python+opencv链接摄像头

 import cv2
 import numpy as numpy
 cap=cv2.VideoCapture(0)
 #设置显示分辨率和FPS ,不设置的话会非常卡
 cap.set(cv2.CAP_PROP_FRAME_WIDTH,800)
 cap.set(cv2.CAP_PROP_FRAME_HEIGHT,600)
 cap.set (cv2.CAP_PROP_FPS,20)
 while cap.isOpened():
 ret,frame=cap.read()
 # cv2.flip(frame,frame,1)
 # frame1=None
 # cv2.flip(frame,frame1,1)
 #图像水平翻转
 frame=cv2.flip(frame,1)
 # gray=cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
 
 cv2.imshow('camare',frame)
 #按Q键退出
 if cv2.waitKey(1) & 0xFF==ord('q'):
 break
 #释放摄像头和卸载窗口
 cap.release()
 cv2.destroyAllWindows()