如果要拍照，代码如下
#!/usr/local/python3/bin/python3
# -*- coding: utf-8 -*
import cv2
import time
time = time.strftime('%Y-%m-%d-%H-%M-%S', time.localtime(time.time()))
cap = cv2.VideoCapture(0)
while(1):
# get a frame
ret, frame = cap.read()
# show a frame
cv2.imshow("capture", frame)
if cv2.waitKey(1):
cv2.imwrite('./face_photo/photo'+time+'.jpeg', frame)
break
cap.release()
cv2.destroyAllWindows()
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