border():
+    img = np.zeros((50, 50))
+    img[1:25, 1:25] = 255
+    img[25:-1, 25:-1] = 255
+    corner = corner_peaks(corner_harris(img), threshold_rel=0)
+    subpix = corner_subpix(img, corner, window_size=11)
+    ref = np.array([[24.5, 24.5],
+                    [0.52040816, 0.52040816],
+                    [0.52040816, 24.47959184],
+                    [24.47959184, 0.52040816],
+                    [24.52040816, 48.47959184],
+                    [48.47959184, 24.52040816],
+                    [48.47959184, 48.47959184]])
+
+    assert_almost_equal(subpix, ref)
+
+
+def test_num_peaks():
+    """For a bunch of different values of num_peaks, check that
+    peak_local_max returns exactly the right amount of peaks. Test
+    is run on the astronaut image in order to produce a sufficient number of corners"""
+
+    img_corners = corner_harris(rgb2gray(data.astronaut()))
+
+    for i in range(20):
+        n = np.random.randint(1, 21)
+        results = peak_local_max(img_corners,
+                                 min_distance=10, threshold_rel=0, num_peaks=n)
+        assert (results.shape[0] == n)
+
+
+def test_corner_peaks():
+    response = np.zeros((10, 10))
+    response[2:5, 2:5] = 1
+    response[8:10, 0:2] = 1
+
+    corners = corner_peaks(response, exclude_border=False, min_distance=10,
+                           threshold_rel=0)
+    assert corners.shape == (1, 2)
+
+    corners = corner_peaks(response, exclude_border=False, min_distance=5,
+                           threshold_rel=0)
+    assert corners.shape == (2, 2)
+
+    with pytest.warns(FutureWarning,
+                      match="Until version 0.16, threshold_rel.*"):
+        corners = corner_peaks(response, exclude_border=False, min_distance=1)
+        assert corners.shape == (5, 2)
+
+        corners = corner_peaks(response, exclude_border=False, min_distance=1,
+                               indices=False)
+        assert np.sum(corners) == 5
+
+
+def test_blank_image_nans():
+    """Some of the corner detectors had a weakness in terms of returning
+    NaN when presented with regions of constant intensity. This should
+    be fixed by now. We test whether each detector returns something
+    finite in the case of constant input"""
+
+    detectors = [corner_moravec, corner_harris, corner_shi_tomasi,
+                 corner_kitchen_rosenfeld, corner_foerstner]
+    constant_image = np.zeros((20, 20))
+
+    for det in detectors:
+        response = det(constant_image)
+        assert np.all(np.isfinite(response))
+
+
+def test_corner_fast_image_unsupported_error():
+    img = np.zeros((20, 20, 3))
+    with testing.raises(ValueError):
+        corner_fast(img)
+
+
+@test_parallel()
+def test_corner_fast_astronaut():
+    img = rgb2gray(data.astronaut())
+    expected = np.array([[444, 310],
+                         [374, 171],
+                         [249, 171],
+                         [492, 139],
+                         [403, 162],
+                         [496, 266],
+                         [362, 328],
+                         [476, 250],
+                         [353, 172],
+                         [346, 279],
+                         [494, 169],
+                         [177, 156],
+                         [413, 181],
+                         [213, 117],
+                         [390, 149],
+                         [140, 205],
+                         [232, 266],
+                         [489, 155],
+                         [387, 195],
+                         [101, 198],
+                         [363, 192],
+                         [364, 147],
+                         [300, 244],
+                         [325, 245],
+                         [141, 242],
+                         [401, 197],
+                         [197, 148],
+                         [339, 242],
+                         [188, 113],
+                         [362, 252],
+                         [379, 183],
+                         [358, 307],
+                         [245, 137],
+                         [369, 159],
+                         [464, 251],
+                         [305,  57],
+                         [223, 375]])
+    actual = corner_peaks(corner_fast(img, 12, 0.3),
+                          min_distance=10, threshold_rel=0)
+    assert_array_equal(actual, expected)
+
+
+def test_corner_orientations_image_unsupported_error():
+    img = np.zeros((20, 20, 3))
+    with testing.raises(ValueError):
+        corner_orientations(
+            img,
+            np.asarray([[7, 7]]), np.ones((3, 3)))
+
+
+def test_corner_orientations_even_shape_error():
+    img = np.zeros((20, 20))
+    with testing.raises(ValueError):
+        corner_orientations(
+            img,
+            np.asarray([[7, 7]]), np.ones((4, 4)))
+
+
+@test_parallel()
+def test_corner_orientations_astronaut():
+    img = rgb2gray(data.astronaut())
+    corners = corner_peaks(corner_fast(img, 11, 0.35),
+                           min_distance=10, threshold_abs=0, threshold_rel=0.1)
+    expected = np.array([-4.40598471e-01, -1.46554357e+00,
+                         2.39291733e+00, -1.63869275e+00,
+                         1.45931342e+00, -1.64397304e+00,
+                         -1.76069982e+00, 1.09650167e+00,
+                         -1.65449964e+00, 1.19134149e+00,
+                         5.46905279e-02, 2.17103132e+00,
+                         8.12701702e-01, -1.22091334e-01,
+                         -2.01162417e+00, 1.25854853e+00,
+                         3.05330950e+00, 2.01197383e+00,
+                         1.07812134e+00, 3.09780364e+00,
+                         -3.49561988e-01, 2.43573659e+00,
+                         3.14918803e-01, -9.88548213e-01,
+                         -1.88247204e-01, 2.47305654e+00,
+                         -2.99143370e+00, 1.47154532e+00,
+                         -6.61151410e-01, -1.68885773e+00,
+                         -3.09279990e-01, -2.81524886e+00,
+                         -1.75220190e+00, -1.69230287e+00,
+                         -7.52950306e-04])
+
+    actual = corner_orientations(img, corners, octagon(3, 2))
+    assert_almost_equal(actual, expected)
+
+
+def test_corner_orientations_square():
+    square = np.zeros((12, 12))
+    square[3:9, 3:9] = 1
+    corners = corner_peaks(corner_fast(square, 9),
+                           min_distance=1, threshold_rel=0)
+    actual_orientations = corner_orientations(square, corners, octagon(3, 2))
+    actual_orientations_degrees = np.rad2deg(actual_orientations)
+    expected_orientations_degree = np.array([45, 135, -45, -135])
+    assert_array_equal(actual_orientations_degrees,
+                       expected_orientations_degree)

venv/Lib/site-packages/skimage/feature/tests/test_daisy.py

@@ -0,0 +1,102 @@
+import numpy as np
+from skimage._shared.testing import assert_almost_equal
+from numpy import sqrt, ceil
+
+from skimage import data
+from skimage import img_as_float
+from skimage.feature import daisy
+from skimage._shared import testing
+
+
+def test_daisy_color_image_unsupported_error():
+    img = np.zeros((20, 20, 3))
+    with testing.raises(ValueError):
+        daisy(img)
+
+
+def test_daisy_desc_dims():
+    img = img_as_float(data.astronaut()[:128, :128].mean(axis=2))
+    rings = 2
+    histograms = 4
+    orientations = 3
+    descs = daisy(img, rings=rings, histograms=histograms,
+                  orientations=orientations)
+    assert(descs.shape[2] == (rings * histograms + 1) * orientations)
+
+    rings = 4
+    histograms = 5
+    orientations = 13
+    descs = daisy(img, rings=rings, histograms=histograms,
+                  orientations=orientations)
+    assert(descs.shape[2] == (rings * histograms + 1) * orientations)
+
+
+def test_descs_shape():
+    img = img_as_float(data.astronaut()[:256, :256].mean(axis=2))
+    radius = 20
+    step = 8
+    descs = daisy(img, radius=radius, step=step)
+    assert(descs.shape[0] == ceil((img.shape[0] - radius * 2) / float(step)))
+    assert(descs.shape[1] == ceil((img.shape[1] - radius * 2) / float(step)))
+
+    img = img[:-1, :-2]
+    radius = 5
+    step = 3
+    descs = daisy(img, radius=radius, step=step)
+    assert(descs.shape[0] == ceil((img.shape[0] - radius * 2) / float(step)))
+    assert(descs.shape[1] == ceil((img.shape[1] - radius * 2) / float(step)))
+
+
+def test_daisy_sigmas_and_radii():
+    img = img_as_float(data.astronaut()[:64, :64].mean(axis=2))
+    sigmas = [1, 2, 3]
+    radii = [1, 2]
+    daisy(img, sigmas=sigmas, ring_radii=radii)
+
+
+def test_daisy_incompatible_sigmas_and_radii():
+    img = img_as_float(data.astronaut()[:64, :64].mean(axis=2))
+    sigmas = [1, 2]
+    radii = [1, 2]
+    with testing.raises(ValueError):
+        daisy(img, sigmas=sigmas, ring_radii=radii)
+
+
+def test_daisy_normalization():
+    img = img_as_float(data.astronaut()[:64, :64].mean(axis=2))
+
+    descs = daisy(img, normalization='l1')
+    for i in range(descs.shape[0]):
+        for j in range(descs.shape[1]):
+            assert_almost_equal(np.sum(descs[i, j, :]), 1)
+    descs_ = daisy(img)
+    assert_almost_equal(descs, descs_)
+
+    descs = daisy(img, normalization='l2')
+    for i in range(descs.shape[0]):
+        for j in range(descs.shape[1]):
+            assert_almost_equal(sqrt(np.sum(descs[i, j, :] ** 2)), 1)
+
+    orientations = 8
+    descs = daisy(img, orientations=orientations, normalization='daisy')
+    desc_dims = descs.shape[2]
+    for i in range(descs.shape[0]):
+        for j in range(descs.shape[1]):
+            for k in range(0, desc_dims, orientations):
+                assert_almost_equal(sqrt(np.sum(
+                    descs[i, j, k:k + orientations] ** 2)), 1)
+
+    img = np.zeros((50, 50))
+    descs = daisy(img, normalization='off')
+    for i in range(descs.shape[0]):
+        for j in range(descs.shape[1]):
+            assert_almost_equal(np.sum(descs[i, j, :]), 0)
+
+    with testing.raises(ValueError):
+        daisy(img, normalization='does_not_exist')
+
+
+def test_daisy_visualization():
+    img = img_as_float(data.astronaut()[:32, :32].mean(axis=2))
+    descs, descs_img = daisy(img, visualize=True)
+    assert(descs_img.shape == (32, 32, 3))

venv/Lib/site-packages/skimage/feature/tests/test_haar.py

@@ -0,0 +1,153 @@
+from random import shuffle
+from itertools import chain
+
+import pytest
+
+import numpy as np
+from numpy.testing import assert_allclose
+from numpy.testing import assert_array_equal
+
+from skimage.transform import integral_image
+from skimage.feature import haar_like_feature
+from skimage.feature import haar_like_feature_coord
+from skimage.feature import draw_haar_like_feature
+
+
+def test_haar_like_feature_error():
+    img = np.ones((5, 5), dtype=np.float32)
+    img_ii = integral_image(img)
+
+    feature_type = 'unknown_type'
+    with pytest.raises(ValueError):
+        haar_like_feature(img_ii, 0, 0, 5, 5, feature_type=feature_type)
+        haar_like_feature_coord(5, 5, feature_type=feature_type)
+        draw_haar_like_feature(img, 0, 0, 5, 5, feature_type=feature_type)
+
+    feat_coord, feat_type = haar_like_feature_coord(5, 5, 'type-2-x')
+    with pytest.raises(ValueError):
+        haar_like_feature(img_ii, 0, 0, 5, 5, feature_type=feat_type[:3],
+                          feature_coord=feat_coord)
+
+
+@pytest.mark.parametrize("dtype", [np.uint8, np.int8,
+                                   np.float32, np.float64])
+@pytest.mark.parametrize("feature_type,shape_feature,expected_feature_value",
+                         [('type-2-x', (84,), [0.]),
+                          ('type-2-y', (84,), [0.]),
+                          ('type-3-x', (42,), [-4., -3., -2., -1.]),
+                          ('type-3-y', (42,), [-4., -3., -2., -1.]),
+                          ('type-4', (36,), [0.])])
+def test_haar_like_feature(feature_type, shape_feature,
+                           expected_feature_value, dtype):
+    # test Haar-like feature on a basic one image
+    img = np.ones((5, 5), dtype=dtype)
+    img_ii = integral_image(img)
+    haar_feature = haar_like_feature(img_ii, 0, 0, 5, 5,
+                                     feature_type=feature_type)
+    assert_allclose(np.sort(np.unique(haar_feature)), expected_feature_value)
+
+
+@pytest.mark.parametrize("dtype", [np.uint8, np.int8,
+                                   np.float32, np.float64])
+@pytest.mark.parametrize("feature_type", ['type-2-x', 'type-2-y',
+                                          'type-3-x', 'type-3-y',
+                                          'type-4'])
+def test_haar_like_feature_fused_type(dtype, feature_type):
+    # check that the input type is kept
+    img = np.ones((5, 5), dtype=dtype)
+    img_ii = integral_image(img)
+    expected_dtype = img_ii.dtype
+    # to avoid overflow, unsigned type are converted to signed
+    if 'uint' in expected_dtype.name:
+        expected_dtype = np.dtype(expected_dtype.name.replace('u', ''))
+    haar_feature = haar_like_feature(img_ii, 0, 0, 5, 5,
+                                     feature_type=feature_type)
+    assert haar_feature.dtype == expected_dtype
+
+
+def test_haar_like_feature_list():
+    img = np.ones((5, 5), dtype=np.int8)
+    img_ii = integral_image(img)
+    feature_type = ['type-2-x', 'type-2-y', 'type-3-x', 'type-3-y', 'type-4']
+    haar_list = haar_like_feature(img_ii, 0, 0, 5, 5,
+                                  feature_type=feature_type)
+    haar_all = haar_like_feature(img_ii, 0, 0, 5, 5)
+    assert_array_equal(haar_list, haar_all)
+
+
+@pytest.mark.parametrize("feature_type", ['type-2-x', 'type-2-y',
+                                          'type-3-x', 'type-3-y',
+                                          'type-4',
+                                          ['type-2-y', 'type-3-x',
+                                           'type-4']])
+def test_haar_like_feature_precomputed(feature_type):
+    img = np.ones((5, 5), dtype=np.int8)
+    img_ii = integral_image(img)
+    if isinstance(feature_type, list):
+        # shuffle the index of the feature to be sure that we are output
+        # the features in the same order
+        shuffle(feature_type)
+        feat_coord, feat_type = zip(*[haar_like_feature_coord(5, 5, feat_t)
+                                      for feat_t in feature_type])
+        feat_coord = np.concatenate(feat_coord)
+        feat_type = np.concatenate(feat_type)
+    else:
+        feat_coord, feat_type = haar_like_feature_coord(5, 5, feature_type)
+    haar_feature_precomputed = haar_like_feature(img_ii, 0, 0, 5, 5,
+                                                 feature_type=feat_type,
+                                                 feature_coord=feat_coord)
+    haar_feature = haar_like_feature(img_ii, 0, 0, 5, 5, feature_type)
+    assert_array_equal(haar_feature_precomputed, haar_feature)
+
+
+@pytest.mark.parametrize("feature_type,height,width,expected_coord",
+                         [('type-2-x', 2, 2,
+                           [[[(0, 0), (0, 0)], [(0, 1), (0, 1)]],
+                            [[(1, 0), (1, 0)], [(1, 1), (1, 1)]]]),
+                          ('type-2-y', 2, 2,
+                           [[[(0, 0), (0, 0)], [(1, 0), (1, 0)]],
+                            [[(0, 1), (0, 1)], [(1, 1), (1, 1)]]]),
+                          ('type-3-x', 3, 3,
+                           [[[(0, 0), (0, 0)], [(0, 1), (0, 1)],
+                             [(0, 2), (0, 2)]],
+                            [[(0, 0), (1, 0)], [(0, 1), (1, 1)],
+                             [(0, 2), (1, 2)]],
+                            [[(1, 0), (1, 0)], [(1, 1), (1, 1)],
+                             [(1, 2), (1, 2)]],
+                            [[(1, 0), (2, 0)], [(1, 1), (2, 1)],
+                             [(1, 2), (2, 2)]],
+                            [[(2, 0), (2, 0)], [(2, 1), (2, 1)],
+                             [(2, 2), (2, 2)]]]),
+                          ('type-3-y', 3, 3,
+                           [[[(0, 0), (0, 0)], [(1, 0), (1, 0)],
+                             [(2, 0), (2, 0)]],
+                            [[(0, 0), (0, 1)], [(1, 0), (1, 1)],
+                             [(2, 0), (2, 1)]],
+                            [[(0, 1), (0, 1)], [(1, 1), (1, 1)],
+                             [(2, 1), (2, 1)]],
+                            [[(0, 1), (0, 2)], [(1, 1), (1, 2)],
+                             [(2, 1), (2, 2)]],
+                            [[(0, 2), (0, 2)], [(1, 2), (1, 2)],
+                             [(2, 2), (2, 2)]]]),
+                          ('type-4', 2, 2,
+                           [[[(0, 0), (0, 0)], [(0, 1), (0, 1)],
+                             [(1, 1), (1, 1)], [(1, 0), (1, 0)]]])])
+def test_haar_like_feature_coord(feature_type, height, width, expected_coord):
+    feat_coord, feat_type = haar_like_feature_coord(width, height,
+                                                    feature_type)
+    # convert the output to a full numpy array just for comparison
+    feat_coord = np.array([hf for hf in feat_coord])
+    assert_array_equal(feat_coord, expected_coord)
+    assert np.all(feat_type == feature_type)
+
+
+@pytest.mark.parametrize("max_n_features,nnz_values", [(None, 46),
+                                                       (1, 8)])
+def test_draw_haar_like_feature(max_n_features, nnz_values):
+    img = np.zeros((5, 5), dtype=np.float32)
+    coord, _ = haar_like_feature_coord(5, 5, 'type-4')
+    image = draw_haar_like_feature(img, 0, 0, 5, 5, coord,
+                                   max_n_features=max_n_features,
+                                   random_state=0)
+    assert image.shape == (5, 5, 3)
+    assert np.count_nonzero(image) == nnz_values

venv/Lib/site-packages/skimage/feature/tests/test_hog.py

@@ -0,0 +1,256 @@
+import os
+import numpy as np
+from scipy import ndimage as ndi
+from skimage import color
+from skimage import data
+from skimage import feature
+from skimage import img_as_float
+from skimage import draw
+from skimage._shared.testing import assert_almost_equal, fetch
+from skimage._shared import testing
+
+
+def test_hog_output_size():
+    img = img_as_float(data.astronaut()[:256, :].mean(axis=2))
+
+    fd = feature.hog(img, orientations=9, pixels_per_cell=(8, 8),
+                     cells_per_block=(1, 1), block_norm='L1')
+
+    assert len(fd) == 9 * (256 // 8) * (512 // 8)
+
+
+def test_hog_output_correctness_l1_norm():
+    img = color.rgb2gray(data.astronaut())
+    correct_output = np.load(fetch('data/astronaut_GRAY_hog_L1.npy'))
+
+    output = feature.hog(img, orientations=9, pixels_per_cell=(8, 8),
+                         cells_per_block=(3, 3), block_norm='L1',
+                         feature_vector=True, transform_sqrt=False,
+                         visualize=False)
+    assert_almost_equal(output, correct_output)
+
+
+def test_hog_output_correctness_l2hys_norm():
+    img = color.rgb2gray(data.astronaut())
+    correct_output = np.load(fetch('data/astronaut_GRAY_hog_L2-Hys.npy'))
+
+    output = feature.hog(img, orientations=9, pixels_per_cell=(8, 8),
+                         cells_per_block=(3, 3), block_norm='L2-Hys',
+                         feature_vector=True, transform_sqrt=False,
+                         visualize=False)
+    assert_almost_equal(output, correct_output)
+
+
+def test_hog_image_size_cell_size_mismatch():
+    image = data.camera()[:150, :200]
+    fd = feature.hog(image, orientations=9, pixels_per_cell=(8, 8),
+                     cells_per_block=(1, 1), block_norm='L1')
+    assert len(fd) == 9 * (150 // 8) * (200 // 8)
+
+
+def test_hog_basic_orientations_and_data_types():
+    # scenario:
+    #  1) create image (with float values) where upper half is filled by
+    #     zeros, bottom half by 100
+    #  2) create unsigned integer version of this image
+    #  3) calculate feature.hog() for both images, both with 'transform_sqrt'
+    #     option enabled and disabled
+    #  4) verify that all results are equal where expected
+    #  5) verify that computed feature vector is as expected
+    #  6) repeat the scenario for 90, 180 and 270 degrees rotated images
+
+    # size of testing image
+    width = height = 35
+
+    image0 = np.zeros((height, width), dtype='float')
+    image0[height // 2:] = 100
+
+    for rot in range(4):
+        # rotate by 0, 90, 180 and 270 degrees
+        image_float = np.rot90(image0, rot)
+
+        # create uint8 image from image_float
+        image_uint8 = image_float.astype('uint8')
+
+        (hog_float, hog_img_float) = feature.hog(
+            image_float, orientations=4, pixels_per_cell=(8, 8),
+            cells_per_block=(1, 1), visualize=True, transform_sqrt=False,
+            block_norm='L1')
+        (hog_uint8, hog_img_uint8) = feature.hog(
+            image_uint8, orientations=4, pixels_per_cell=(8, 8),
+            cells_per_block=(1, 1), visualize=True, transform_sqrt=False,
+            block_norm='L1')
+        (hog_float_norm, hog_img_float_norm) = feature.hog(
+            image_float, orientations=4, pixels_per_cell=(8, 8),
+            cells_per_block=(1, 1), visualize=True, transform_sqrt=True,
+            block_norm='L1')
+        (hog_uint8_norm, hog_img_uint8_norm) = feature.hog(
+            image_uint8, orientations=4, pixels_per_cell=(8, 8),
+            cells_per_block=(1, 1), visualize=True, transform_sqrt=True,
+            block_norm='L1')
+
+        # set to True to enable manual debugging with graphical output,
+        # must be False for automatic testing
+        if False:
+            import matplotlib.pyplot as plt
+            plt.figure()
+            plt.subplot(2, 3, 1)
+            plt.imshow(image_float)
+            plt.colorbar()
+            plt.title('image')
+            plt.subplot(2, 3, 2)
+            plt.imshow(hog_img_float)
+            plt.colorbar()
+            plt.title('HOG result visualisation (float img)')
+            plt.subplot(2, 3, 5)
+            plt.imshow(hog_img_uint8)
+            plt.colorbar()
+            plt.title('HOG result visualisation (uint8 img)')
+            plt.subplot(2, 3, 3)
+            plt.imshow(hog_img_float_norm)
+            plt.colorbar()
+            plt.title('HOG result (transform_sqrt) visualisation (float img)')
+            plt.subplot(2, 3, 6)
+            plt.imshow(hog_img_uint8_norm)
+            plt.colorbar()
+            plt.title('HOG result (transform_sqrt) visualisation (uint8 img)')
+            plt.show()
+
+        # results (features and visualisation) for float and uint8 images must
+        # be almost equal
+        assert_almost_equal(hog_float, hog_uint8)
+        assert_almost_equal(hog_img_float, hog_img_uint8)
+
+        # resulting features should be almost equal
+        # when 'transform_sqrt' is enabled
+        # or disabled (for current simple testing image)
+        assert_almost_equal(hog_float, hog_float_norm, decimal=4)
+        assert_almost_equal(hog_float, hog_uint8_norm, decimal=4)
+
+        # reshape resulting feature vector to matrix with 4 columns (each
+        # corresponding to one of 4 directions); only one direction should
+        # contain nonzero values (this is manually determined for testing
+        # image)
+        actual = np.max(hog_float.reshape(-1, 4), axis=0)
+
+        if rot in [0, 2]:
+            # image is rotated by 0 and 180 degrees
+            desired = [0, 0, 1, 0]
+        elif rot in [1, 3]:
+            # image is rotated by 90 and 270 degrees
+            desired = [1, 0, 0, 0]
+        else:
+            raise Exception('Result is not determined for this rotation.')
+
+        assert_almost_equal(actual, desired, decimal=2)
+
+
+def test_hog_orientations_circle():
+    # scenario:
+    #  1) create image with blurred circle in the middle
+    #  2) calculate feature.hog()
+    #  3) verify that the resulting feature vector contains uniformly
+    #     distributed values for all orientations, i.e. no orientation is
+    #     lost or emphasized
+    #  4) repeat the scenario for other 'orientations' option
+
+    # size of testing image
+    width = height = 100
+
+    image = np.zeros((height, width))
+    rr, cc = draw.disk((int(height / 2), int(width / 2)), int(width / 3))
+    image[rr, cc] = 100
+    image = ndi.gaussian_filter(image, 2)
+
+    for orientations in range(2, 15):
+        (hog, hog_img) = feature.hog(image, orientations=orientations,
+                                     pixels_per_cell=(8, 8),
+                                     cells_per_block=(1, 1), visualize=True,
+                                     transform_sqrt=False,
+                                     block_norm='L1')
+
+        # set to True to enable manual debugging with graphical output,
+        # must be False for automatic testing
+        if False:
+            import matplotlib.pyplot as plt
+            plt.figure()
+            plt.subplot(1, 2, 1)
+            plt.imshow(image)
+            plt.colorbar()
+            plt.title('image_float')
+            plt.subplot(1, 2, 2)
+            plt.imshow(hog_img)
+            plt.colorbar()
+            plt.title('HOG result visualisation, '
+                      'orientations=%d' % (orientations))
+            plt.show()
+
+        # reshape resulting feature vector to matrix with N columns (each
+        # column corresponds to one direction),
+        hog_matrix = hog.reshape(-1, orientations)
+
+        # compute mean values in the resulting feature vector for each
+        # direction, these values should be almost equal to the global mean
+        # value (since the image contains a circle), i.e., all directions have
+        # same contribution to the result
+        actual = np.mean(hog_matrix, axis=0)
+        desired = np.mean(hog_matrix)
+        assert_almost_equal(actual, desired, decimal=1)
+
+
+def test_hog_visualization_orientation():
+    """Test that the visualization produces a line with correct orientation
+
+    The hog visualization is expected to draw line segments perpendicular to
+    the midpoints of orientation bins.  This example verifies that when
+    orientations=3 and the gradient is entirely in the middle bin (bisected
+    by the y-axis), the line segment drawn by the visualization is horizontal.
+    """
+
+    width = height = 11
+
+    image = np.zeros((height, width), dtype='float')
+    image[height // 2:] = 1
+
+    _, hog_image = feature.hog(
+        image,
+        orientations=3,
+        pixels_per_cell=(width, height),
+        cells_per_block=(1, 1),
+        visualize=True,
+        block_norm='L1'
+    )
+
+    middle_index = height // 2
+    indices_excluding_middle = [x for x in range(height) if x != middle_index]
+
+    assert (hog_image[indices_excluding_middle, :] == 0).all()
+    assert (hog_image[middle_index, 1:-1] > 0).all()
+
+
+def test_hog_block_normalization_incorrect_error():
+    img = np.eye(4)
+    with testing.raises(ValueError):
+        feature.hog(img, block_norm='Linf')
+
+
+@testing.parametrize("shape,multichannel", [
+    ((3, 3, 3), False),
+    ((3, 3), True),
+    ((3, 3, 3, 3), True),
+])
+def test_hog_incorrect_dimensions(shape, multichannel):
+    img = np.zeros(shape)
+    with testing.raises(ValueError):
+        feature.hog(img, multichannel=multichannel, block_norm='L1')
+
+
+def test_hog_output_equivariance_multichannel():
+    img = data.astronaut()
+    img[:, :, (1, 2)] = 0
+    hog_ref = feature.hog(img, multichannel=True, block_norm='L1')
+
+    for n in (1, 2):
+        hog_fact = feature.hog(np.roll(img, n, axis=2), multichannel=True,
+                               block_norm='L1')
+        assert_almost_equal(hog_ref, hog_fact)

venv/Lib/site-packages/skimage/feature/tests/test_match.py

@@ -0,0 +1,179 @@
+import numpy as np
+from skimage._shared.testing import assert_equal
+from skimage import data
+from skimage import transform
+from skimage.color import rgb2gray
+from skimage.feature import (BRIEF, match_descriptors,
+                             corner_peaks, corner_harris)
+from skimage._shared import testing
+
+
+def test_binary_descriptors_unequal_descriptor_sizes_error():
+    """Sizes of descriptors of keypoints to be matched should be equal."""
+    descs1 = np.array([[True, True, False, True],
+                       [False, True, False, True]])
+    descs2 = np.array([[True, False, False, True, False],
+                       [False, True, True, True, False]])
+    with testing.raises(ValueError):
+        match_descriptors(descs1, descs2)
+
+
+def test_binary_descriptors():
+    descs1 = np.array([[True, True, False, True, True],
+                       [False, True, False, True, True]])
+    descs2 = np.array([[True, False, False, True, False],
+                       [False, False, True, True, True]])
+    matches = match_descriptors(descs1, descs2)
+    assert_equal(matches, [[0, 0], [1, 1]])
+
+
+def test_binary_descriptors_rotation_crosscheck_false():
+    """Verify matched keypoints and their corresponding masks results between
+    image and its rotated version with the expected keypoint pairs with
+    cross_check disabled."""
+    img = data.astronaut()
+    img = rgb2gray(img)
+    tform = transform.SimilarityTransform(scale=1, rotation=0.15, translation=(0, 0))
+    rotated_img = transform.warp(img, tform, clip=False)
+
+    extractor = BRIEF(descriptor_size=512)
+
+    keypoints1 = corner_peaks(corner_harris(img), min_distance=5,
+                              threshold_abs=0, threshold_rel=0.1)
+    extractor.extract(img, keypoints1)
+    descriptors1 = extractor.descriptors
+
+    keypoints2 = corner_peaks(corner_harris(rotated_img), min_distance=5,
+                              threshold_abs=0, threshold_rel=0.1)
+    extractor.extract(rotated_img, keypoints2)
+    descriptors2 = extractor.descriptors
+
+    matches = match_descriptors(descriptors1, descriptors2, cross_check=False)
+
+    exp_matches1 = np.arange(47)
+    exp_matches2 = np.array([0, 2, 1, 3, 4, 5, 7, 8, 14, 9, 11, 13,
+                             23, 15, 16, 22, 17, 19, 34, 18, 24, 27,
+                             30, 25, 26, 32, 28, 35, 37, 42, 29, 38,
+                             33, 40, 36, 3, 10, 32, 43, 15, 29, 41,
+                             1, 18, 32, 24, 11])
+
+    assert_equal(matches[:, 0], exp_matches1)
+    assert_equal(matches[:, 1], exp_matches2)
+
+    # minkowski takes a different code path, therefore we test it explicitly
+    matches = match_descriptors(descriptors1, descriptors2,
+                                metric='minkowski', cross_check=False)
+    assert_equal(matches[:, 0], exp_matches1)
+    assert_equal(matches[:, 1], exp_matches2)
+
+    # it also has an extra parameter
+    matches = match_descriptors(descriptors1, descriptors2,
+                                metric='minkowski', p=4, cross_check=False)
+    assert_equal(matches[:, 0], exp_matches1)
+    assert_equal(matches[:, 1], exp_matches2)
+
+
+def test_binary_descriptors_rotation_crosscheck_true():
+    """Verify matched keypoints and their corresponding masks results between
+    image and its rotated version with the expected keypoint pairs with
+    cross_check enabled."""
+    img = data.astronaut()
+    img = rgb2gray(img)
+    tform = transform.SimilarityTransform(scale=1, rotation=0.15, translation=(0, 0))
+    rotated_img = transform.warp(img, tform, clip=False)
+
+    extractor = BRIEF(descriptor_size=512)
+
+    keypoints1 = corner_peaks(corner_harris(img), min_distance=5,
+                              threshold_abs=0, threshold_rel=0.1)
+    extractor.extract(img, keypoints1)
+    descriptors1 = extractor.descriptors
+
+    keypoints2 = corner_peaks(corner_harris(rotated_img), min_distance=5,
+                              threshold_abs=0, threshold_rel=0.1)
+    extractor.extract(rotated_img, keypoints2)
+    descriptors2 = extractor.descriptors
+
+    matches = match_descriptors(descriptors1, descriptors2, cross_check=True)
+
+    exp_matches1 = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
+                             13, 14, 15, 16, 17, 19, 20, 21, 22, 23,
+                             24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
+                             34, 38, 41])
+    exp_matches2 = np.array([0, 2, 1, 3, 4, 5, 7, 8, 14, 9, 11, 13,
+                             23, 15, 16, 22, 17, 19, 18, 24, 27, 30,
+                             25, 26, 32, 28, 35, 37, 42, 29, 38, 33,
+                             40, 36, 43, 41])
+    assert_equal(matches[:, 0], exp_matches1)
+    assert_equal(matches[:, 1], exp_matches2)
+
+
+def test_max_distance():
+    descs1 = np.zeros((10, 128))
+    descs2 = np.zeros((15, 128))
+
+    descs1[0, :] = 1
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_distance=0.1, cross_check=False)
+    assert len(matches) == 9
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_distance=np.sqrt(128.1),
+                                cross_check=False)
+    assert len(matches) == 10
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_distance=0.1,
+                                cross_check=True)
+    assert_equal(matches, [[1, 0]])
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_distance=np.sqrt(128.1),
+                                cross_check=True)
+    assert_equal(matches, [[1, 0]])
+
+
+def test_max_ratio():
+    descs1 = 10 * np.arange(10)[:, None].astype(np.float32)
+    descs2 = 10 * np.arange(15)[:, None].astype(np.float32)
+
+    descs2[0] = 5.0
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=1.0, cross_check=False)
+    assert_equal(len(matches), 10)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=0.6, cross_check=False)
+    assert_equal(len(matches), 10)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=0.5, cross_check=False)
+    assert_equal(len(matches), 9)
+
+    descs1[0] = 7.5
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=0.5, cross_check=False)
+    assert_equal(len(matches), 9)
+
+    descs2 = 10 * np.arange(1)[:, None].astype(np.float32)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=1.0, cross_check=False)
+    assert_equal(len(matches), 10)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=0.5, cross_check=False)
+    assert_equal(len(matches), 10)
+
+    descs1 = 10 * np.arange(1)[:, None].astype(np.float32)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=1.0, cross_check=False)
+    assert_equal(len(matches), 1)
+
+    matches = match_descriptors(descs1, descs2, metric='euclidean',
+                                max_ratio=0.5, cross_check=False)
+    assert_equal(len(matches), 1)

venv/Lib/site-packages/skimage/feature/tests/test_orb.py

@@ -0,0 +1,131 @@
+import pytest
+import numpy as np
+
+from skimage._shared.testing import assert_equal, assert_almost_equal
+from skimage.feature import ORB
+from skimage._shared import testing
+from skimage import data
+from skimage._shared.testing import test_parallel, xfail, arch32
+from skimage.util.dtype import _convert
+
+
+img = data.coins()
+
+
+@test_parallel()
+@pytest.mark.parametrize('dtype', ['float32', 'float64', 'uint8',
+                                   'uint16', 'int64'])
+def test_keypoints_orb_desired_no_of_keypoints(dtype):
+    _img = _convert(img, dtype)
+    detector_extractor = ORB(n_keypoints=10, fast_n=12, fast_threshold=0.20)
+    detector_extractor.detect(_img)
+
+    exp_rows = np.array([141., 108., 214.56, 131., 214.272, 67.,
+                         206., 177., 108., 141.])
+    exp_cols = np.array([323., 328., 282.24, 292., 281.664, 85.,
+                         260., 284., 328.8, 267.])
+
+    exp_scales = np.array([1,  1,  1.44,  1,  1.728, 1, 1, 1, 1.2, 1])
+
+    exp_orientations = np.array([-53.97446153, 59.5055285, -96.01885186,
+                                 -149.70789506, -94.70171899, -45.76429535,
+                                 -51.49752849, 113.57081195, 63.30428063,
+                                 -79.56091118])
+    exp_response = np.array([1.01168357, 0.82934145, 0.67784179, 0.57176438,
+                             0.56637459, 0.52248355, 0.43696175, 0.42992376,
+                             0.37700486, 0.36126832])
+
+    assert_almost_equal(exp_rows, detector_extractor.keypoints[:, 0])
+    assert_almost_equal(exp_cols, detector_extractor.keypoints[:, 1])
+    assert_almost_equal(exp_scales, detector_extractor.scales)
+    assert_almost_equal(exp_response, detector_extractor.responses, 5)
+    assert_almost_equal(exp_orientations,
+                        np.rad2deg(detector_extractor.orientations), 4)
+
+    detector_extractor.detect_and_extract(img)
+    assert_almost_equal(exp_rows, detector_extractor.keypoints[:, 0])
+    assert_almost_equal(exp_cols, detector_extractor.keypoints[:, 1])
+
+
+@pytest.mark.parametrize('dtype', ['float32', 'float64', 'uint8',
+                                   'uint16', 'int64'])
+def test_keypoints_orb_less_than_desired_no_of_keypoints(dtype):
+    _img = _convert(img, dtype)
+    detector_extractor = ORB(n_keypoints=15, fast_n=12,
+                             fast_threshold=0.33, downscale=2, n_scales=2)
+    detector_extractor.detect(_img)
+
+    exp_rows = np.array([108., 203., 140.,  65.,  58.])
+    exp_cols = np.array([293., 267., 202., 130., 291.])
+
+    exp_scales = np.array([1., 1., 1., 1., 1.])
+
+    exp_orientations = np.array([151.93906, -56.90052, -79.46341,
+                                 -59.42996, -158.26941])
+
+    exp_response = np.array([-0.1764169, 0.2652126, -0.0324343,
+                             0.0400902, 0.2667641])
+
+    assert_almost_equal(exp_rows, detector_extractor.keypoints[:, 0])
+    assert_almost_equal(exp_cols, detector_extractor.keypoints[:, 1])
+    assert_almost_equal(exp_scales, detector_extractor.scales)
+    assert_almost_equal(exp_response, detector_extractor.responses)
+    assert_almost_equal(exp_orientations,
+                        np.rad2deg(detector_extractor.orientations), 3)
+
+    detector_extractor.detect_and_extract(img)
+    assert_almost_equal(exp_rows, detector_extractor.keypoints[:, 0])
+    assert_almost_equal(exp_cols, detector_extractor.keypoints[:, 1])
+
+
+@xfail(condition=arch32,
+       reason=('Known test failure on 32-bit platforms. See links for '
+               'details: '
+               'https://github.com/scikit-image/scikit-image/issues/3091 '
+               'https://github.com/scikit-image/scikit-image/issues/2529'))
+def test_descriptor_orb():
+    detector_extractor = ORB(fast_n=12, fast_threshold=0.20)
+    exp_descriptors = np.array([[0, 0, 0, 1, 0, 0, 0, 1, 0, 1],
+                                [1, 1, 0, 1, 0, 0, 0, 1, 0, 1],
+                                [1, 1, 0, 0, 1, 0, 0, 0, 1, 1],
+                                [1, 1, 1, 0, 0, 0, 1, 1, 1, 0],
+                                [0, 0, 0, 1, 0, 1, 1, 1, 1, 1],
+                                [1, 0, 0, 1, 1, 0, 0, 0, 1, 0],
+                                [0, 1, 1, 1, 1, 1, 1, 1, 1, 0],
+                                [1, 1, 1, 0, 1, 1, 1, 1, 0, 0],
+                                [1, 1, 1, 1, 0, 0, 0, 1, 1, 1],
+                                [0, 1, 1, 0, 0, 1, 1, 0, 1, 1],
+                                [1, 1, 0, 0, 0, 0, 0, 0, 1, 1],
+                                [1, 0, 0, 0, 0, 1, 0, 1, 1, 1],
+                                [1, 0, 1, 1, 1, 0, 1, 0, 1, 0],
+                                [0, 0, 1, 1, 0, 0, 0, 0, 1, 1],
+                                [0, 1, 1, 0, 0, 0, 1, 0, 0, 1],
+                                [0, 1, 1, 0, 0, 0, 1, 1, 1, 1],
+                                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1],
+                                [0, 0, 1, 1, 1, 1, 0, 1, 1, 0],
+                                [0, 0, 1, 1, 1, 0, 1, 0, 0, 1],
+                                [0, 1, 0, 0, 0, 0, 0, 0, 1, 0]], dtype=bool)
+
+    detector_extractor.detect(img)
+    detector_extractor.extract(img, detector_extractor.keypoints,
+                               detector_extractor.scales,
+                               detector_extractor.orientations)
+
+    assert_equal(exp_descriptors,
+                 detector_extractor.descriptors[100:120, 10:20])
+
+    detector_extractor.detect_and_extract(img)
+    assert_equal(exp_descriptors,
+                 detector_extractor.descriptors[100:120, 10:20])
+    keypoints_count = detector_extractor.keypoints.shape[0]
+    assert keypoints_count == detector_extractor.descriptors.shape[0]
+    assert keypoints_count == detector_extractor.orientations.shape[0]
+    assert keypoints_count == detector_extractor.responses.shape[0]
+    assert keypoints_count == detector_extractor.scales.shape[0]
+
+
+def test_no_descriptors_extracted_orb():
+    img = np.ones((128, 128))
+    detector_extractor = ORB()
+    with testing.raises(RuntimeError):
+        detector_extractor.detect_and_extract(img)

venv/Lib/site-packages/skimage/feature/tests/test_peak.py

@@ -0,0 +1,537 @@
+import itertools
+import numpy as np
+import pytest
+import unittest
+from skimage._shared.testing import assert_array_almost_equal
+from skimage._shared.testing import assert_equal
+from scipy import ndimage as ndi
+from skimage.feature import peak
+
+
+np.random.seed(21)
+
+class TestPeakLocalMax():
+    def test_trivial_case(self):
+        trivial = np.zeros((25, 25))
+        peak_indices = peak.peak_local_max(trivial, min_distance=1, indices=True)
+        assert type(peak_indices) is np.ndarray
+        assert peak_indices.size == 0
+        peaks = peak.peak_local_max(trivial, min_distance=1, indices=False)
+        assert (peaks.astype(np.bool) == trivial).all()
+
+    def test_noisy_peaks(self):
+        peak_locations = [(7, 7), (7, 13), (13, 7), (13, 13)]
+
+        # image with noise of amplitude 0.8 and peaks of amplitude 1
+        image = 0.8 * np.random.rand(20, 20)
+        for r, c in peak_locations:
+            image[r, c] = 1
+
+        peaks_detected = peak.peak_local_max(image, min_distance=5)
+
+        assert len(peaks_detected) == len(peak_locations)
+        for loc in peaks_detected:
+            assert tuple(loc) in peak_locations
+
+    def test_relative_threshold(self):
+        image = np.zeros((5, 5), dtype=np.uint8)
+        image[1, 1] = 10
+        image[3, 3] = 20
+        peaks = peak.peak_local_max(image, min_distance=1, threshold_rel=0.5)
+        assert len(peaks) == 1
+        assert_array_almost_equal(peaks, [(3, 3)])
+
+    def test_absolute_threshold(self):
+        image = np.zeros((5, 5), dtype=np.uint8)
+        image[1, 1] = 10
+        image[3, 3] = 20
+        peaks = peak.peak_local_max(image, min_distance=1, threshold_abs=10)
+        assert len(peaks) == 1
+        assert_array_almost_equal(peaks, [(3, 3)])
+
+    def test_constant_image(self):
+        image = np.full((20, 20), 128, dtype=np.uint8)
+        peaks = peak.peak_local_max(image, min_distance=1)
+        assert len(peaks) == 0
+
+    def test_flat_peak(self):
+        image = np.zeros((5, 5), dtype=np.uint8)
+        image[1:3, 1:3] = 10
+        peaks = peak.peak_local_max(image, min_distance=1)
+        assert len(peaks) == 4
+
+    def test_sorted_peaks(self):
+        image = np.zeros((5, 5), dtype=np.uint8)
+        image[1, 1] = 20
+        image[3, 3] = 10
+        peaks = peak.peak_local_max(image, min_distance=1)
+        assert peaks.tolist() == [[1, 1], [3, 3]]
+
+        image = np.zeros((3, 10))
+        image[1, (1, 3, 5, 7)] = (1, 2, 3, 4)
+        peaks = peak.peak_local_max(image, min_distance=1)
+        assert peaks.tolist() == [[1, 7], [1, 5], [1, 3], [1, 1]]
+
+    def test_num_peaks(self):
+        image = np.zeros((7, 7), dtype=np.uint8)
+        image[1, 1] = 10
+        image[1, 3] = 11
+        image[1, 5] = 12
+        image[3, 5] = 8
+        image[5, 3] = 7
+        assert len(peak.peak_local_max(image, min_distance=1, threshold_abs=0)) == 5
+        peaks_limited = peak.peak_local_max(
+            image, min_distance=1, threshold_abs=0, num_peaks=2)
+        assert len(peaks_limited) == 2
+        assert (1, 3) in peaks_limited
+        assert (1, 5) in peaks_limited
+        peaks_limited = peak.peak_local_max(
+            image, min_distance=1, threshold_abs=0, num_peaks=4)
+        assert len(peaks_limited) == 4
+        assert (1, 3) in peaks_limited
+        assert (1, 5) in peaks_limited
+        assert (1, 1) in peaks_limited
+        assert (3, 5) in peaks_limited
+
+    def test_num_peaks_and_labels(self):
+        image = np.zeros((7, 7), dtype=np.uint8)
+        labels = np.zeros((7, 7), dtype=np.uint8) + 20
+        image[1, 1] = 10
+        image[1, 3] = 11
+        image[1, 5] = 12
+        image[3, 5] = 8
+        image[5, 3] = 7
+        peaks_limited = peak.peak_local_max(
+            image, min_distance=1, threshold_abs=0, labels=labels)
+        assert len(peaks_limited) == 5
+        peaks_limited = peak.peak_local_max(
+            image, min_distance=1, threshold_abs=0, labels=labels, num_peaks=2)
+        assert len(peaks_limited) == 2
+
+
+    def test_num_peaks_tot_vs_labels_4quadrants(self):
+        np.random.seed(21)
+        image = np.random.uniform(size=(20, 30))
+        i, j = np.mgrid[0:20, 0:30]
+        labels = 1 + (i >= 10) + (j >= 15) * 2
+        result = peak.peak_local_max(image, labels=labels,
+                                     min_distance=1, threshold_rel=0,
+                                     indices=True,
+                                     num_peaks=np.inf,
+                                     num_peaks_per_label=2)
+        assert len(result) == 8
+        result = peak.peak_local_max(image, labels=labels,
+                                     min_distance=1, threshold_rel=0,
+                                     indices=True,
+                                     num_peaks=np.inf,
+                                     num_peaks_per_label=1)
+        assert len(result) == 4
+        result = peak.peak_local_max(image, labels=labels,
+                                     min_distance=1, threshold_rel=0,
+                                     indices=True,
+                                     num_peaks=2,
+                                     num_peaks_per_label=2)
+        assert len(result) == 2
+
+
+    def test_num_peaks3D(self):
+        # Issue 1354: the old code only hold for 2D arrays
+        # and this code would die with IndexError
+        image = np.zeros((10, 10, 100))
+        image[5,5,::5] = np.arange(20)
+        peaks_limited = peak.peak_local_max(image, min_distance=1, num_peaks=2)
+        assert len(peaks_limited) == 2
+
+    def test_reorder_labels(self):
+        image = np.random.uniform(size=(40, 60))
+        i, j = np.mgrid[0:40, 0:60]
+        labels = 1 + (i >= 20) + (j >= 30) * 2
+        labels[labels == 4] = 5
+        i, j = np.mgrid[-3:4, -3:4]
+        footprint = (i * i + j * j <= 9)
+        expected = np.zeros(image.shape, float)
+        for imin, imax in ((0, 20), (20, 40)):
+            for jmin, jmax in ((0, 30), (30, 60)):
+                expected[imin:imax, jmin:jmax] = ndi.maximum_filter(
+                                image[imin:imax, jmin:jmax], footprint=footprint)
+        expected = (expected == image)
+        result = peak.peak_local_max(image, labels=labels, min_distance=1,
+                                     threshold_rel=0, footprint=footprint,
+                                     indices=False, exclude_border=False)
+        assert (result == expected).all()
+
+    def test_indices_with_labels(self):
+        image = np.random.uniform(size=(40, 60))
+        i, j = np.mgrid[0:40, 0:60]
+        labels = 1 + (i >= 20) + (j >= 30) * 2
+        i, j = np.mgrid[-3:4, -3:4]
+        footprint = (i * i + j * j <= 9)
+        expected = np.zeros(image.shape, float)
+        for imin, imax in ((0, 20), (20, 40)):
+            for jmin, jmax in ((0, 30), (30, 60)):
+                expected[imin:imax, jmin:jmax] = ndi.maximum_filter(
+                    image[imin:imax, jmin:jmax], footprint=footprint)
+        expected = np.transpose(np.nonzero(expected == image))
+        expected = expected[np.argsort(image[tuple(expected.T)])[::-1]]
+        result = peak.peak_local_max(image, labels=labels, min_distance=1,
+                                     threshold_rel=0, footprint=footprint,
+                                     indices=True, exclude_border=False)
+        result = result[np.argsort(image[tuple(result.T)])[::-1]]
+        assert (result == expected).all()
+
+    def test_ndarray_indices_false(self):
+        nd_image = np.zeros((5, 5, 5))
+        nd_image[2, 2, 2] = 1
+        peaks = peak.peak_local_max(nd_image, min_distance=1, indices=False)
+        assert (peaks == nd_image.astype(np.bool)).all()
+
+    def test_ndarray_exclude_border(self):
+        nd_image = np.zeros((5, 5, 5))
+        nd_image[[1, 0, 0], [0, 1, 0], [0, 0, 1]] = 1
+        nd_image[3, 0, 0] = 1
+        nd_image[2, 2, 2] = 1
+        expected = np.zeros_like(nd_image, dtype=np.bool)
+        expected[2, 2, 2] = True
+        expectedNoBorder = nd_image > 0
+        result = peak.peak_local_max(nd_image, min_distance=2,
+            exclude_border=2, indices=False)
+        assert_equal(result, expected)
+        # Check that bools work as expected
+        assert_equal(
+            peak.peak_local_max(nd_image, min_distance=2,
+                exclude_border=2, indices=False),
+            peak.peak_local_max(nd_image, min_distance=2,
+                exclude_border=True, indices=False)
+            )
+        assert_equal(
+            peak.peak_local_max(nd_image, min_distance=2,
+                exclude_border=0, indices=False),
+            peak.peak_local_max(nd_image, min_distance=2,
+                exclude_border=False, indices=False)
+            )
+        # Check both versions with  no border
+        assert_equal(
+            peak.peak_local_max(nd_image, min_distance=2,
+                exclude_border=0, indices=False),
+            expectedNoBorder,
+            )
+        assert_equal(
+            peak.peak_local_max(nd_image,
+                exclude_border=False, indices=False),
+            expectedNoBorder,
+            )
+
+    def test_empty(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(~ result)
+
+    def test_empty_non2d_indices(self):
+        image = np.zeros((10, 10, 10))
+        result = peak.peak_local_max(image,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=True, exclude_border=False)
+        assert result.shape == (0, image.ndim)
+
+    def test_one_point(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        labels[5, 5] = 1
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == (labels == 1))
+
+    def test_adjacent_and_same(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5:6] = 1
+        labels[5, 5:6] = 1
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == (labels == 1))
+
+    def test_adjacent_and_different(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        image[5, 6] = .5
+        labels[5, 5:6] = 1
+        expected = (image == 1)
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+        result = peak.peak_local_max(image, labels=labels,
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+
+    def test_not_adjacent_and_different(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        image[5, 8] = .5
+        labels[image > 0] = 1
+        expected = (labels == 1)
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+
+    def test_two_objects(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        image[5, 15] = .5
+        labels[5, 5] = 1
+        labels[5, 15] = 2
+        expected = (labels > 0)
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+
+    def test_adjacent_different_objects(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        image[5, 6] = .5
+        labels[5, 5] = 1
+        labels[5, 6] = 2
+        expected = (labels > 0)
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+
+    def test_four_quadrants(self):
+        image = np.random.uniform(size=(20, 30))
+        i, j = np.mgrid[0:20, 0:30]
+        labels = 1 + (i >= 10) + (j >= 15) * 2
+        i, j = np.mgrid[-3:4, -3:4]
+        footprint = (i * i + j * j <= 9)
+        expected = np.zeros(image.shape, float)
+        for imin, imax in ((0, 10), (10, 20)):
+            for jmin, jmax in ((0, 15), (15, 30)):
+                expected[imin:imax, jmin:jmax] = ndi.maximum_filter(
+                    image[imin:imax, jmin:jmax], footprint=footprint)
+        expected = (expected == image)
+        result = peak.peak_local_max(image, labels=labels, footprint=footprint,
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(result == expected)
+
+    def test_disk(self):
+        '''regression test of img-1194, footprint = [1]
+        Test peak.peak_local_max when every point is a local maximum
+        '''
+        image = np.random.uniform(size=(10, 20))
+        footprint = np.array([[1]])
+        result = peak.peak_local_max(image, labels=np.ones((10, 20)),
+                                     footprint=footprint,
+                                     min_distance=1, threshold_rel=0,
+                                     threshold_abs=-1, indices=False,
+                                     exclude_border=False)
+        assert np.all(result)
+        result = peak.peak_local_max(image, footprint=footprint, threshold_abs=-1,
+                                     indices=False, exclude_border=False)
+        assert np.all(result)
+
+    def test_3D(self):
+        image = np.zeros((30, 30, 30))
+        image[15, 15, 15] = 1
+        image[5, 5, 5] = 1
+        assert_equal(peak.peak_local_max(image, min_distance=10, threshold_rel=0),
+                     [[15, 15, 15]])
+        assert_equal(peak.peak_local_max(image, min_distance=6, threshold_rel=0),
+                     [[15, 15, 15]])
+        assert sorted(peak.peak_local_max(image, min_distance=10, threshold_rel=0,
+                                          exclude_border=False).tolist()) == \
+            [[5, 5, 5], [15, 15, 15]]
+        assert sorted(peak.peak_local_max(image, min_distance=5,
+                                          threshold_rel=0).tolist()) == \
+            [[5, 5, 5], [15, 15, 15]]
+
+    def test_4D(self):
+        image = np.zeros((30, 30, 30, 30))
+        image[15, 15, 15, 15] = 1
+        image[5, 5, 5, 5] = 1
+        assert_equal(peak.peak_local_max(image, min_distance=10, threshold_rel=0),
+                     [[15, 15, 15, 15]])
+        assert_equal(peak.peak_local_max(image, min_distance=6, threshold_rel=0),
+                     [[15, 15, 15, 15]])
+        assert sorted(peak.peak_local_max(image, min_distance=10, threshold_rel=0,
+                                          exclude_border=False).tolist()) == \
+            [[5, 5, 5, 5], [15, 15, 15, 15]]
+        assert sorted(peak.peak_local_max(image, min_distance=5,
+                                          threshold_rel=0).tolist()) == \
+            [[5, 5, 5, 5], [15, 15, 15, 15]]
+
+    def test_threshold_rel_default(self):
+        image = np.ones((5, 5))
+
+        image[2, 2] = 1
+        assert len(peak.peak_local_max(image)) == 0
+
+        image[2, 2] = 2
+        assert_equal(peak.peak_local_max(image), [[2, 2]])
+
+        image[2, 2] = 0
+        assert len(peak.peak_local_max(image, min_distance=0)) == image.size - 1
+
+
+@pytest.mark.parametrize(
+    ["indices"],
+    [[indices] for indices in itertools.product(range(5), range(5))],
+)
+def test_exclude_border(indices):
+    image = np.zeros((5, 5))
+    image[indices] = 1
+
+    # exclude_border = False, means it will always be found.
+    assert len(peak.peak_local_max(image, exclude_border=False)) == 1
+
+    # exclude_border = 0, means it will always be found.
+    assert len(peak.peak_local_max(image, exclude_border=0)) == 1
+
+    # exclude_border = True, min_distance=1 means it will be found unless it's
+    # on the edge.
+    if indices[0] in (0, 4) or indices[1] in (0, 4):
+        expected_peaks = 0
+    else:
+        expected_peaks = 1
+    assert len(peak.peak_local_max(
+        image, min_distance=1, exclude_border=True)) == expected_peaks
+
+    # exclude_border = (1, 0) means it will be found unless it's on the edge of
+    # the first dimension.
+    if indices[0] in (0, 4):
+        expected_peaks = 0
+    else:
+        expected_peaks = 1
+    assert len(peak.peak_local_max(
+        image, exclude_border=(1, 0))) == expected_peaks
+
+    # exclude_border = (0, 1) means it will be found unless it's on the edge of
+    # the second dimension.
+    if indices[1] in (0, 4):
+        expected_peaks = 0
+    else:
+        expected_peaks = 1
+    assert len(peak.peak_local_max(
+        image, exclude_border=(0, 1))) == expected_peaks
+
+
+def test_exclude_border_errors():
+    image = np.zeros((5, 5))
+
+    # exclude_border doesn't have the right cardinality.
+    with pytest.raises(ValueError):
+        assert peak.peak_local_max(image, exclude_border=(1,))
+
+    # exclude_border doesn't have the right type
+    with pytest.raises(TypeError):
+        assert peak.peak_local_max(image, exclude_border=1.0)
+
+    # exclude_border is a tuple of the right cardinality but contains
+    # non-integer values.
+    with pytest.raises(ValueError):
+        assert peak.peak_local_max(image, exclude_border=(1, 'a'))
+
+    # exclude_border is a tuple of the right cardinality but contains a
+    # negative value.
+    with pytest.raises(ValueError):
+        assert peak.peak_local_max(image, exclude_border=(1, -1))
+
+    # exclude_border is a negative value.
+    with pytest.raises(ValueError):
+        assert peak.peak_local_max(image, exclude_border=-1)
+
+
+class TestProminentPeaks(unittest.TestCase):
+    def test_isolated_peaks(self):
+        image = np.zeros((15, 15))
+        x0, y0, i0 = (12, 8, 1)
+        x1, y1, i1 = (2, 2, 1)
+        x2, y2, i2 = (5, 13, 1)
+        image[y0, x0] = i0
+        image[y1, x1] = i1
+        image[y2, x2] = i2
+        out = peak._prominent_peaks(image)
+        assert len(out[0]) == 3
+        for i, x, y in zip (out[0], out[1], out[2]):
+            self.assertTrue(i in (i0, i1, i2))
+            self.assertTrue(x in (x0, x1, x2))
+            self.assertTrue(y in (y0, y1, y2))
+
+    def test_threshold(self):
+        image = np.zeros((15, 15))
+        x0, y0, i0 = (12, 8, 10)
+        x1, y1, i1 = (2, 2, 8)
+        x2, y2, i2 = (5, 13, 10)
+        image[y0, x0] = i0
+        image[y1, x1] = i1
+        image[y2, x2] = i2
+        out = peak._prominent_peaks(image, threshold=None)
+        assert len(out[0]) == 3
+        for i, x, y in zip (out[0], out[1], out[2]):
+            self.assertTrue(i in (i0, i1, i2))
+            self.assertTrue(x in (x0, x1, x2))
+        out = peak._prominent_peaks(image, threshold=9)
+        assert len(out[0]) == 2
+        for i, x, y in zip (out[0], out[1], out[2]):
+            self.assertTrue(i in (i0, i2))
+            self.assertTrue(x in (x0, x2))
+            self.assertTrue(y in (y0, y2))
+
+    def test_peaks_in_contact(self):
+        image = np.zeros((15, 15))
+        x0, y0, i0 = (8, 8, 1)
+        x1, y1, i1 = (7, 7, 1) # prominent peak
+        x2, y2, i2 = (6, 6, 1)
+        image[y0, x0] = i0
+        image[y1, x1] = i1
+        image[y2, x2] = i2
+        out = peak._prominent_peaks(image, min_xdistance=3,
+                                   min_ydistance=3,)
+        assert_equal(out[0], np.array((i1,)))
+        assert_equal(out[1], np.array((x1,)))
+        assert_equal(out[2], np.array((y1,)))
+
+    def test_input_labels_unmodified(self):
+        image = np.zeros((10, 20))
+        labels = np.zeros((10, 20), int)
+        image[5, 5] = 1
+        labels[5, 5] = 1
+        labelsin = labels.copy()
+        result = peak.peak_local_max(image, labels=labels,
+                                     footprint=np.ones((3, 3), bool),
+                                     min_distance=1, threshold_rel=0,
+                                     indices=False, exclude_border=False)
+        assert np.all(labels == labelsin)
+
+    def test_many_objects(self):
+        mask = np.zeros([500, 500], dtype=bool)
+        x, y = np.indices((500, 500))
+        x_c = x // 20 * 20 + 10
+        y_c = y // 20 * 20 + 10
+        mask[(x - x_c) ** 2 + (y - y_c) ** 2 < 8 ** 2] = True
+        labels, num_objs = ndi.label(mask)
+        dist = ndi.distance_transform_edt(mask)
+        local_max = peak.peak_local_max(dist, min_distance=20, indices=True,
+                                        exclude_border=False, labels=labels)
+        assert len(local_max) == 625

venv/Lib/site-packages/skimage/feature/tests/test_template.py

@@ -0,0 +1,186 @@
+import numpy as np
+from skimage._shared.testing import assert_almost_equal, assert_equal
+
+from skimage import data, img_as_float
+from skimage.morphology import diamond
+from skimage.feature import match_template, peak_local_max
+from skimage._shared import testing
+
+
+def test_template():
+    size = 100
+    # Float prefactors ensure that image range is between 0 and 1
+    image = np.full((400, 400), 0.5)
+    target = 0.1 * (np.tri(size) + np.tri(size)[::-1])
+    target_positions = [(50, 50), (200, 200)]
+    for x, y in target_positions:
+        image[x:x + size, y:y + size] = target
+    np.random.seed(1)
+    image += 0.1 * np.random.uniform(size=(400, 400))
+
+    result = match_template(image, target)
+    delta = 5
+
+    positions = peak_local_max(result, min_distance=delta)
+
+    if len(positions) > 2:
+        # Keep the two maximum peaks.
+        intensities = result[tuple(positions.T)]
+        i_maxsort = np.argsort(intensities)[::-1]
+        positions = positions[i_maxsort][:2]
+
+    # Sort so that order matches `target_positions`.
+    positions = positions[np.argsort(positions[:, 0])]
+
+    for xy_target, xy in zip(target_positions, positions):
+        assert_almost_equal(xy, xy_target)
+
+
+def test_normalization():
+    """Test that `match_template` gives the correct normalization.
+
+    Normalization gives 1 for a perfect match and -1 for an inverted-match.
+    This test adds positive and negative squares to a zero-array and matches
+    the array with a positive template.
+    """
+    n = 5
+    N = 20
+    ipos, jpos = (2, 3)
+    ineg, jneg = (12, 11)
+    image = np.full((N, N), 0.5)
+    image[ipos:ipos + n, jpos:jpos + n] = 1
+    image[ineg:ineg + n, jneg:jneg + n] = 0
+
+    # white square with a black border
+    template = np.zeros((n + 2, n + 2))
+    template[1:1 + n, 1:1 + n] = 1
+
+    result = match_template(image, template)
+
+    # get the max and min results.
+    sorted_result = np.argsort(result.flat)
+    iflat_min = sorted_result[0]
+    iflat_max = sorted_result[-1]
+    min_result = np.unravel_index(iflat_min, result.shape)
+    max_result = np.unravel_index(iflat_max, result.shape)
+
+    # shift result by 1 because of template border
+    assert np.all((np.array(min_result) + 1) == (ineg, jneg))
+    assert np.all((np.array(max_result) + 1) == (ipos, jpos))
+
+    assert np.allclose(result.flat[iflat_min], -1)
+    assert np.allclose(result.flat[iflat_max], 1)
+
+
+def test_no_nans():
+    """Test that `match_template` doesn't return NaN values.
+
+    When image values are only slightly different, floating-point errors can
+    cause a subtraction inside of a square root to go negative (without an
+    explicit check that was added to `match_template`).
+    """
+    np.random.seed(1)
+    image = 0.5 + 1e-9 * np.random.normal(size=(20, 20))
+    template = np.ones((6, 6))
+    template[:3, :] = 0
+    result = match_template(image, template)
+    assert not np.any(np.isnan(result))
+
+
+def test_switched_arguments():
+    image = np.ones((5, 5))
+    template = np.ones((3, 3))
+    with testing.raises(ValueError):
+        match_template(template, image)
+
+
+def test_pad_input():
+    """Test `match_template` when `pad_input=True`.
+
+    This test places two full templates (one with values lower than the image
+    mean, the other higher) and two half templates, which are on the edges of
+    the image. The two full templates should score the top (positive and
+    negative) matches and the centers of the half templates should score 2nd.
+    """
+    # Float prefactors ensure that image range is between 0 and 1
+    template = 0.5 * diamond(2)
+    image = 0.5 * np.ones((9, 19))
+    mid = slice(2, 7)
+    image[mid, :3] -= template[:, -3:]  # half min template centered at 0
+    image[mid, 4:9] += template         # full max template centered at 6
+    image[mid, -9:-4] -= template       # full min template centered at 12
+    image[mid, -3:] += template[:, :3]  # half max template centered at 18
+
+    result = match_template(image, template, pad_input=True,
+                            constant_values=image.mean())
+
+    # get the max and min results.
+    sorted_result = np.argsort(result.flat)
+    i, j = np.unravel_index(sorted_result[:2], result.shape)
+    assert_equal(j, (12, 0))
+    i, j = np.unravel_index(sorted_result[-2:], result.shape)
+    assert_equal(j, (18, 6))
+
+
+def test_3d():
+    np.random.seed(1)
+    template = np.random.rand(3, 3, 3)
+    image = np.zeros((12, 12, 12))
+
+    image[3:6, 5:8, 4:7] = template
+
+    result = match_template(image, template)
+
+    assert_equal(result.shape, (10, 10, 10))
+    assert_equal(np.unravel_index(result.argmax(), result.shape), (3, 5, 4))
+
+
+def test_3d_pad_input():
+    np.random.seed(1)
+    template = np.random.rand(3, 3, 3)
+    image = np.zeros((12, 12, 12))
+
+    image[3:6, 5:8, 4:7] = template
+
+    result = match_template(image, template, pad_input=True)
+
+    assert_equal(result.shape, (12, 12, 12))
+    assert_equal(np.unravel_index(result.argmax(), result.shape), (4, 6, 5))
+
+
+def test_padding_reflect():
+    template = diamond(2)
+    image = np.zeros((10, 10))
+    image[2:7, :3] = template[:, -3:]
+
+    result = match_template(image, template, pad_input=True,
+                            mode='reflect')
+
+    assert_equal(np.unravel_index(result.argmax(), result.shape), (4, 0))
+
+
+def test_wrong_input():
+    image = np.ones((5, 5, 1))
+    template = np.ones((3, 3))
+    with testing.raises(ValueError):
+        match_template(template, image)
+
+    image = np.ones((5, 5))
+    template = np.ones((3, 3, 2))
+    with testing.raises(ValueError):
+        match_template(template, image)
+
+    image = np.ones((5, 5, 3, 3))
+    template = np.ones((3, 3, 2))
+    with testing.raises(ValueError):
+        match_template(template, image)
+
+
+def test_bounding_values():
+    image = img_as_float(data.page())
+    template = np.zeros((3, 3))
+    template[1, 1] = 1
+    result = match_template(img_as_float(data.page()), template)
+    print(result.max())
+    assert result.max() < 1 + 1e-7
+    assert result.min() > -1 - 1e-7

venv/Lib/site-packages/skimage/feature/tests/test_texture.py

@@ -0,0 +1,294 @@
+import numpy as np
+from skimage.feature import (greycomatrix,
+                             greycoprops,
+                             local_binary_pattern,
+                             multiblock_lbp)
+from skimage._shared.testing import test_parallel
+from skimage.transform import integral_image
+from skimage._shared import testing
+
+
+class TestGLCM():
+
+    def setup(self):
+        self.image = np.array([[0, 0, 1, 1],
+                               [0, 0, 1, 1],
+                               [0, 2, 2, 2],
+                               [2, 2, 3, 3]], dtype=np.uint8)
+
+    @test_parallel()
+    def test_output_angles(self):
+        result = greycomatrix(self.image, [1], [0, np.pi / 4, np.pi / 2, 3 * np.pi / 4], 4)
+        assert result.shape == (4, 4, 1, 4)
+        expected1 = np.array([[2, 2, 1, 0],
+                             [0, 2, 0, 0],
+                             [0, 0, 3, 1],
+                             [0, 0, 0, 1]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 0], expected1)
+        expected2 = np.array([[1, 1, 3, 0],
+                             [0, 1, 1, 0],
+                             [0, 0, 0, 2],
+                             [0, 0, 0, 0]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 1], expected2)
+        expected3 = np.array([[3, 0, 2, 0],
+                             [0, 2, 2, 0],
+                             [0, 0, 1, 2],
+                             [0, 0, 0, 0]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 2], expected3)
+        expected4 = np.array([[2, 0, 0, 0],
+                             [1, 1, 2, 0],
+                             [0, 0, 2, 1],
+                             [0, 0, 0, 0]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 3], expected4)
+
+    def test_output_symmetric_1(self):
+        result = greycomatrix(self.image, [1], [np.pi / 2], 4,
+                              symmetric=True)
+        assert result.shape == (4, 4, 1, 1)
+        expected = np.array([[6, 0, 2, 0],
+                             [0, 4, 2, 0],
+                             [2, 2, 2, 2],
+                             [0, 0, 2, 0]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 0], expected)
+
+    def test_error_raise_float(self):
+        for dtype in [np.float, np.double, np.float16, np.float32, np.float64]:
+            with testing.raises(ValueError):
+                greycomatrix(self.image.astype(dtype), [1], [np.pi], 4)
+
+    def test_error_raise_int_types(self):
+        for dtype in [np.int16, np.int32, np.int64, np.uint16, np.uint32, np.uint64]:
+            with testing.raises(ValueError):
+                greycomatrix(self.image.astype(dtype), [1], [np.pi])
+
+    def test_error_raise_negative(self):
+        with testing.raises(ValueError):
+            greycomatrix(self.image.astype(np.int16) - 1, [1], [np.pi], 4)
+
+    def test_error_raise_levels_smaller_max(self):
+        with testing.raises(ValueError):
+            greycomatrix(self.image - 1, [1], [np.pi], 3)
+
+    def test_image_data_types(self):
+        for dtype in [np.uint16, np.uint32, np.uint64, np.int16, np.int32, np.int64]:
+            img = self.image.astype(dtype)
+            result = greycomatrix(img, [1], [np.pi / 2], 4,
+                                  symmetric=True)
+            assert result.shape == (4, 4, 1, 1)
+            expected = np.array([[6, 0, 2, 0],
+                                 [0, 4, 2, 0],
+                                 [2, 2, 2, 2],
+                                 [0, 0, 2, 0]], dtype=np.uint32)
+            np.testing.assert_array_equal(result[:, :, 0, 0], expected)
+
+        return
+
+    def test_output_distance(self):
+        im = np.array([[0, 0, 0, 0],
+                       [1, 0, 0, 1],
+                       [2, 0, 0, 2],
+                       [3, 0, 0, 3]], dtype=np.uint8)
+        result = greycomatrix(im, [3], [0], 4, symmetric=False)
+        expected = np.array([[1, 0, 0, 0],
+                             [0, 1, 0, 0],
+                             [0, 0, 1, 0],
+                             [0, 0, 0, 1]], dtype=np.uint32)
+        np.testing.assert_array_equal(result[:, :, 0, 0], expected)
+
+    def test_output_combo(self):
+        im = np.array([[0],
+                       [1],
+                       [2],
+                       [3]], dtype=np.uint8)
+        result = greycomatrix(im, [1, 2], [0, np.pi / 2], 4)
+        assert result.shape == (4, 4, 2, 2)
+
+        z = np.zeros((4, 4), dtype=np.uint32)
+        e1 = np.array([[0, 1, 0, 0],
+                       [0, 0, 1, 0],
+                       [0, 0, 0, 1],
+                       [0, 0, 0, 0]], dtype=np.uint32)
+        e2 = np.array([[0, 0, 1, 0],
+                       [0, 0, 0, 1],
+                       [0, 0, 0, 0],
+                       [0, 0, 0, 0]], dtype=np.uint32)
+
+        np.testing.assert_array_equal(result[:, :, 0, 0], z)
+        np.testing.assert_array_equal(result[:, :, 1, 0], z)
+        np.testing.assert_array_equal(result[:, :, 0, 1], e1)
+        np.testing.assert_array_equal(result[:, :, 1, 1], e2)
+
+    def test_output_empty(self):
+        result = greycomatrix(self.image, [10], [0], 4)
+        np.testing.assert_array_equal(result[:, :, 0, 0],
+                                      np.zeros((4, 4), dtype=np.uint32))
+        result = greycomatrix(self.image, [10], [0], 4, normed=True)
+        np.testing.assert_array_equal(result[:, :, 0, 0],
+                                      np.zeros((4, 4), dtype=np.uint32))
+
+    def test_normed_symmetric(self):
+        result = greycomatrix(self.image, [1, 2, 3],
+                              [0, np.pi / 2, np.pi], 4,
+                              normed=True, symmetric=True)
+        for d in range(result.shape[2]):
+            for a in range(result.shape[3]):
+                np.testing.assert_almost_equal(result[:, :, d, a].sum(),
+                                               1.0)
+                np.testing.assert_array_equal(result[:, :, d, a],
+                                              result[:, :, d, a].transpose())
+
+    def test_contrast(self):
+        result = greycomatrix(self.image, [1, 2], [0], 4,
+                              normed=True, symmetric=True)
+        result = np.round(result, 3)
+        contrast = greycoprops(result, 'contrast')
+        np.testing.assert_almost_equal(contrast[0, 0], 0.585, decimal=3)
+
+    def test_dissimilarity(self):
+        result = greycomatrix(self.image, [1], [0, np.pi / 2], 4,
+                              normed=True, symmetric=True)
+        result = np.round(result, 3)
+        dissimilarity = greycoprops(result, 'dissimilarity')
+        np.testing.assert_almost_equal(dissimilarity[0, 0], 0.418, decimal=3)
+
+    def test_dissimilarity_2(self):
+        result = greycomatrix(self.image, [1, 3], [np.pi / 2], 4,
+                              normed=True, symmetric=True)
+        result = np.round(result, 3)
+        dissimilarity = greycoprops(result, 'dissimilarity')[0, 0]
+        np.testing.assert_almost_equal(dissimilarity, 0.665, decimal=3)
+
+    def test_non_normalized_glcm(self):
+        img = (np.random.random((100, 100)) * 8).astype(np.uint8)
+        p = greycomatrix(img, [1, 2, 4, 5], [0, 0.25, 1, 1.5], levels=8)
+        np.testing.assert_(np.max(greycoprops(p, 'correlation')) < 1.0)
+
+    def test_invalid_property(self):
+        result = greycomatrix(self.image, [1], [0], 4)
+        with testing.raises(ValueError):
+            greycoprops(result, 'ABC')
+
+    def test_homogeneity(self):
+        result = greycomatrix(self.image, [1], [0, 6], 4, normed=True,
+                              symmetric=True)
+        homogeneity = greycoprops(result, 'homogeneity')[0, 0]
+        np.testing.assert_almost_equal(homogeneity, 0.80833333)
+
+    def test_energy(self):
+        result = greycomatrix(self.image, [1], [0, 4], 4, normed=True,
+                              symmetric=True)
+        energy = greycoprops(result, 'energy')[0, 0]
+        np.testing.assert_almost_equal(energy, 0.38188131)
+
+    def test_correlation(self):
+        result = greycomatrix(self.image, [1, 2], [0], 4, normed=True,
+                              symmetric=True)
+        energy = greycoprops(result, 'correlation')
+        np.testing.assert_almost_equal(energy[0, 0], 0.71953255)
+        np.testing.assert_almost_equal(energy[1, 0], 0.41176470)
+
+    def test_uniform_properties(self):
+        im = np.ones((4, 4), dtype=np.uint8)
+        result = greycomatrix(im, [1, 2, 8], [0, np.pi / 2], 4, normed=True,
+                              symmetric=True)
+        for prop in ['contrast', 'dissimilarity', 'homogeneity',
+                     'energy', 'correlation', 'ASM']:
+            greycoprops(result, prop)
+
+
+class TestLBP():
+
+    def setup(self):
+        self.image = np.array([[255,   6, 255,   0,  141,   0],
+                               [ 48, 250, 204, 166,  223,  63],
+                               [  8,   0, 159,  50,  255,  30],
+                               [167, 255,  63,  40,  128, 255],
+                               [  0, 255,  30,  34,  255,  24],
+                               [146, 241, 255,   0,  189, 126]], dtype='double')
+
+    @test_parallel()
+    def test_default(self):
+        lbp = local_binary_pattern(self.image, 8, 1, 'default')
+        ref = np.array([[  0, 251,   0, 255,  96, 255],
+                        [143,   0,  20, 153,  64,  56],
+                        [238, 255,  12, 191,   0, 252],
+                        [129,  64.,  62, 159, 199,   0],
+                        [255,   4, 255, 175,   0, 254],
+                        [  3,   5,   0, 255,   4,  24]])
+        np.testing.assert_array_equal(lbp, ref)
+
+    def test_ror(self):
+        lbp = local_binary_pattern(self.image, 8, 1, 'ror')
+        ref = np.array([[  0, 127,   0, 255,   3, 255],
+                        [ 31,   0,   5,  51,   1,   7],
+                        [119, 255,   3, 127,   0,  63],
+                        [  3,   1,  31,  63,  31,   0],
+                        [255,   1, 255,  95,   0, 127],
+                        [  3,   5,   0, 255,   1,   3]])
+        np.testing.assert_array_equal(lbp, ref)
+
+    def test_uniform(self):
+        lbp = local_binary_pattern(self.image, 8, 1, 'uniform')
+        ref = np.array([[0, 7, 0, 8, 2, 8],
+                        [5, 0, 9, 9, 1, 3],
+                        [9, 8, 2, 7, 0, 6],
+                        [2, 1, 5, 6, 5, 0],
+                        [8, 1, 8, 9, 0, 7],
+                        [2, 9, 0, 8, 1, 2]])
+        np.testing.assert_array_equal(lbp, ref)
+
+    def test_var(self):
+        # Test idea: mean of variance is estimate of overall variance.
+
+        # Fix random seed for test stability.
+        np.random.seed(13141516)
+
+        # Create random image with known variance.
+        image = np.random.rand(500, 500)
+        target_std = 0.3
+        image = image / image.std() * target_std
+
+        # Use P=4 to avoid interpolation effects
+        P, R = 4, 1
+        lbp = local_binary_pattern(image, P, R, 'var')
+
+        # Take central part to avoid border effect.
+        lbp = lbp[5:-5, 5:-5]
+
+        # The LBP variance is biased (ddof=0), correct for that.
+        expected = target_std**2 * (P-1)/P
+
+        np.testing.assert_almost_equal(lbp.mean(), expected, 4)
+
+    def test_nri_uniform(self):
+        lbp = local_binary_pattern(self.image, 8, 1, 'nri_uniform')
+        ref = np.array([[ 0, 54,  0, 57, 12, 57],
+                        [34,  0, 58, 58,  3, 22],
+                        [58, 57, 15, 50,  0, 47],
+                        [10,  3, 40, 42, 35,  0],
+                        [57,  7, 57, 58,  0, 56],
+                        [ 9, 58,  0, 57,  7, 14]])
+        np.testing.assert_array_almost_equal(lbp, ref)
+
+
+class TestMBLBP():
+
+    def test_single_mblbp(self):
+
+        # Create dummy matrix where first and fifth rectangles have greater
+        # value than the central one. Therefore, the following bits
+        # should be 1.
+        test_img = np.zeros((9, 9), dtype='uint8')
+        test_img[3:6, 3:6] = 1
+        test_img[:3, :3] = 255
+        test_img[6:, 6:] = 255
+
+        # MB-LBP is filled in reverse order. So the first and fifth bits from
+        # the end should be filled.
+        correct_answer = 0b10001000
+
+        int_img = integral_image(test_img)
+
+        lbp_code = multiblock_lbp(int_img, 0, 0, 3, 3)
+
+        np.testing.assert_equal(lbp_code, correct_answer)

venv/Lib/site-packages/skimage/feature/tests/test_util.py

@@ -0,0 +1,81 @@
+import numpy as np
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
+
+from skimage._shared.testing import assert_equal
+
+from skimage.feature.util import (FeatureDetector, DescriptorExtractor,
+                                  _prepare_grayscale_input_2D,
+                                  _mask_border_keypoints, plot_matches)
+
+from skimage._shared import testing
+
+
+def test_feature_detector():
+    with testing.raises(NotImplementedError):
+        FeatureDetector().detect(None)
+
+
+def test_descriptor_extractor():
+    with testing.raises(NotImplementedError):
+        DescriptorExtractor().extract(None, None)
+
+
+def test_prepare_grayscale_input_2D():
+    with testing.raises(ValueError):
+        _prepare_grayscale_input_2D(np.zeros((3, 3, 3)))
+    with testing.raises(ValueError):
+        _prepare_grayscale_input_2D(np.zeros((3, 1)))
+    with testing.raises(ValueError):
+        _prepare_grayscale_input_2D(np.zeros((3, 1, 1)))
+    img = _prepare_grayscale_input_2D(np.zeros((3, 3)))
+    img = _prepare_grayscale_input_2D(np.zeros((3, 3, 1)))
+    img = _prepare_grayscale_input_2D(np.zeros((1, 3, 3)))
+
+
+def test_mask_border_keypoints():
+    keypoints = np.array([[0, 0], [1, 1], [2, 2], [3, 3], [4, 4]])
+    assert_equal(_mask_border_keypoints((10, 10), keypoints, 0),
+                 [1, 1, 1, 1, 1])
+    assert_equal(_mask_border_keypoints((10, 10), keypoints, 2),
+                 [0, 0, 1, 1, 1])
+    assert_equal(_mask_border_keypoints((4, 4), keypoints, 2),
+                 [0, 0, 1, 0, 0])
+    assert_equal(_mask_border_keypoints((10, 10), keypoints, 5),
+                 [0, 0, 0, 0, 0])
+    assert_equal(_mask_border_keypoints((10, 10), keypoints, 4),
+                 [0, 0, 0, 0, 1])
+
+
+@testing.skipif(plt is None, reason="Matplotlib not installed")
+def test_plot_matches():
+    fig, ax = plt.subplots(nrows=1, ncols=1)
+
+    shapes = (((10, 10), (10, 10)),
+              ((10, 10), (12, 10)),
+              ((10, 10), (10, 12)),
+              ((10, 10), (12, 12)),
+              ((12, 10), (10, 10)),
+              ((10, 12), (10, 10)),
+              ((12, 12), (10, 10)))
+
+    keypoints1 = 10 * np.random.rand(10, 2)
+    keypoints2 = 10 * np.random.rand(10, 2)
+    idxs1 = np.random.randint(10, size=10)
+    idxs2 = np.random.randint(10, size=10)
+    matches = np.column_stack((idxs1, idxs2))
+
+    for shape1, shape2 in shapes:
+        img1 = np.zeros(shape1)
+        img2 = np.zeros(shape2)
+        plot_matches(ax, img1, img2, keypoints1, keypoints2, matches)
+        plot_matches(ax, img1, img2, keypoints1, keypoints2, matches,
+                     only_matches=True)
+        plot_matches(ax, img1, img2, keypoints1, keypoints2, matches,
+                     keypoints_color='r')
+        plot_matches(ax, img1, img2, keypoints1, keypoints2, matches,
+                     matches_color='r')
+        plot_matches(ax, img1, img2, keypoints1, keypoints2, matches,
+                     alignment='vertical')