python+opencv链接摄像头

 1 import cv2
 2 import numpy as numpy
 3 cap=cv2.VideoCapture(0)
 4 #设置显示分辨率和FPS ,不设置的话会非常卡
 5 cap.set(cv2.CAP_PROP_FRAME_WIDTH,800)
 6 cap.set(cv2.CAP_PROP_FRAME_HEIGHT,600)
 7 cap.set (cv2.CAP_PROP_FPS,20)
 8 while cap.isOpened():
 9 ret,frame=cap.read()
10 # cv2.flip(frame,frame,1)
11 # frame1=None
12 # cv2.flip(frame,frame1,1)
13 #图像水平翻转
14 frame=cv2.flip(frame,1)
15 # gray=cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
16 
17 cv2.imshow('camare',frame)
18 #按Q键退出
19 if cv2.waitKey(1) & 0xFF==ord('q'):
20 break
21 #释放摄像头和卸载窗口
22 cap.release()
23 cv2.destroyAllWindows()