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.mediaeval13.placing;
031
032import gnu.trove.list.array.TLongArrayList;
033
034import java.io.BufferedReader;
035import java.io.File;
036import java.io.FileNotFoundException;
037import java.io.FileReader;
038import java.io.IOException;
039import java.util.ArrayList;
040import java.util.List;
041
042import org.apache.lucene.index.DirectoryReader;
043import org.apache.lucene.index.IndexReader;
044import org.apache.lucene.search.IndexSearcher;
045import org.apache.lucene.store.Directory;
046import org.apache.lucene.store.MMapDirectory;
047import org.openimaj.image.FImage;
048
049public class Utils {
050        private Utils() {
051        }
052
053        /**
054         * Read the lat-lng file into a list of {@link GeoLocation}s
055         * 
056         * @param latlngFile
057         * @param skipIds
058         * @return
059         * @throws FileNotFoundException
060         * @throws IOException
061         */
062        public static List<GeoLocation> readLatLng(File latlngFile, TLongArrayList skipIds) throws FileNotFoundException,
063                        IOException
064        {
065                final ArrayList<GeoLocation> pts = new ArrayList<GeoLocation>();
066                BufferedReader br = null;
067                try {
068                        br = new BufferedReader(new FileReader(latlngFile));
069
070                        String line;
071                        while ((line = br.readLine()) != null) {
072                                try {
073                                        final String[] parts = line.split(" ");
074
075                                        if (parts.length != 3)
076                                                continue;
077
078                                        final long id = Long.parseLong(parts[0]);
079                                        final double lat = Double.parseDouble(parts[1]);
080                                        final double lng = Double.parseDouble(parts[2]);
081
082                                        if (skipIds.binarySearch(id) < 0)
083                                                pts.add(new GeoLocation(lat, lng));
084                                } catch (final NumberFormatException nfe) {
085                                        // ignore line
086                                }
087                        }
088                } finally {
089                        if (br != null)
090                                br.close();
091                }
092                return pts;
093        }
094
095        public static FImage createPrior(File latlngFile, TLongArrayList skipIds) throws IOException {
096                return createPrior(latlngFile, skipIds, true);
097        }
098
099        public static FImage createPrior(File latlngFile, TLongArrayList skipIds, boolean norm) throws IOException {
100                final FImage img = new FImage(360, 180);
101                img.fill(1f / (img.height * img.width));
102
103                if (latlngFile == null)
104                        return img;
105
106                final BufferedReader br = new BufferedReader(new FileReader(latlngFile));
107
108                String line;
109                br.readLine();
110                while ((line = br.readLine()) != null) {
111                        final String[] parts = line.split(" ");
112
113                        if (skipIds.contains(Long.parseLong(parts[0])))
114                                continue;
115
116                        final float x = Float.parseFloat(parts[2]) + 180;
117                        final float y = 90 - Float.parseFloat(parts[1]);
118
119                        img.pixels[(int) (y * img.height / 180.001)][(int) (x * img.width / 360.001)]++;
120                }
121                br.close();
122
123                if (norm)
124                        logNorm(img);
125
126                return img;
127        }
128
129        public static void logNorm(final FImage img) {
130                final double norm = img.sum();
131                for (int y = 0; y < img.height; y++)
132                        for (int x = 0; x < img.width; x++)
133                                img.pixels[y][x] = (float) Math.log(img.pixels[y][x] / norm);
134        }
135
136        public static IndexSearcher loadLuceneIndex(File file) throws IOException {
137                final Directory directory = new MMapDirectory(file);
138                final IndexReader reader = DirectoryReader.open(directory);
139                final IndexSearcher luceneIndex = new IndexSearcher(reader);
140                return luceneIndex;
141        }
142}