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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkLevelSetVelocityNeighborhoodExtractor.txx,v $
Language: C++
Date: $Date: 2005-03-13 23:51:11 $
Version: $Revision: 1.23 $
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 _itkLevelSetVelocityNeighborhoodExtractor_txx
#define _itkLevelSetVelocityNeighborhoodExtractor_txx
#include "itkLevelSetVelocityNeighborhoodExtractor.h"
#include "vnl/vnl_math.h"
namespace itk
{
/*
*
*/
template <class TLevelSet, class TAuxValue,
unsigned int VAuxDimension>
LevelSetVelocityNeighborhoodExtractor<TLevelSet,TAuxValue,VAuxDimension>
::LevelSetVelocityNeighborhoodExtractor( )
{
m_AuxInsideValues = 0;
m_AuxOutsideValues = 0;
for (unsigned int i=0; i < VAuxDimension; ++i)
{
m_AuxImage[i] = 0;
}
}
/*
*
*/
template <class TLevelSet, class TAuxValue,
unsigned int VAuxDimension>
void
LevelSetVelocityNeighborhoodExtractor<TLevelSet,TAuxValue,VAuxDimension>
::PrintSelf(std::ostream &os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Input aux image: [";
unsigned int j;
for( j = 0; j+1 < VAuxDimension; j++ )
{
os << m_AuxImage[j].GetPointer() << ", ";
}
os << m_AuxImage[j].GetPointer() << "]" << std::endl;
os << indent << "AuxInsideValues: " <<
m_AuxInsideValues.GetPointer() << std::endl;
os << indent << "AuxOutsideValues: " <<
m_AuxOutsideValues.GetPointer() << std::endl;
}
/*
*
*/
template <class TLevelSet, class TAuxValue,
unsigned int VAuxDimension>
void
LevelSetVelocityNeighborhoodExtractor<TLevelSet,TAuxValue,VAuxDimension>
::Initialize()
{
this->Superclass::Initialize();
// create new empty auxiliary variable containers
m_AuxInsideValues = AuxValueContainer::New();
m_AuxOutsideValues = AuxValueContainer::New();
}
/*
*
*/
template <class TLevelSet, class TAuxValue,
unsigned int VAuxDimension>
double
LevelSetVelocityNeighborhoodExtractor<TLevelSet,TAuxValue,VAuxDimension>
::CalculateDistance(
Index& index)
{
double distance = this->Superclass::CalculateDistance( index );
if( distance >= this->GetLargeValue() )
{
return distance;
}
double centerValue[VAuxDimension];
AuxValueType auxPixel;
AuxValueVectorType auxVector;
for( unsigned int k = 0; k < VAuxDimension; k++ )
{
auxPixel = m_AuxImage[k]->GetPixel( index );
centerValue[k] = (double) auxPixel;
}
// if distance is zero, insert point in inside container
if( this->GetLastPointIsInside() )
{
for( unsigned int k = 0; k < VAuxDimension; k++ )
{
auxVector[k] = centerValue[k];
}
m_AuxInsideValues->InsertElement( m_AuxInsideValues->Size(), auxVector );
return distance;
}
double denom = 0.0;
double numer[VAuxDimension];
typename Superclass::NodeType neighNode;
for( unsigned int k = 0; k < VAuxDimension; k++ )
{
numer[k] = 0.0;
}
// The extend velcoity value is a weighted value of
// the speed values at point used in the computation
// of the distance by the superclass.
//
// The weights is proportional to one over the square
// of distance along the grid line to the zero set
// crossing.
for( unsigned int j = 0; j < SetDimension; j++ )
{
neighNode = this->GetNodeUsedInCalculation(j);
if( neighNode.GetValue() >= this->GetLargeValue() )
{
break;
}
denom += 1.0 / vnl_math_sqr( (double)neighNode.GetValue() );
for( unsigned int k = 0; k < VAuxDimension; k++ )
{
auxPixel = m_AuxImage[k]->GetPixel( neighNode.GetIndex() );
numer[k] += (double) ( auxPixel ) / vnl_math_sqr( (double)neighNode.GetValue() );
}
}
for( unsigned int k = 0; k < VAuxDimension; k++ )
{
numer[k] /= denom;
auxVector[k] = numer[k];
}
if( this->GetLastPointIsInside() )
{
m_AuxInsideValues->InsertElement(
m_AuxInsideValues->Size(), auxVector );
}
else
{
m_AuxOutsideValues->InsertElement(
m_AuxOutsideValues->Size(), auxVector );
}
return distance;
}
} // namespace itk
#endif
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