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I using visual studio 2010 with gpu opencv library.When I am using function GMG of GPU opencv library,it give me only blank output.But the normal opencv library give me correct ouput.

using namespace cv;

 int main()  
{  
Mat fgMaskGMG;

Mat frame;

gpu::GpuMat GPU_fgMaskGMG;

gpu::GpuMat GPU_frame;

    gpu::setDevice(0);

    VideoCapture stream1(0);       
    stream1.open(0);

    while (true) {    

        stream1.read(frame);
        if(!(stream1.read(frame)))     
        break;  

        GPU_frame.upload(frame);


        gpu::GMG_GPU::GMG_GPU();
        gpu::GMG_GPU GMG;
        GMG(GPU_frame,GPU_fgMaskGMG,0.03);

        GPU_fgMaskGMG.download(fgMaskGMG);

        imshow("Origin", frame); 
        imshow("GMG", fgMaskGMG);

        switch(waitKey(10)){
            case 27: 
            return 0;
        }
    }
}