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Java example source code file (ImageComparator.java)

This example Java source code file (ImageComparator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

accuracy, awt, bufferedimage, color, errors, illegalargumentexception, image, imagecomparator, images, max, string

The ImageComparator.java Java example source code

/*
 * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

import java.awt.Color;
import java.awt.image.BufferedImage;

public class ImageComparator {
    double accuracy;
    int errorCounter = 0;
    double maxError = 0f;

    int rMask = 0x00FF0000;
    int gMask = 0x0000FF00;
    int bMask = 0x000000FF;

    int rShift = 16;
    int gShift = 8;
    int bShift = 0;

    public ImageComparator() {
        accuracy = 0;
    }

    public ImageComparator(double accuracy) {
        this.accuracy = accuracy;
    }

    public ImageComparator(double accuracy, int rBits, int gBits, int bBits) {
        this.accuracy = accuracy;
        rShift += (8 - rBits);
        gShift += (8 - gBits);
        bShift += (8 - bBits);
    }

    public boolean compare(int c1, int c2) {
        int d1 = Math.abs(((c1&bMask)>>bShift) - ((c2&bMask)>>bShift));
        int d2 = Math.abs(((c1&gMask)>>gShift) - ((c2&gMask)>>gShift));
        int d3 = Math.abs(((c1&rMask)>>rShift) - ((c2&rMask)>>rShift));
        if (d1 < d2) d1 = d2;
        if (d1 < d3) d1 = d3;
        if (d1 >= accuracy) {
            errorCounter++;
            if (d1 > maxError) maxError = d1;
            return false;
        }
        return true;
    }

    public boolean compare(double r1, double g1, double b1,
                           double r2, double g2, double b2)
    {
        double d1 = Math.abs(r1 - r2);
        double d2 = Math.abs(g1 - g2);
        double d3 = Math.abs(b1 - b2);
        if (d1 < d2) d1 = d2;
        if (d1 < d3) d1 = d3;
        if (d1 >= accuracy) {
            errorCounter++;
            if (d1 > maxError) maxError = d1;
            return false;
        }
        return true;
    }

    public boolean compare(Color c1, Color c2) {
        return compare(c1.getRed(), c1.getGreen(), c1.getBlue(),
                       c2.getRed(), c2.getGreen(), c2.getBlue());
    }

    public boolean compare(BufferedImage img1, BufferedImage img2) {
        boolean result = true;
        if (img1.getWidth() != img2.getWidth() ||
            img1.getHeight() != img2.getHeight()) {
            throw new IllegalArgumentException(
                "Images have different width or height");
        }
        for (int i = 0; i < img1.getWidth(); i++) {
            for (int j = 0; j < img1.getHeight(); j++) {
                boolean cmp = compare(img1.getRGB(i,j), img2.getRGB(i,j));
                result = cmp && result;
            }
        }
        return result;
    }

    public void resetStat() {
        errorCounter = 0;
        maxError = 0;
    }

    public String getStat() {
        return "Accuracy " + accuracy + ". Errors " + errorCounter +
               ". Max error " + maxError;
    }

    boolean compare(BufferedImage dst, BufferedImage gldImage, int x0, int y0,
                    int dx, int dy)
    {
        int width = gldImage.getWidth();
        int height = gldImage.getHeight();

        if (x0 < 0) x0 = 0;
        if (x0 > width - dx) x0 = width - dx;
        if (y0 < 0) y0 = 0;
        if (y0 > height - dy) y0 = height - dy;

        int c = 0;

        boolean result = true;
        for (int i = x0; i < x0 + dx; i++) {
            for (int j = y0; j < y0 + dy; j++) {
                boolean cmp = compare(dst.getRGB(i-x0,j-y0),
                                      gldImage.getRGB(i,j));
                result = cmp && result;
            }
        }
        return result;
    }
}

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