/usr/include/InsightToolkit/Common/itkBSplineInterpolationWeightFunction.txx is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | /*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkBSplineInterpolationWeightFunction.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkBSplineInterpolationWeightFunction_txx
#define __itkBSplineInterpolationWeightFunction_txx
#include "itkBSplineInterpolationWeightFunction.h"
#include "itkImage.h"
#include "itkMatrix.h"
#include "itkMath.h"
#include "itkImageRegionConstIteratorWithIndex.h"
namespace itk
{
/** Constructor */
template <class TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder>
BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension, VSplineOrder>
::BSplineInterpolationWeightFunction()
{
// Initialize the number of weights;
m_NumberOfWeights =
static_cast<unsigned long>( 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 long 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 <class 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 continous index position */
template <class 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 continous index position */
template <class TCoordRep, unsigned int VSpaceDimension,
unsigned int VSplineOrder>
void BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension,
VSplineOrder>
::Evaluate(
const ContinuousIndexType & index,
WeightsType & weights,
IndexType & startIndex ) const
{
typedef typename IndexType::IndexValueType IndexValueType;
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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