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.extraction;
31
32 import org.openimaj.image.FImage;
33 import org.openimaj.image.processing.transform.ProjectionProcessor;
34 import org.openimaj.image.processor.ImageProcessor;
35 import org.openimaj.math.geometry.point.Point2dImpl;
36 import org.openimaj.math.geometry.shape.Ellipse;
37 import org.openimaj.math.geometry.shape.Polygon;
38 import org.openimaj.math.geometry.transforms.TransformUtilities;
39
40 import Jama.Matrix;
41
42 /**
43 * Extract a polygon from an image into a new image.
44 * The ellipse fitting the polygon is extracted.
45 * The rotation of the ellipse is used to orientate the polygon.
46 * The major and minor axis of the ellipse form the dimensions of the output FImage
47 * The {@link ProjectionProcessor} is used to perform the extraction. Concretely,
48 * the projection processor is set up with a transform matrix combining the rotation of
49 * the ellipse and a translation using the COG of the ellipse.
50 *
51 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
52 *
53 */
54 public class OrientedPolygonExtractionProcessor implements ImageProcessor<FImage>{
55
56 private final float background;
57 private final Ellipse polygonEllipse;
58
59 /**
60 * @param polygon
61 * @param background
62 */
63 public OrientedPolygonExtractionProcessor(final Polygon polygon, final float background) {
64 this.polygonEllipse = polygon.toEllipse();
65 this.background = background;
66 }
67
68 @Override
69 public void processImage(final FImage image) {
70 image.internalAssign(this.orientedBoundingBoxProjection(image));
71 }
72
73 private FImage orientedBoundingBoxProjection(final FImage image) {
74 final ProjectionProcessor<Float, FImage> pp = new ProjectionProcessor<Float,FImage>();
75 Matrix trans = Matrix.identity(3, 3);
76 trans = trans.times(TransformUtilities.rotationMatrix(-this.polygonEllipse.getRotation()));
77 trans = trans.times(
78 TransformUtilities.translateToPointMatrix(
79 this.polygonEllipse.calculateCentroid(),
80 new Point2dImpl(0,0))
81 );
82 pp.setMatrix(trans);
83 pp.accumulate(image);
84 return pp.performProjection(
85 (int)-this.polygonEllipse.getMajor(),(int)this.polygonEllipse.getMajor(),
86 (int)-this.polygonEllipse.getMinor(),(int)this.polygonEllipse.getMinor(),
87 this.background
88 );
89 }
90
91 }