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- #!/usr/bin/env python
- '''
- This sample demonstrates Canny edge detection.
- Usage:
- edge.py [<video source>]
- Trackbars control edge thresholds.
- '''
- # Python 2/3 compatibility
- from __future__ import print_function
- import cv2
- import numpy as np
- # relative module
- import video
- # built-in module
- import sys
- if __name__ == '__main__':
- print(__doc__)
- try:
- fn = sys.argv[1]
- except:
- fn = 0
- def nothing(*arg):
- pass
- cv2.namedWindow('edge')
- cv2.createTrackbar('thrs1', 'edge', 2000, 5000, nothing)
- cv2.createTrackbar('thrs2', 'edge', 4000, 5000, nothing)
- cap = video.create_capture(fn)
- while True:
- flag, img = cap.read()
- gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
- thrs1 = cv2.getTrackbarPos('thrs1', 'edge')
- thrs2 = cv2.getTrackbarPos('thrs2', 'edge')
- edge = cv2.Canny(gray, thrs1, thrs2, apertureSize=5)
- vis = img.copy()
- vis = np.uint8(vis/2.)
- vis[edge != 0] = (0, 255, 0)
- cv2.imshow('edge', vis)
- ch = cv2.waitKey(5) & 0xFF
- if ch == 27:
- break
- cv2.destroyAllWindows()
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