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itkBlockMatchingParabolicInterpolationDisplacementCalculator.hxx
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itkBlockMatchingParabolicInterpolationDisplacementCalculator.hxx
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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 itkBlockMatchingParabolicInterpolationDisplacementCalculator_hxx
#define itkBlockMatchingParabolicInterpolationDisplacementCalculator_hxx
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkImageRegionConstIterator.h"
namespace itk
{
namespace BlockMatching
{
template <typename TMetricImage, typename TDisplacementImage, typename TCoordRep>
ParabolicInterpolationDisplacementCalculator<TMetricImage, TDisplacementImage, TCoordRep>::
ParabolicInterpolationDisplacementCalculator()
{
this->m_CacheMetricImage = true;
}
template <typename TMetricImage, typename TDisplacementImage, typename TCoordRep>
void
ParabolicInterpolationDisplacementCalculator<TMetricImage, TDisplacementImage, TCoordRep>::
ThreadedParabolicInterpolation(const RegionType & region)
{
// Find index of the maximum value.
PixelType max = NumericTraits<PixelType>::min();
IndexType maxIndex;
maxIndex.Fill(0);
TCoordRep y1 = max;
TCoordRep y0;
TCoordRep y2;
PointType maxPoint;
SpacingType spacing;
IndexType tempIndex = maxIndex;
RegionType metricImageRegion;
MetricImageImageIteratorType imageImageIt(this->m_MetricImageImage, region);
ImageRegionConstIterator<CenterPointsImageType> centerPointsIt(this->m_CenterPointsImage, region);
ImageRegionIterator<DisplacementImageType> displacementIt(this->m_DisplacementImage, region);
MetricImagePointerType metricImage;
for (imageImageIt.GoToBegin(), centerPointsIt.GoToBegin(), displacementIt.GoToBegin(); !imageImageIt.IsAtEnd();
++imageImageIt, ++centerPointsIt, ++displacementIt)
{
metricImage = imageImageIt.Get();
spacing = metricImage->GetSpacing();
// Find the max sampled location.
max = NumericTraits<PixelType>::min();
maxIndex.Fill(0);
metricImageRegion = metricImage->GetBufferedRegion();
ImageRegionConstIteratorWithIndex<MetricImageType> it(metricImage, metricImageRegion);
for (it.GoToBegin(); !it.IsAtEnd(); ++it)
{
if (it.Get() > max)
{
max = it.Get();
maxIndex = it.GetIndex();
}
}
y1 = max;
metricImage->TransformIndexToPhysicalPoint(maxIndex, maxPoint);
tempIndex = maxIndex;
for (unsigned int i = 0; i < ImageDimension; i++)
{
tempIndex[i] = maxIndex[i] - 1;
if (!metricImageRegion.IsInside(tempIndex))
{
tempIndex[i] = maxIndex[i];
continue;
}
y0 = metricImage->GetPixel(tempIndex);
tempIndex[i] = maxIndex[i] + 1;
if (!metricImageRegion.IsInside(tempIndex))
{
tempIndex[i] = maxIndex[i];
continue;
}
y2 = metricImage->GetPixel(tempIndex);
tempIndex[i] = maxIndex[i];
// delta = spacing * ( y0 - y2 ) / 2* ( y 0 - 2 y1 + y2 )
maxPoint[i] += spacing[i] * (y0 - y2) / (2 * (y0 - 2 * y1 + y2));
}
displacementIt.Set(maxPoint - centerPointsIt.Get());
}
}
template <typename TMetricImage, typename TDisplacementImage, typename TCoordRep>
void
ParabolicInterpolationDisplacementCalculator<TMetricImage, TDisplacementImage, TCoordRep>::Compute()
{
this->m_MultiThreader->template ParallelizeImageRegion<ImageDimension>(
this->m_DisplacementImage->GetRequestedRegion(),
[this](const RegionType & outputRegion) { this->ThreadedParabolicInterpolation(outputRegion); },
nullptr);
this->m_DisplacementImage->Modified();
}
} // end namespace BlockMatching
} // end namespace itk
#endif