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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkFFTWComplexConjugateToRealImageFilter.txx,v $
Language: C++
Date: $Date: 2006-12-31 14:07:10 $
Version: $Revision: 1.13 $
Copyright (c) 2002 Insight Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkFFTWComplexConjugateToRealImageFilter_txx
#define __itkFFTWComplexConjugateToRealImageFilter_txx
#include "itkFFTWComplexConjugateToRealImageFilter.h"
#include "itkFFTComplexConjugateToRealImageFilter.txx"
#include <iostream>
#include "itkIndent.h"
#include "itkMetaDataObject.h"
#include "itkImageRegionIterator.h"
namespace itk
{
template <typename TPixel, unsigned int Dimension>
void
FFTWComplexConjugateToRealImageFilter<TPixel,Dimension>::
GenerateData()
{
// get pointers to the input and output
typename TInputImageType::ConstPointer inputPtr = this->GetInput();
typename TOutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
// allocate output buffer memory
outputPtr->SetBufferedRegion( outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
const typename TInputImageType::SizeType& outputSize
= outputPtr->GetLargestPossibleRegion().GetSize();
const typename TOutputImageType::SizeType& inputSize
= inputPtr->GetLargestPossibleRegion().GetSize();
// figure out sizes
// size of input and output aren't the same which is handled in the superclass,
// sort of.
// the input size and output size only differ in the fastest moving dimension
unsigned int total_outputSize = 1;
unsigned int total_inputSize = 1;
for(unsigned i = 0; i < Dimension; i++)
{
total_outputSize *= outputSize[i];
total_inputSize *= inputSize[i];
}
if(this->m_PlanComputed) // if we've already computed a plan
{
// if the image sizes aren't the same,
// we have to compute the plan again
if(this->m_LastImageSize != total_outputSize)
{
delete [] this->m_InputBuffer;
delete [] this->m_OutputBuffer;
FFTWProxyType::DestroyPlan(this->m_Plan);
this->m_PlanComputed = false;
}
}
// either plan never computed, or need to re-compute
if(!this->m_PlanComputed)
{
// if we've never computed the plan, or we need to redo it
this->m_InputBuffer = new typename FFTWProxyType::ComplexType[total_inputSize];
this->m_OutputBuffer = new TPixel[total_outputSize];
this->m_LastImageSize = total_outputSize;
switch(Dimension)
{
case 1:
this->m_Plan = FFTWProxyType::Plan_dft_c2r_1d(outputSize[0],
this->m_InputBuffer,this->m_OutputBuffer,
FFTW_ESTIMATE);
break;
case 2:
this->m_Plan = FFTWProxyType::Plan_dft_c2r_2d(outputSize[1],outputSize[0],
this->m_InputBuffer,this->m_OutputBuffer,
FFTW_ESTIMATE);
break;
case 3:
this->m_Plan = FFTWProxyType::Plan_dft_c2r_3d(outputSize[2],outputSize[1],outputSize[0],
this->m_InputBuffer,this->m_OutputBuffer,
FFTW_ESTIMATE);
break;
default:
int *sizes = new int[Dimension];
for(unsigned int i = 0; i < Dimension; i++)
{
sizes[(Dimension - 1) - i] = outputSize[i];
}
this->m_Plan = FFTWProxyType::Plan_dft_c2r(Dimension,sizes,
this->m_InputBuffer,
this->m_OutputBuffer,FFTW_ESTIMATE);
delete [] sizes;
}
this->m_PlanComputed = true;
}
// copy the input, because it may be destroyed by computing the plan
memcpy(this->m_InputBuffer,
inputPtr->GetBufferPointer(),
total_inputSize * sizeof(typename FFTWProxyType::ComplexType));
fftw::Proxy<TPixel>::Execute(this->m_Plan);
// copy the output
memcpy(outputPtr->GetBufferPointer(),
this->m_OutputBuffer,
total_outputSize * sizeof(TPixel));
typedef ImageRegionIterator< TOutputImageType > IteratorType;
IteratorType it(outputPtr,outputPtr->GetLargestPossibleRegion());
while( !it.IsAtEnd() )
{
it.Set( it.Value() / total_outputSize );
++it;
}
}
template <typename TPixel,unsigned int Dimension>
bool
FFTWComplexConjugateToRealImageFilter<TPixel,Dimension>::
FullMatrix()
{
return false;
}
}// namespace itk
#endif // _itkFFTWComplexConjugateToRealImageFilter_txx
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