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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkFFTComplexConjugateToRealImageFilter.txx,v $
Language: C++
Date: $Date: 2007-02-14 17:51:19 $
Version: $Revision: 1.10 $
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 __itkFFTComplexConjugateToRealImageFilter_txx
#define __itkFFTComplexConjugateToRealImageFilter_txx
#include "itkFFTComplexConjugateToRealImageFilter.h"
#include "itkMetaDataDictionary.h"
#include "itkMetaDataObject.h"
#include "itkVnlFFTComplexConjugateToRealImageFilter.h"
#if defined(USE_FFTWD) || defined(USE_FFTWF)
#include "itkFFTWComplexConjugateToRealImageFilter.h"
#endif
namespace itk
{
template < class TPixel , unsigned int Dimension >
typename FFTComplexConjugateToRealImageFilter < TPixel , Dimension >::Pointer
FFTComplexConjugateToRealImageFilter < TPixel , Dimension >
::New(void)
{
Pointer smartPtr = ::itk::ObjectFactory<Self>::Create();
#ifdef USE_FFTWD
if(smartPtr.IsNull())
{
if (typeid(TPixel) == typeid(double))
{
smartPtr = dynamic_cast<Self *>(
FFTWComplexConjugateToRealImageFilter< double, Dimension >
::New().GetPointer() );
}
}
#endif
#ifdef USE_FFTWF
if(smartPtr.IsNull())
{
if (typeid(TPixel) == typeid(float))
{
smartPtr = dynamic_cast<Self *>(
FFTWComplexConjugateToRealImageFilter< float, Dimension >
::New().GetPointer());
}
}
#endif
if(smartPtr.IsNull())
{
smartPtr = VnlFFTComplexConjugateToRealImageFilter< TPixel, Dimension >
::New().GetPointer();
}
return smartPtr;
}
template <class TPixel, unsigned int Dimension>
void
FFTComplexConjugateToRealImageFilter<TPixel,Dimension>::
GenerateOutputInformation()
{
// call the superclass' implementation of this method
Superclass::GenerateOutputInformation();
//
// If this implementation returns a full result
// instead of a 'half-complex' matrix, then none of this
// is necessary
if(this->FullMatrix())
return;
// get pointers to the input and output
typename TInputImageType::ConstPointer inputPtr = this->GetInput();
typename TOutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
//
// This is all based on the same function in itk::ShrinkImageFilter
// ShrinkImageFilter also modifies the image spacing, but spacing
// has no meaning in the result of an FFT. For an IFFT, since the
// spacing is propagated to the complex result, we can use the spacing
// from the input to propagate back to the output.
unsigned int i;
const typename TInputImageType::SizeType& inputSize
= inputPtr->GetLargestPossibleRegion().GetSize();
const typename TInputImageType::IndexType& inputStartIndex
= inputPtr->GetLargestPossibleRegion().GetIndex();
typename TOutputImageType::SizeType outputSize;
typename TOutputImageType::IndexType outputStartIndex;
//
// in 4.3.4 of the FFT documentation, they indicate the size of
// of a real-to-complex FFT is N * N ... + (N /2+1)
// 1 2 d
// complex numbers.
// going from complex to real, you know the output is at least
// twice the size in the last dimension as the input, but it might
// be 2*size+1. Consequently, the output of the FFT:R2C operation
//
MetaDataDictionary &InputDic =
const_cast<MetaDataDictionary &>(inputPtr->GetMetaDataDictionary());
typedef typename TInputImageType::SizeType::SizeValueType SizeScalarType;
SizeScalarType x = 0;
outputSize[0] = (inputSize[0] - 1) * 2;
if(this->ActualXDimensionIsOdd())
{
outputSize[0]++;
}
// backwards compatible/deprecated version
if(ExposeMetaData < SizeScalarType >
(InputDic,std::string("FFT_Actual_RealImage_Size"),x))
{
outputSize[0] = x;
}
outputStartIndex[0] = inputStartIndex[0];
for (i = 1; i < TOutputImageType::ImageDimension; i++)
{
outputSize[i] = inputSize[i];
outputStartIndex[i] = inputStartIndex[i];
}
typename TOutputImageType::RegionType outputLargestPossibleRegion;
outputLargestPossibleRegion.SetSize( outputSize );
outputLargestPossibleRegion.SetIndex( outputStartIndex );
outputPtr->SetLargestPossibleRegion( outputLargestPossibleRegion );
}
template <class TPixel, unsigned int Dimension>
void
FFTComplexConjugateToRealImageFilter<TPixel,Dimension>::
GenerateInputRequestedRegion()
{
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
typename TInputImageType::Pointer inputPtr =
const_cast<TInputImageType *>(this->GetInput());
if( inputPtr )
{
inputPtr->SetRequestedRegionToLargestPossibleRegion();
}
}
}
#endif
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