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/*=========================================================================
*
* Copyright Insight Software 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
*
* http://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
* http://hdl.handle.net/1926/164
*
* \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(){}
inline void Initialize()
{
m_Values.clear();
}
inline void operator()(const TInputPixel & input)
{
m_Values.push_back(input);
}
inline TInputPixel GetValue()
{
typedef typename std::vector< TInputPixel >::iterator ContainerIterator;
ContainerIterator 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;
};
} // end namespace Function
template< typename TInputImage, typename TOutputImage >
class MedianProjectionImageFilter:public
ProjectionImageFilter< TInputImage, TOutputImage,
Functor::MedianAccumulator< typename TInputImage::PixelType > >
{
public:
typedef MedianProjectionImageFilter Self;
typedef ProjectionImageFilter< TInputImage, TOutputImage,
Functor::MedianAccumulator<
typename TInputImage::PixelType > > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Runtime information support. */
itkTypeMacro(MedianProjectionImageFilter, ProjectionImageFilter);
/** Method for creation through the object factory. */
itkNewMacro(Self);
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
// End concept checking
#endif
protected:
MedianProjectionImageFilter() {}
virtual ~MedianProjectionImageFilter() {}
private:
MedianProjectionImageFilter(const Self &); //purposely not implemented
void operator=(const Self &); //purposely not implemented
}; // end MedianProjectionImageFilter
} //end namespace itk
#endif
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