Python Opencv Camera Show

camera_demo.py

import cv2

def run_demo(mirror=False):
	cam = cv2.VideoCapture(0)
	cam.set(3, 640)
	cam.set(4, 480)
	key = 0
	while True:
		# read frame
		ret_val, img = cam.read()
		if mirror: 
			img = cv2.flip(img, 1)

		cv2.imshow('my webcam', img)
		key = cv2.waitKey(1)
		if key == 27: 
			break
	cv2.destroyAllWindows()

def main():
	run_demo(mirror=True)

if __name__ == '__main__':
	main()