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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 itkFFTWComplexToComplexFFTImageFilter_hxx
#define itkFFTWComplexToComplexFFTImageFilter_hxx
#include "itkFFTWComplexToComplexFFTImageFilter.h"
#include "itkIndent.h"
#include "itkMetaDataObject.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
/*
*
* This code was contributed in the Insight Journal paper:
* "FFT Complex to Complex filters and helper classes"
* by Warfield S.
* https://hdl.handle.net/1926/326
* http://www.insight-journal.org/browse/publication/128
*
*/
namespace itk
{
template< typename TImage >
FFTWComplexToComplexFFTImageFilter< TImage >
::FFTWComplexToComplexFFTImageFilter():
m_PlanRigor( FFTWGlobalConfiguration::GetPlanRigor() )
{
}
template< typename TImage >
void
FFTWComplexToComplexFFTImageFilter< TImage >
::BeforeThreadedGenerateData()
{
// get pointers to the input and output
const InputImageType * input = this->GetInput();
OutputImageType * output = this->GetOutput();
if ( !input || !output )
{
return;
}
// we don't have a nice progress to report, but at least this simple line
// reports the beginning and the end of the process
ProgressReporter progress(this, 0, 1);
// allocate output buffer memory
output->SetBufferedRegion( output->GetRequestedRegion() );
output->Allocate();
const typename OutputImageType::SizeType & inputSize = input->GetLargestPossibleRegion().GetSize();
int transformDirection = 1;
if ( this->GetTransformDirection() == Superclass::INVERSE )
{
transformDirection = -1;
}
typename FFTWProxyType::PlanType plan;
typename FFTWProxyType::ComplexType * in = (typename FFTWProxyType::ComplexType*) input->GetBufferPointer();
typename FFTWProxyType::ComplexType * out = (typename FFTWProxyType::ComplexType*) output->GetBufferPointer();
int flags = m_PlanRigor;
if( !m_CanUseDestructiveAlgorithm )
{
// if the input is about to be destroyed, there is no need to force fftw
// to use an non destructive algorithm. If it is not released however,
// we must be careful to not destroy it.
flags = flags | FFTW_PRESERVE_INPUT;
}
int sizes[ImageDimension];
for(unsigned int i = 0; i < ImageDimension; i++)
{
sizes[(ImageDimension - 1) - i] = inputSize[i];
}
plan = FFTWProxyType::Plan_dft(ImageDimension,sizes,
in,
out,
transformDirection,
flags,
this->GetNumberOfThreads());
FFTWProxyType::Execute(plan);
FFTWProxyType::DestroyPlan(plan);
}
template <typename TImage>
void
FFTWComplexToComplexFFTImageFilter< TImage >
::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread, ThreadIdType itkNotUsed(threadId) )
{
//
// Normalize the output if backward transform
//
if ( this->GetTransformDirection() == Superclass::INVERSE )
{
typedef ImageRegionIterator< OutputImageType > IteratorType;
SizeValueType totalOutputSize = this->GetOutput()->GetRequestedRegion().GetNumberOfPixels();
IteratorType it(this->GetOutput(), outputRegionForThread);
while( !it.IsAtEnd() )
{
PixelType val = it.Value();
val /= totalOutputSize;
it.Set(val);
++it;
}
}
}
template< typename TImage >
void
FFTWComplexToComplexFFTImageFilter< TImage >
::UpdateOutputData(DataObject * output)
{
// we need to catch that information now, because it is changed later
// during the pipeline execution, and thus can't be grabbed in
// GenerateData().
m_CanUseDestructiveAlgorithm = this->GetInput()->GetReleaseDataFlag();
Superclass::UpdateOutputData( output );
}
template< typename TImage >
void
FFTWComplexToComplexFFTImageFilter< TImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "PlanRigor: " << FFTWGlobalConfiguration::GetPlanRigorName(m_PlanRigor) << " (" << m_PlanRigor << ")" << std::endl;
}
} // end namespace itk
#endif // _itkFFTWComplexToComplexFFTImageFilter_hxx
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