itkMedianProjectionImageFilter.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 itkMedianProjectionImageFilter_h
#define itkMedianProjectionImageFilter_h
 
#include "itkProjectionImageFilter.h"
#include "itkConceptChecking.h"
 
#include <vector>
#include <algorithm>
 
namespace itk
{
 
namespace Functor
{
template <typename TInputPixel>
class MedianAccumulator
{
public:
  MedianAccumulator(SizeValueType size) { m_Values.reserve(size); }
 
  ~MedianAccumulator() = default;
 
  inline void
  Initialize()
  {
    m_Values.clear();
  }
 
  inline void
  operator()(const TInputPixel & input)
  {
    m_Values.push_back(input);
  }
 
  inline TInputPixel
  GetValue()
  {
    auto medianIterator = m_Values.begin() + m_Values.size() / 2;
    std::nth_element(m_Values.begin(), medianIterator, m_Values.end());
    return *medianIterator;
  }
 
  std::vector<TInputPixel> m_Values;
};
} // namespace Functor
 
template <typename TInputImage, typename TOutputImage>
class MedianProjectionImageFilter
  : public ProjectionImageFilter<TInputImage, TOutputImage, Functor::MedianAccumulator<typename TInputImage::PixelType>>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(MedianProjectionImageFilter);
 
  using Self = MedianProjectionImageFilter;
  using Superclass =
    ProjectionImageFilter<TInputImage, TOutputImage, Functor::MedianAccumulator<typename TInputImage::PixelType>>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkOverrideGetNameOfClassMacro(MedianProjectionImageFilter);

  itkNewMacro(Self);
 
protected:
  MedianProjectionImageFilter() = default;
  ~MedianProjectionImageFilter() override = default;
}; // end MedianProjectionImageFilter
} // end namespace itk
 
#endif