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.video.processing.effects;
31
32 import java.util.LinkedList;
33
34 import org.openimaj.image.FImage;
35 import org.openimaj.image.MBFImage;
36 import org.openimaj.image.colour.RGBColour;
37 import org.openimaj.image.processing.convolution.FGaussianConvolve;
38 import org.openimaj.image.processing.convolution.FImageConvolveSeparable;
39 import org.openimaj.video.Video;
40 import org.openimaj.video.processor.VideoProcessor;
41
42 /**
43 * {@link VideoProcessor} that produces a slit-scan effect.
44 *
45 * @author Sina Samangooei (ss@ecs.soton.ac.uk)
46 *
47 */
48 public class SlitScanProcessor extends VideoProcessor<MBFImage> {
49 LinkedList<float[][][]> cache = new LinkedList<float[][][]>();
50
51 final float[] blurKern = FGaussianConvolve.makeKernel(0.5f);
52 int cacheSize = 240;
53
54 /**
55 * Default constructor for using the video processor in an ad-hoc manner.
56 *
57 * @param cacheSize
58 * The number of frames to retain for creating the slitscan
59 * effect
60 */
61 public SlitScanProcessor(int cacheSize)
62 {
63 this.cacheSize = cacheSize;
64 }
65
66 /**
67 * Constructor for creating a video processor which is chainable.
68 *
69 * @param video
70 * The video to process
71 * @param cacheSize
72 * The number of frames to retain for creating the slitscan
73 * effect
74 */
75 public SlitScanProcessor(Video<MBFImage> video, int cacheSize) {
76 super(video);
77 this.cacheSize = cacheSize;
78 }
79
80 @Override
81 public MBFImage processFrame(MBFImage frame) {
82 addToCache(frame);
83
84 final int height = frame.getHeight();
85 final float prop = (float) (cacheSize) / height;
86 frame.fill(RGBColour.BLACK);
87 final float[][] framer = frame.getBand(0).pixels;
88 final float[][] frameg = frame.getBand(1).pixels;
89 final float[][] frameb = frame.getBand(2).pixels;
90 for (int y = 0; y < height; y++) {
91 final int index = (int) (y * prop);
92 if (index >= cache.size()) {
93 break;
94 }
95 // System.out.println("y = " + y);
96 // System.out.println("index = " + index);
97 final float[][][] cacheImage = cache.get(index);
98 System.arraycopy(cacheImage[0][y], 0, framer[y], 0, cacheImage[0][y].length);
99 System.arraycopy(cacheImage[1][y], 0, frameg[y], 0, cacheImage[1][y].length);
100 System.arraycopy(cacheImage[2][y], 0, frameb[y], 0, cacheImage[2][y].length);
101 }
102
103 for (final FImage f : frame.bands) {
104 FImageConvolveSeparable.convolveVertical(f, blurKern);
105 }
106
107 if (cache.size() >= cacheSize)
108 cache.removeLast();
109
110 return frame;
111 }
112
113 private void addToCache(MBFImage frame) {
114 final MBFImage f = frame.clone();
115
116 final float[][][] entry = new float[3][][];
117
118 entry[0] = f.getBand(0).pixels;
119 entry[1] = f.getBand(1).pixels;
120 entry[2] = f.getBand(2).pixels;
121
122 cache.addFirst(entry);
123 }
124 }