/usr/include/ITK-4.5/itkBSplineInterpolationWeightFunction.hxx is in libinsighttoolkit4-dev 4.5.0-3.
This file is owned by root:root, with mode 0o644.
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*
* Copyright Insight Software Consortium
*
* 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 __itkBSplineInterpolationWeightFunction_hxx
#define __itkBSplineInterpolationWeightFunction_hxx
#include "itkBSplineInterpolationWeightFunction.h"
#include "itkImage.h"
#include "itkMatrix.h"
#include "itkMath.h"
#include "itkImageRegionConstIteratorWithIndex.h"
namespace itk
{
/** Constructor */
template< typename TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder >
BSplineInterpolationWeightFunction< TCoordRep, VSpaceDimension, VSplineOrder >
::BSplineInterpolationWeightFunction()
{
// Initialize the number of weights;
m_NumberOfWeights =
static_cast< unsigned int >( vcl_pow( static_cast< double >( SplineOrder + 1 ),
static_cast< double >( SpaceDimension ) ) );
// Initialize support region is a hypercube of length SplineOrder + 1
m_SupportSize.Fill(SplineOrder + 1);
// Initialize offset to index lookup table
m_OffsetToIndexTable.set_size(m_NumberOfWeights, SpaceDimension);
typedef Image< char, SpaceDimension > CharImageType;
typename CharImageType::Pointer tempImage = CharImageType::New();
tempImage->SetRegions(m_SupportSize);
tempImage->Allocate();
tempImage->FillBuffer(0);
typedef ImageRegionConstIteratorWithIndex< CharImageType > IteratorType;
IteratorType iterator( tempImage, tempImage->GetBufferedRegion() );
unsigned int counter = 0;
while ( !iterator.IsAtEnd() )
{
for ( unsigned int j = 0; j < SpaceDimension; j++ )
{
m_OffsetToIndexTable[counter][j] = iterator.GetIndex()[j];
}
++counter;
++iterator;
}
// Initialize the interpolation kernel
m_Kernel = KernelType::New();
}
/**
* Standard "PrintSelf" method
*/
template< typename TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder >
void
BSplineInterpolationWeightFunction< TCoordRep, VSpaceDimension, VSplineOrder >
::PrintSelf(
std::ostream & os,
Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "NumberOfWeights: " << m_NumberOfWeights << std::endl;
os << indent << "SupportSize: " << m_SupportSize << std::endl;
}
/** Compute weights for interpolation at continuous index position */
template< typename TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder >
typename BSplineInterpolationWeightFunction< TCoordRep, VSpaceDimension,
VSplineOrder >
::WeightsType
BSplineInterpolationWeightFunction< TCoordRep, VSpaceDimension, VSplineOrder >
::Evaluate(
const ContinuousIndexType & index) const
{
WeightsType weights(m_NumberOfWeights);
IndexType startIndex;
this->Evaluate(index, weights, startIndex);
return weights;
}
/** Compute weights for interpolation at continuous index position */
template< typename TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder >
void BSplineInterpolationWeightFunction< TCoordRep, VSpaceDimension,
VSplineOrder >
::Evaluate(
const ContinuousIndexType & index,
WeightsType & weights,
IndexType & startIndex) const
{
unsigned int j, k;
// Find the starting index of the support region
for ( j = 0; j < SpaceDimension; j++ )
{
startIndex[j] = Math::Floor< IndexValueType >(index[j] - static_cast< double >( SplineOrder - 1 ) / 2.0);
}
// Compute the weights
Matrix< double, SpaceDimension, SplineOrder + 1 > weights1D;
for ( j = 0; j < SpaceDimension; j++ )
{
double x = index[j] - static_cast< double >( startIndex[j] );
for ( k = 0; k <= SplineOrder; k++ )
{
weights1D[j][k] = m_Kernel->Evaluate(x);
x -= 1.0;
}
}
for ( k = 0; k < m_NumberOfWeights; k++ )
{
weights[k] = 1.0;
for ( j = 0; j < SpaceDimension; j++ )
{
weights[k] *= weights1D[j][m_OffsetToIndexTable[k][j]];
}
}
}
} // end namespace itk
#endif
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