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.demos;
31
32 import java.io.IOException;
33 import java.net.MalformedURLException;
34 import java.net.URL;
35
36 import org.openimaj.image.FImage;
37 import org.openimaj.image.ImageUtilities;
38 import org.openimaj.image.MBFImage;
39 import org.openimaj.image.feature.local.engine.DoGSIFTEngine;
40 import org.openimaj.image.feature.local.engine.DoGSIFTEngineOptions;
41 import org.openimaj.image.processing.convolution.FFastGaussianConvolve;
42 import org.openimaj.image.processor.SinglebandImageProcessor;
43
44 public class GaussPyr {
45
46 /**
47 * @param args
48 * @throws IOException
49 * @throws MalformedURLException
50 */
51 public static void main(String[] args) throws MalformedURLException, IOException {
52 final MBFImage im = ImageUtilities.readMBF(new URL(
53 "http://fc01.deviantart.net/fs71/i/2013/102/4/a/erica_the_rhino__update_03_by_c_clancy-d61fznp.jpg"));
54
55 // final int[] ts = { 0, 1, 2, 4, 16, 32 };
56 // for (final int t : ts) {
57 // final long t1 = System.currentTimeMillis();
58 // final MBFImage proc = im.process(new FGaussianConvolve((float)
59 // Math.sqrt(t)));
60 // final long t2 = System.currentTimeMillis();
61 // final MBFImage proc2 = im.process(new FFastGaussianConvolve((float)
62 // Math.sqrt(t), 5));
63 // final long t3 = System.currentTimeMillis();
64 //
65 // System.out.println(t + " slow " + (t2 - t1));
66 // System.out.println(t + " fast " + (t3 - t2));
67 //
68 // DisplayUtilities.display(proc.subtract(proc2).abs().threshold(1e-4f));
69 //
70 // // ImageUtilities.write(proc, new File("/Users/jsh2/Desktop/level" +
71 // // t + ".png"));
72 // }
73
74 final DoGSIFTEngineOptions<FImage> opts = new
75 DoGSIFTEngineOptions<FImage>();
76 final DoGSIFTEngineOptions<FImage> fastopts = new
77 DoGSIFTEngineOptions<FImage>()
78 {
79 @Override
80 public SinglebandImageProcessor<Float, FImage>
81 createGaussianBlur(float sigma)
82 {
83 return new FFastGaussianConvolve(sigma, 8);
84 }
85 };
86
87 final DoGSIFTEngine sift = new DoGSIFTEngine(opts);
88 final DoGSIFTEngine fastsift = new DoGSIFTEngine(fastopts);
89 final FImage fimg = im.flatten();
90 for (int i = 0; i < 10; i++) {
91 final long t1 = System.currentTimeMillis();
92 System.out.println(sift.findFeatures(fimg).size());
93 final long t2 = System.currentTimeMillis();
94 System.out.println(fastsift.findFeatures(fimg).size());
95 final long t3 = System.currentTimeMillis();
96
97 System.out.println((t2 - t1) + " " + (t3 - t2));
98 }
99 }
100 }