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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 itkComplexToComplex1DFFTImageFilter_h
#define itkComplexToComplex1DFFTImageFilter_h
#include <complex>
#include "itkImage.h"
#include "itkImageToImageFilter.h"
#include "itkMacro.h"
namespace itk
{
/** \class ComplexToComplex1DFFTImageFilter
* \brief Perform the Fast Fourier Transform, complex input to complex output,
* but only along one dimension.
*
* The direction of the transform, 'Forward' or 'Inverse', can be set with
* SetTransformDirection() and GetTransformDirection().
*
* The dimension along which to apply to filter can be specified with
* SetDirection() and GetDirection().
*
* \ingroup ITKFFT
* \ingroup FourierTransform
*/
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT ComplexToComplex1DFFTImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ComplexToComplex1DFFTImageFilter);
/** Standard class type alias. */
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
using OutputImageRegionType = typename OutputImageType::RegionType;
using Self = ComplexToComplex1DFFTImageFilter;
using Superclass = ImageToImageFilter<InputImageType, OutputImageType>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Dimension of the underlying image. */
static constexpr unsigned int ImageDimension = InputImageType::ImageDimension;
itkOverrideGetNameOfClassMacro(ComplexToComplex1DFFTImageFilter);
/** Customized object creation methods that support configuration-based
* selection of FFT implementation.
*
* Default implementation is VnlFFT1D.
*/
itkFactoryOnlyNewMacro(Self);
/** Transform direction. */
enum TransformDirectionType
{
DIRECT = 1,
INVERSE
};
/** Set/Get the direction in which the transform will be applied.
* By selecting DIRECT, this filter will perform a direct (forward) Fourier
* Transform.
* By selecting INVERSE, this filter will perform an inverse Fourier
* Transform. */
itkSetMacro(TransformDirection, TransformDirectionType);
itkGetConstMacro(TransformDirection, TransformDirectionType);
/** Get the direction in which the filter is to be applied. */
itkGetConstMacro(Direction, unsigned int);
/** Set the direction in which the filter is to be applied. */
itkSetClampMacro(Direction, unsigned int, 0, InputImageType::ImageDimension - 1);
/** Get the greatest supported prime factor. */
virtual SizeValueType
GetSizeGreatestPrimeFactor() const
{
return 2;
}
protected:
ComplexToComplex1DFFTImageFilter();
~ComplexToComplex1DFFTImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
void
GenerateInputRequestedRegion() override;
void
EnlargeOutputRequestedRegion(DataObject * output) override;
/** Direction in which the filter is to be applied
* this should be in the range [0,ImageDimension-1]. */
unsigned int m_Direction{ 0 };
/** Direction to apply the transform (forward/inverse). */
TransformDirectionType m_TransformDirection{ DIRECT };
private:
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkComplexToComplex1DFFTImageFilter.hxx"
#endif
#ifdef ITK_FFTIMAGEFILTERINIT_FACTORY_REGISTER_MANAGER
# include "itkFFTImageFilterInitFactoryRegisterManager.h"
#endif
#endif // itkComplexToComplex1DFFTImageFilter_h
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