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How to detect arc of a given image using opencv and java. It will be very useful if some one show me link for documentation and general guide.

How to detect System.loadLibrary(Core.NATIVE_LIBRARY_NAME); FileChooser fileChooser = new FileChooser(); configureFileChooser(fileChooser); file = fileChooser.showOpenDialog(find_arc.getScene().getWindow()); uploadInitialProcessing();

    Mat src = resultMat;
    // Check if image is loaded fine
    if (src.empty()) {
        System.out.println("Error opening image!");
        System.exit(-1);
    }
    Mat gray = new Mat();
    Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);
    Imgproc.medianBlur(gray, gray, 5);
    double perimeter = Imgproc.arcLength((MatOfPoint2f) gray, true);
    System.out.println(String.valueOf(perimeter));

I want to find the arc length. At the arcLength function , the first parameter must be a MatOfPoint2f one. So here i am going to convert a Mat into MatOfPoint2f. I know it is wrong(in this code.cannot cast like that) and it cant be possible. I want to find MatOfPoint2f points of a given image using opencv and java. It will be very useful if some one show me link for documentation and general guide. Mat gray.How can i achieve that.

System.loadLibrary(Core.NATIVE_LIBRARY_NAME); FileChooser fileChooser = new FileChooser(); configureFileChooser(fileChooser); file = fileChooser.showOpenDialog(find_arc.getScene().getWindow()); uploadInitialProcessing();

  Mat src = resultMat;
     // Check if image is loaded fine
     if (src.empty()) {
         System.out.println("Error opening image!");
         System.exit(-1);
     }
     Mat gray = new Mat();
     Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);
     Imgproc.medianBlur(gray, gray, 5);
     double perimeter = Imgproc.arcLength((MatOfPoint2f) gray, true);
     System.out.println(String.valueOf(perimeter));

I want to find the arc length. At the arcLength function , the first parameter must be a MatOfPoint2f one. So here i am going to convert a Mat into MatOfPoint2f. I know it is wrong(in this code.cannot cast like that) and it cant be possible. I want to find MatOfPoint2f points of Mat gray.How can i achieve that.