org.openimaj.workinprogress.BrightnessClusteringTransform Maven / Gradle / Ivy

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A project for various tests that don't quite constitute demos but might be useful to look at.
There is a newer version: 1.3.8
/**
 * 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.workinprogress;

import org.openimaj.image.FImage;
import org.openimaj.image.analysis.algorithm.SummedAreaTable;
import org.openimaj.image.processing.convolution.FGaussianConvolve;
import org.openimaj.image.processor.ImageProcessor;
import org.openimaj.util.array.ArrayUtils;

import cern.jet.random.Uniform;
import cern.jet.random.engine.MersenneTwister;

/**
 * Implementation of the Brightness Clustering Transform.
 * 
 * FIXME: add references when available and move.
 *
 * @author Jonathon Hare ([email protected])
 *
 */
public class BrightnessClusteringTransform implements ImageProcessor {
	float sigma = 2;
	int maxVotes = 100000;
	int rangeMin = 3;
	int rangeMax = 7;
	Uniform rng = new Uniform(new MersenneTwister());

	@Override
	public void processImage(FImage image) {
		final SummedAreaTable sat = new SummedAreaTable(image);
		final FImage output = new FImage(image.width, image.height);

		for (int vote = 0; vote < maxVotes; vote++) {
			// First step
			int widthR = (int) Math.pow(2, rng.nextIntFromTo(rangeMin, rangeMax));
			int heightR = (int) Math.pow(2, rng.nextIntFromTo(rangeMin, rangeMax));
			int xR = rng.nextIntFromTo(0, image.width - widthR);
			int yR = rng.nextIntFromTo(0, image.height - heightR);

			// Second step
			while (widthR > 2 && heightR > 2) {
				final int hw = widthR / 2;
				final int hh = heightR / 2;

				final float[] r = {
						sat.calculateArea(xR, yR, xR + hw, yR + hh),
						sat.calculateArea(xR + hw, yR, xR + widthR, yR + hh),
						sat.calculateArea(xR, yR + hh, xR + hw, yR + heightR),
						sat.calculateArea(xR + hw, yR + hh, xR + widthR, yR + heightR),
				};

				final int[] f = ArrayUtils.indexSort(r);
				if (r[f[3]] == r[f[2]])
					break;

				final int maxIdx = ArrayUtils.maxIndex(r);

				widthR = hw;
				heightR = hh;
				if (maxIdx == 1) {
					xR = xR + hw;
				} else if (maxIdx == 2) {
					yR = yR + hh;
				} else if (maxIdx == 3) {
					xR = xR + hw;
					yR = yR + hh;
				}
			}

			// Third step
			final int xLoc = Math.round(xR + widthR / 2);
			final int yLoc = Math.round(yR + heightR / 2);
			output.pixels[yLoc][xLoc]++;
		}

		output.processInplace(new FGaussianConvolve(sigma));
		image.internalAssign(output.normalise());
	}

	// public static void main(String[] args) throws IOException {
	// // FImage image = ImageUtilities.readF(new
	// // File("/Users/jon/Pictures/Pictures/2007/02/17/IMG_1165.JPG"));
	// // image = ResizeProcessor.halfSize(image);
	// final FImage image = new FImage(400, 400);
	// image.drawShapeFilled(new Ellipse(200, 200, 20, 20, 0), 1f);
	//
	// DisplayUtilities.display(image);
	//
	// final FImage result = image.process(new BrightnessClusteringTransform());
	// DisplayUtilities.display(result);
	// }
}