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.morphology;
031
032import java.util.HashSet;
033import java.util.Set;
034
035import org.openimaj.image.FImage;
036import org.openimaj.image.pixel.ConnectedComponent;
037import org.openimaj.image.pixel.Pixel;
038import org.openimaj.image.processing.algorithm.MaxFilter;
039import org.openimaj.image.processor.KernelProcessor;
040import org.openimaj.image.processor.connectedcomponent.ConnectedComponentProcessor;
041import org.openimaj.math.geometry.shape.Rectangle;
042
043/**
044 * Morphological dilation of connected components and (assumed binary) FImages.
045 * See {@link MaxFilter} for greyscale dilation.
046 *
047 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
048 */
049public class Dilate implements ConnectedComponentProcessor, KernelProcessor<Float, FImage> {
050        protected StructuringElement element;
051        protected int cx;
052        protected int cy;
053        protected int sw;
054        protected int sh;
055
056        /**
057         * Construct the dilate operator with the given structuring element
058         *
059         * @param se
060         *            the structuring element
061         */
062        public Dilate(StructuringElement se) {
063                this.element = se;
064
065                final int[] sz = se.size();
066                sw = sz[0];
067                sh = sz[1];
068                cx = sw / 2;
069                cy = sh / 2;
070        }
071
072        /**
073         * Construct the dilate operator with a BOX structuring element
074         */
075        public Dilate() {
076                this(StructuringElement.BOX);
077        }
078
079        @Override
080        public void process(ConnectedComponent cc) {
081                // Dilate a connected component
082                final Rectangle cc_bb = cc.calculateRegularBoundingBox();
083
084                final Set<Pixel> newPixels = new HashSet<Pixel>();
085                for (int j = (int) (cc_bb.y - sh); j <= cc_bb.y + sh + cc_bb.height; j++) {
086                        for (int i = (int) (cc_bb.x - sw); i <= cc_bb.x + sw + cc_bb.width; i++) {
087                                final Pixel p = new Pixel(i, j);
088
089                                if (element.intersect(p, cc.getPixels()).size() >= 1) {
090                                        newPixels.add(p);
091                                }
092                        }
093                }
094
095                cc.getPixels().addAll(newPixels);
096        }
097
098        @Override
099        public int getKernelHeight() {
100                return sh;
101        }
102
103        @Override
104        public int getKernelWidth() {
105                return sw;
106        }
107
108        @Override
109        public Float processKernel(FImage patch) {
110                for (final Pixel p : element.positive) {
111                        final int px = cx - p.x;
112                        final int py = cy - p.y;
113                        if (px >= 0 && py >= 0 && px < sw && py < sh && patch.pixels[py][px] == 1) {
114                                return 1f;
115                        }
116                }
117
118                for (final Pixel p : element.negative) {
119                        final int px = cx - p.x;
120                        final int py = cy - p.y;
121                        if (px >= 0 && py >= 0 && px < sw && py < sh && patch.pixels[py][px] == 0)
122                                return 1f;
123                }
124
125                return patch.pixels[cy][cx];
126        }
127
128        /**
129         * Apply dilation some number of times to an image with the default
130         * {@link StructuringElement#BOX} element
131         *
132         * @param img
133         *            the image
134         * @param times
135         *            the number of times to apply the dilation
136         */
137        public static void dilate(FImage img, int times) {
138                final Dilate d = new Dilate();
139                for (int i = 0; i < times; i++)
140                        img.processInplace(d);
141        }
142}