1 /** 2 * Copyright (c) 2011, The University of Southampton and the individual contributors. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * * Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * * Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * * Neither the name of the University of Southampton nor the names of its 16 * contributors may be used to endorse or promote products derived from this 17 * software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 package org.openimaj.image.feature.global; 31 32 import org.openimaj.feature.DoubleFV; 33 import org.openimaj.feature.FeatureVectorProvider; 34 import org.openimaj.image.FImage; 35 import org.openimaj.image.analyser.ImageAnalyser; 36 37 /** 38 * Produce a feature vector that describes the average intensity 39 * distribution across the from left to right. 40 * 41 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk) 42 * 43 */ 44 public class HorizontalIntensityDistribution implements ImageAnalyser<FImage>, FeatureVectorProvider<DoubleFV> { 45 DoubleFV fv; 46 int nbins = 10; 47 48 /** 49 * Construct the {@link HorizontalIntensityDistribution} feature 50 * extractor using the default of 10 equally spaced bins. 51 */ 52 public HorizontalIntensityDistribution() { 53 } 54 55 /** 56 * Construct the {@link HorizontalIntensityDistribution} feature 57 * extractor using the given number of equally spaced bins. 58 * @param nbins number of bins to split the image into 59 */ 60 public HorizontalIntensityDistribution(int nbins) { 61 this.nbins = nbins; 62 } 63 64 @Override 65 public DoubleFV getFeatureVector() { 66 return fv; 67 } 68 69 /* (non-Javadoc) 70 * @see org.openimaj.image.analyser.ImageAnalyser#analyseImage(org.openimaj.image.Image) 71 */ 72 @Override 73 public void analyseImage(FImage image) { 74 fv = new DoubleFV(nbins); 75 int [] counts = new int [nbins]; 76 77 float stripWidth = (float)image.width / (float)nbins; 78 for (int y=0; y<image.height; y++) { 79 for (int x=0; x<image.width; x++) { 80 int bin = (int)(x / stripWidth); 81 82 fv.values[bin] += image.pixels[y][x]; 83 counts[bin]++; 84 } 85 } 86 87 for (int i=0; i<nbins; i++) 88 fv.values[i] /= counts[i]; 89 } 90 } 91