Desktop : OpenCV Watershed

Goal

Test OpenCV Watershed.

OpenCV_Watershed.java

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class OpenCV_Watershed {
    public static void main( String[] args )
    {
        try{
            System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
            Mat source = Imgcodecs.imread(
                    "D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena.jpg",
                    Imgcodecs.CV_LOAD_IMAGE_COLOR);
            Mat gray=new Mat(source.rows(),source.cols(),CvType.CV_8UC1);
            Imgproc.cvtColor(source, gray, Imgproc.COLOR_BGR2GRAY);
            Mat binary=Mat.zeros(gray.rows(),gray.cols(),CvType.CV_8UC1);
            Imgproc.threshold(gray, binary, 100, 255, Imgproc.THRESH_BINARY);


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

            Mat bg=new Mat(source.size(),CvType.CV_8U);
            Imgproc.dilate(binary, bg, new Mat(),new Point(-1,-1),3);
            Imgproc.threshold(bg,bg, 1, 128, Imgproc.THRESH_BINARY_INV);

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


            Mat tmp=new Mat(binary.size(),CvType.CV_8U,new Scalar(0));
            Mat tmper=new Mat(binary.size(),CvType.CV_8U,new Scalar(0));
            Mat tmper1=new Mat(binary.size(),CvType.CV_8U,new Scalar(0));


            //Watershed
            markers.convertTo(tmper, CvType.CV_32S);
            Imgproc.watershed(source, tmper);
            tmper.convertTo(tmp, CvType.CV_8U);
            //markers.convertTo(tmp, CvType.CV_8U);
            tmper.convertTo(tmper1, CvType.CV_8U,255,255);
            Imgcodecs.imwrite("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena_watered.jpg", markers);
            Imgcodecs.imwrite("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena_watered1.jpg",tmp);
            Imgcodecs.imwrite("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena_watered2.jpg",tmper);
            Imgcodecs.imwrite("D:\\projects\\Java\\OpenCV_Samples\\resource\\imgs\\lena_watered3.jpg",tmper1);

        }catch (Exception e) {
            System.out.println("error: " + e.getMessage());
        }
    }
}

Result