rtkFFTRampImageFilter.h

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/*=========================================================================
 *
 *  Copyright RTK 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
 *
 *         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 rtkFFTRampImageFilter_h
#define rtkFFTRampImageFilter_h

#include <itkConceptChecking.h>
#include "rtkConfiguration.h"
#include "rtkFFTProjectionsConvolutionImageFilter.h"
#include "rtkMacro.h"

// The Set macro is redefined to clear the current FFT kernel when a parameter
// is modified.
#undef itkSetMacro
#define itkSetMacro(name, type)                                                                                        \
  virtual void Set##name(const type _arg)                                                                              \
  {                                                                                                                    \
    itkDebugMacro("setting " #name " to " << _arg);                                                                    \
    CLANG_PRAGMA_PUSH                                                                                                  \
    CLANG_SUPPRESS_Wfloat_equal if (this->m_##name != _arg)                                                            \
    {                                                                                                                  \
      this->m_##name = _arg;                                                                                           \
      this->Modified();                                                                                                \
      this->m_KernelFFT = nullptr;                                                                                     \
    }                                                                                                                  \
    CLANG_PRAGMA_POP                                                                                                   \
  }

namespace rtk
{

template <class TInputImage, class TOutputImage = TInputImage, class TFFTPrecision = double>
class ITK_TEMPLATE_EXPORT FFTRampImageFilter
  : public rtk::FFTProjectionsConvolutionImageFilter<TInputImage, TOutputImage, TFFTPrecision>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(FFTRampImageFilter);

  using Self = FFTRampImageFilter;
  using Superclass = rtk::FFTProjectionsConvolutionImageFilter<TInputImage, TOutputImage, TFFTPrecision>;
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;

  using InputImageType = TInputImage;
  using OutputImageType = TOutputImage;
  using FFTPrecisionType = TFFTPrecision;
  using IndexType = typename InputImageType::IndexType;
  using SizeType = typename InputImageType::SizeType;

  using FFTInputImageType = typename Superclass::FFTInputImageType;
  using FFTInputImagePointer = typename FFTInputImageType::Pointer;
  using FFTOutputImageType = typename Superclass::FFTOutputImageType;
  using FFTOutputImagePointer = typename FFTOutputImageType::Pointer;

  itkNewMacro(Self);

  itkTypeMacro(FFTRampImageFilter, FFTProjectionsConvolutionImageFilter);

  itkGetConstMacro(HannCutFrequency, double);
  itkSetMacro(HannCutFrequency, double);

  itkGetConstMacro(CosineCutFrequency, double);
  itkSetMacro(CosineCutFrequency, double);

  itkGetConstMacro(HammingFrequency, double);
  itkSetMacro(HammingFrequency, double);

  itkGetConstMacro(HannCutFrequencyY, double);
  itkSetMacro(HannCutFrequencyY, double);

  itkGetConstMacro(RamLakCutFrequency, double);
  itkSetMacro(RamLakCutFrequency, double);

  itkGetConstMacro(SheppLoganCutFrequency, double);
  itkSetMacro(SheppLoganCutFrequency, double);

protected:
  FFTRampImageFilter();
  ~FFTRampImageFilter() override = default;

  void
  GenerateInputRequestedRegion() override;

  void
  UpdateFFTProjectionsConvolutionKernel(const SizeType s) override;

private:
  double m_HannCutFrequency{ 0. };
  double m_CosineCutFrequency{ 0. };
  double m_HammingFrequency{ 0. };
  double m_HannCutFrequencyY{ 0. };

  double m_RamLakCutFrequency{ 0. };
  double m_SheppLoganCutFrequency{ 0. };

  SizeType m_PreviousKernelUpdateSize;
}; // end of class

} // end namespace rtk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "rtkFFTRampImageFilter.hxx"
#endif

// Rollback to the original definition of the Set macro
#undef itkSetMacro
#define itkSetMacro(name, type)                                                                                        \
  virtual void Set##name(const type _arg)                                                                              \
  {                                                                                                                    \
    itkDebugMacro("setting " #name " to " << _arg);                                                                    \
    CLANG_PRAGMA_PUSH                                                                                                  \
    CLANG_SUPPRESS_Wfloat_equal if (this->m_##name != _arg)                                                            \
    {                                                                                                                  \
      this->m_##name = _arg;                                                                                           \
      this->Modified();                                                                                                \
    }                                                                                                                  \
    CLANG_PRAGMA_POP                                                                                                   \
  }

#endif