Java BufferedImage Operation determineBackgroundColor(BufferedImage bim)

Description

determine Background Color

License

EUPL

Declaration

public static Color determineBackgroundColor(BufferedImage bim) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * <copyright> Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria </copyright>
 * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
 * joint initiative of the Federal Chancellery Austria and Graz University of
 * Technology.//from   ww w. j a  v  a 2s  .c  o m
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/

import java.awt.Color;

import java.awt.image.BufferedImage;

import java.util.HashMap;

public class Main {
    public static Color determineBackgroundColor(BufferedImage bim) {

        int inset = 5;//px

        int pixelUpLeft = bim.getRGB(inset, inset);
        int pixelUpRight = bim.getRGB(bim.getWidth() - inset, inset);
        int pixelDownLeft = bim.getRGB(inset, bim.getHeight() - inset);
        int pixelDownRight = bim.getRGB(bim.getWidth() - inset, bim.getHeight() - inset);

        HashMap<Integer, Integer> stats = new HashMap<Integer, Integer>();
        stats.put(pixelUpLeft, 0);
        stats.put(pixelUpRight, 0);
        stats.put(pixelDownLeft, 0);
        stats.put(pixelDownRight, 0);

        stats.put(pixelUpLeft, stats.get(pixelUpLeft) + 1);
        stats.put(pixelUpRight, stats.get(pixelUpRight) + 1);
        stats.put(pixelDownLeft, stats.get(pixelDownLeft) + 1);
        stats.put(pixelDownRight, stats.get(pixelDownRight) + 1);

        int bgValue = -1;
        int cnt = 0;
        for (int key : stats.keySet()) {
            if (stats.get(key) > cnt) {
                cnt = stats.get(key);
                bgValue = key;
            }
        }

        return new Color(bgValue);
    }
}

Related

1. cylindricalMapping(BufferedImage img, double f)
2. darkenImage(final BufferedImage image, final float darken)
3. declareNewBufferedImage(int x, int y)
4. declareNewBufferedImageAndCopy(BufferedImage img)
5. depalettize(BufferedImage img, int maxBytes)
6. doInGraphics(final BufferedImage image, final Consumer consumer)
7. duplicate(BufferedImage image)
8. DuplicateBufferedImage(BufferedImage bi)
9. duplicateImage(BufferedImage image)