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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBinaryMinMaxCurvatureFlowFunction.txx,v $
Language: C++
Date: $Date: 2004-12-21 22:47:26 $
Version: $Revision: 1.12 $
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 __itkBinaryMinMaxCurvatureFlowFunction_txx
#define __itkBinaryMinMaxCurvatureFlowFunction_txx
#include "itkBinaryMinMaxCurvatureFlowFunction.h"
#include "vnl/vnl_math.h"
#include "itkNeighborhoodInnerProduct.h"
namespace itk {
/*
* Constructor
*/
template<class TImage>
BinaryMinMaxCurvatureFlowFunction<TImage>
::BinaryMinMaxCurvatureFlowFunction()
{
m_Threshold = 0.0;
}
/*
* Update the solution at pixels which does not lie on the
* data boundary.
*/
template<class TImage>
typename BinaryMinMaxCurvatureFlowFunction<TImage>::PixelType
BinaryMinMaxCurvatureFlowFunction<TImage>
::ComputeUpdate(const NeighborhoodType &it, void * globalData,
const FloatOffsetType& offset)
{
typedef CurvatureFlowFunction<TImage> CurvatureFlowFunctionType;
PixelType update = this->CurvatureFlowFunctionType::ComputeUpdate(
it, globalData, offset );
if ( update == 0.0 )
{
return update;
}
NeighborhoodInnerProduct<ImageType> innerProduct;
PixelType avgValue = innerProduct( it, this->m_StencilOperator );
if ( avgValue < m_Threshold )
{
return ( vnl_math_min( update, NumericTraits<PixelType>::Zero ) );
}
else
{
return ( vnl_math_max( update, NumericTraits<PixelType>::Zero ) );
}
}
} // end namespace itk
#endif
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