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I am trying to use opencl in opencv 3.1.0 , I copy some of the code in tutorials. However, my computer always shows " Display Driver Stopped Responding " message and crash.

and there are my code:

    VideoCapture cap(0); // open the default camera         

    UMat edges;
    UMat fgMaskMOG2;
    Ptr<BackgroundSubtractor> pMOG2;

    pMOG2 = createBackgroundSubtractorMOG2(500, 20.0, false);

    for (;;)
    {

         UMat frame;
         UMat frame2 = frame.clone();
        cap >> frame; // get a new frame from camera
        cvtColor(frame, edges, COLOR_BGR2GRAY);
        GaussianBlur(edges, edges, cv::Size(7, 7), 1.5, 1.5);
    //  Canny(edges, edges, 0, 30, 3);   // The program always crashes here and shows " Display Driver Stopped Responding "
        pMOG2->apply(frame, fgMaskMOG2);
        imshow("edges", edges);
        imshow("edges2", frame);
        imshow("FG Mask MOG 2", fgMaskMOG2);

        if (waitKey(30) >= 0) break;
    }

I think in opencv3.1.0, If I want to use gpu, all I need to do is change "Mat" into "UMat", the code work fine if there is no Canny , How should I do to use Canny if I want to use opencl in opencv? Thanks for your help and sorry for my poor English.