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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 itkMultiResolutionShrinkPyramidImageFilter_hxx
#define itkMultiResolutionShrinkPyramidImageFilter_hxx
#include "itkMultiResolutionShrinkPyramidImageFilter.h"
#include "itkShrinkImageFilter.h"
#include <vnl/vnl_math.h>
namespace itk
{
/*
* GenerateData
*/
template <class TInputImage, class TOutputImage>
void
MultiResolutionShrinkPyramidImageFilter<TInputImage, TOutputImage>::GenerateData()
{
/** Create the shrinking filter. */
using ShrinkerType = ShrinkImageFilter<TInputImage, TOutputImage>;
auto shrinker = ShrinkerType::New();
shrinker->SetInput(this->GetInput());
/** Loop over all resolution levels. */
unsigned int factors[ImageDimension];
for (unsigned int ilevel = 0; ilevel < this->m_NumberOfLevels; ++ilevel)
{
this->UpdateProgress(static_cast<float>(ilevel) / static_cast<float>(this->m_NumberOfLevels));
// Allocate memory for each output
OutputImagePointer outputPtr = this->GetOutput(ilevel);
outputPtr->SetBufferedRegion(outputPtr->GetRequestedRegion());
outputPtr->Allocate();
// compute and set shrink factors
for (unsigned int idim = 0; idim < ImageDimension; ++idim)
{
factors[idim] = this->m_Schedule[ilevel][idim];
}
shrinker->SetShrinkFactors(factors);
shrinker->GraftOutput(outputPtr);
// force to always update in case shrink factors are the same
shrinker->Modified();
shrinker->UpdateLargestPossibleRegion();
this->GraftNthOutput(ilevel, shrinker->GetOutput());
}
} // end GenerateData()
/**
* GenerateInputRequestedRegion
*/
template <class TInputImage, class TOutputImage>
void
MultiResolutionShrinkPyramidImageFilter<TInputImage, TOutputImage>::GenerateInputRequestedRegion()
{
// call the superclass' implementation of this method
Superclass::Superclass::GenerateInputRequestedRegion();
}
} // namespace itk
#endif
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