79 lines
1.6 KiB
Python
79 lines
1.6 KiB
Python
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#!/usr/bin/env python
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'''
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Distance transform sample.
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Usage:
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distrans.py [<image>]
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Keys:
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ESC - exit
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v - toggle voronoi mode
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'''
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# Python 2/3 compatibility
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from __future__ import print_function
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import numpy as np
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import cv2 as cv
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from common import make_cmap
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def main():
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import sys
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try:
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fn = sys.argv[1]
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except:
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fn = 'fruits.jpg'
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fn = cv.samples.findFile(fn)
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img = cv.imread(fn, cv.IMREAD_GRAYSCALE)
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if img is None:
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print('Failed to load fn:', fn)
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sys.exit(1)
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cm = make_cmap('jet')
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need_update = True
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voronoi = False
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def update(dummy=None):
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global need_update
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need_update = False
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thrs = cv.getTrackbarPos('threshold', 'distrans')
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mark = cv.Canny(img, thrs, 3*thrs)
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dist, labels = cv.distanceTransformWithLabels(~mark, cv.DIST_L2, 5)
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if voronoi:
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vis = cm[np.uint8(labels)]
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else:
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vis = cm[np.uint8(dist*2)]
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vis[mark != 0] = 255
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cv.imshow('distrans', vis)
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def invalidate(dummy=None):
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global need_update
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need_update = True
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cv.namedWindow('distrans')
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cv.createTrackbar('threshold', 'distrans', 60, 255, invalidate)
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update()
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while True:
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ch = cv.waitKey(50)
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if ch == 27:
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break
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if ch == ord('v'):
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voronoi = not voronoi
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print('showing', ['distance', 'voronoi'][voronoi])
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update()
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if need_update:
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update()
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print('Done')
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if __name__ == '__main__':
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print(__doc__)
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main()
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cv.destroyAllWindows()
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