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 org.openimaj.image.FImage;
033import org.openimaj.image.pixel.ConnectedComponent;
034import org.openimaj.image.processor.ImageProcessor;
035import org.openimaj.image.processor.connectedcomponent.ConnectedComponentProcessor;
036
037/**
038 * Morphological thinning of connected components and (assumed binary) FImages.
039 * 
040 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
041 */
042public class Thin implements ConnectedComponentProcessor, ImageProcessor<FImage> {
043        protected HitAndMiss hitAndMiss;
044        
045        /**
046         * Construct the thinning operator with the given structuring element
047         * @param se the structuring element
048         */
049        public Thin(StructuringElement... se) {
050                this.hitAndMiss = new HitAndMiss(se);
051        }
052        
053        @Override
054        public void process(ConnectedComponent cc) {
055                hitAndMiss.process(cc);
056                
057                cc.getPixels().removeAll(hitAndMiss.outputPixels);
058        }
059
060        /* (non-Javadoc)
061         * @see org.openimaj.image.processor.ImageProcessor#processImage(org.openimaj.image.Image)
062         */
063        @Override
064        public void processImage(FImage image) {
065                FImage newImage = image.process(hitAndMiss, true);
066                
067                for (int y=0; y<newImage.height; y++) {
068                        for (int x=0; x<newImage.width; x++) {
069                                if (newImage.pixels[y][x] == 1) {
070                                        image.pixels[y][x] = 0;
071                                }
072                        }
073                }
074        }
075}