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()