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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.feature.local.engine;

import org.openimaj.feature.local.list.LocalFeatureList;
import org.openimaj.image.FImage;
import org.openimaj.image.analysis.pyramid.gaussian.GaussianOctave;
import org.openimaj.image.analysis.pyramid.gaussian.GaussianPyramid;
import org.openimaj.image.feature.local.descriptor.gradient.IrregularBinningSIFTFeatureProvider;
import org.openimaj.image.feature.local.detector.dog.collector.Collector;
import org.openimaj.image.feature.local.detector.dog.collector.OctaveKeypointCollector;
import org.openimaj.image.feature.local.detector.dog.extractor.GradientFeatureExtractor;
import org.openimaj.image.feature.local.detector.dog.extractor.NullOrientationExtractor;
import org.openimaj.image.feature.local.detector.dog.pyramid.DoGOctaveExtremaFinder;
import org.openimaj.image.feature.local.detector.pyramid.BasicOctaveExtremaFinder;
import org.openimaj.image.feature.local.detector.pyramid.OctaveInterestPointFinder;
import org.openimaj.image.feature.local.keypoints.Keypoint;

/**
 * SIFT engine that isn't rotation invariant (using 
 * {@link NullOrientationExtractor}) and uses the 
 * {@link IrregularBinningSIFTFeatureProvider}.
 * 
 * @author Sina Samangooei ([email protected])
 * @author Jonathon Hare ([email protected])
 */
public class ALTDoGSIFTEngine extends DoGSIFTEngine {
	@Override
	public LocalFeatureList findFeatures(FImage image) {
		OctaveInterestPointFinder, FImage> finder = 
			new DoGOctaveExtremaFinder(new BasicOctaveExtremaFinder(options.magnitudeThreshold, options.eigenvalueRatio));
		
		Collector, Keypoint, FImage> collector = new OctaveKeypointCollector(
				new GradientFeatureExtractor(
						new NullOrientationExtractor(),
						new IrregularBinningSIFTFeatureProvider(options.numOriBins, options.valueThreshold), 
						options.magnificationFactor * options.numSpatialBins
				));
		
		finder.setOctaveInterestPointListener(collector);
		
		options.setOctaveProcessor(finder);
		
		GaussianPyramid pyr = new GaussianPyramid(options);
		pyr.process(image);
		
		return collector.getFeatures();
	}
}