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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 itkBSplineInterpolationWeightFunctionBase_hxx
#define itkBSplineInterpolationWeightFunctionBase_hxx
#include "itkBSplineInterpolationWeightFunctionBase.h"
namespace itk
{
/**
* ******************* PrintSelf *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
void
BSplineInterpolationWeightFunctionBase<TCoordinate, VSpaceDimension, VSplineOrder>::PrintSelf(std::ostream & os,
Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "OffsetToIndexTable: " << this->m_OffsetToIndexTable << std::endl;
} // end PrintSelf()
/**
* ******************* ComputeStartIndex *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
auto
BSplineInterpolationWeightFunctionBase<TCoordinate, VSpaceDimension, VSplineOrder>::ComputeStartIndex(
const ContinuousIndexType & cindex) -> IndexType
{
IndexType startIndex;
/** Find the starting index of the support region. */
for (unsigned int i = 0; i < SpaceDimension; ++i)
{
startIndex[i] = static_cast<typename IndexType::IndexValueType>(
std::floor(cindex[i] - static_cast<double>(VSplineOrder - 1.0) / 2.0));
}
return startIndex;
} // end ComputeStartIndex()
/**
* ******************* Evaluate *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
auto
BSplineInterpolationWeightFunctionBase<TCoordinate, VSpaceDimension, VSplineOrder>::Evaluate(
const ContinuousIndexType & cindex) const -> WeightsType
{
/** Construct arguments for the Evaluate function that really does the work. */
const IndexType startIndex = Self::ComputeStartIndex(cindex);
/** Call the Evaluate function that really does the work. */
return this->Evaluate(cindex, startIndex);
} // end Evaluate()
/**
* ******************* Evaluate *******************
*/
template <typename TCoordinate, unsigned int VSpaceDimension, unsigned int VSplineOrder>
auto
BSplineInterpolationWeightFunctionBase<TCoordinate, VSpaceDimension, VSplineOrder>::Evaluate(
const ContinuousIndexType & cindex,
const IndexType & startIndex) const -> WeightsType
{
static_assert(WeightsType::Dimension == NumberOfWeights);
WeightsType weights;
/** Compute the 1D weights. */
OneDWeightsType weights1D;
this->Compute1DWeights(cindex, startIndex, weights1D);
/** Compute the vector of weights. */
for (unsigned int k = 0; k < NumberOfWeights; ++k)
{
double tmp1 = 1.0;
const auto tmp2 = m_OffsetToIndexTable[k];
for (unsigned int j = 0; j < SpaceDimension; ++j)
{
tmp1 *= weights1D[j][tmp2[j]];
}
weights[k] = tmp1;
}
return weights;
} // end Evaluate()
} // end namespace itk
#endif
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