org.openimaj.image.processing.threshold.AdaptiveLocalThresholdContrast Maven / Gradle / Ivy
/**
* Copyright (c) 2011, The University of Southampton and the individual contributors.
* All rights reserved.
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* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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package org.openimaj.image.processing.threshold;
import org.openimaj.image.FImage;
import org.openimaj.image.processing.algorithm.FilterSupport;
import org.openimaj.image.processing.algorithm.MinMaxAnalyser;
/**
* Adaptive local thresholding using the local contrast. Pixels are set to 1 if
* they are closer to the local maximum rather than the local minimum.
*
* @see http://fiji.sc/wiki/index.php/Auto_Local_Threshold
*
* @author Jonathon Hare ([email protected])
*
*/
public class AdaptiveLocalThresholdContrast extends AbstractLocalThreshold {
/**
* Construct the thresholding operator with the given patch size (assumed
* square)
*
* @param size
* size of the local image patch
*/
public AdaptiveLocalThresholdContrast(int size) {
super(size);
}
/**
* Construct the thresholding operator with the given patch size
*
* @param size_x
* width of patch
* @param size_y
* height of patch
*/
public AdaptiveLocalThresholdContrast(int size_x, int size_y) {
super(size_x, size_y);
}
@Override
public void processImage(FImage image) {
final MinMaxAnalyser minimax = new MinMaxAnalyser(FilterSupport.createBlockSupport(sizeX, sizeY));
minimax.analyseImage(image);
final float[][] minpix = minimax.min.pixels;
final float[][] maxpix = minimax.max.pixels;
final float[][] ipix = image.pixels;
for (int y = 0; y < image.height; y++)
for (int x = 0; x < image.width; x++)
ipix[y][x] = (ipix[y][x] - minpix[y][x]) > (maxpix[y][x] - ipix[y][x]) ? 1 : 0;
}
}