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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;
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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;
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60
61 public SlitScanProcessor(int cacheSize)
62 {
63 this.cacheSize = cacheSize;
64 }
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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
96
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();
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110 return frame;
111 }
112
113 private void addToCache(MBFImage frame) {
114 final MBFImage f = frame.clone();
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116 final float[][][] entry = new float[3][][];
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118 entry[0] = f.getBand(0).pixels;
119 entry[1] = f.getBand(1).pixels;
120 entry[2] = f.getBand(2).pixels;
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122 cache.addFirst(entry);
123 }
124 }