/usr/include/ITK-4.9/itkSobelOperator.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 itkSobelOperator_hxx
#define itkSobelOperator_hxx
#include "itkSobelOperator.h"
#include "itkObject.h"
namespace itk
{
template< typename TPixel, unsigned int VDimension, typename TAllocator >
void
SobelOperator< TPixel, VDimension, TAllocator >
::Fill(const CoefficientVector & coeff)
{
this->InitializeToZero();
// Note that this code is only good for 2d and 3d operators. Places the
// coefficients in the exact center of the neighborhood
unsigned int i;
int x, y, z, pos;
unsigned int center = this->GetCenterNeighborhoodIndex();
if ( VDimension == 3 )
{
i = 0;
for ( z = -1; z <= 1; z++ )
{
for ( y = -1; y <= 1; y++ )
{
for ( x = -1; x <= 1; x++ )
{
pos = center + z *this->GetStride(2) + y *this->GetStride(1)
+ x *this->GetStride(0);
this->operator[](pos) = static_cast< TPixel >( coeff[i] );
i++;
}
}
}
}
else if ( VDimension == 2 )
{
i = 0;
for ( y = -1; y <= 1; y++ )
{
for ( x = -1; x <= 1; x++ )
{
pos = center + y *this->GetStride(1) + x *this->GetStride(0);
this->operator[](pos) = static_cast< TPixel >( coeff[i] );
i++;
}
}
}
else
{
itkExceptionMacro(
<<
"The ND version of the Sobel operator is not yet implemented. Currently only the 2D and 3D versions are available.");
}
}
template< typename TPixel, unsigned int VDimension, typename TAllocator >
typename SobelOperator< TPixel, VDimension, TAllocator >
::CoefficientVector
SobelOperator< TPixel, VDimension, TAllocator >
::GenerateCoefficients()
{
std::vector< double > coeff;
if ( VDimension == 2 && this->GetDirection() == 0 )
{
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
coeff.push_back(-2.0); coeff.push_back(0.0); coeff.push_back(2);
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
}
else if ( VDimension == 2 && this->GetDirection() == 1 )
{
coeff.push_back(-1.0); coeff.push_back(-2); coeff.push_back(-1.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(1.0); coeff.push_back(2); coeff.push_back(1.0);
}
else if ( VDimension == 3 && this->GetDirection() == 0 )
{
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
coeff.push_back(-3.0); coeff.push_back(0.0); coeff.push_back(3.0);
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
coeff.push_back(-3.0); coeff.push_back(0.0); coeff.push_back(3.0);
coeff.push_back(-6.0); coeff.push_back(0.0); coeff.push_back(6.0);
coeff.push_back(-3.0); coeff.push_back(0.0); coeff.push_back(3.0);
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
coeff.push_back(-3.0); coeff.push_back(0.0); coeff.push_back(3.0);
coeff.push_back(-1.0); coeff.push_back(0.0); coeff.push_back(1.0);
}
else if ( VDimension == 3 && this->GetDirection() == 1 )
{
coeff.push_back(-1.0); coeff.push_back(-3.0); coeff.push_back(-1.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(1.0); coeff.push_back(3.0); coeff.push_back(1.0);
coeff.push_back(-3.0); coeff.push_back(-6.0); coeff.push_back(-3.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(3.0); coeff.push_back(6.0); coeff.push_back(3.0);
coeff.push_back(-1.0); coeff.push_back(-3.0); coeff.push_back(-1.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(1.0); coeff.push_back(3.0); coeff.push_back(1.0);
}
else if ( VDimension == 3 && this->GetDirection() == 2 )
{
coeff.push_back(-1.0); coeff.push_back(-3.0); coeff.push_back(-1.0);
coeff.push_back(-3.0); coeff.push_back(-6.0); coeff.push_back(-3.0);
coeff.push_back(-1.0); coeff.push_back(-3.0); coeff.push_back(-1.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(0.0); coeff.push_back(0.0); coeff.push_back(0.0);
coeff.push_back(1.0); coeff.push_back(3.0); coeff.push_back(1.0);
coeff.push_back(3.0); coeff.push_back(6.0); coeff.push_back(3.0);
coeff.push_back(1.0); coeff.push_back(3.0); coeff.push_back(1.0);
}
else
{
itkExceptionMacro(
<<
"The ND version of the Sobel operator has not been implemented. Currently only 2D and 3D versions are available.");
}
return coeff;
}
} // namespace itk
#endif
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