30 lines
1.2 KiB
Python
30 lines
1.2 KiB
Python
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)
|