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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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"
#include "itkTestingMacros.h"
int
itkFullToHalfHermitianImageFilterTest(int argc, char * argv[])
{
// Print usage information.
if (argc < 3)
{
std::cerr << "Missing Parameters." << std::endl;
std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " testImageSizeX testImageSizeY" << std::endl;
return EXIT_FAILURE;
}
// Read in image.
using ImageType = itk::Image<float, 2>;
using ComplexImageType = itk::Image<std::complex<float>, 2>;
using RandomSourceType = itk::RandomImageSource<ImageType>;
auto source = RandomSourceType::New();
RandomSourceType::SizeType size;
size[0] = std::stoi(argv[1]);
size[1] = std::stoi(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.
using ChangeFilterType = itk::ChangeInformationImageFilter<ImageType>;
auto 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.
using FFTFilterType = itk::RealToHalfHermitianForwardFFTImageFilter<ImageType, ComplexImageType>;
auto fft = FFTFilterType::New();
fft->SetInput(changer->GetOutput());
// Expand the non-redundant half to the full complex image.
using HalfToFullFilterType = itk::HalfToFullHermitianImageFilter<ComplexImageType>;
auto halfToFullFilter = HalfToFullFilterType::New();
halfToFullFilter->SetActualXDimensionIsOddInput(fft->GetActualXDimensionIsOddOutput());
halfToFullFilter->SetInput(fft->GetOutput());
using FullToHalfFilterType = itk::FullToHalfHermitianImageFilter<ComplexImageType>;
auto fullToHalfFilter = FullToHalfFilterType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(fullToHalfFilter, FullToHalfHermitianImageFilter, ImageToImageFilter);
fullToHalfFilter->SetInput(halfToFullFilter->GetOutput());
fullToHalfFilter->Update();
std::cout << "ActualXDimensionIsOdd: " << fullToHalfFilter->GetActualXDimensionIsOdd() << std::endl;
// 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.
using IteratorType = itk::ImageRegionConstIterator<ComplexImageType>;
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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