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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.
*
*=========================================================================*/
#include <iostream>
#include "itkChangeInformationImageFilter.h"
#include "itkHalfToFullHermitianImageFilter.h"
#include "itkFullToHalfHermitianImageFilter.h"
#include "itkRandomImageSource.h"
#include "itkRealToHalfHermitianForwardFFTImageFilter.h"
int itkFullToHalfHermitianImageFilterTest(int argc, char *argv[])
{
// Print usage information.
if ( argc < 3 )
{
std::cerr << "Usage: " << argv[0] << " <test image size x> <test image size y>"
<< std::endl;
return EXIT_FAILURE;
}
// Read in image.
typedef itk::Image< float, 2 > ImageType;
typedef itk::Image< std::complex< float >, 2 > ComplexImageType;
typedef itk::RandomImageSource< ImageType > RandomSourceType;
RandomSourceType::Pointer source = RandomSourceType::New();
RandomSourceType::SizeType size;
size[0] = atoi( argv[1] );
size[1] = atoi( argv[2] );
source->SetMin( 0.0f );
source->SetMax( 1.0f );
source->SetSize( size );
source->Update();
// Change the index of the image's largest possible region to test
// generality of the filters.
typedef itk::ChangeInformationImageFilter< ImageType > ChangeFilterType;
ChangeFilterType::Pointer changer = ChangeFilterType::New();
changer->ChangeRegionOn();
ChangeFilterType::OutputImageOffsetValueType indexShift[2];
indexShift[0] = -3;
indexShift[1] = 5;
changer->SetOutputOffset( indexShift );
changer->SetInput( source->GetOutput() );
// Compute frequency image, yielding the non-redundant half of the
// full complex image.
typedef itk::RealToHalfHermitianForwardFFTImageFilter< ImageType, ComplexImageType > FFTFilterType;
FFTFilterType::Pointer fft = FFTFilterType::New();
fft->SetInput( changer->GetOutput() );
// Expand the non-redundant half to the full complex image.
typedef itk::HalfToFullHermitianImageFilter< ComplexImageType > HalfToFullFilterType;
HalfToFullFilterType::Pointer halfToFullFilter = HalfToFullFilterType::New();
halfToFullFilter->SetActualXDimensionIsOddInput( fft->GetActualXDimensionIsOddOutput() );
halfToFullFilter->SetInput( fft->GetOutput() );
typedef itk::FullToHalfHermitianImageFilter< ComplexImageType > FullToHalfFilterType;
FullToHalfFilterType::Pointer fullToHalfFilter = FullToHalfFilterType::New();
fullToHalfFilter->SetInput( halfToFullFilter->GetOutput() );
fullToHalfFilter->Update();
fullToHalfFilter->Print(std::cout);
// Check that the output of the full-to-half filter has the same
// size as the output of the FFT filter.
ComplexImageType::RegionType fftRegion = fft->GetOutput()->GetLargestPossibleRegion();
if ( fullToHalfFilter->GetOutput()->GetLargestPossibleRegion() != fftRegion )
{
std::cerr << "Output size of full-to-half filter is not the same as the output size "
<< "of the FFT filter." << std::endl;
return EXIT_FAILURE;
}
// Check that the output of the full-to-half filter is equal to the
// output of the FFT filter.
typedef itk::ImageRegionConstIterator< ComplexImageType > IteratorType;
IteratorType fftIt( fft->GetOutput(), fftRegion );
IteratorType f2hIt( fullToHalfFilter->GetOutput(), fftRegion );
for (fftIt.GoToBegin(), f2hIt.GoToBegin(); !fftIt.IsAtEnd(); ++fftIt, ++f2hIt)
{
if ( fftIt.Get() != f2hIt.Get() )
{
std::cerr << "Pixel at index " << fftIt.GetIndex() << " does not match!" << std::endl;
std::cerr << "FFT output: " << fftIt.Get() << ", full-to-half output: " << f2hIt.Get()
<< std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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