python使用opencv驱动摄像头的方法

如下所示：

#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)

来源：https://blog.csdn.net/Jailman/article/details/78428180