Utils.bitmapToMat(myBitmap32, matImage);

            Mat hsv = new Mat();
            Imgproc.cvtColor(matImage, hsv, Imgproc.COLOR_RGB2HSV);

            Scalar lowerThreshold = new Scalar(0, 0.23 * 255, 50); // brown/skin color sana – lower hsv values
            Scalar upperThreshold = new Scalar(50, 0.68 * 255, 255); // brown/skin color sana  – higher hsv values
            Mat segmentedImage = new Mat();

            Core.inRange(hsv, lowerThreshold, upperThreshold, segmentedImage);

            Mat dilatedMat = new Mat();

            Imgproc.dilate(segmentedImage, dilatedMat, new Mat());


            List<MatOfPoint> contours = new ArrayList<MatOfPoint>();
            Mat hierarchy = new Mat();
            Imgproc.findContours(dilatedMat, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);

            double maxVal = 0;
            int maxValIdx = 0;
            for (int contourIdx = 0; contourIdx < contours.size(); contourIdx++)
            {
                double contourArea = Imgproc.contourArea(contours.get(contourIdx));
                if (maxVal < contourArea)
                {
                    maxVal = contourArea;
                    maxValIdx = contourIdx;
                }
            }

            Imgproc.drawContours(matImage, contours, maxValIdx, new Scalar(0,255,0), -1);


                final Bitmap resultBitmap = Bitmap.createBitmap(matImage.cols(), matImage.rows(), Bitmap.Config.ARGB_8888);
            Utils.matToBitmap(matImage, resultBitmap);`