OpenCV不会从MacBook Pro iSight中捕获

Question

几天后,我无法再从opencv应用程序中打开我的iSight摄像头了.cap = cv2.VideoCapture(0)返回并cap.isOpened()返回true.但是,cap.grab()只需返回false.有任何想法吗？

示例代码:

import cv2

cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)
rval = True

while rval:
    rval, frame = vc.read()
    cv2.imshow("preview", frame)

    key = cv2.waitKey(20)
    if key == 27: # exit on ESC
        break

• Mac OS 10.8.5
• Python 2.7.5(但也不能在C++应用程序内部工作)
• OpenCV 2.4.6.1

Answer 1

这就是我让相机为您的代码工作的方式(在OSX 10.6上):

import cv2

cv2.namedWindow("preview")
vc = cv2.VideoCapture(0)

rval, frame = vc.read()

while True:

  if frame is not None:   
     cv2.imshow("preview", frame)
  rval, frame = vc.read()

  if cv2.waitKey(1) & 0xFF == ord('q'):
     break