树莓派使用USB拍摄代码

#encoding=utf-8
import cv2
clicked = False
def onMouse(event,x,y,flags,param):
    global clicked
    if event == cv2.EVENT_LBUTTONUP:
        clicked = True
        pass
# cameraCapture = cv2.VideoCapture(0) 
#USB
cameraCapture = cv2.VideoCapture(0)
cv2.namedWindow('my_window')
cv2.setMouseCallback('my_window',onMouse)
print('showing camera feed.click window or press any key to stop')
success, frame = cameraCapture.read()
while True:
    cv2.imshow('my_window',frame)
    success, frame = cameraCapture.read()
    if success and cv2.waitKey(1) == -1 and not clicked :
        pass
    else:
        file_name = "/home/pi/Desktop/test.jpg"
        cv2.imwrite(file_name,frame)
        break
    pass
cv2.destroyWindow('my_window')
cameraCapture.release()

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