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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.
*
*=========================================================================*/
#ifndef itkBSplineInterpolationSecondOrderDerivativeWeightFunction_hxx
#define itkBSplineInterpolationSecondOrderDerivativeWeightFunction_hxx
#include "itkBSplineInterpolationSecondOrderDerivativeWeightFunction.h"
#include "itkImage.h"
#include "itkImageRegionConstIteratorWithIndex.h"
#include <vnl/vnl_vector.h>
namespace itk
{
/**
* ****************** Constructor *******************************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
BSplineInterpolationSecondOrderDerivativeWeightFunction<TCoordinate, VSpaceDimension, VSplineOrder>::
BSplineInterpolationSecondOrderDerivativeWeightFunction()
{
/** Initialize members. */
this->m_DerivativeDirections.fill(0);
this->m_EqualDerivativeDirections = true;
} // end Constructor
/**
* ******************* SetDerivativeDirections *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
void
BSplineInterpolationSecondOrderDerivativeWeightFunction<TCoordinate, VSpaceDimension, VSplineOrder>::
SetDerivativeDirections(unsigned int dir0, unsigned int dir1)
{
if (dir0 != this->m_DerivativeDirections[0] || dir1 != this->m_DerivativeDirections[1])
{
if (dir0 < SpaceDimension && dir1 < SpaceDimension)
{
this->m_DerivativeDirections[0] = dir0;
this->m_DerivativeDirections[1] = dir1;
this->m_EqualDerivativeDirections = false;
if (dir0 == dir1)
{
this->m_EqualDerivativeDirections = true;
}
this->Modified();
}
}
} // end SetDerivativeDirections()
/**
* ******************* PrintSelf *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
void
BSplineInterpolationSecondOrderDerivativeWeightFunction<TCoordinate, VSpaceDimension, VSplineOrder>::PrintSelf(
std::ostream & os,
Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "DerivativeDirections: [" << this->m_DerivativeDirections[0] << ", "
<< this->m_DerivativeDirections[1] << "]" << std::endl;
os << indent << "EqualDerivativeDirections: " << this->m_EqualDerivativeDirections << std::endl;
} // end PrintSelf()
/**
* ******************* Compute1DWeights *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
void
BSplineInterpolationSecondOrderDerivativeWeightFunction<TCoordinate, VSpaceDimension, VSplineOrder>::Compute1DWeights(
const ContinuousIndexType & index,
const IndexType & startIndex,
OneDWeightsType & weights1D) const
{
/** Compute the 1D weights. */
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
double x = index[i] - static_cast<double>(startIndex[i]);
if (i != this->m_DerivativeDirections[0] && i != this->m_DerivativeDirections[1])
{
for (unsigned int k = 0; k < VSplineOrder + 1; ++k)
{
weights1D[i][k] = KernelType::FastEvaluate(x);
x -= 1.0;
}
}
else
{
if (this->m_EqualDerivativeDirections)
{
for (unsigned int k = 0; k < VSplineOrder + 1; ++k)
{
weights1D[i][k] = SecondOrderDerivativeKernelType::FastEvaluate(x);
x -= 1.0;
}
}
else
{
for (unsigned int k = 0; k < VSplineOrder + 1; ++k)
{
weights1D[i][k] = DerivativeKernelType::FastEvaluate(x);
x -= 1.0;
}
}
}
}
} // end Compute1DWeights()
} // end namespace itk
#endif
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