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.analysis.algorithm.ImageInterpolation;
34 import org.openimaj.image.processor.SinglebandImageProcessor;
35
36 /**
37 * Bi-cubic interpolation to resize images.
38 *
39 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
40 *
41 */
42 public class BicubicInterpolation implements SinglebandImageProcessor<Float, FImage> {
43 protected int width;
44 protected int height;
45 protected float scale;
46
47 /**
48 * Construct a new bicubic interpolator. The parameters describe the width
49 * and height of the generated image, together with the scale that goes FROM
50 * the NEW image TO the ORIGINAL.
51 *
52 * @param width
53 * new width.
54 * @param height
55 * new height.
56 * @param scale
57 * scaling from new size to original.
58 */
59 public BicubicInterpolation(int width, int height, float scale) {
60 this.width = width;
61 this.height = height;
62 this.scale = scale;
63 }
64
65 @Override
66 public void processImage(FImage image) {
67 final FImage newimage = image.newInstance(width, height);
68
69 final float[][] working = new float[4][4];
70
71 for (int y = 0; y < height; y++)
72 for (int x = 0; x < width; x++)
73 newimage.pixels[y][x] = ImageInterpolation.InterpolationType.BICUBIC.interpolate(x * scale, y * scale,
74 image, working);
75
76 image.internalAssign(newimage);
77 }
78 }