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