python使用opencv驱动摄像头的方法

#coding:utf-8
 
import cv2
import sys
from PIL import Image
 
 
def CatchUsbVideo(window_name, camera_idx):
 cv2.namedWindow(window_name)
 
 # 捕捉摄像头
 cap = cv2.VideoCapture(camera_idx)
 
 while cap.isOpened():
  ok, frame = cap.read() # 读取一帧数据
  if not ok:
   break
  # 显示图像
  cv2.imshow(window_name, frame)
  c = cv2.waitKey(10)
  if c & 0xFF == ord('q'):
   break
 
   # 释放摄像头并销毁所有窗口
 cap.release()
 cv2.destroyAllWindows()
 
 
if __name__ == '__main__':
 CatchUsbVideo("FaceRect", 0)