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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkElasticBodyReciprocalSplineKernelTransform.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:35 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef _itkElasticBodyReciprocalSplineKernelTransform_txx |
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DEF |
#define _itkElasticBodyReciprocalSplineKernelTransform_txx |
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#include "itkElasticBodyReciprocalSplineKernelTransform.h" |
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namespace itk |
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{ |
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template <class TScalarType, unsigned int NDimensions> |
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ElasticBodyReciprocalSplineKernelTransform<TScalarType, NDimensions>:: |
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ElasticBodyReciprocalSplineKernelTransform() |
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{ |
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// Alpha = 8 ( 1 - \nu ) - 1 |
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m_Alpha = 8.0 * ( 1.0 - .25 ) - 1; |
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} |
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template <class TScalarType, unsigned int NDimensions> |
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ElasticBodyReciprocalSplineKernelTransform<TScalarType, NDimensions>:: |
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~ElasticBodyReciprocalSplineKernelTransform() |
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{ |
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} |
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template <class TScalarType, unsigned int NDimensions> |
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const typename ElasticBodyReciprocalSplineKernelTransform<TScalarType, NDimensions>::GMatrixType & |
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ElasticBodyReciprocalSplineKernelTransform<TScalarType, NDimensions> |
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::ComputeG(const InputVectorType & x) const |
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{ |
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const TScalarType r = x.GetNorm(); |
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const TScalarType factor = |
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****( r > 1e-8 ) ? ( -1.0 / r ): NumericTraits<TScalarType>::Zero; |
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const TScalarType radial = m_Alpha * r; |
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for(unsigned int i=0; i<NDimensions; i++) |
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{ |
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const typename InputVectorType::ValueType xi = x[i] * factor; |
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// G is symmetric |
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for(unsigned int j=0; j<i; j++) |
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{ |
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const TScalarType value = xi * x[j]; |
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this->m_GMatrix[i][j] = value; |
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this->m_GMatrix[j][i] = value; |
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} |
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this->m_GMatrix[i][i] = radial + xi * x[i]; |
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} |
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return this->m_GMatrix; |
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} |
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template <class TScalarType, unsigned int NDimensions> |
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void |
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ElasticBodyReciprocalSplineKernelTransform<TScalarType, NDimensions> |
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::PrintSelf(std::ostream& os, Indent indent) const |
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{ |
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Superclass::PrintSelf(os,indent); |
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os << indent << "m_Alpha: " << m_Alpha << std::endl; |
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} |
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} // namespace itk |
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#endif |
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