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/**
* Copyright (c) 2011, The University of Southampton and the individual contributors.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the University of Southampton nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.openimaj.image.processing.algorithm;
import org.openimaj.image.FImage;
import org.openimaj.image.processor.ImageProcessor;
/**
* An {@link ImageProcessor} that computes the mean of the image's pixels
* and subtracts the mean from all pixels.
*
* @author Jonathon Hare ([email protected])
*/
public class MeanCenter implements ImageProcessor {
@Override
public void processImage(FImage image) {
final int width = image.width;
final int height = image.height;
final float[][] data = image.pixels;
image.subtractInplace(patchMean(data, 0, 0, width, height));
}
/**
* same as {@link #patchMean(float[][], int, int, int, int)} but the width and height are taken from data[0].length and data.length
* @param data
* @return the patch mean
*/
public static final float patchMean(final float[][] data){
return patchMean(data, 0, 0, data.length > 0 && data[0]!=null ? data[0].length : 0, data.length);
}
/**
* Finds the mean value of a sub-patch of a 2D float array.
* @param data the array
* @param x the location of the sub-patch
* @param y the location of the sub-patch
* @param width sub-patch width
* @param height sub-patch height
* @return the mean value
*/
public static final float patchMean(final float[][] data, final int x, final int y, final int width, final int height) {
float accum = 0;
final int endX = width + x;
final int endY = height + y;
for (int yy=y; yy
