Here you can find the source of normalizeL2(double[] histogram)
| Parameter | Description |
|---|---|
| histogram | a parameter |
public static double[] normalizeL2(double[] histogram)
//package com.java2s; /*//www . j a v a 2 s .co m * This file is part of the LIRE project: http://www.semanticmetadata.net/lire * LIRE is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * LIRE is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with LIRE; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * We kindly ask you to refer the any or one of the following publications in * any publication mentioning or employing Lire: * * Lux Mathias, Savvas A. Chatzichristofis. Lire: Lucene Image Retrieval ? * An Extensible Java CBIR Library. In proceedings of the 16th ACM International * Conference on Multimedia, pp. 1085-1088, Vancouver, Canada, 2008 * URL: http://doi.acm.org/10.1145/1459359.1459577 * * Lux Mathias. Content Based Image Retrieval with LIRE. In proceedings of the * 19th ACM International Conference on Multimedia, pp. 735-738, Scottsdale, * Arizona, USA, 2011 * URL: http://dl.acm.org/citation.cfm?id=2072432 * * Mathias Lux, Oge Marques. Visual Information Retrieval using Java and LIRE * Morgan & Claypool, 2013 * URL: http://www.morganclaypool.com/doi/abs/10.2200/S00468ED1V01Y201301ICR025 * * Copyright statement: * ==================== * (c) 2002-2013 by Mathias Lux (mathias@juggle.at) * http://www.semanticmetadata.net/lire, http://www.lire-project.net * * Updated: 07.08.13 12:18 */ public class Main { /** * Euclidean normalization of a double[] histogram. // todo: make it faster and less memory consuming ... * @param histogram * @return */ public static double[] normalizeL2(double[] histogram) { double[] result = new double[histogram.length]; double len = 0; for (int i = 0; i < histogram.length; i++) { len += histogram[i] * histogram[i]; } len = Math.sqrt(len); for (int i = 0; i < histogram.length; i++) { if (histogram[i] != 0) result[i] = ((double) histogram[i]) / len; else result[i] = 0; } return result; } }