How To use OpenCv(2.4.5) GrabCut

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Hello Everyone,

Here is my code using the OpenCv method GrabCut, but there is a problem. The input image is a color image, but through Grabcut, the result image is a grey level image.

The code as follows:

    Long startTime = System.currentTimeMillis();

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.p4);
    Log.d(TAG, "bitmap: " + bitmap.getWidth() + "x" + bitmap.getHeight());


    bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
    Log.d(TAG, "bitmap 8888: " + bitmap.getWidth() + "x" + bitmap.getHeight());


    //GrabCut part
    Mat img = new Mat();
    Utils.bitmapToMat(bitmap, img);
    Log.d(TAG, "img: " + img);

    int r = img.rows();
    int c = img.cols();

    Point p1 = new Point(c/10, r/10);
    Point p2 = new Point(c-c/10, r-r/10);
    Rect rect = new Rect(p1,p2);
    //Rect rect = new Rect(50,30, 100,200);
    Log.d(TAG, "rect: " + rect);

    Mat mask = new Mat();
    Mat fgdModel = new Mat();
    Mat bgdModel = new Mat();


    Mat imgC3 = new Mat();  
    Imgproc.cvtColor(img, imgC3, Imgproc.COLOR_RGBA2RGB);
    Log.d(TAG, "imgC3: " + imgC3);

    Log.d(TAG, "Grabcut begins");
    Imgproc.grabCut(imgC3, mask, rect, bgdModel, fgdModel, 2, Imgproc.GC_INIT_WITH_RECT);

    Core.convertScaleAbs(mask, mask, 100, 0);
    Imgproc.cvtColor(mask, mask, Imgproc.COLOR_GRAY2RGBA,4);
    Log.d(TAG, "maskC4: " + mask);

    //convert to Bitmap
    Log.d(TAG, "Convert to Bitmap");

    Utils.matToBitmap(mask, bitmap);


    iv.setImageBitmap(bitmap);
    Long endTime = System.currentTimeMillis();
    Long time=endTime-startTime;
    System.out.println("Time Is:"+time);
    //release MAT part
    img.release();
    imgC3.release();
    mask.release();
    fgdModel.release();
    bgdModel.release();