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Implementations of various image, pixel and connected component processors (resizing, convolution, edge detection, ...).

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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.processing.convolution.FGaussianConvolve;
import org.openimaj.image.processor.ImageProcessor;

/**
 * Implementation of a difference of Gaussian filter.
 * 
 * @author Jonathon Hare ([email protected])
 *
 */
public class DifferenceOfGaussian implements ImageProcessor {
	FGaussianConvolve filter1;
	FGaussianConvolve filter2;
	
	/**
	 * Construct a difference of Gaussian with the default sigmas
	 * of 1 and 2.
	 */
	public DifferenceOfGaussian() {
		this(1, 2);
	}
	
	/**
	 * Construct a difference of Gaussian with the specified 
	 * sigmas.
	 * @param sigma1 first (smaller sigma)
	 * @param sigma2 second sigma
	 */
	public DifferenceOfGaussian(float sigma1, float sigma2) {
		filter1 = new FGaussianConvolve(sigma1);
		filter2 = new FGaussianConvolve(sigma2);
	}
	
	/* (non-Javadoc)
	 * @see org.openimaj.image.processor.ImageProcessor#processImage(org.openimaj.image.Image)
	 */
	@Override
	public void processImage(FImage image) {
		FImage blur1 = image.process(filter1);
		FImage blur2 = image.process(filter2);
		
		image.internalAssign(blur1.subtractInplace(blur2));
	}
}