import cv2
cap = cv2.VideoCapture(0)
cap.set(3,640)
cap.set(4,480)
while True:
ret,frame = cap.read()
# frame = cv2.flip(frame,-1)#旋转屏幕
gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
cv2.imshow('frame',frame)
cv2.imshow('gray',gray)
k = cv2.waitKey(30) & 0xff
if k == 27:
break
cap.release()
cv2.destroyAllWindows()