mirror of
https://github.com/opencv/opencv.git
synced 2024-12-28 11:58:13 +08:00
2c4bbb313c
Conflicts: cmake/OpenCVConfig.cmake cmake/OpenCVLegacyOptions.cmake modules/contrib/src/retina.cpp modules/gpu/doc/camera_calibration_and_3d_reconstruction.rst modules/gpu/doc/video.rst modules/gpu/src/speckle_filtering.cpp modules/python/src2/cv2.cv.hpp modules/python/test/test2.py samples/python/watershed.py
52 lines
1.0 KiB
Python
Executable File
52 lines
1.0 KiB
Python
Executable File
#!/usr/bin/env python
|
|
|
|
'''
|
|
This sample demonstrates Canny edge detection.
|
|
|
|
Usage:
|
|
edge.py [<video source>]
|
|
|
|
Trackbars control edge thresholds.
|
|
|
|
'''
|
|
|
|
import cv2
|
|
|
|
# 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 /= 2
|
|
vis[edge != 0] = (0, 255, 0)
|
|
cv2.imshow('edge', vis)
|
|
ch = cv2.waitKey(5)
|
|
if ch == 27:
|
|
break
|
|
cv2.destroyAllWindows()
|