Java – the watershed in opencv Android

I try to implement the watershed function of OpenCV on Android But my program always crashes where the watershed function is called I can output the marked results perfectly But the watershed function always crashes This is my code:

Mat threeChannel = new Mat();
         Imgproc.cvtColor(mRgba,threeChannel,Imgproc.COLOR_BGR2GRAY);
         Imgproc.threshold(threeChannel,100,255,Imgproc.THRESH_BINARY);

         Mat fg = new Mat(mRgba.size(),CvType.CV_8U);
         Imgproc.erode(threeChannel,fg,new Mat(),new Point(-1,-1),2);

         Mat bg = new Mat(mRgba.size(),CvType.CV_8U);
         Imgproc.dilate(threeChannel,bg,3);
         Imgproc.threshold(bg,1,128,Imgproc.THRESH_BINARY_INV);

         Mat markers = new Mat(mRgba.size(),CvType.CV_8U,new Scalar(0));
         Core.add(fg,markers);

         WatershedSegmenter segmenter = new WatershedSegmenter();
         segmenter.setMarkers(markers);
         Mat result = segmenter.process(mRgba);

         return result;

The watershedsegment calss is as follows:

public class WatershedSegmenter{
    public Mat markers;

    public void setMarkers(Mat markerImage)
    {
        markerImage.convertTo(markers,CvType.CV_32S);
    }

    public Mat process(Mat image)
    {
        Imgproc.watershed(image,markers);
        markers.convertTo(markers,CvType.CV_8U);
        return markers;
    }
}

Has anyone managed to make it run on Android? Before using this tutorial, I try to make it use QT: link. In Q But I have no luck on Android at present

Solution

I have now discovered the cause of the crash The watershed adopts 8-bit 3-channel data format, and RGBA adopts 4-channel data format I just convert it from RGBA to RGB. It solves all the problems