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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 itkInverseFFTImageFilter_h
#define itkInverseFFTImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkMacro.h"
namespace itk
{
/**
* \class InverseFFTImageFilter
*
* \brief Base class for inverse Fast Fourier Transform.
*
* This is a base class for the "inverse" or "reverse" Discrete Fourier
* Transform. This is an abstract base class: the actual implementation is
* provided by the best child available on the system when the object is
* created via the object factory system.
*
* This class transforms a full complex image with Hermitian symmetry into
* its real spatial domain representation. If the input does not have
* Hermitian symmetry, the imaginary component is discarded.
*
* \ingroup FourierTransform
*
* \sa ForwardFFTImageFilter, InverseFFTImageFilter
* \ingroup ITKFFT
*
* \sphinx
* \sphinxexample{Filtering/FFT/ComputeInverseFFTOfImage,Compute Inverse FFT Of Image}
* \endsphinx
*/
template <typename TInputImage,
typename TOutputImage = Image<typename TInputImage::PixelType::value_type, TInputImage::ImageDimension>>
class ITK_TEMPLATE_EXPORT InverseFFTImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(InverseFFTImageFilter);
/** Standard class type aliases. */
using InputImageType = TInputImage;
using InputPixelType = typename InputImageType::PixelType;
using OutputImageType = TOutputImage;
using OutputPixelType = typename OutputImageType::PixelType;
using Self = InverseFFTImageFilter;
using Superclass = ImageToImageFilter<InputImageType, OutputImageType>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
static constexpr unsigned int ImageDimension = InputImageType::ImageDimension;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(InverseFFTImageFilter);
/** Customized object creation methods that support configuration-based
* selection of FFT implementation.
*
* Default implementation is VnlFFT. */
itkFactoryOnlyNewMacro(Self);
/* Return the preferred greatest prime factor supported for the input image
* size. Defaults to 2 as many implementations work only for sizes that are
* power of 2.
*/
virtual SizeValueType
GetSizeGreatestPrimeFactor() const;
protected:
InverseFFTImageFilter() = default;
~InverseFFTImageFilter() override = default;
/** This class requires the entire input. */
void
GenerateInputRequestedRegion() override;
/** Sets the output requested region to the largest possible output
* region. */
void
EnlargeOutputRequestedRegion(DataObject * itkNotUsed(output)) override;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkInverseFFTImageFilter.hxx"
#endif
#ifdef ITK_FFTIMAGEFILTERINIT_FACTORY_REGISTER_MANAGER
# include "itkFFTImageFilterInitFactoryRegisterManager.h"
#endif
#endif
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