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Erosion.java

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/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package image2d;

import java.awt.image.BufferedImage;

/**

*

* @author pratchaya

*/

public class Erosion {

private static int minPixel(BufferedImage _image, int _w, int _h, int r) {

int minR = 255;

int minG = 255;

int minB = 255;

int radiusPow = r * r;

int _r = r/2;

for (int i = -_r; i < _r; i++) {

for (int j = -_r; j < _r; j++) {

if (i * i + j * j < radiusPow) {

int c = RGB.getRGBW(_image, _w + i, _h + j);

minR = Math.min(minR, (c >> 16) & 0xFF);

minG = Math.min(minG, (c >> 8) & 0xFF);

minB = Math.min(minB, c & 0xFF);

} // end if

} // end j

} // end i

return (minR << 16) | (minG << 8) | minB;

}

public static BufferedImage apply(BufferedImage _image, int _radius) {

int width = _image.getWidth();

int height = _image.getHeight();

int radius = _radius;

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);

for (int i = 0; i < width; i++) {

for (int j = 0; j < height; j++) {

image.setRGB(i, j, minPixel(_image, i, j, radius));

}

}

return image;

}

}