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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkUnaryMedialNodeMetric.txx,v $
Language: C++
Date: $Date: 2006-03-19 04:36:55 $
Version: $Revision: 1.4 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef _itkUnaryMedialNodeMetric_txx
#define _itkUnaryMedialNodeMetric_txx
#include "itkUnaryMedialNodeMetric.h"
namespace itk
{
/**
* Constructor.
*/
template <int VDimensions>
UnaryMedialNodeMetric<VDimensions>
::UnaryMedialNodeMetric()
{
// Initialize the metric value to 0.
m_MetricResult = 0;
}
/**
* Function that actually calculates the metric value of the inputs.
* Should be called after the inputs are set using the SetMedialNodes
* function.
*/
template <int VDimensions>
void
UnaryMedialNodeMetric<VDimensions>
::Initialize(void)
{
// Calculate the metric.
// Eigenvalues from image A and image B.
EigenvalueType eigenvalueA;
EigenvalueType eigenvalueB;
eigenvalueA = m_MedialNodeA->GetVotedEigenvalues();
eigenvalueB = m_MedialNodeB->GetVotedEigenvalues();
double difference = 0;
// Iterate through N-1 dimensions and compute the sum of
// the difference in eigenvalue squared. N-1
// eigenvalues are independent.
for(int i = 0; i < VDimensions - 1; ++i)
{
double differenceTemp = (eigenvalueA(i) - eigenvalueB(i));
difference += vcl_pow(differenceTemp,2);
}
// Eigenvalue term for the metric.
double eigenResult = 1-(2*difference);
// Compute the scale term for the metric.
double scaleA = m_MedialNodeA->GetMeanCoreAtomDiameter();
double scaleB = m_MedialNodeB->GetMeanCoreAtomDiameter();
double scaleResult = 1 - vcl_fabs((scaleA - scaleB)/(scaleA + scaleB) );
// The final metric calculation.
m_MetricResult = eigenResult * scaleResult;
}
/**
* Function to set the current medial nodes to be analyzed.
*/
template <int VDimensions>
void
UnaryMedialNodeMetric<VDimensions>
::SetMedialNodes(MedialNodeType * medialNodeA, MedialNodeType * medialNodeB)
{
m_MedialNodeA = medialNodeA;
m_MedialNodeB = medialNodeB;
}
/**
* Print Self
*/
template <int VDimensions>
void
UnaryMedialNodeMetric<VDimensions>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
}
} // end namespace itk
#endif
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