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.pixel.statistics;
31
32 import org.openimaj.image.FImage;
33 import org.openimaj.image.MBFImage;
34
35 /**
36 * A multidimensional histogram calculated from image pixels selected through a mask
37 * (assumes image is in 0-1 range)
38 *
39 * @author Jonathon Hare
40 *
41 */
42 public class MaskingHistogramModel extends HistogramModel {
43 private static final long serialVersionUID = 1L;
44 private FImage mask;
45
46 /**
47 * Construct with the given parameters
48 * @param mask the mask image
49 * @param nbins the number of bins in each dimension for the histograms
50 */
51 public MaskingHistogramModel(FImage mask, int... nbins) {
52 super(nbins);
53
54 this.mask = mask;
55 }
56
57 @Override
58 protected void accum(MBFImage im) {
59 if (im.numBands() != ndims)
60 throw new AssertionError("number of bands must match");
61
62 for (int y=0; y<im.getHeight(); y++) {
63 for (int x=0; x<im.getWidth(); x++) {
64 if (mask.pixels[y][x] != 1)
65 continue;
66
67 int [] bins = new int[ndims];
68
69 for (int i=0; i<ndims; i++) {
70 bins[i] = (int)(im.getBand(i).pixels[y][x] * (histogram.nbins[i]));
71 if (bins[i] >= histogram.nbins[i]) bins[i] = histogram.nbins[i] - 1;
72 }
73
74 int bin = 0;
75 for (int i=0; i<ndims; i++) {
76 int f = 1;
77 for (int j=0; j<i; j++)
78 f *= histogram.nbins[j];
79
80 bin += f * bins[i];
81 }
82
83 histogram.values[bin]++;
84 }
85 }
86 }
87 }