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.resize;
31
32 import org.openimaj.image.FImage;
33 import org.openimaj.image.processor.SinglebandImageProcessor;
34
35 /**
36 * Simple bi-linear interpolation to resize images.
37 *
38 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
39 *
40 */
41 public class BilinearInterpolation implements SinglebandImageProcessor<Float, FImage> {
42 protected int width;
43 protected int height;
44 protected float scale;
45
46 /**
47 * Construct a new bilinear interpolator. The parameters
48 * describe the width and height of the generated image,
49 * together with the scale that goes FROM the NEW image TO
50 * the ORIGINAL.
51 *
52 * @param width new width.
53 * @param height new height.
54 * @param scale scaling from new size to original.
55 */
56 public BilinearInterpolation(int width, int height, float scale) {
57 this.width = width;
58 this.height = height;
59 this.scale = scale;
60 }
61
62 @Override
63 public void processImage(FImage image) {
64 FImage newimage = image.newInstance(width, height);
65
66 for (int y=0; y<height; y++)
67 for (int x=0; x<width; x++)
68 newimage.pixels[y][x] = image.getPixelInterp(x*scale, y*scale);
69
70 image.internalAssign(newimage);
71 }
72 }