Morphological closing using java

Question

I am trying to use this source code to do a morphologial closing on an image (with canny edge detected) https://code.google.com/p/doccrop/source/browse/DocCrop/src/imageanalysis/morphology/Closing.java?r=3

I've created an instance of Closing and I've applied it on a BufferedImage and then draw it but I get a black image as a result!! At first I had an error saying that the image must be type_byte_gray so I used this to change type but I guess it doesn't work

      BufferedImage img1= ImageIO.read(new File(path));
  BufferedImage imge = new BufferedImage(img1.getHeight(),img1.getWidth(),BufferedImage.TYPE_BYTE_GRAY); 

Answer 1

You might use an image processing framework, like Marvin or ImageJ, for such purpose, as shown below.

input:

output:

source code:

import marvin.image.MarvinColorModelConverter;
import marvin.image.MarvinImage;
import marvin.io.MarvinImageIO;
import marvin.math.MarvinMath;
import static marvin.MarvinPluginCollection.*;

public class ClosingDemo {

    public ClosingDemo(){
        MarvinImage image = MarvinImageIO.loadImage("./res/closingIn.png");
        image = MarvinColorModelConverter.rgbToBinary(image, 127);
        morphologicalClosing(image.clone(), image, MarvinMath.getTrueMatrix(60, 60));
        MarvinImageIO.saveImage(image, "./res/closingOut.png");
    }

    public static void main(String[] args) {
        new ClosingDemo();
        System.exit(0);
    }
}