/usr/include/ITK-4.5/itkMeanReciprocalSquareDifferenceImageToImageMetric.hxx is in libinsighttoolkit4-dev 4.5.0-3.
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*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef __itkMeanReciprocalSquareDifferenceImageToImageMetric_hxx
#define __itkMeanReciprocalSquareDifferenceImageToImageMetric_hxx
#include "itkMeanReciprocalSquareDifferenceImageToImageMetric.h"
#include "itkImageRegionConstIteratorWithIndex.h"
namespace itk
{
/**
* Constructor
*/
template< typename TFixedImage, typename TMovingImage >
MeanReciprocalSquareDifferenceImageToImageMetric< TFixedImage, TMovingImage >
::MeanReciprocalSquareDifferenceImageToImageMetric()
{
m_Lambda = 1.0;
m_Delta = 0.00011;
}
/**
* PrintSelf
*/
template< typename TFixedImage, typename 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< typename TFixedImage, typename 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< typename TFixedImage, typename 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< typename TFixedImage, typename 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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