使用python的imdecode opencv慢视频流

Question

我正在使用OpenCV连接到IP摄像头进行物体检测。问题是视频流是超低的。当我评论这个位“rects = detect（灰色，级联）”时，视频流很流畅。

我读到它与imdecode有关，并且每帧将帧转换为灰色但我找不到解决方案，我该如何解决这个问题呢？

bytes=""
while True:
    '''authenticated connection to IP cam'''
    bytes+=stream.read(16384)
    a = bytes.find('\xff\xd8')
    b = bytes.find('\xff\xd9')
    if a!=-1 and b!=-1:
        jpg = bytes[a:b+2]
        bytes= bytes[b+2:]
        i = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8),cv2.CV_LOAD_IMAGE_COLOR)

        '''Convert frames to gray to be able to detect objects'''
        gray = cv2.cvtColor(i, cv2.COLOR_BGR2GRAY)
        gray = cv2.equalizeHist(gray)

        '''Detect and draw whatever you specified in haarcascades'''
        rects = detect(gray, cascade)
        vis = i.copy()
        draw_rects(vis, rects, (0, 255, 0))

        '''Display the videostream'''
        cv2.imshow('authenticated cam',vis)
        if cv2.waitKey(1) ==27:
            exit(0)