001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.image.processing.face.detection;
031
032import org.openimaj.image.FImage;
033import org.openimaj.image.processing.transform.FProjectionProcessor;
034import org.openimaj.math.geometry.shape.Ellipse;
035import org.openimaj.math.geometry.shape.Shape;
036import org.openimaj.math.geometry.transforms.TransformUtilities;
037
038import Jama.Matrix;
039
040/**
041 * An extension of a {@link DetectedFace} that represents the detection by an
042 * ellipse. The patch is extracted from the oriented bounding box surrounding
043 * the detection ellipse. The {@link Ellipse#getRotation()} is assumed to point
044 * towards the bottom of the face; this means a rotation of +pi/2 equates to an
045 * upright detection.
046 * 
047 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
048 * 
049 */
050public class EllipticalDetectedFace extends DetectedFace {
051        Ellipse ellipse;
052
053        /**
054         * Construct the {@link EllipticalDetectedFace} from the given parameters.
055         * 
056         * @param ellipse
057         *            the ellipse describing the location of the face in the image
058         * @param image
059         *            the image in which the face was detected
060         * @param confidence
061         *            the confidence of the detection
062         */
063        public EllipticalDetectedFace(Ellipse ellipse, FImage image, float confidence) {
064                super();
065
066                this.ellipse = ellipse;
067                this.bounds = ellipse.calculateRegularBoundingBox();
068                this.confidence = confidence;
069
070                if (image != null)
071                        this.facePatch = extractPatch(image, ellipse);
072        }
073
074        private FImage extractPatch(final FImage image, final Ellipse ellipse) {
075                final float x = ellipse.calculateCentroid().getX();
076                final float y = ellipse.calculateCentroid().getY();
077                final double major = ellipse.getMajor();
078                final double minor = ellipse.getMinor();
079
080                final Matrix rot = TransformUtilities.rotationMatrixAboutPoint(
081                                -ellipse.getRotation() + Math.PI / 2,
082                                x,
083                                y);
084
085                final Matrix translate = TransformUtilities.translateMatrix(-(x - minor), -(y - major));
086
087                final Matrix tf = translate.times(rot);
088
089                final FProjectionProcessor pp = new FProjectionProcessor();
090                pp.setMatrix(tf);
091                pp.accumulate(image);
092                return pp.performProjection(0, (int) (2 * minor), 0, (int) (2 * major));
093        }
094
095        @Override
096        public Shape getShape() {
097                return ellipse;
098        }
099}