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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
{
/** \class MedianProjectionImageFilter
* \brief Median projection
*
* This class was contributed to the Insight Journal by Gaetan Lehmann.
* The original paper can be found at
* https://www.insight-journal.org/browse/publication/71
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction,
* INRA de Jouy-en-Josas, France.
*
* \sa ProjectionImageFilter
* \sa StandardDeviationProjectionImageFilter
* \sa SumProjectionImageFilter
* \sa BinaryProjectionImageFilter
* \sa MaximumProjectionImageFilter
* \sa MinimumProjectionImageFilter
* \sa MeanProjectionImageFilter
* \ingroup ITKImageStatistics
*/
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>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(MedianProjectionImageFilter);
/** Method for creation through the object factory. */
itkNewMacro(Self);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
// End concept checking
#endif
protected:
MedianProjectionImageFilter() = default;
~MedianProjectionImageFilter() override = default;
}; // end MedianProjectionImageFilter
} // end namespace itk
#endif
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