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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 "itkImageRegionConstIteratorWithIndex.h"
namespace itk
{
template <typename TFixedImage, typename TMovingImage>
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage,
TMovingImage>::MeanReciprocalSquareDifferenceImageToImageMetric()
{
m_Lambda = 1.0;
m_Delta = 0.00011;
}
template <typename TFixedImage, typename TMovingImage>
void
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage, TMovingImage>::PrintSelf(std::ostream & os,
Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Lambda: " << m_Lambda << std::endl;
os << indent << "Delta: " << m_Delta << std::endl;
}
template <typename TFixedImage, typename TMovingImage>
auto
MeanReciprocalSquareDifferenceImageToImageMetric<TFixedImage, TMovingImage>::GetValue(
const TransformParametersType & parameters) const -> MeasureType
{
FixedImageConstPointer fixedImage = this->m_FixedImage;
if (!fixedImage)
{
itkExceptionMacro("Fixed image has not been assigned");
}
double MovingValue;
double FixedValue;
using FixedIteratorType = itk::ImageRegionConstIteratorWithIndex<FixedImageType>;
FixedIteratorType ti(fixedImage, this->GetFixedImageRegion());
typename FixedImageType::IndexType index;
MeasureType measure{};
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->IsInsideInWorldSpace(inputPoint))
{
++ti;
continue;
}
TransformType const * transform = this->m_Transform;
OutputPointType transformedPoint = transform->TransformPoint(inputPoint);
if (this->m_MovingImageMask && !this->m_MovingImageMask->IsInsideInWorldSpace(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;
}
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];
}
}
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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