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 import org.openimaj.math.statistics.distribution.MultidimensionalHistogram;
35
36
37 /**
38 * An array of multidimensional histograms calculated from image pixels using a mask
39 * (assumes image is in 0-1 range)
40 *
41 * @author Jonathon Hare
42 *
43 */
44 public class MaskingBlockHistogramModel extends BlockHistogramModel {
45 private static final long serialVersionUID = 1L;
46 private FImage mask;
47
48 /**
49 * Construct with the given parameters
50 * @param mask the mask image
51 * @param blocks_x the number of blocks in the x-direction
52 * @param blocks_y the number of blocks in the y-direction
53 * @param nbins the number of bins in each dimension for the histograms
54 */
55 public MaskingBlockHistogramModel(FImage mask, int blocks_x, int blocks_y, int... nbins) {
56 super(blocks_x, blocks_y, nbins);
57
58 this.mask = mask;
59 }
60
61 @Override
62 protected void accum(MBFImage im, int bx, int by) {
63 assert (im.numBands() == ndims);
64
65 MultidimensionalHistogram histogram = histograms[by][bx];
66 int height = im.getHeight();
67 int width = im.getWidth();
68
69 int cols_per_block = width / blocks_x;
70 int startx = bx*cols_per_block;
71 int stopx = (1+bx)*cols_per_block;
72
73 int rows_per_block = height / blocks_y;
74 int starty = by*rows_per_block;
75 int stopy = (1+by)*rows_per_block;
76
77 if (stopx >= width) stopx = width;
78 if (stopy >= height) stopy = height;
79
80 for (int y=starty; y<stopy; y++) {
81 for (int x=startx; x<stopx; x++) {
82 if (mask.pixels[y][x] != 1)
83 continue;
84
85 int [] bins = new int[ndims];
86
87 for (int i=0; i<ndims; i++) {
88 bins[i] = (int)(im.getBand(i).pixels[y][x] * (histogram.nbins[i]));
89 if (bins[i] >= histogram.nbins[i]) bins[i] = histogram.nbins[i] - 1;
90 }
91
92 int bin = 0;
93 for (int i=0; i<ndims; i++) {
94 int f = 1;
95 for (int j=0; j<i; j++)
96 f *= histogram.nbins[j];
97
98 bin += f * bins[i];
99 }
100
101 histogram.values[bin]++;
102 }
103 }
104 }
105 }