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.processing.morphology;
31
32 import org.openimaj.image.FImage;
33 import org.openimaj.image.pixel.ConnectedComponent;
34 import org.openimaj.image.processor.ImageProcessor;
35 import org.openimaj.image.processor.connectedcomponent.ConnectedComponentProcessor;
36
37 /**
38 * Morphological sequential thinning of connected components and (assumed binary) FImages.
39 *
40 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
41 */
42 public class SequentialThin implements ConnectedComponentProcessor, ImageProcessor<FImage> {
43 protected HitAndMiss hitAndMiss;
44 protected int niter = -1;
45
46 /**
47 * Construct the sequential thin operator with the given structuring elements
48 * @param se the structuring elements
49 */
50 public SequentialThin(StructuringElement... se) {
51 this.hitAndMiss = new HitAndMiss(se);
52 }
53
54 /**
55 * Construct the sequential thin operator with the given structuring elements
56 * and number of iterations
57 * @param niter number of iterations to apply
58 * @param se the structuring elements
59 */
60 public SequentialThin(int niter, StructuringElement... se) {
61 this.hitAndMiss = new HitAndMiss(se);
62 this.niter = niter;
63 }
64
65 @Override
66 public void process(ConnectedComponent cc) {
67 for (int i=niter; i!=0; i--) {
68 hitAndMiss.process(cc);
69
70 if (hitAndMiss.outputPixels.size() == 0)
71 break;
72
73 cc.getPixels().removeAll(hitAndMiss.outputPixels);
74 }
75 }
76
77 /* (non-Javadoc)
78 * @see org.openimaj.image.processor.ImageProcessor#processImage(org.openimaj.image.Image)
79 */
80 @Override
81 public void processImage(FImage image) {
82 for (int i=niter; i!=0; i--) {
83 FImage newImage = image.process(hitAndMiss, true);
84
85 int count = 0;
86 for (int y=0; y<newImage.height; y++) {
87 for (int x=0; x<newImage.width; x++) {
88 if (newImage.pixels[y][x] == 1) {
89 count++;
90 image.pixels[y][x] = 0;
91 }
92 }
93 }
94
95 if (count == 0)
96 break;
97 }
98 }
99 }