Using gpu::BroxOpticalFlow, assertion failed

asked 2013-04-16 19:11:58 -0500

paul gravatar image

Hi,

I am trying to run gpu::BroxOpticalFlow on some images. I get an assertion error:

OpenCV Error: Assertion failed (_rows >= 0 && _cols >= 0) in unknown function, file ..\..\opencv-2.4\modules\core\src\gpumat.cpp, line 1525

Here's my code snippet:

int main() 
{ 
    cv::Mat img1;
    cv::Mat img2;
    img1 = imread("1.png", CV_LOAD_IMAGE_GRAYSCALE);
    img2 = imread("2.png", CV_LOAD_IMAGE_GRAYSCALE);
    namedWindow( "window1", CV_WINDOW_AUTOSIZE );
    imshow( "window1", img1 );
    namedWindow( "window2", CV_WINDOW_AUTOSIZE );
    imshow( "window2", img2 );

    img1.convertTo(img1, CV_32FC1);
    img2.convertTo(img2, CV_32FC1);

    cv::gpu::GpuMat img1gpu(img1);
    cv::gpu::GpuMat img2gpu(img2);

    cv::gpu::GpuMat FlowXGPU;
    cv::gpu::GpuMat FlowYGPU;

    cv::gpu::BroxOpticalFlow OpticalFlowGPU = cv::gpu::BroxOpticalFlow(0.197f, 0.8f, 50.0f, 10, 77, 10);

    OpticalFlowGPU(img1gpu, img2gpu, FlowXGPU, FlowYGPU);

    cv::Mat FlowX;
    cv::Mat FlowY;
    FlowXGPU.download(FlowX);
    FlowYGPU.download(FlowY);

    waitKey(0);
}

The usage of the Brox function is the same as in a post here: http://stackoverflow.com/questions/15069255/opencv-brox-optical-flow-exception-in-opencv-core244dcvglbufferunbind. I just wanted to see if it works.

I'm pretty sure this has to do with the sizes of FlowXGPU and FlowYGPU... I'm very new to OpenCV and would really appreciate some advice.

Thank you.

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Comments

1

For future reference :). The cause of the error was the scale parameter (50.0f). Obviously, a scale parameter this big fills up the GPU memory in no time. I will just go ahead now and let the poster in the above link know.

paul gravatar imagepaul ( 2013-04-16 20:01:59 -0500 )edit