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.resize;
031
032import org.openimaj.image.FImage;
033import org.openimaj.image.analysis.algorithm.ImageInterpolation;
034import org.openimaj.image.processor.SinglebandImageProcessor;
035
036/**
037 * Bi-cubic interpolation to resize images.
038 * 
039 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
040 * 
041 */
042public class BicubicInterpolation implements SinglebandImageProcessor<Float, FImage> {
043        protected int width;
044        protected int height;
045        protected float scale;
046
047        /**
048         * Construct a new bicubic interpolator. The parameters describe the width
049         * and height of the generated image, together with the scale that goes FROM
050         * the NEW image TO the ORIGINAL.
051         * 
052         * @param width
053         *            new width.
054         * @param height
055         *            new height.
056         * @param scale
057         *            scaling from new size to original.
058         */
059        public BicubicInterpolation(int width, int height, float scale) {
060                this.width = width;
061                this.height = height;
062                this.scale = scale;
063        }
064
065        @Override
066        public void processImage(FImage image) {
067                final FImage newimage = image.newInstance(width, height);
068
069                final float[][] working = new float[4][4];
070
071                for (int y = 0; y < height; y++)
072                        for (int x = 0; x < width; x++)
073                                newimage.pixels[y][x] = ImageInterpolation.InterpolationType.BICUBIC.interpolate(x * scale, y * scale,
074                                                image, working);
075
076                image.internalAssign(newimage);
077        }
078}