itkMeanProjectionImageFilter.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 itkMeanProjectionImageFilter_h
#define itkMeanProjectionImageFilter_h
 
#include "itkProjectionImageFilter.h"
#include "itkConceptChecking.h"
 
namespace itk
{
 
namespace Functor
{
template <typename TInputPixel, typename TAccumulate>
class MeanAccumulator
{
public:
  using RealType = typename NumericTraits<TInputPixel>::RealType;
 
  MeanAccumulator(SizeValueType size)
    : m_Size(size)
  {}
 
  ~MeanAccumulator() { m_Size = SizeValueType{}; }
 
  inline void
  Initialize()
  {
    m_Sum = TAccumulate{};
  }
 
  inline void
  operator()(const TInputPixel & input)
  {
    m_Sum = m_Sum + input;
  }
 
  inline RealType
  GetValue()
  {
    return ((RealType)m_Sum) / m_Size;
  }
 
  TAccumulate   m_Sum;
  SizeValueType m_Size;
};
} // namespace Functor
 
template <typename TInputImage,
          typename TOutputImage,
          typename TAccumulate = typename NumericTraits<typename TOutputImage::PixelType>::AccumulateType>
class MeanProjectionImageFilter
  : public ProjectionImageFilter<TInputImage,
                                 TOutputImage,
                                 Functor::MeanAccumulator<typename TInputImage::PixelType, TAccumulate>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(MeanProjectionImageFilter);
 
  using Self = MeanProjectionImageFilter;
  using Superclass = ProjectionImageFilter<TInputImage,
                                           TOutputImage,
                                           Functor::MeanAccumulator<typename TInputImage::PixelType, TAccumulate>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using InputImageType = TInputImage;
  using InputPixelType = typename InputImageType::PixelType;
 
  using OutputImageType = TOutputImage;
  using OutputPixelType = typename OutputImageType::PixelType;

  itkOverrideGetNameOfClassMacro(MeanProjectionImageFilter);

  itkNewMacro(Self);
 
  itkConceptMacro(InputPixelToOutputPixelTypeGreaterAdditiveOperatorCheck,
                  (Concept::AdditiveOperators<OutputPixelType, InputPixelType, OutputPixelType>));
 
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<InputPixelType>));
 
protected:
  MeanProjectionImageFilter() = default;
  ~MeanProjectionImageFilter() override = default;
}; // end MeanProjectionImageFilter
} // end namespace itk
 
#endif