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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 itkRegistrationParameterScalesFromPhysicalShift_hxx
#define itkRegistrationParameterScalesFromPhysicalShift_hxx
#include "itkRegistrationParameterScalesFromPhysicalShift.h"
namespace itk
{
template< typename TMetric >
RegistrationParameterScalesFromPhysicalShift< TMetric >
::RegistrationParameterScalesFromPhysicalShift()
{
}
template< typename TMetric >
void
RegistrationParameterScalesFromPhysicalShift< TMetric >
::ComputeSampleShifts(const ParametersType &deltaParameters, ScalesType &sampleShifts)
{
if (this->GetTransformForward())
{
this->ComputeSampleShiftsInternal<MovingTransformType>(deltaParameters, sampleShifts);
}
else
{
this->ComputeSampleShiftsInternal<FixedTransformType>(deltaParameters, sampleShifts);
}
}
template< typename TMetric >
template< typename TTransform >
void
RegistrationParameterScalesFromPhysicalShift< TMetric >
::ComputeSampleShiftsInternal(const ParametersType &deltaParameters, ScalesType &sampleShifts)
{
typedef typename TTransform::OutputPointType TransformOutputType;
// We save the old parameters and apply the delta parameters to calculate the
// voxel shift. After it is done, we will reset to the old parameters.
TransformBaseTemplate<typename TMetric::MeasureType> *transform = const_cast<TransformBaseTemplate<typename TMetric::MeasureType> *>(this->GetTransform());
const ParametersType oldParameters = transform->GetParameters();
const SizeValueType numSamples = static_cast<const SizeValueType>( this->m_SamplePoints.size() );
VirtualPointType point;
TransformOutputType newMappedVoxel;
// store the old mapped indices to reduce calls to Transform::SetParameters()
std::vector<TransformOutputType> oldMappedVoxels(numSamples);
sampleShifts.SetSize(numSamples);
// compute the indices mapped by the old transform
for (SizeValueType c=0; c<numSamples; c++)
{
point = this->m_SamplePoints[c];
this->template TransformPoint<TransformOutputType>(point, oldMappedVoxels[c]);
}
// Apply the delta parameters to the transform
this->UpdateTransformParameters(deltaParameters);
// compute the indices mapped by the new transform
for (SizeValueType c=0; c<numSamples; c++)
{
point = this->m_SamplePoints[c];
this->template TransformPoint<TransformOutputType>(point, newMappedVoxel);
// find the local shift for each sample point
sampleShifts[c] = newMappedVoxel.EuclideanDistanceTo(oldMappedVoxels[c]);
}
// restore the parameters in the transform
transform->SetParameters(oldParameters);
}
/** Print the information about this class */
template< typename TMetric >
void
RegistrationParameterScalesFromPhysicalShift< TMetric >
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
}
} // namespace itk
#endif
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