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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 itkHalfHermitianToRealInverseFFTImageFilter_h
#define itkHalfHermitianToRealInverseFFTImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkMacro.h"
#include "itkSimpleDataObjectDecorator.h"
namespace itk
{
/**
* \class HalfHermitianToRealInverseFFTImageFilter
*
* \brief Base class for specialized complex-to-real 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 class available on the
* system when the object is created via the object factory system.
*
* The input to this filter is assumed to have the same format as the
* output of the RealToHalfHermitianForwardFFTImageFilter. That is, the
* input is assumed to consist of roughly half the full complex image
* resulting from a real-to-complex discrete Fourier transform. This
* half is expected to be the first half of the image in the
* X-dimension. Because this filter assumes that the input stores only
* about half of the non-redundant complex pixels, the output is
* larger in the X-dimension than it is in the input. To determine the
* actual size of the output image, this filter needs additional
* information in the form of a flag indicating whether the output
* image has an odd size in the X-dimension. Use
* SetActualXDimensionIsOdd() to set this flag.
*
* \ingroup FourierTransform
*
* \sa ForwardFFTImageFilter, HalfHermitianToRealInverseFFTImageFilter
* \ingroup ITKFFT
*/
template <typename TInputImage,
typename TOutputImage = Image<typename TInputImage::PixelType::value_type, TInputImage::ImageDimension>>
class ITK_TEMPLATE_EXPORT HalfHermitianToRealInverseFFTImageFilter
: public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(HalfHermitianToRealInverseFFTImageFilter);
/** Standard class type aliases. */
using InputImageType = TInputImage;
using InputPixelType = typename InputImageType::PixelType;
using OutputImageType = TOutputImage;
using OutputPixelType = typename OutputImageType::PixelType;
using Self = HalfHermitianToRealInverseFFTImageFilter;
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(HalfHermitianToRealInverseFFTImageFilter);
/** Customized object creation methods that support configuration-based
* selection of FFT implementation.
*
* Default implementation is VnlFFT. */
itkFactoryOnlyNewMacro(Self);
/** Was the original truncated dimension size odd? */
itkSetGetDecoratedInputMacro(ActualXDimensionIsOdd, bool);
itkBooleanMacro(ActualXDimensionIsOdd);
/* 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:
HalfHermitianToRealInverseFFTImageFilter();
~HalfHermitianToRealInverseFFTImageFilter() override = default;
/** The output may be a different size from the input if complex conjugate
* symmetry is implicit. */
void
GenerateOutputInformation() override;
/** 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 "itkHalfHermitianToRealInverseFFTImageFilter.hxx"
#endif
#ifdef ITK_FFTIMAGEFILTERINIT_FACTORY_REGISTER_MANAGER
# include "itkFFTImageFilterInitFactoryRegisterManager.h"
#endif
#endif
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