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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkFFTComplexToComplexImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software 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.
=========================================================================*/
/**
*
* Attribution Notice. This research work was made possible by
* Grant Number R01 RR021885 (PI Simon K. Warfield, Ph.D.) from
* the National Center for Research Resources (NCRR), a component of the
* National Institutes of Health (NIH). Its contents are solely the
* responsibility of the authors and do not necessarily represent the
* official view of NCRR or NIH.
*
* This class was taken from the Insight Journal paper:
* http://insight-journal.org/midas/handle.php?handle=1926/326
*
*/
#ifndef __itkFFTComplexToComplexImageFilter_txx
#define __itkFFTComplexToComplexImageFilter_txx
#include "itkFFTComplexToComplexImageFilter.h"
#include "itkFFTWComplexToComplexImageFilter.h"
namespace itk
{
#if defined(USE_FFTWD) || defined(USE_FFTWF)
template <class TPixel,unsigned int NDimension> class FFTWComplexToComplexImageFilter;
#endif
template < class TPixel, unsigned int NDimension >
typename FFTComplexToComplexImageFilter< TPixel, NDimension >::Pointer
FFTComplexToComplexImageFilter< TPixel,NDimension >
::New(void)
{
Pointer smartPtr = ::itk::ObjectFactory<Self>::Create();
#ifdef USE_FFTWD
if( smartPtr.IsNull() )
{
if( typeid(TPixel) == typeid(double) )
{
smartPtr = dynamic_cast<Self *>(
FFTWComplexToComplexImageFilter< double, NDimension >::New().GetPointer() );
}
}
#endif
#ifdef USE_FFTWF
if(smartPtr.IsNull())
{
if( typeid(TPixel) == typeid(float) )
{
smartPtr = dynamic_cast<Self *>(
FFTWComplexToComplexImageFilter< float, NDimension >::New().GetPointer() );
}
}
#endif
return smartPtr;
}
template <class TPixel, unsigned int NDimension >
void
FFTComplexToComplexImageFilter<TPixel,NDimension >::
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 InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::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 InputImageType::SizeType& inputSize
= inputPtr->GetLargestPossibleRegion().GetSize();
const typename InputImageType::IndexType& inputStartIndex
= inputPtr->GetLargestPossibleRegion().GetIndex();
typename OutputImageType::SizeType outputSize;
typename OutputImageType::IndexType outputStartIndex;
//
// Size of output FFT:C2C is the same as input
//
outputSize[0] = inputSize[0];
outputStartIndex[0] = inputStartIndex[0];
for (i = 1; i < OutputImageType::ImageDimension; i++)
{
outputSize[i] = inputSize[i];
outputStartIndex[i] = inputStartIndex[i];
}
typename OutputImageType::RegionType outputLargestPossibleRegion;
outputLargestPossibleRegion.SetSize( outputSize );
outputLargestPossibleRegion.SetIndex( outputStartIndex );
outputPtr->SetLargestPossibleRegion( outputLargestPossibleRegion );
}
template <class TPixel, unsigned int NDimension >
void
FFTComplexToComplexImageFilter<TPixel,NDimension>::
GenerateInputRequestedRegion()
{
Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
typename InputImageType::Pointer inputPtr =
const_cast<InputImageType *>(this->GetInput());
inputPtr->SetRequestedRegionToLargestPossibleRegion();
}
}
#endif
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