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