package edu.stanford.rsl.conrad.geometry.motion.timewarp;
import ij.ImageJ;
import edu.stanford.rsl.conrad.utils.VisualizationUtil;
/**
* Implements a regular periodic time warping. Internally the time is mapped to 0.5 - 0.5* cos(time**2Math.PI). At time = 0.5 the maximal motion is achieved. At time = 1 the motion is returned to the original position.<BR><BR>
* <img src = "http://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Sine_cosine_one_period.svg/600px-Sine_cosine_one_period.svg.png" alt="Sine Function">
*
* @author akmaier
*
*/
public class PeriodicTimeWarper extends TimeWarper {
/**
*
*/
private static final long serialVersionUID = 7128385122818413431L;
@Override
public double warpTime(double time) {
return 0.5 - 0.5 * Math.cos(time*2*Math.PI);
}
public static void main (String [] args){
TimeWarper warp = new PeriodicTimeWarper();
double [] values = new double [100];
for (int i =0; i< 100; i++){
values[i] = warp.warpTime(((double)i)/100);
}
VisualizationUtil.createPlot(values).show();
new ImageJ();
}
}
/*
* Copyright (C) 2010-2014 Andreas Maier
* CONRAD is developed as an Open Source project under the GNU General Public License (GPL).
*/