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Implementation of a flexible face-recognition pipeline, including pluggable detectors, aligners, feature extractors and recognisers.
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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.face.recognition;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import org.openimaj.image.processing.face.detection.DetectedFace;
import org.openimaj.io.ReadWriteableBinary;
import org.openimaj.ml.annotation.IncrementalAnnotator;
import org.openimaj.ml.annotation.RestrictedAnnotator;
import org.openimaj.ml.annotation.ScoredAnnotation;

/**
 * Base class for all Face Recognisers.
 * 
 * @author Jonathon Hare ([email protected])
 * 
 * @param 
 *            Type of {@link DetectedFace}
 * @param 
 *            Type of object representing a person
 */
public abstract class FaceRecogniser
		extends
		IncrementalAnnotator
		implements
		RestrictedAnnotator,
		ReadWriteableBinary
{
	protected FaceRecogniser() {
	}

	/**
	 * Attempt to recognize the given face, restricting the potential people to
	 * coming from the given set.
	 * 
	 * @param object
	 *            the detected face
	 * @param restrict
	 *            the set of allowed people
	 * @return potential people
	 */
	@Override
	public abstract List> annotate(FACE object, Collection restrict);

	/**
	 * Attempt to recognize the given face, restricting the potential people to
	 * coming from the given set.
	 * 
	 * @param object
	 *            the detected face
	 * @param restrict
	 *            the set of allowed people
	 * @return potential people
	 */
	public ScoredAnnotation annotateBest(FACE object, Collection restrict) {
		final List> pot = annotate(object, restrict);

		if (pot == null || pot.size() == 0)
			return null;

		Collections.sort(pot);

		return pot.get(0);
	}

	/**
	 * Attempt to recognize the given face.
	 * 
	 * @param object
	 *            the detected face
	 * @return potential people
	 */
	@Override
	public abstract List> annotate(FACE object);

	/**
	 * Attempt to recognize the given face.
	 * 
	 * @param object
	 *            the detected face
	 * @return potential people
	 */
	public ScoredAnnotation annotateBest(FACE object) {
		final List> pot = annotate(object);

		if (pot == null || pot.size() == 0)
			return null;

		return pot.get(0);
	}

	/**
	 * Convenience method for {@link #getAnnotations()}
	 * 
	 * @see #getAnnotations()
	 * @return the people that can be recognised
	 */
	public Set listPeople() {
		return this.getAnnotations();
	}
}