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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkVnlComplexToComplexFFTImageFilter_hxx
#define itkVnlComplexToComplexFFTImageFilter_hxx
#include "itkVnlComplexToComplexFFTImageFilter.h"
#include "itkProgressReporter.h"
#include "itkVnlFFTCommon.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkImageAlgorithm.h"
namespace itk
{
template< typename TImage >
VnlComplexToComplexFFTImageFilter< TImage >
::VnlComplexToComplexFFTImageFilter()
{
}
template <typename TImage>
void
VnlComplexToComplexFFTImageFilter< TImage >
::BeforeThreadedGenerateData()
{
const ImageType * input = this->GetInput();
ImageType * output = this->GetOutput();
const typename ImageType::RegionType bufferedRegion = input->GetBufferedRegion();
const typename ImageType::SizeType & imageSize = bufferedRegion.GetSize();
for( unsigned int ii = 0; ii < ImageDimension; ++ii )
{
if ( !VnlFFTCommon::IsDimensionSizeLegal( imageSize[ii] ) )
{
itkExceptionMacro(<< "Cannot compute FFT of image with size "
<< imageSize << ". VnlComplexToComplexFFTImageFilter operates "
<< "only on images whose size in each dimension is a multiple of "
<< "2, 3, or 5." );
}
}
// Copy the input to the output, and we will work in place on the output.
ImageAlgorithm::Copy< ImageType, ImageType >( input, output, bufferedRegion, bufferedRegion );
typedef std::complex< typename PixelType::value_type > VclPixelType;
VclPixelType * outputBuffer = static_cast< VclPixelType * >( output->GetBufferPointer() );
// call the proper transform, based on compile type template parameter
VnlFFTCommon::VnlFFTTransform< Image< typename PixelType::value_type , ImageDimension > > vnlfft( imageSize );
if ( this->GetTransformDirection() == Superclass::INVERSE )
{
vnlfft.transform( outputBuffer, 1 );
}
else
{
vnlfft.transform( outputBuffer, -1 );
}
}
template <typename TImage>
void
VnlComplexToComplexFFTImageFilter< TImage >
::ThreadedGenerateData(const OutputImageRegionType& outputRegionForThread, ThreadIdType itkNotUsed(threadId) )
{
//
// Normalize the output if backward transform
//
if ( this->GetTransformDirection() == Superclass::INVERSE )
{
typedef ImageRegionIterator< OutputImageType > IteratorType;
SizeValueType totalOutputSize = this->GetOutput()->GetRequestedRegion().GetNumberOfPixels();
IteratorType it(this->GetOutput(), outputRegionForThread);
while( !it.IsAtEnd() )
{
PixelType val = it.Value();
val /= totalOutputSize;
it.Set(val);
++it;
}
}
}
} // end namespace itk
#endif // _itkVnlComplexToComplexFFTImageFilter_hxx
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