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.detector.pyramid;
031
032import org.openimaj.image.FImage;
033import org.openimaj.image.Image;
034import org.openimaj.image.analysis.pyramid.Octave;
035import org.openimaj.image.analysis.pyramid.gaussian.GaussianOctave;
036import org.openimaj.image.analysis.pyramid.gaussian.GaussianPyramidOptions;
037import org.openimaj.image.processor.SinglebandImageProcessor;
038
039/**
040 * An {@link AbstractOctaveInterestPointFinder} that detects points on a regular
041 * grid.
042 * 
043 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
044 * 
045 * @param <OCTAVE>
046 *            Type of underlying {@link Octave}
047 * @param <IMAGE>
048 *            Type of underlying {@link Image}
049 */
050public class BasicOctaveGridFinder<OCTAVE extends Octave<?, ?, IMAGE>, IMAGE extends Image<?, IMAGE> & SinglebandImageProcessor.Processable<Float, FImage, IMAGE>>
051                extends AbstractOctaveInterestPointFinder<OCTAVE, IMAGE>
052{
053        int skipX = 50;
054        int skipY = 50;
055        int borderX = 5;
056        int borderY = 5;
057        int startScaleIndex = 1;
058        int scaleSkip = 1;
059        int stopScaleIndex = 2;
060
061        @SuppressWarnings("unchecked")
062        @Override
063        public void process(OCTAVE octave) {
064                this.octave = octave;
065                int scales = 0;
066
067                if (octave instanceof GaussianOctave) {
068                        scales = ((GaussianPyramidOptions<IMAGE>) octave.options).getScales();
069                }
070
071                final IMAGE[] images = octave.images;
072                final int height = images[0].getHeight();
073                final int width = images[0].getWidth();
074
075                // search through the scale-space images, leaving a border
076                for (currentScaleIndex = startScaleIndex; currentScaleIndex < stopScaleIndex; currentScaleIndex += scaleSkip) {
077                        for (int y = borderY; y < height - borderY; y += skipY) {
078                                for (int x = borderX; x < width - borderX; x += skipX) {
079                                        float octaveScale = currentScaleIndex;
080
081                                        if (octave instanceof GaussianOctave) {
082                                                octaveScale = ((GaussianPyramidOptions<IMAGE>) octave.options).getInitialSigma()
083                                                                * (float) Math.pow(2.0, currentScaleIndex / scales);
084                                        }
085
086                                        listener.foundInterestPoint(this, x, y, octaveScale);
087                                }
088                        }
089                }
090        }
091}