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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 itkMedianImageFunction_hxx
#define itkMedianImageFunction_hxx
#include "itkMedianImageFunction.h"
#include "itkConstNeighborhoodIterator.h"
#include <vector>
#include <algorithm>
namespace itk
{
/**
* Constructor
*/
template< typename TInputImage, typename TCoordRep >
MedianImageFunction< TInputImage, TCoordRep >
::MedianImageFunction() : m_NeighborhoodRadius(1)
{
}
/**
*
*/
template< typename TInputImage, typename TCoordRep >
void
MedianImageFunction< TInputImage, TCoordRep >
::PrintSelf(std::ostream & os, Indent indent) const
{
this->Superclass::PrintSelf(os, indent);
os << indent << "NeighborhoodRadius: " << m_NeighborhoodRadius << std::endl;
}
/**
*
*/
template< typename TInputImage, typename TCoordRep >
typename MedianImageFunction< TInputImage, TCoordRep >
::OutputType
MedianImageFunction< TInputImage, TCoordRep >
::EvaluateAtIndex(const IndexType & index) const
{
unsigned int i;
if ( !this->GetInputImage() )
{
return ( NumericTraits< OutputType >::max() );
}
if ( !this->IsInsideBuffer(index) )
{
return ( NumericTraits< OutputType >::max() );
}
// Create an N-d neighborhood kernel, using a zeroflux boundary condition
typename InputImageType::SizeType kernelSize;
kernelSize.Fill( m_NeighborhoodRadius );
ConstNeighborhoodIterator< InputImageType >
it( kernelSize, this->GetInputImage(), this->GetInputImage()->GetBufferedRegion() );
// Set the iterator at the desired location
it.SetLocation(index);
// We have to copy the pixels so we can run std::nth_element.
std::vector< InputPixelType > pixels;
typename std::vector< InputPixelType >::iterator medianIterator;
// Walk the neighborhood
for ( i = 0; i < it.Size(); ++i )
{
pixels.push_back( it.GetPixel(i) );
}
// Get the median value
unsigned int medianPosition = it.Size() / 2;
medianIterator = pixels.begin() + medianPosition;
std::nth_element( pixels.begin(), medianIterator, pixels.end() );
return ( *medianIterator );
}
} // namespace itk
#endif
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