/*
* This file is part of the LIRE project: http://lire-project.net
* 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
*/
package net.semanticmetadata.lire.imageanalysis.features.local.sift;
/**
* a generic n-dimensional point location
* <p/>
* keeps local coordinates final, application of a model changes the world
* coordinates of the point
* <p/>
* License: GPL
* <p/>
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License 2
* as published by the Free Software Foundation.
* <p/>
* This program 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.
* <p/>
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* <p/>
* NOTE:
* The SIFT-method is protected by U.S. Patent 6,711,293: "Method and
* apparatus for identifying scale invariant features in an image and use of
* same for locating an object in an image" by the University of British
* Columbia. That is, for commercial applications the permission of the author
* is required.
*
* @author Stephan Saalfeld <saalfeld@mpi-cbg.de>
* @version 0.1b
*/
public class Point {
/**
* world coordinates
*/
private float[] w;
final public float[] getW() {
return w;
}
/**
* local coordinates
*/
final private float[] l;
final public float[] getL() {
return l;
}
/**
* Constructor
* <p/>
* sets this.l to the given float[] reference
*
* @param l reference to the local coordinates of the point
*/
public Point(float[] l) {
this.l = l;
// new float[ l.length ];
w = l.clone();
}
/**
* apply a model to the point
* <p/>
* transfers the local coordinates to new world coordinates
*/
final public void apply(Model model) {
w = model.apply(l);
}
/**
* estimate the Euclidean distance of two points in the world
*
* @param p1
* @param p2
* @return Euclidean distance
*/
final public static float distance(Point p1, Point p2) {
double sum = 0.0;
for (int i = 0; i < p1.w.length; ++i) {
double d = p1.w[i] - p2.w[i];
sum += d * d;
}
return (float) Math.sqrt(sum);
}
}