python使用opencv驱动摄像头

#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)