itkVnlForwardFFTImageFilter.h

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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 itkVnlForwardFFTImageFilter_h
#define itkVnlForwardFFTImageFilter_h
 
#include "itkForwardFFTImageFilter.h"
 
#include "vnl/algo/vnl_fft_base.h"
#include "itkFFTImageFilterFactory.h"
 
namespace itk
{
template <typename TInputImage,
          typename TOutputImage = Image<std::complex<typename TInputImage::PixelType>, TInputImage::ImageDimension>>
class ITK_TEMPLATE_EXPORT VnlForwardFFTImageFilter : public ForwardFFTImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VnlForwardFFTImageFilter);

  using InputImageType = TInputImage;
  using InputPixelType = typename InputImageType::PixelType;
  using InputSizeType = typename InputImageType::SizeType;
  using InputSizeValueType = typename InputImageType::SizeValueType;
  using OutputImageType = TOutputImage;
  using OutputPixelType = typename OutputImageType::PixelType;
 
  using Self = VnlForwardFFTImageFilter;
  using Superclass = ForwardFFTImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(VnlForwardFFTImageFilter);

  static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
  static constexpr unsigned int InputImageDimension = TInputImage::ImageDimension;
  static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
 
  SizeValueType
  GetSizeGreatestPrimeFactor() const override;
 
  itkConceptMacro(ImageDimensionsMatchCheck, (Concept::SameDimension<InputImageDimension, OutputImageDimension>));
 
protected:
  VnlForwardFFTImageFilter() = default;
  ~VnlForwardFFTImageFilter() override = default;
 
  void
  GenerateData() override;
 
private:
  using SignalVectorType = vnl_vector<std::complex<InputPixelType>>;
};
 
// Describe whether input/output are real- or complex-valued
// for factory registration
template <>
struct FFTImageFilterTraits<VnlForwardFFTImageFilter>
{
  template <typename TUnderlying>
  using InputPixelType = TUnderlying;
  template <typename TUnderlying>
  using OutputPixelType = std::complex<TUnderlying>;
  using FilterDimensions = std::integer_sequence<unsigned int, 4, 3, 2, 1>;
};
} // namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkVnlForwardFFTImageFilter.hxx"
#endif
 
#endif