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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.
*
*=========================================================================*/
#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://hdl.handle.net/10380/3154
*
* \author Gaetan Lehmann
*
* \ingroup ITKFFT
*
* \sa FFTShiftImageFilter
*/
template<typename TInputImage, typename TOutputImage=TInputImage>
class ITK_TEMPLATE_EXPORT FFTPadImageFilter :
public PadImageFilterBase<TInputImage, TOutputImage>
{
public:
/** Standard class typedefs. */
typedef FFTPadImageFilter Self;
typedef PadImageFilterBase<TInputImage, TOutputImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Some convenient typedefs. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename InputImageType::PixelType InputImagePixelType;
typedef typename OutputImageType::PixelType OutputImagePixelType;
typedef typename InputImageType::RegionType RegionType;
typedef typename InputImageType::IndexType IndexType;
typedef typename InputImageType::SizeType SizeType;
/** ImageDimension constants */
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension);
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** Standard New method. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(FFTPadImageFilter, PadImageFilterBase);
/**
* Set/Get the greatest prime factor allowed on the size of the padded image.
* The filter increase the size of the image to reach a size with the greatest
* prime factor smaller or equal to the specified value. The default value is
* 13, which is the greatest prime number for which the FFT are precomputed
* in FFTW, and thus gives very good performance.
* 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. */
typedef ImageBoundaryCondition< TInputImage > BoundaryConditionType;
typedef BoundaryConditionType * BoundaryConditionPointerType;
typedef ZeroFluxNeumannBoundaryCondition< TInputImage > DefaultBoundaryConditionType;
protected:
FFTPadImageFilter();
~FFTPadImageFilter() ITK_OVERRIDE {};
virtual void PrintSelf(std::ostream& os, Indent indent) const ITK_OVERRIDE;
virtual void GenerateOutputInformation() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(FFTPadImageFilter);
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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