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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 itkComposeDisplacementFieldsImageFilter_hxx
#define itkComposeDisplacementFieldsImageFilter_hxx
#include "itkImageRegionConstIteratorWithIndex.h"
#include "itkImageRegionIterator.h"
#include "itkVectorLinearInterpolateImageFunction.h"
namespace itk
{
/*
* ComposeDisplacementFieldsImageFilter class definitions
*/
template <typename InputImage, typename TOutputImage>
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>::ComposeDisplacementFieldsImageFilter()
{
this->SetNumberOfRequiredInputs(2);
this->DynamicMultiThreadingOn();
using DefaultInterpolatorType = VectorLinearInterpolateImageFunction<InputFieldType, RealType>;
auto interpolator = DefaultInterpolatorType::New();
this->m_Interpolator = interpolator;
}
template <typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>::SetInterpolator(InterpolatorType * interpolator)
{
itkDebugMacro("setting Interpolator to " << interpolator);
if (this->m_Interpolator != interpolator)
{
this->m_Interpolator = interpolator;
this->Modified();
if (this->GetDisplacementField())
{
this->m_Interpolator->SetInputImage(this->GetInput(0));
}
}
}
template <typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>::BeforeThreadedGenerateData()
{
constexpr VectorType zeroVector{};
this->GetOutput()->FillBuffer(zeroVector);
if (!this->m_Interpolator->GetInputImage())
{
itkExceptionMacro("Displacement field not set in interpolator.");
}
}
template <typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>::DynamicThreadedGenerateData(const RegionType & region)
{
typename OutputFieldType::Pointer output = this->GetOutput();
typename InputFieldType::ConstPointer warpingField = this->GetWarpingField();
ImageRegionConstIteratorWithIndex<InputFieldType> ItW(warpingField, region);
ImageRegionIterator<OutputFieldType> ItF(output, region);
PointType pointIn1;
PointType pointIn2;
PointType pointIn3;
typename OutputFieldType::PixelType outDisplacement;
for (ItW.GoToBegin(), ItF.GoToBegin(); !ItW.IsAtEnd(); ++ItW, ++ItF)
{
warpingField->TransformIndexToPhysicalPoint(ItW.GetIndex(), pointIn1);
VectorType warpVector = ItW.Get();
for (unsigned int d = 0; d < ImageDimension; ++d)
{
pointIn2[d] = pointIn1[d] + warpVector[d];
}
typename InterpolatorType::OutputType displacement{};
if (this->m_Interpolator->IsInsideBuffer(pointIn2))
{
displacement = this->m_Interpolator->Evaluate(pointIn2);
}
for (unsigned int d = 0; d < ImageDimension; ++d)
{
pointIn3[d] = pointIn2[d] + displacement[d];
}
outDisplacement = pointIn3 - pointIn1;
ItF.Set(outDisplacement);
}
}
template <typename InputImage, typename TOutputImage>
void
ComposeDisplacementFieldsImageFilter<InputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
itkPrintSelfObjectMacro(Interpolator);
}
} // end namespace itk
#endif
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