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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_h
#define itkFFTPadImageFilter_h
#include "itkPadImageFilterBase.h"
#include "itkConceptChecking.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
namespace itk
{
/**
* \class FFTPadImageFilter
* \brief Pad an image to make it suitable for an FFT transformation
*
* FFT filters usually requires a specific image size. The size is decomposed
* in several prime factors, and the filter only supports prime factors up to
* a maximum value.
* This filter automatically finds the greatest prime factor required by the
* available implementation and pads the input appropriately.
*
* This code was adapted from the Insight Journal contribution:
*
* "FFT Based Convolution"
* by Gaetan Lehmann
* https://www.insight-journal.org/browse/publication/717
*
* \author Gaetan Lehmann
*
* \ingroup ITKFFT
*
* \sa FFTShiftImageFilter
*/
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT FFTPadImageFilter : public PadImageFilterBase<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(FFTPadImageFilter);
/** Standard class type aliases. */
using Self = FFTPadImageFilter;
using Superclass = PadImageFilterBase<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Some convenient type alias. */
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
using InputImagePixelType = typename InputImageType::PixelType;
using OutputImagePixelType = typename OutputImageType::PixelType;
using RegionType = typename InputImageType::RegionType;
using IndexType = typename InputImageType::IndexType;
using SizeType = typename InputImageType::SizeType;
/** ImageDimension constants */
static constexpr unsigned int InputImageDimension = TInputImage::ImageDimension;
static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
/** Standard New method. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(FFTPadImageFilter);
/**
* Set/Get the greatest prime factor allowed on the size of the padded image.
*
* The filter increases the dimensional sizes of the image to reach a size with the greatest
* prime factor smaller or equal to the specified value. The default values is
* obtained from the ForwardFFTImageFilter, which is 13 for FFTW,
* and 5 for VNL.
*
* A greatest prime factor of 2 produce a size which is a power of 2, and thus
* is suitable for vnl base fft filters.
* A greatest prime factor of 1 or less - typically 0 - disable the extra padding.
*/
itkGetConstMacro(SizeGreatestPrimeFactor, SizeValueType);
itkSetMacro(SizeGreatestPrimeFactor, SizeValueType);
/** Typedef to describe the boundary condition. */
using BoundaryConditionType = ImageBoundaryCondition<TInputImage, TOutputImage>;
using DefaultBoundaryConditionType = ZeroFluxNeumannBoundaryCondition<TInputImage, TOutputImage>;
protected:
FFTPadImageFilter();
~FFTPadImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
void
GenerateOutputInformation() override;
private:
SizeValueType m_SizeGreatestPrimeFactor{};
DefaultBoundaryConditionType m_DefaultBoundaryCondition{};
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkFFTPadImageFilter.hxx"
#endif
#endif
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