/usr/include/ITK-4.5/itkDerivativeOperator.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 __itkDerivativeOperator_hxx
#define __itkDerivativeOperator_hxx
#include "itkDerivativeOperator.h"
#include "itkNumericTraits.h"
namespace itk
{
template< typename TPixel, unsigned int VDimension, typename TAllocator >
typename DerivativeOperator< TPixel, VDimension, TAllocator >
::CoefficientVector
DerivativeOperator< TPixel, VDimension, TAllocator >
::GenerateCoefficients()
{
unsigned int i;
unsigned int j;
PixelRealType previous;
PixelRealType next;
const unsigned int w = 2 * ( ( m_Order + 1 ) / 2 ) + 1;
CoefficientVector coeff(w);
coeff[w / 2] = 1.0;
for ( i = 0; i < m_Order / 2; i++ )
{
previous = coeff[1] - 2 * coeff[0];
for ( j = 1; j < w - 1; j++ )
{
next = coeff[j - 1] + coeff[j + 1] - 2 * coeff[j];
coeff[j - 1] = previous;
previous = next;
}
next = coeff[j - 1] - 2 * coeff[j];
coeff[j - 1] = previous;
coeff[j] = next;
}
for ( i = 0; i < m_Order % 2; i++ )
{
previous = 0.5 * coeff[1];
for ( j = 1; j < w - 1; j++ )
{
next = -0.5 * coeff[j - 1] + 0.5 * coeff[j + 1];
coeff[j - 1] = previous;
previous = next;
}
next = -0.5 * coeff[j - 1];
coeff[j - 1] = previous;
coeff[j] = next;
}
return coeff;
}
} // namespace itk
#endif
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