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.feature.local.interest;
031
032import org.openimaj.image.FImage;
033
034public class HarrisIPD extends AbstractStructureTensorIPD {
035        protected float eigenRatio = 0.04f;
036        
037        public HarrisIPD(float detectionScale, float integrationScale) {
038                this(detectionScale, integrationScale, 0.04f);
039        }
040        
041        public HarrisIPD(float detectionScale, float integrationScale, float eigenRatio) {
042                super(detectionScale, integrationScale);
043                this.eigenRatio = eigenRatio;
044        }
045        
046        public HarrisIPD() {
047                this((0.6f*2.5f)*(0.6f*2.5f), 2.5f*2.5f, 0.01f);
048        }
049
050        public HarrisIPD(float f) {
051                super(f);
052        }
053
054        @Override
055        public FImage createInterestPointMap() {
056                FImage det = lxmxblur.multiply(lymyblur).subtract(lxmyblur.multiply(lxmyblur));
057                FImage trace = lxmxblur.add(lymyblur);
058                FImage traceSq = trace.multiply(trace);
059                
060                return det.subtract(traceSq.multiply(eigenRatio)); 
061        }
062
063        @Override
064        public HarrisIPD clone() {
065                HarrisIPD a = (HarrisIPD) super.clone();
066                a.eigenRatio = this.eigenRatio;
067                return a;
068        }
069}