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.convolution.filterbank;
031
032import org.openimaj.image.FImage;
033
034/**
035 * Implementation of the MR8 filter bank described at:
036 * http://www.robots.ox.ac.uk/~vgg/research/texclass/filters.html
037 * 
038 * This is the naive implementation and as such is quite slow.
039 * 
040 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
041 */
042public class MR8FilterBank extends RootFilterSetFilterBank {
043
044        /*
045         * (non-Javadoc)
046         * 
047         * @see
048         * org.openimaj.image.processor.ImageProcessor#processImage(org.openimaj
049         * .image.Image)
050         */
051        @Override
052        public void analyseImage(FImage image) {
053                super.analyseImage(image);
054
055                final FImage[] allresponses = responses;
056                responses = new FImage[8];
057
058                int allIndex = 0;
059                int idx = 0;
060                for (int type = 0; type < 2; type++) {
061                        for (int scale = 0; scale < SCALES.length; scale++) {
062                                responses[idx] = allresponses[allIndex];
063                                allIndex++;
064
065                                for (int orient = 1; orient < NUM_ORIENTATIONS; orient++) {
066                                        for (int y = 0; y < image.height; y++) {
067                                                for (int x = 0; x < image.width; x++) {
068                                                        responses[idx].pixels[y][x] = Math.max(responses[idx].pixels[y][x],
069                                                                        allresponses[allIndex].pixels[y][x]);
070                                                }
071                                        }
072
073                                        allIndex++;
074                                }
075
076                                idx++;
077                        }
078                }
079
080                responses[idx++] = allresponses[allIndex++];
081                responses[idx++] = allresponses[allIndex++];
082        }
083}