/usr/include/InsightToolkit/Algorithms/itkMeanReciprocalSquareDifferenceImageToImageMetric.txx is in libinsighttoolkit3-dev 3.20.1-1.
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Program: Insight Segmentation & Registration Toolkit
Module: itkMeanReciprocalSquareDifferenceImageToImageMetric.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkMeanReciprocalSquareDifferenceImageToImageMetric_txx
#define __itkMeanReciprocalSquareDifferenceImageToImageMetric_txx
#include "itkMeanReciprocalSquareDifferenceImageToImageMetric.h"
#include "itkImageRegionConstIteratorWithIndex.h"
namespace itk
{
/**
* Constructor
*/
template <class TFixedImage, class TMovingImage>
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>
::MeanReciprocalSquareDifferenceImageToImageMetric()
{
m_Lambda = 1.0;
m_Delta = 0.00011;
}
/**
* PrintSelf
*/
template <class TFixedImage, class TMovingImage>
void
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf( os, indent );
os << "Lambda factor = " << m_Lambda << std::endl;
os << "Delta value = " << m_Delta << std::endl;
}
/*
* Get the match Measure
*/
template <class TFixedImage, class TMovingImage>
typename MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>::MeasureType
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>
::GetValue( const TransformParametersType & parameters ) const
{
FixedImageConstPointer fixedImage = this->m_FixedImage;
if( !fixedImage )
{
itkExceptionMacro( << "Fixed image has not been assigned" );
}
const unsigned int dimension = FixedImageType::ImageDimension;
itk::Point<double, dimension> Point;
double MovingValue;
double FixedValue;
typedef itk::ImageRegionConstIteratorWithIndex<FixedImageType> FixedIteratorType;
FixedIteratorType ti( fixedImage, this->GetFixedImageRegion() );
typename FixedImageType::IndexType index;
MeasureType measure = NumericTraits< MeasureType >::Zero;
this->m_NumberOfPixelsCounted = 0;
this->SetTransformParameters( parameters );
while(!ti.IsAtEnd())
{
index = ti.GetIndex();
InputPointType inputPoint;
fixedImage->TransformIndexToPhysicalPoint( index, inputPoint );
if( this->m_FixedImageMask && !this->m_FixedImageMask->IsInside( inputPoint ) )
{
++ti;
continue;
}
TransformType const *transform = this->m_Transform;
OutputPointType transformedPoint = transform->TransformPoint( inputPoint );
if( this->m_MovingImageMask && !this->m_MovingImageMask->IsInside( transformedPoint ) )
{
++ti;
continue;
}
if( this->m_Interpolator->IsInsideBuffer( transformedPoint ) )
{
MovingValue = this->m_Interpolator->Evaluate( transformedPoint );
FixedValue = ti.Get();
this->m_NumberOfPixelsCounted++;
const double diff = MovingValue - FixedValue;
measure += 1.0f / ( 1.0f + m_Lambda* ( diff * diff ) );
}
++ti;
}
return measure;
}
/**
* Get the Derivative Measure
*/
template < class TFixedImage, class TMovingImage>
void
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>
::GetDerivative( const TransformParametersType & parameters,
DerivativeType & derivative ) const
{
TransformParametersType testPoint;
testPoint = parameters;
const unsigned int numberOfParameters = this->GetNumberOfParameters();
derivative = DerivativeType( numberOfParameters );
for( unsigned int i=0; i<numberOfParameters; i++)
{
testPoint[i] -= m_Delta;
const MeasureType valuep0 = this->GetValue( testPoint );
testPoint[i] += 2 * m_Delta;
const MeasureType valuep1 = this->GetValue( testPoint );
derivative[i] = (valuep1 - valuep0 ) / ( 2 * m_Delta );
testPoint[i] = parameters[i];
}
}
/**
* Get both the match Measure and theDerivative Measure
*/
template <class TFixedImage, class TMovingImage>
void
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,TMovingImage>
::GetValueAndDerivative(const TransformParametersType & parameters,
MeasureType & Value, DerivativeType & Derivative) const
{
Value = this->GetValue( parameters );
this->GetDerivative( parameters, Derivative );
}
} // end namespace itk
#endif
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