Java BufferedImage Operation floatBufferToGrayBufferedImage(FloatBuffer floatBuffer, BufferedImage bi)

Description

Converts float values to an unsigned short BufferedImage.

License

Open Source License

Parameter

Parameter	Description
floatBuffer	contains float values. The size of the buffer must be at least as big as the size of the image.
bi	<code>BufferedImage</code> with type TYPE_USHORT_GRAY.
widthStep	number of float values per row in <code>floatBuffer</code>.

Declaration

public static BufferedImage floatBufferToGrayBufferedImage(FloatBuffer floatBuffer, BufferedImage bi) 

Method Source Code

//package com.java2s;
/*//  www  .  j  a  v a2 s. c o  m
 * Image conversion utilities.
 * 
 * Copyright (c) 2006 Jean-Sebastien Senecal (js@drone.ws)
 * 
 * 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 2 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, write to the Free Software Foundation, Inc., 675 Mass
 * Ave, Cambridge, MA 02139, USA.
 */

import java.awt.image.BufferedImage;

import java.awt.image.DataBufferUShort;

import java.nio.FloatBuffer;

public class Main {
    /**
     * Converts float values to an unsigned short <code>BufferedImage</code>.
     * 
     * @param floatBuffer contains float values. The size of the buffer must be at
     *    least as big as the size of the image.
     * @param bi <code>BufferedImage</code> with type TYPE_USHORT_GRAY. 
     * @param widthStep number of float values per row in 
     *    <code>floatBuffer</code>.
     * @return
     */
    public static BufferedImage floatBufferToGrayBufferedImage(FloatBuffer floatBuffer, BufferedImage bi) {
        if (bi.getType() != BufferedImage.TYPE_USHORT_GRAY)
            throw new IllegalArgumentException(
                    "Invalid image type. Expect image " + "type BufferedImage.TYPE_USHORT_GRAY.");
        int maxDepth = 1 << 16 - 1;

        float min = Float.MAX_VALUE;
        float max = Float.MIN_VALUE;
        floatBuffer.rewind();
        while (floatBuffer.remaining() > 0) {
            float value = floatBuffer.get();
            min = Math.min(min, value);
            max = Math.max(max, value);
        }
        short[] array = ((DataBufferUShort) bi.getRaster().getDataBuffer()).getData();

        float range = max - min;
        if (range == 0)
            range = 1;
        floatBuffer.rewind();
        while (floatBuffer.remaining() > 0) {
            int pos = floatBuffer.position();
            float value = floatBuffer.get();
            int converted = Math.round(((value - min) * maxDepth / range));
            array[pos] = (short) converted;
        }
        return bi;
    }
}

Related

1. findDominantColor(BufferedImage paramBufferedImage)
2. findLegacyColorModel(BufferedImage image)
3. findLegendLH(BufferedImage bufferedImage)
4. findTranslation(AffineTransform at, BufferedImage bi)
5. fixImage(BufferedImage img, String ext)
6. floodFill(BufferedImage img, int startX, int startY, Color targetColor, Color replacementColor)
7. fuzzyCompare(final BufferedImage img1, final BufferedImage img2, final double colorTolerance, final double pixelTolerance, final int fuzzyBlockDimension)
8. fuzzyEquals(BufferedImage a, BufferedImage b, int threshold)
9. genBlackAndWhiteImage(BufferedImage image)