get BufferedImage Average Point - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Effect

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Description

get BufferedImage Average Point

Demo Code

/*/*from  w  ww. ja v a  2 s . c  o m*/
 * (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 Point getAvgPoint(BufferedImage srcImg) {
        return getAvgPoint(srcImg, 0);
    }
    public static Point getAvgPoint(BufferedImage srcImg, int threshhold) {

        int h = srcImg.getHeight();
        int w = srcImg.getWidth();
        // difference image

        double meanX = 0.0;
        double meanY = 0.0;
        int meanThresh = 10;
        int count = 0;

        for (int y = 0; y < h; ++y) {
            int rowY = 0;
            for (int x = 0; x < w; ++x) {
                int srcPixel = getGrey(srcImg.getRGB(x, y));
                if (srcPixel > meanThresh) {
                    rowY = rowY + srcPixel;
                    meanY = meanY + y;
                    count++;
                }
            }
        }
        if (count > 0) {
            meanY = meanY / count;
        }
        count = 0;
        for (int x = 0; x < w; ++x) {
            int rowX = 0;
            for (int y = 0; y < h; ++y) {
                int srcPixel = getGrey(srcImg.getRGB(x, y));
                if (srcPixel > meanThresh) {
                    rowX = rowX + srcPixel;
                    meanX = meanX + x;
                    count++;
                }
            }
        }

        if (count > 0) {
            meanX = meanX / count;
        }
        // Utils.log("x=" + meanX + ",y=" + meanY + ",count=" + count);
        // adding threshhold
        Utils.log("count=" + count);
        Point pt = null;
        if (threshhold > 0) {
            if (count > threshhold) {
                pt = new Point(new Double(meanX).intValue(), new Double(
                        meanY).intValue());
            } else {
                pt = new Point(w / 2, h / 2);
            }
        } else {
            pt = new Point(new Double(meanX).intValue(),
                    new Double(meanY).intValue());
        }
        return pt;
    }
    public static Color getGrey(Color color) {
        int r = color.getRed();
        int g = color.getGreen();
        int b = color.getBlue();
        int gray = (int) ((r + g + b) / 3.0);
        return new Color(gray, gray, gray);
    }
    /**
     * @deprecated
     **/

    public static int getGrey(int colorInt) {
        return getGrey255(colorInt);
    }
    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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