001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.image.processing.extraction;
031
032import org.openimaj.image.FImage;
033import org.openimaj.image.processing.transform.ProjectionProcessor;
034import org.openimaj.image.processor.ImageProcessor;
035import org.openimaj.math.geometry.point.Point2dImpl;
036import org.openimaj.math.geometry.shape.Ellipse;
037import org.openimaj.math.geometry.shape.Polygon;
038import org.openimaj.math.geometry.transforms.TransformUtilities;
039
040import Jama.Matrix;
041
042/**
043 * Extract a polygon from an image into a new image.
044 * The ellipse fitting the polygon is extracted.
045 * The rotation of the ellipse is used to orientate the polygon.
046 * The major and minor axis of the ellipse form the dimensions of the output FImage
047 * The {@link ProjectionProcessor} is used to perform the extraction. Concretely,
048 * the projection processor is set up with a transform matrix combining the rotation of
049 * the ellipse and a translation using the COG of the ellipse.
050 *
051 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
052 *
053 */
054public class OrientedPolygonExtractionProcessor implements ImageProcessor<FImage>{
055
056        private final float background;
057        private final Ellipse polygonEllipse;
058
059        /**
060         * @param polygon
061         * @param background
062         */
063        public OrientedPolygonExtractionProcessor(final Polygon polygon, final float background) {
064                this.polygonEllipse = polygon.toEllipse();
065                this.background = background;
066        }
067
068        @Override
069        public void processImage(final FImage image) {
070                image.internalAssign(this.orientedBoundingBoxProjection(image));
071        }
072
073        private FImage orientedBoundingBoxProjection(final FImage image) {
074                final ProjectionProcessor<Float, FImage> pp = new ProjectionProcessor<Float,FImage>();
075                Matrix trans = Matrix.identity(3, 3);
076                trans = trans.times(TransformUtilities.rotationMatrix(-this.polygonEllipse.getRotation()));
077                trans = trans.times(
078                        TransformUtilities.translateToPointMatrix(
079                                        this.polygonEllipse.calculateCentroid(),
080                                        new Point2dImpl(0,0))
081                );
082                pp.setMatrix(trans);
083                pp.accumulate(image);
084                return pp.performProjection(
085                                (int)-this.polygonEllipse.getMajor(),(int)this.polygonEllipse.getMajor(),
086                                (int)-this.polygonEllipse.getMinor(),(int)this.polygonEllipse.getMinor(),
087                                this.background
088                );
089        }
090
091}