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.workinprogress.accel;
031
032import java.io.File;
033import java.io.IOException;
034
035import org.openimaj.image.DisplayUtilities;
036import org.openimaj.image.FImage;
037import org.openimaj.image.ImageUtilities;
038import org.openimaj.image.processing.convolution.FSobelMagnitude;
039import org.openimaj.image.processor.Processor;
040
041public class MovingEdges {
042        FImage[] E;
043        FImage[] totalHeat;
044        FImage[] heatOut;
045
046        public MovingEdges(FImage[] sequence, Processor<FImage> proc, int niters, float kappa) {
047                E = new FImage[sequence.length];
048                heatOut = new FImage[sequence.length - 2];
049                totalHeat = new FImage[sequence.length - 2];
050
051                for (int i = 0; i < sequence.length; i++) {
052                        E[i] = sequence[i].process(proc);
053                }
054
055                for (int i = 0; i < sequence.length - 2; i++) {
056                        totalHeat[i] = new FImage(E[0].width, E[0].height);
057                        heatOut[i] = new FImage(E[0].width, E[0].height);
058                }
059
060                evolve(sequence, niters, kappa);
061        }
062
063        private void evolve(FImage[] sequence, int niters, float kappa) {
064                final int width = E[0].width;
065                final int height = E[0].height;
066
067                for (int i = 0; i < niters; i++) {
068                        FImage last = E[0].clone();
069
070                        for (int f = 1; f < sequence.length - 1; f++) {
071                                final FImage delta = delta(last, E[f], E[f + 1]);
072                                last = E[f].clone();
073
074                                for (int y = 0; y < height; y++) {
075                                        for (int x = 0; x < width; x++) {
076                                                final float d = delta.pixels[y][x];
077                                                E[f].pixels[y][x] += kappa * d;
078
079                                                totalHeat[f - 1].pixels[y][x] += Math.abs(kappa * d);
080                                                if (d < 0)
081                                                        heatOut[f - 1].pixels[y][x] += Math.abs(kappa * d);
082                                        }
083                                }
084                        }
085                }
086        }
087
088        private FImage delta(FImage enm, FImage en, FImage enp) {
089                final FImage delta = new FImage(en.width, en.height);
090                for (int y = 0; y < delta.height; y++) {
091                        for (int x = 0; x < delta.width; x++) {
092                                delta.pixels[y][x] = enp.pixels[y][x] + enm.pixels[y][x] - 2 * en.pixels[y][x];
093                        }
094                }
095
096                return delta;
097        }
098
099        public static void main(String[] args) throws IOException, InterruptedException {
100                final FImage[] sequence = new FImage[10];
101                for (int i = 0; i < sequence.length; i++) {
102                        sequence[i] = ImageUtilities.readF(new File("/Users/jon/pendulum+circle+notexture/frame_" + i + ".png"));
103                }
104
105                final MovingEdges me = new MovingEdges(sequence, new FSobelMagnitude(), 10, 0.45f);
106
107                for (int i = 0; i < sequence.length - 2; i++) {
108                        DisplayUtilities.display(me.heatOut[i].clone().normalise());
109                        // DisplayUtilities.display(me.totalHeat[i].clone().normalise());
110                }
111                // for (int i = 0; i < sequence.length; i++) {
112                // DisplayUtilities.display(me.E[i].clone().normalise());
113                // }
114        }
115}