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.contour;
31
32 import org.openimaj.image.FImage;
33 import org.openimaj.image.pixel.Pixel;
34 import org.openimaj.util.function.Operation;
35 import org.openimaj.util.pair.IndependentPair;
36
37 /**
38 * The Moore Neighborhood contour tracing strategy as described by <a href=
39 * "http://www.imageprocessingplace.com/downloads_V3/root_downloads/tutorials/contour_tracing_Abeer_George_Ghuneim/moore.html"
40 * >this tutorial</a>.
41 *
42 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
43 *
44 */
45 public class MooreNeighborStrategy extends ContourFollowingStrategy {
46
47 @Override
48 public void contour(FImage image, Pixel start, Pixel from, final Operation<Pixel> operation) {
49 directedContour(image, start, from, new Operation<IndependentPair<Pixel, Direction>>() {
50 @Override
51 public void perform(IndependentPair<Pixel, Direction> object) {
52 operation.perform(object.firstObject());
53 }
54 });
55 }
56
57 /**
58 * Directed contour following.
59 *
60 * @param image
61 * the image
62 * @param start
63 * the starting point on the contour
64 * @param from
65 * the pixel that was not a contour
66 * @param operation
67 * the operation to perform
68 */
69 public void directedContour(FImage image, Pixel start, Pixel from,
70 Operation<IndependentPair<Pixel, Direction>> operation)
71 {
72 Pixel p = start;
73 if (image.pixels[start.y][start.x] == 0)
74 return;
75 Direction cdirStart = Direction.fromTo(p, from);
76 operation.perform(IndependentPair.pair(start, cdirStart));
77 final Direction firstCdir = cdirStart;
78 Direction cdir = cdirStart.clockwise();
79 int startCount = 0;
80 while (cdir != cdirStart) {
81 final Pixel c = cdir.active(image, p);
82 if (c != null) {
83 cdirStart = cdir.clockwiseEntryDirection();
84 if (c.equals(start)) {
85 startCount++;
86 if (startCount >= 2 || firstCdir == cdirStart) {
87 return;
88 }
89
90 }
91 operation.perform(IndependentPair.pair(c, cdirStart));
92 p = c;
93 cdir = cdirStart.clockwise();
94 }
95 else {
96 cdir = cdir.clockwise();
97 }
98 }
99 }
100
101 }