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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkVnlFFTRealToComplexConjugateImageFilter.txx,v $
Language: C++
Date: $Date: 2006-12-31 14:07:10 $
Version: $Revision: 1.9 $
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 __itkVnlFFTRealToComplexConjugateImageFilter_txx
#define __itkVnlFFTRealToComplexConjugateImageFilter_txx
#include "itkVnlFFTRealToComplexConjugateImageFilter.h"
#include "itkFFTRealToComplexConjugateImageFilter.txx"
#include <iostream>
#include "itkIndent.h"
#include "itkMetaDataObject.h"
#include "itkExceptionObject.h"
#include "vnl/algo/vnl_fft_base.txx"
#include "vnl/algo/vnl_fft_1d.h"
#include "vnl/algo/vnl_fft_2d.h"
#include "vnl_fft_3d.h"
VNL_FFT_BASE_INSTANTIATE(3,double);
VNL_FFT_BASE_INSTANTIATE(3,float);
//#define DEBUG_PRINT(x) /* */
//#define DEBUG_PRINT(x) x
namespace itk
{
//#define DEBUG_PRINT(x) /* */
#define DEBUG_PRINT(x) x
template <class TPixel, unsigned int Dimension>
bool
VnlFFTRealToComplexConjugateImageFilter<TPixel,Dimension>::
Legaldim(int n)
{
int ifac = 2;
for (int l = 1; l <= 3; l++)
{
// Original code
// k = 0;
// L10:
// if (n % ifac != 0) goto L20;
// ++k;
// N /= ifac;
// goto L10;
// L20:
// pqr[l-1] = k;
// ifac += l;
for(; n % ifac == 0;)
{
n /= ifac;
}
ifac += l;
}
return (n == 1); // return false if decomposition failed
}
template <class TPixel, unsigned int Dimension>
void
VnlFFTRealToComplexConjugateImageFilter<TPixel,Dimension>::
GenerateData()
{
unsigned int i;
// get pointers to the input and output
typename Superclass::TInputImageType::ConstPointer inputPtr = this->GetInput();
typename Superclass::TOutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
const typename Superclass::TInputImageType::SizeType& inputSize
= inputPtr->GetLargestPossibleRegion().GetSize();
unsigned int num_dims = inputPtr->GetImageDimension();
if(num_dims != outputPtr->GetImageDimension())
return;
TPixel *in = const_cast<TPixel *>(inputPtr->GetBufferPointer());
outputPtr->SetBufferedRegion( outputPtr->GetRequestedRegion() );
outputPtr->Allocate();
std::complex<TPixel> *out = outputPtr->GetBufferPointer();
unsigned int vec_size = 1;
for(i = 0; i < num_dims; i++)
{
//#if 0
if( !this->Legaldim(inputSize[i]) ) {
ExceptionObject exception(__FILE__, __LINE__);
exception.SetDescription("Illegal Array DIM for FFT");
exception.SetLocation(ITK_LOCATION);
throw exception;
}
//#endif
vec_size *= inputSize[i];
}
vnl_vector< vcl_complex<TPixel> > signal(vec_size);
for(i = 0; i < vec_size; i++)
{
signal[i] = in[i];
}
switch(num_dims)
{
case 1:
{
vnl_fft_1d<TPixel> v1d(vec_size);
v1d.fwd_transform(signal);
}
break;
case 2:
{
vnl_fft_2d<TPixel> v2d(inputSize[0],inputSize[1]);
v2d.vnl_fft_2d<TPixel>::base::transform(signal.data_block(),+1);
}
break;
case 3:
{
vnl_fft_3d<TPixel> v3d(inputSize[0],inputSize[1],inputSize[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];
}
}
template <class TPixel, unsigned int Dimension>
bool
VnlFFTRealToComplexConjugateImageFilter<TPixel,Dimension>::
FullMatrix()
{
return true;
}
}
#endif
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