get Image Difference - Java 2D Graphics

Java examples for 2D Graphics:Image

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Description

get Image Difference

Demo Code

/*//from   ww w  .ja v a2s  .  com
 * (C) Copyright 2000-2011, by Scott Preston and Preston Research LLC
 *
 *  Project Info:  http://www.scottsbots.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
import java.awt.Color;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.renderable.ParameterBlock;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import javax.imageio.ImageIO;
import javax.media.jai.Histogram;
import javax.media.jai.JAI;
import javax.media.jai.PlanarImage;
import com.scottsbots.core.utils.Utils;

public class Main{
    public static double getImageDifference(BufferedImage img1,
            BufferedImage img2) {

        int h = img1.getHeight();
        int w = img1.getWidth();

        int total = h * w;
        int sum = 0;

        for (int y = 0; y < h; ++y) {
            for (int x = 0; x < w; ++x) {
                // get grey of image
                int srcPixel = getGrey255(img1.getRGB(x, y));
                // get color of last image
                int diffPixel = getGrey255(img2.getRGB(x, y));
                // calculate differnece
                int diff = Math.abs(srcPixel - diffPixel);
                // make difference color
                if (diff > 50) {// some %20 of total color range of 255
                    sum++;
                }
            }
        }
        return (double) sum / (double) total;

    }
    public static int getGrey255(int c) {
        Color color = new Color(c);
        int r = color.getRed();
        int g = color.getGreen();
        int b = color.getBlue();
        int gray = (int) ((r + g + b) / 3.0);
        return gray;
    }
}

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