python调用摄像头

import cv2

capture = cv2.VideoCapture(0)
while(1)
  ret, frame = capture.read()
  print frame.shape[0], frame.shape[1]
  cv2.imshow("results", frame)
  c = cv2.waitKey(5) & 0xff
  if c == 27:
     cv2.destroyAllWindows()
     capture.release()
     break;