001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.demos;
031
032import java.io.IOException;
033import java.net.MalformedURLException;
034import java.net.URL;
035
036import org.openimaj.image.FImage;
037import org.openimaj.image.ImageUtilities;
038import org.openimaj.image.MBFImage;
039import org.openimaj.image.feature.local.engine.DoGSIFTEngine;
040import org.openimaj.image.feature.local.engine.DoGSIFTEngineOptions;
041import org.openimaj.image.processing.convolution.FFastGaussianConvolve;
042import org.openimaj.image.processor.SinglebandImageProcessor;
043
044public class GaussPyr {
045
046        /**
047         * @param args
048         * @throws IOException
049         * @throws MalformedURLException
050         */
051        public static void main(String[] args) throws MalformedURLException, IOException {
052                final MBFImage im = ImageUtilities.readMBF(new URL(
053                                "http://fc01.deviantart.net/fs71/i/2013/102/4/a/erica_the_rhino__update_03_by_c_clancy-d61fznp.jpg"));
054
055                // final int[] ts = { 0, 1, 2, 4, 16, 32 };
056                // for (final int t : ts) {
057                // final long t1 = System.currentTimeMillis();
058                // final MBFImage proc = im.process(new FGaussianConvolve((float)
059                // Math.sqrt(t)));
060                // final long t2 = System.currentTimeMillis();
061                // final MBFImage proc2 = im.process(new FFastGaussianConvolve((float)
062                // Math.sqrt(t), 5));
063                // final long t3 = System.currentTimeMillis();
064                //
065                // System.out.println(t + " slow " + (t2 - t1));
066                // System.out.println(t + " fast " + (t3 - t2));
067                //
068                // DisplayUtilities.display(proc.subtract(proc2).abs().threshold(1e-4f));
069                //
070                // // ImageUtilities.write(proc, new File("/Users/jsh2/Desktop/level" +
071                // // t + ".png"));
072                // }
073
074                final DoGSIFTEngineOptions<FImage> opts = new
075                                DoGSIFTEngineOptions<FImage>();
076                final DoGSIFTEngineOptions<FImage> fastopts = new
077                                DoGSIFTEngineOptions<FImage>()
078                                {
079                                        @Override
080                                        public SinglebandImageProcessor<Float, FImage>
081                                                        createGaussianBlur(float sigma)
082                                        {
083                                                return new FFastGaussianConvolve(sigma, 8);
084                                        }
085                                };
086
087                final DoGSIFTEngine sift = new DoGSIFTEngine(opts);
088                final DoGSIFTEngine fastsift = new DoGSIFTEngine(fastopts);
089                final FImage fimg = im.flatten();
090                for (int i = 0; i < 10; i++) {
091                        final long t1 = System.currentTimeMillis();
092                        System.out.println(sift.findFeatures(fimg).size());
093                        final long t2 = System.currentTimeMillis();
094                        System.out.println(fastsift.findFeatures(fimg).size());
095                        final long t3 = System.currentTimeMillis();
096
097                        System.out.println((t2 - t1) + " " + (t3 - t2));
098                }
099        }
100}