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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 as cv
import numpy as np
# relative module
import video
# built-in module
import sys
def main():
try:
fn = sys.argv[1]
except:
fn = 0
def nothing(*arg):
pass
cv.namedWindow('edge')
cv.createTrackbar('thrs1', 'edge', 2000, 5000, nothing)
cv.createTrackbar('thrs2', 'edge', 4000, 5000, nothing)
cap = video.create_capture(fn)
while True:
_flag, img = cap.read()
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
thrs1 = cv.getTrackbarPos('thrs1', 'edge')
thrs2 = cv.getTrackbarPos('thrs2', 'edge')
edge = cv.Canny(gray, thrs1, thrs2, apertureSize=5)
vis = img.copy()
vis = np.uint8(vis/2.)
vis[edge != 0] = (0, 255, 0)
cv.imshow('edge', vis)
ch = cv.waitKey(5)
if ch == 27:
break
print('Done')
if __name__ == '__main__':
print(__doc__)
main()
cv.destroyAllWindows()
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