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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkLaplacianOperator.txx,v $
Language: C++
Date: $Date: 2004-12-20 00:04:47 $
Version: $Revision: 1.13 $
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 _itkLaplacianOperator_txx
#define _itkLaplacianOperator_txx
#include "itkLaplacianOperator.h"
namespace itk
{
template<class TPixel, unsigned int VDimension, class TAllocator>
void
LaplacianOperator<TPixel, VDimension, TAllocator>
::SetDerivativeScalings( const double *s )
{
for (unsigned int i = 0; i < VDimension; ++i)
{
m_DerivativeScalings[i] = s[i];
}
}
//Create the operator
template <class TPixel, unsigned int VDimension, class TAllocator>
void
LaplacianOperator<TPixel, VDimension, TAllocator>
::CreateOperator()
{
CoefficientVector coefficients;
coefficients = this->GenerateCoefficients();
this->Fill(coefficients);
}
//This function fills the coefficients into the corresponding neighborhodd.
template <class TPixel, unsigned int VDimension, class TAllocator>
void
LaplacianOperator <TPixel, VDimension, TAllocator>
::Fill(const CoefficientVector &coeff)
{
typename Superclass::CoefficientVector::const_iterator it;
std::slice* temp_slice;
temp_slice = new std::slice(0, coeff.size(),1);
typename Self::SliceIteratorType data(this, *temp_slice);
delete temp_slice;
it = coeff.begin();
// Copy the coefficients into the neighborhood
for (data = data.Begin(); data < data.End(); ++data, ++it)
{
*data = *it;
}
}
template <class TPixel, unsigned int VDimension, class TAllocator>
typename LaplacianOperator<TPixel, VDimension, TAllocator>
::CoefficientVector
LaplacianOperator<TPixel, VDimension, TAllocator>
::GenerateCoefficients()
{
unsigned int i, w;
// Here we set the radius to 1's, here the
// operator is 3x3 for 2D, 3x3x3 for 3D.
SizeType r;
r.Fill(1);
this->SetRadius(r);
// Create a vector of the correct size to hold the coefficients.
w = this->Size();
CoefficientVector coeffP(w);
//Set the coefficients
double sum = 0.0;
double hsq;
long stride;
for (i = 0 ; i < 2 * VDimension; i+=2)
{
stride = static_cast<long>( this->GetStride(i/2) );
hsq = m_DerivativeScalings[ i / 2]*m_DerivativeScalings[ i / 2];
coeffP[w/2 - stride] = coeffP[w/2 + stride] = hsq;
sum += 2.0*hsq;
}
coeffP[w/2] = - sum;
return coeffP;
}
} // namespace itk
#endif
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