Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/skimage/viewer/plugins/canny.py

@@ -0,0 +1,30 @@
+import numpy as np
+
+import skimage
+from ...feature import canny
+from .overlayplugin import OverlayPlugin
+from ..widgets import Slider, ComboBox
+
+
+class CannyPlugin(OverlayPlugin):
+    """Canny filter plugin to show edges of an image."""
+
+    name = 'Canny Filter'
+
+    def __init__(self, *args, **kwargs):
+        super(CannyPlugin, self).__init__(image_filter=canny, **kwargs)
+
+    def attach(self, image_viewer):
+        image = image_viewer.image
+        imin, imax = skimage.dtype_limits(image, clip_negative=False)
+        itype = 'float' if np.issubdtype(image.dtype, np.floating) else 'int'
+        self.add_widget(Slider('sigma', 0, 5, update_on='release'))
+        self.add_widget(Slider('low threshold', imin, imax, value_type=itype,
+                        update_on='release'))
+        self.add_widget(Slider('high threshold', imin, imax, value_type=itype,
+                        update_on='release'))
+        self.add_widget(ComboBox('color', self.color_names, ptype='plugin'))
+        # Call parent method at end b/c it calls `filter_image`, which needs
+        # the values specified by the widgets. Alternatively, move call to
+        # parent method to beginning and add a call to `self.filter_image()`
+        super(CannyPlugin,self).attach(image_viewer)