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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkScatterMatrixImageFunction.txx,v $
Language: C++
Date: $Date: 2006-02-06 22:01:58 $
Version: $Revision: 1.3 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkScatterMatrixImageFunction_txx
#define __itkScatterMatrixImageFunction_txx
#include "itkScatterMatrixImageFunction.h"
#include "itkNumericTraits.h"
#include "itkConstNeighborhoodIterator.h"
namespace itk
{
/**
* Constructor
*/
template <class TInputImage, class TCoordRep>
ScatterMatrixImageFunction<TInputImage,TCoordRep>
::ScatterMatrixImageFunction()
{
m_NeighborhoodRadius = 1;
}
/**
*
*/
template <class TInputImage, class TCoordRep>
void
ScatterMatrixImageFunction<TInputImage,TCoordRep>
::PrintSelf(std::ostream& os, Indent indent) const
{
this->Superclass::PrintSelf(os,indent);
os << indent << "NeighborhoodRadius: " << m_NeighborhoodRadius << std::endl;
}
/**
*
*/
template <class TInputImage, class TCoordRep>
typename ScatterMatrixImageFunction<TInputImage,TCoordRep>
::RealType
ScatterMatrixImageFunction<TInputImage,TCoordRep>
::EvaluateAtIndex(const IndexType& index) const
{
RealType covariance;
typedef typename TInputImage::PixelType PixelType;
typedef typename PixelType::ValueType PixelComponentType;
typedef typename NumericTraits< PixelComponentType >::RealType PixelComponentRealType;
const unsigned int VectorDimension =
::itk::GetVectorDimension< PixelType >::VectorDimension;
covariance = vnl_matrix< PixelComponentRealType >( VectorDimension, VectorDimension );
covariance.fill( NumericTraits< PixelComponentRealType >::Zero );
if( !this->GetInputImage() )
{
covariance.fill( NumericTraits< PixelComponentRealType >::max() );
return covariance;
}
if ( !this->IsInsideBuffer( index ) )
{
covariance.fill( NumericTraits< PixelComponentRealType >::max() );
return covariance;
}
// 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);
// Walk the neighborhood
const unsigned int size = it.Size();
for (unsigned int i = 0; i < size; ++i)
{
for(unsigned int dimx=0; dimx<VectorDimension; dimx++)
{
for(unsigned int dimy=0; dimy<VectorDimension; dimy++)
{
covariance[dimx][dimy] +=
static_cast<PixelComponentRealType>( it.GetPixel(i)[dimx] ) *
static_cast<PixelComponentRealType>( it.GetPixel(i)[dimy] );
}
}
}
for(unsigned int dimx=0; dimx<VectorDimension; dimx++)
{
for(unsigned int dimy=0; dimy<VectorDimension; dimy++)
{
covariance[dimx][dimy] /= double( size );
}
}
return ( covariance );
}
} // end namespace itk
#endif
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