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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.
*
*=========================================================================*/
#ifndef itkFFTPadImageFilter_hxx
#define itkFFTPadImageFilter_hxx
#include "itkProgressAccumulator.h"
#include "itkNumericTraits.h"
#include "itkPadImageFilter.h"
#include "itkChangeInformationImageFilter.h"
#include "itkForwardFFTImageFilter.h"
#include "itkMath.h"
namespace itk
{
template <class TInputImage, class TOutputImage>
FFTPadImageFilter<TInputImage, TOutputImage>::FFTPadImageFilter()
{
using RealImageType = Image<float, TInputImage::ImageDimension>;
using FFTFilterType = ForwardFFTImageFilter<RealImageType>;
m_SizeGreatestPrimeFactor = FFTFilterType::New()->GetSizeGreatestPrimeFactor();
Self::InternalSetBoundaryCondition(&m_DefaultBoundaryCondition);
}
template <class TInputImage, class TOutputImage>
void
FFTPadImageFilter<TInputImage, TOutputImage>::GenerateOutputInformation()
{
// call the superclass' implementation of this method
Superclass::GenerateOutputInformation();
const InputImageType * input0 = this->GetInput();
OutputImageType * output0 = this->GetOutput();
RegionType region0 = input0->GetLargestPossibleRegion();
SizeType size;
IndexType index;
for (unsigned int i = 0; i < ImageDimension; ++i)
{
SizeValueType padSize = 0;
if (m_SizeGreatestPrimeFactor > 1)
{
while (Math::GreatestPrimeFactor(region0.GetSize()[i] + padSize) > m_SizeGreatestPrimeFactor)
{
++padSize;
}
}
else if (m_SizeGreatestPrimeFactor == 1)
{
// make sure the total size is even
padSize += (region0.GetSize()[i] + padSize) % 2;
}
index[i] = region0.GetIndex()[i] - padSize / 2;
size[i] = region0.GetSize()[i] + padSize;
}
RegionType region(index, size);
output0->SetLargestPossibleRegion(region);
}
template <class TInputImage, class TOutputImage>
void
FFTPadImageFilter<TInputImage, TOutputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "SizeGreatestPrimeFactor: " << m_SizeGreatestPrimeFactor << std::endl;
os << indent << "DefaultBoundaryCondition: ";
m_DefaultBoundaryCondition.Print(os, indent);
}
} // end namespace itk
#endif
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