opencv 摄像头

    VideoCapture cap();

    if(!cap.isOpened())

        return -;

    Mat frame, edges;

    namedWindow("edges",);

    for(;;)

    {

        cap >> frame;

        cvtColor(frame, edges, CV_BGR2GRAY);

        GaussianBlur(edges, edges, Size(,), 1.5, 1.5);

        Canny(edges, edges, , , );

        imshow("edges", edges);

        if(waitKey() >= ) break;

    }