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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkVnlFFTComplexConjugateToRealImageFilter.txx,v $
Language: C++
Date: $Date: 2006-12-31 14:07:10 $
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 __itkVnlFFTComplexConjugateToRealImageFilter_txx
#define __itkVnlFFTComplexConjugateToRealImageFilter_txx
#include "itkVnlFFTComplexConjugateToRealImageFilter.h"
#include "itkFFTComplexConjugateToRealImageFilter.txx"
#include <complex>
#include "vnl/algo/vnl_fft_1d.h"
#include "vnl/algo/vnl_fft_2d.h"
#include "vnl_fft_3d.h"
namespace itk
{
template <class TPixel, unsigned int Dimension>
void
VnlFFTComplexConjugateToRealImageFilter<TPixel,Dimension>::
GenerateData()
{
unsigned int i;
// get pointers to the input and output
typename TInputImageType::ConstPointer inputPtr = this->GetInput();
typename TOutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
const typename TInputImageType::SizeType& outputSize
= outputPtr->GetLargestPossibleRegion().GetSize();
unsigned int num_dims = outputPtr->GetImageDimension();
if(num_dims != outputPtr->GetImageDimension())
return;
// allocate output buffer memory
outputPtr->SetBufferedRegion( outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
std::complex<TPixel> *in = const_cast<std::complex<TPixel> *>
(inputPtr->GetBufferPointer());
unsigned int vec_size = 1;
for(i = 0; i < num_dims; i++)
{
vec_size *= outputSize[i];
}
vnl_vector< vcl_complex<TPixel> > signal(vec_size);
for(i = 0; i < vec_size; i++)
signal[i] = in[i];
TPixel *out = outputPtr->GetBufferPointer();
switch(num_dims)
{
case 1:
{
vnl_fft_1d<TPixel> v1d(vec_size);
v1d.bwd_transform(signal);
}
break;
case 2:
{
vnl_fft_2d<TPixel> v2d(outputSize[0],outputSize[1]);
v2d.vnl_fft_2d<TPixel>::base::transform(signal.data_block(),-1);
}
break;
case 3:
{
vnl_fft_3d<TPixel> v3d(outputSize[0],outputSize[1],outputSize[2]);
v3d.vnl_fft_3d<TPixel>::base::transform(signal.data_block(),-1);
}
break;
default:
break;
}
for(i = 0; i < vec_size; i++)
{
out[i] = signal[i].real() / vec_size;
}
}
template <class TPixel, unsigned int Dimension>
bool
VnlFFTComplexConjugateToRealImageFilter<TPixel,Dimension>::
FullMatrix()
{
return true;
}
}
#endif
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