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Simple code don't give connected contour. No top or bottom edge instead. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

Simple code don't give connected contour. No top or bottom edge instead. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

Simple code don't give for simple image result is not connected contour. No top contour as it is expected. Top or bottom edge instead. missed. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

I use OpenCV3-beta in Eclipse under Win8.1 and have to build source from git. Due to http://code.opencv.org/issues/4087 I use 4 weeks old source, but last changes in canny.cpp was 7 weeks ago.

Simple code for simple image result is not connected contour as it is expected. Top or bottom edge missed. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

I use OpenCV3-beta in Eclipse under Win8.1 and have to build source from git. Due to http://code.opencv.org/issues/4087 I use 4 weeks old source, but last changes in Source updated and compiled today (last canny.cpp change was 7 weeks ago.ago).

Simple code for simple image result is not connected contour as it is expected. Top or bottom edge missed. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

I use OpenCV3-beta in Eclipse under Win8.1 and have to build source from git. Source updated and compiled today (last canny.cpp change was 7 weeks ago).ago). I do have openCL so I guess UMat Canny function uses OCL_RUN version of function

Simple code for simple image result is not connected contour as it is expected. Top or bottom edge missed. Result printscreen is square-bug.png . The picture itself is square.png. Code is:

   void test(){
        UMat img = imread("./square.png", IMREAD_COLOR).getUMat(ACCESS_READ);
        UMat imgGray, imgGrayEdges3, imgGrayEdges5;
        cvtColor(img, imgGray, CV_BGR2GRAY);
        Canny(imgGray, imgGrayEdges3, 50, 150, 3);
        Canny(imgGray, imgGrayEdges5, 300, 2000, 5); // why so large thresholds?..
        cout << imgGray.getMat(ACCESS_READ) << "\n" << imgGrayEdges3.getMat(ACCESS_READ) << "\n" << imgGrayEdges5.getMat(ACCESS_READ) ;
        imshow("img", img);
        imshow("canny3", imgGrayEdges3);
        imshow("canny5", imgGrayEdges5);
        waitKey();
    }

Am I doing something wrong?

I use OpenCV3-beta in Eclipse under Win8.1 and have to build source from git. Source updated and compiled today (last canny.cpp change was 7 weeks ago). I do have openCL so I guess UMat Canny function uses OCL_RUN version of function