/usr/include/InsightToolkit/Common/itkDerivativeOperator.txx is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkDerivativeOperator.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 __itkDerivativeOperator_txx
#define __itkDerivativeOperator_txx
#include "itkDerivativeOperator.h"
#include "itkNumericTraits.h"
namespace itk
{
template <class TPixel, unsigned int VDimension, class 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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