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.objectdetection.hog;
031
032import java.util.List;
033
034import org.openimaj.feature.DoubleFV;
035import org.openimaj.image.FImage;
036import org.openimaj.image.feature.dense.gradient.HOG;
037import org.openimaj.math.geometry.shape.Rectangle;
038import org.openimaj.math.statistics.distribution.Histogram;
039import org.openimaj.ml.annotation.Annotator;
040import org.openimaj.ml.annotation.ScoredAnnotation;
041
042public class HOGClassifier {
043        int width;
044        int height;
045        HOG hogExtractor;
046        Annotator<DoubleFV, Boolean> classifier;
047
048        public void prepare(FImage image) {
049                hogExtractor.analyseImage(image);
050        }
051
052        public double classify(Rectangle current) {
053                final Histogram fv = hogExtractor.getFeatureVector(current);
054
055                final List<ScoredAnnotation<Boolean>> res = classifier.annotate(fv);
056
057                if (res.get(0).annotation) {
058                        return res.get(0).confidence;
059                } else {
060                        return 1 - res.get(0).confidence;
061                }
062        }
063}