Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/skimage/transform/tests/test_pyramids.py

@@ -0,0 +1,147 @@
+import math
+import pytest
+import numpy as np
+from skimage import data
+from skimage.transform import pyramids
+
+from skimage._shared import testing
+from skimage._shared.testing import (assert_array_equal, assert_, assert_equal,
+                                     assert_almost_equal)
+
+
+image = data.astronaut()
+image_gray = image[..., 0]
+
+
+def test_pyramid_reduce_rgb():
+    rows, cols, dim = image.shape
+    out = pyramids.pyramid_reduce(image, downscale=2, multichannel=True)
+    assert_array_equal(out.shape, (rows / 2, cols / 2, dim))
+
+
+def test_pyramid_reduce_gray():
+    rows, cols = image_gray.shape
+    out1 = pyramids.pyramid_reduce(image_gray, downscale=2,
+                                   multichannel=False)
+    assert_array_equal(out1.shape, (rows / 2, cols / 2))
+    assert_almost_equal(out1.ptp(), 1.0, decimal=2)
+    out2 = pyramids.pyramid_reduce(image_gray, downscale=2,
+                                   multichannel=False, preserve_range=True)
+    assert_almost_equal(out2.ptp() / image_gray.ptp(), 1.0, decimal=2)
+
+
+def test_pyramid_reduce_nd():
+    for ndim in [1, 2, 3, 4]:
+        img = np.random.randn(*((8, ) * ndim))
+        out = pyramids.pyramid_reduce(img, downscale=2,
+                                      multichannel=False)
+        expected_shape = np.asarray(img.shape) / 2
+        assert_array_equal(out.shape, expected_shape)
+
+
+def test_pyramid_expand_rgb():
+    rows, cols, dim = image.shape
+    out = pyramids.pyramid_expand(image, upscale=2,
+                                  multichannel=True)
+    assert_array_equal(out.shape, (rows * 2, cols * 2, dim))
+
+
+def test_pyramid_expand_gray():
+    rows, cols = image_gray.shape
+    out = pyramids.pyramid_expand(image_gray, upscale=2,
+                                  multichannel=False)
+    assert_array_equal(out.shape, (rows * 2, cols * 2))
+
+
+def test_pyramid_expand_nd():
+    for ndim in [1, 2, 3, 4]:
+        img = np.random.randn(*((4, ) * ndim))
+        out = pyramids.pyramid_expand(img, upscale=2,
+                                      multichannel=False)
+        expected_shape = np.asarray(img.shape) * 2
+        assert_array_equal(out.shape, expected_shape)
+
+
+def test_build_gaussian_pyramid_rgb():
+    rows, cols, dim = image.shape
+    pyramid = pyramids.pyramid_gaussian(image, downscale=2,
+                                        multichannel=True)
+    for layer, out in enumerate(pyramid):
+        layer_shape = (rows / 2 ** layer, cols / 2 ** layer, dim)
+        assert_array_equal(out.shape, layer_shape)
+
+
+def test_build_gaussian_pyramid_gray():
+    rows, cols = image_gray.shape
+    pyramid = pyramids.pyramid_gaussian(image_gray, downscale=2,
+                                        multichannel=False)
+    for layer, out in enumerate(pyramid):
+        layer_shape = (rows / 2 ** layer, cols / 2 ** layer)
+        assert_array_equal(out.shape, layer_shape)
+
+
+def test_build_gaussian_pyramid_nd():
+    for ndim in [1, 2, 3, 4]:
+        img = np.random.randn(*((8, ) * ndim))
+        original_shape = np.asarray(img.shape)
+        pyramid = pyramids.pyramid_gaussian(img, downscale=2,
+                                            multichannel=False)
+        for layer, out in enumerate(pyramid):
+            layer_shape = original_shape / 2 ** layer
+            assert_array_equal(out.shape, layer_shape)
+
+
+def test_build_laplacian_pyramid_rgb():
+    rows, cols, dim = image.shape
+    pyramid = pyramids.pyramid_laplacian(image, downscale=2,
+                                         multichannel=True)
+    for layer, out in enumerate(pyramid):
+        layer_shape = (rows / 2 ** layer, cols / 2 ** layer, dim)
+        assert_array_equal(out.shape, layer_shape)
+
+
+def test_build_laplacian_pyramid_nd():
+    for ndim in [1, 2, 3, 4]:
+        img = np.random.randn(*(16, )*ndim)
+        original_shape = np.asarray(img.shape)
+        pyramid = pyramids.pyramid_laplacian(img, downscale=2,
+                                             multichannel=False)
+        for layer, out in enumerate(pyramid):
+            print(out.shape)
+            layer_shape = original_shape / 2 ** layer
+            assert_array_equal(out.shape, layer_shape)
+
+
+def test_laplacian_pyramid_max_layers():
+    for downscale in [2, 3, 5, 7]:
+        img = np.random.randn(32, 8)
+        pyramid = pyramids.pyramid_laplacian(img, downscale=downscale,
+                                             multichannel=False)
+        max_layer = int(np.ceil(math.log(np.max(img.shape), downscale)))
+        for layer, out in enumerate(pyramid):
+            if layer < max_layer:
+                # should not reach all axes as size 1 prior to final level
+                assert_(np.max(out.shape) > 1)
+
+        # total number of images is max_layer + 1
+        assert_equal(max_layer, layer)
+
+        # final layer should be size 1 on all axes
+        assert_array_equal((out.shape), (1, 1))
+
+
+def test_check_factor():
+    with testing.raises(ValueError):
+        pyramids._check_factor(0.99)
+    with testing.raises(ValueError):
+        pyramids._check_factor(- 2)
+
+
+@pytest.mark.parametrize('dtype, expected',
+                         zip(['float32', 'float64', 'uint8', 'int64'],
+                             ['float32', 'float64', 'float64', 'float64']))
+def test_pyramid_gaussian_dtype_support(dtype, expected):
+    img = np.random.randn(32, 8).astype(dtype)
+    pyramid = pyramids.pyramid_gaussian(img)
+
+    assert np.all([im.dtype == expected for im in pyramid])