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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkElasticBodySplineKernelTransform2.txx,v $
Date: $Date: 2004/12/12 22:05:02 $
Version: $Revision: 1.20 $
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 _itkElasticBodySplineKernelTransform2_hxx
#define _itkElasticBodySplineKernelTransform2_hxx
#include "itkElasticBodySplineKernelTransform2.h"
namespace itk
{
template <class TScalarType, unsigned int NDimensions>
ElasticBodySplineKernelTransform2<TScalarType, NDimensions>::ElasticBodySplineKernelTransform2()
{
this->m_Alpha = 12.0 * (1.0 - .25) - 1.0;
}
template <class TScalarType, unsigned int NDimensions>
void
ElasticBodySplineKernelTransform2<TScalarType, NDimensions>::ComputeG(const InputVectorType & x,
GMatrixType & GMatrix) const
{
const TScalarType r = x.GetNorm();
const TScalarType factor = -3.0 * r;
const TScalarType radial = this->m_Alpha * r * r * r;
for (unsigned int i = 0; i < NDimensions; ++i)
{
const typename InputVectorType::ValueType xi = x[i] * factor;
// G is symmetric
for (unsigned int j = 0; j < i; ++j)
{
const TScalarType value = xi * x[j];
GMatrix[i][j] = value;
GMatrix[j][i] = value;
}
GMatrix[i][i] = radial + xi * x[i];
}
} // end ComputeG()
template <class TScalarType, unsigned int NDimensions>
void
ElasticBodySplineKernelTransform2<TScalarType, NDimensions>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "m_Alpha: " << this->m_Alpha << std::endl;
} // end PrintSelf()
} // namespace itk
#endif
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