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.docs.tutorial.fund.stream.twitterimages;
031
032import java.io.FileNotFoundException;
033import java.io.UnsupportedEncodingException;
034import java.net.URL;
035import java.util.ArrayList;
036import java.util.List;
037
038import org.openimaj.image.DisplayUtilities;
039import org.openimaj.image.MBFImage;
040import org.openimaj.image.processing.face.detection.DetectedFace;
041import org.openimaj.image.processing.face.detection.HaarCascadeDetector;
042import org.openimaj.stream.functions.ImageFromURL;
043import org.openimaj.stream.functions.ImageSiteURLExtractor;
044import org.openimaj.stream.functions.twitter.TwitterURLExtractor;
045import org.openimaj.stream.provider.twitter.TwitterStreamDataset;
046import org.openimaj.util.api.auth.DefaultTokenFactory;
047import org.openimaj.util.api.auth.common.TwitterAPIToken;
048import org.openimaj.util.function.MultiFunction;
049import org.openimaj.util.function.Operation;
050import org.openimaj.util.stream.Stream;
051
052import twitter4j.Status;
053
054/**
055 * OpenIMAJ Hello world!
056 * 
057 */
058public class App {
059        /**
060         * Main method
061         * 
062         * @param args
063         * @throws FileNotFoundException
064         * @throws UnsupportedEncodingException
065         */
066        public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException {
067                /*
068                 * Construct a twitter stream with an
069                 */
070                final TwitterAPIToken token = DefaultTokenFactory.get(TwitterAPIToken.class);
071                final Stream<Status> stream = new TwitterStreamDataset(token);
072
073                // Get the URLs
074                final Stream<URL> urlStream = stream.map(new TwitterURLExtractor());
075
076                // Transform/filter to get potential image URLs
077                final Stream<URL> imageUrlStream = urlStream.map(new ImageSiteURLExtractor(false));
078
079                // Get images
080                final Stream<MBFImage> imageStream = imageUrlStream.map(ImageFromURL.MBFIMAGE_EXTRACTOR);
081
082                imageStream.map(new MultiFunction<MBFImage, MBFImage>() {
083                        HaarCascadeDetector detector = HaarCascadeDetector.BuiltInCascade.frontalface_default.load();
084
085                        @Override
086                        public List<MBFImage> apply(MBFImage in) {
087                                final List<DetectedFace> detected = detector.detectFaces(in.flatten());
088
089                                final List<MBFImage> faces = new ArrayList<MBFImage>();
090                                for (final DetectedFace face : detected)
091                                {
092                                        faces.add(in.extractROI(face.getBounds()));
093                                }
094
095                                return faces;
096                        }
097                }).forEach(new Operation<MBFImage>() {
098                        @Override
099                        public void perform(MBFImage image) {
100                                DisplayUtilities.displayName(image, "image", true);
101                        }
102                });
103        }
104}