public static void zad6() {
        Mat image = Imgcodecs.imread("img.jpg", IMREAD_GRAYSCALE);
        Mat src = new Mat();
        Mat dst = new Mat();
        Mat dst1 = new Mat();
        Mat dst3 = new Mat();
        Mat kontury = new Mat();
        Mat kontury1 = new Mat();
        Mat kontury2 = new Mat();
        final Size kernelSize = new Size(11, 11);
        Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, kernelSize);
        final Point anchor = new Point(-1, -1);
        final int iterations = 2;

        namedWindow("Ukasz", WINDOW_AUTOSIZE);
        imshow("Ukasz", image);
        waitKey(0);

        int x = 25;
        int y = 5;
        System.out.println("x: " + x);
        System.out.println("y: " + y);
        adaptiveThreshold(image, src, 255, ADAPTIVE_THRESH_MEAN_C, THRESH_BINARY, x, y);
        imshow("Output", src);
        waitKey(0);

        //pierwszy wzór
        Imgproc.dilate(src, dst, kernel, anchor);
        Core.subtract(dst, src, kontury);

        //drugi wzór
        Imgproc.erode(src, dst1, kernel, anchor);
        Core.subtract(src, dst1, kontury1);

        Core.subtract(dst, dst1, kontury2);

        namedWindow("kontury1", WINDOW_AUTOSIZE);
        imshow("kontury1", kontury);
        waitKey(0);

        namedWindow("kontury2", WINDOW_AUTOSIZE);
        imshow("kontury2", kontury1);
        waitKey(0);

        namedWindow("kontury3", WINDOW_AUTOSIZE);
        imshow("kontury3", kontury2);
        waitKey(0);
        System.exit(0);
    }