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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 "itkRandomImageSource.h"
#include "itkRealToHalfHermitianForwardFFTImageFilter.h"
#include "itkTestingMacros.h"
int
itkHalfToFullHermitianImageFilterTest(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 FFTFilter = itk::RealToHalfHermitianForwardFFTImageFilter<ImageType, ComplexImageType>;
auto fft = FFTFilter::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->SetActualXDimensionIsOdd(fft->GetActualXDimensionIsOddOutput());
halfToFullFilter->SetInput(fft->GetOutput());
halfToFullFilter->Update();
halfToFullFilter->Print(std::cout);
ComplexImageType::SizeType fftSize = fft->GetOutput()->GetLargestPossibleRegion().GetSize();
// Test that the output is the expected size.
ComplexImageType::RegionType halfToFullOutputRegion = halfToFullFilter->GetOutput()->GetLargestPossibleRegion();
ComplexImageType::SizeType halfToFullOutputSize = halfToFullOutputRegion.GetSize();
if (halfToFullOutputSize != size)
{
std::cerr << "HalfToFullHermitianImageFilter did not produce an image of the expected size. " << std::endl;
std::cerr << "Expected size " << size << ", output size is " << halfToFullOutputSize << std::endl;
return EXIT_FAILURE;
}
// Test that the full image has the Hermitian property.
ComplexImageType::IndexType conjugateRegionIndex;
conjugateRegionIndex.Fill(0);
conjugateRegionIndex[0] = static_cast<ComplexImageType::IndexValueType>(fftSize[0]) + indexShift[0];
conjugateRegionIndex[1] = indexShift[1];
ComplexImageType::SizeType conjugateRegionSize(size);
conjugateRegionSize[0] -= fftSize[0];
itk::ImageRegion<ComplexImageType::ImageDimension> conjugateRegion(conjugateRegionIndex, conjugateRegionSize);
using ComplexIteratorType = itk::ImageRegionConstIteratorWithIndex<ComplexImageType>;
ComplexIteratorType it(halfToFullFilter->GetOutput(), conjugateRegion);
for (it.GoToBegin(); !it.IsAtEnd(); ++it)
{
ComplexImageType::IndexType conjugateIndex = it.GetIndex();
// Flip the indices about the center of the image.
ComplexImageType::IndexType index(conjugateIndex);
for (unsigned int i = 0; i < ComplexImageType::ImageDimension; ++i)
{
if (conjugateIndex[i] != indexShift[i])
{
index[i] = size[i] - conjugateIndex[i] + 2 * indexShift[i];
}
}
if (it.Get() != std::conj(halfToFullFilter->GetOutput()->GetPixel(index)))
{
std::cerr << std::endl
<< "Mismatch found in conjugate index " << conjugateIndex << " (original index " << index
<< "). Expected " << std::conj(halfToFullFilter->GetOutput()->GetPixel(index)) << ", got " << it.Get()
<< '.' << std::endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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