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.examples.image.feature.local; 031 032import java.io.IOException; 033 034import org.openimaj.OpenIMAJ; 035import org.openimaj.feature.local.list.LocalFeatureList; 036import org.openimaj.image.FImage; 037import org.openimaj.image.ImageUtilities; 038import org.openimaj.image.feature.local.engine.DoGSIFTEngine; 039import org.openimaj.image.feature.local.keypoints.Keypoint; 040import org.openimaj.io.IOUtils; 041 042/** 043 * Example showing how to extract SIFT features from an image and write them to 044 * {@link System#out} in a format compatible with David Lowe's <a 045 * href="http://www.cs.ubc.ca/~lowe/keypoints/">keypoint</a> tool. 046 * 047 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk) 048 */ 049public class BasicSIFTExtractionExample { 050 /** 051 * Main method 052 * 053 * @param args 054 * ignored 055 * @throws IOException 056 * if the image can't be read 057 */ 058 public static void main(String[] args) throws IOException { 059 // read an image 060 final FImage image = ImageUtilities.readF(OpenIMAJ.getLogoAsStream()); 061 062 // create the extractor - this can be reused (and is thread-safe) 063 final DoGSIFTEngine engine = new DoGSIFTEngine(); 064 065 // find interest points in the image and extract SIFT descriptors 066 final LocalFeatureList<Keypoint> keypoints = engine.findFeatures(image); 067 068 // print the interest points to stdout 069 IOUtils.writeASCII(System.out, keypoints); 070 } 071}