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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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 itkDeformationVectorFieldTransform_hxx
#define itkDeformationVectorFieldTransform_hxx
#include "itkDeformationVectorFieldTransform.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
#include "itkComposeImageFilter.h"
namespace itk
{
/**
* *********************** Constructor **************************
*/
template <class TScalarType, unsigned int NDimensions>
DeformationVectorFieldTransform<TScalarType, NDimensions>::DeformationVectorFieldTransform()
{
/** Initialize m_Images. */
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
this->m_Images[i] = nullptr;
}
} // end Constructor
/**
* *********************** Destructor ***************************
*/
template <class TScalarType, unsigned int NDimensions>
DeformationVectorFieldTransform<TScalarType, NDimensions>::~DeformationVectorFieldTransform()
{
/** Initialize m_Images. */
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
this->m_Images[i] = nullptr;
}
} // end Destructor
/**
* ******************* SetCoefficientVectorImage **********************
*
* Convert VectorImage (= deformation field) to series of images.
* Set the B-Spline coefficients using a deformation field
* image as input.
*/
template <class TScalarType, unsigned int NDimensions>
void
DeformationVectorFieldTransform<TScalarType, NDimensions>::SetCoefficientVectorImage(
const CoefficientVectorImageType * vecImage)
{
/** Typedef's for iterators. */
using VectorIteratorType = ImageRegionConstIterator<CoefficientVectorImageType>;
using IteratorType = ImageRegionIterator<CoefficientImageType>;
/** Create array of images representing the B-spline
* coefficients in each dimension.
*/
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
this->m_Images[i] = CoefficientImageType::New();
this->m_Images[i]->SetRegions(vecImage->GetLargestPossibleRegion());
this->m_Images[i]->SetOrigin(vecImage->GetOrigin());
this->m_Images[i]->SetSpacing(vecImage->GetSpacing());
this->m_Images[i]->Allocate();
}
/** Setup the iterators. */
VectorIteratorType vecit(vecImage, vecImage->GetLargestPossibleRegion());
vecit.GoToBegin();
IteratorType it[SpaceDimension];
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
it[i] = IteratorType(this->m_Images[i], this->m_Images[i]->GetLargestPossibleRegion());
it[i].GoToBegin();
}
/** Copy one element of a vector to an image. */
CoefficientVectorPixelType vect;
while (!vecit.IsAtEnd())
{
vect = vecit.Get();
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
it[i].Set(static_cast<CoefficientPixelType>(vect[i]));
++it[i];
}
++vecit;
}
/** Put it in the Superclass. */
this->SetCoefficientImages(this->m_Images);
} // end SetCoefficientVectorImage()
/**
* ******************* GetCoefficientVectorImage **********************
*
* Convert series of coefficient images to VectorImage (= deformation field).
*
*/
template <class TScalarType, unsigned int NDimensions>
void
DeformationVectorFieldTransform<TScalarType, NDimensions>::GetCoefficientVectorImage(
CoefficientVectorImagePointer & vecImage) const
{
/** Typedef for the combiner. */
using ScalarImageCombineType = ComposeImageFilter<CoefficientImageType, CoefficientVectorImageType>;
/** Get a handle to the series of coefficient images. */
const CoefficientImagePointer * coefImage = this->GetCoefficientImages();
/** Combine the coefficient images to a vector image. */
auto combiner = ScalarImageCombineType::New();
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
combiner->SetInput(i, coefImage[i]);
}
vecImage = combiner->GetOutput();
vecImage->Update();
} // end GetCoefficientVectorImage()
} // end namespace itk
#endif // end #ifndef itkDeformationVectorFieldTransform_hxx
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