/usr/include/ITK-4.5/itkSobelOperator.h 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 __itkSobelOperator_h
#define __itkSobelOperator_h
#include "itkNeighborhoodOperator.h"
namespace itk
{
/**
* \class SobelOperator
*
* \brief A NeighborhoodOperator for performing a directional Sobel
* edge-detection operation at a pixel location.
*
* SobelOperator is a directional NeighborhoodOperator that should be
* applied a NeighborhoodIterator using the NeighborhoodInnerProduct
* method. To create the operator:
*
* 1) Set the direction by calling \code SetDirection \endcode
* 2) call
* \code
* itk::Size<2> radius;
* radius.Fill(1);
* sobelOperator.CreateToRadius(radius);
* \endcode
* 3) You may optionally scale the coefficients of this operator using the
* \code ScaleCoefficients \endcode method. This is useful if you
* want to take the spacing of the image into account when computing
* the edge strength. Apply the scaling only after calling to
* \code CreateToRadius \endcode.
*
* The Sobel Operator in vertical direction for 2 dimensions is
* \verbatim
* -1 -2 -1
* 0 0 0
* 1 2 1
*
* \endverbatim
* The Sobel Operator in horizonal direction is for 2 dimensions is
* \verbatim
* -1 0 1
* -2 0 2
* -1 0 1
* \endverbatim
*
* The current implementation of the Sobel operator is for 2 and 3 dimensions only.
* The ND version is planned for future releases.
*
* The extension to 3D is from the publication
* "Irwin Sobel. An Isotropic 3x3x3 Volume Gradient Operator.
* Technical report, Hewlett-Packard Laboratories, April 1995."
*
* The Sobel operator in 3D has the kernel
*
* \verbatim
* -1 -3 -1 0 0 0 1 3 1
* -3 -6 -3 0 0 0 3 6 3
* -1 -3 -1 0 0 0 1 3 1
*
* x-1 x x+1
* \endverbatim
*
* The \c x kernel is just rotated as required to obtain the kernel in the
* \c y and \c z directions.
*
* \sa NeighborhoodOperator
* \sa Neighborhood
* \sa ForwardDifferenceOperator
* \sa BackwardDifferenceOperator
*
* \ingroup Operators
* \ingroup ITKCommon
*
* \wiki
* \wikiexample{Operators/SobelOperator,Create the Sobel kernel}
* \endwiki
*/
template< typename TPixel, unsigned int VDimension = 2,
typename TAllocator = NeighborhoodAllocator< TPixel > >
class SobelOperator:
public NeighborhoodOperator< TPixel, VDimension, TAllocator >
{
public:
/** Standard typedefs */
typedef SobelOperator Self;
typedef NeighborhoodOperator< TPixel, VDimension, TAllocator > Superclass;
itkTypeMacro(SobelOperator, NeighborhoodOperator);
SobelOperator() {}
SobelOperator(const Self & other):
NeighborhoodOperator< TPixel, VDimension, TAllocator >(other)
{}
/** Creates the operator with length only in the specified direction. For
* the Sobel operator, this
* The radius of the operator will be 0 except along the axis on which
* the operator will work.
* \sa CreateToRadius \sa FillCenteredDirectional \sa SetDirection() \sa GetDirection() */
virtual void CreateDirectional()
{
this->CreateToRadius(1);
}
/** Creates the operator with a specified radius ("square", same length
* on each side). The spatial location of the coefficients within the
* operator is defined by the subclass implementation of the Fill method.
* \sa CreateDirectional \sa Fill */
// virtual void CreateToRadius(const unsigned long);
/**
* Assignment operator
*/
Self & operator=(const Self & other)
{
Superclass::operator=(other);
return *this;
}
/**
* Prints some debugging information
*/
virtual void PrintSelf(std::ostream & os, Indent i) const
{
os << i << "SobelOperator { this=" << this << "}" << std::endl;
Superclass::PrintSelf( os, i.GetNextIndent() );
}
protected:
/**
* Typedef support for coefficient vector type. Necessary to
* work around compiler bug on VC++.
*/
typedef typename Superclass::CoefficientVector CoefficientVector;
typedef typename Superclass::PixelType PixelType;
/**
* Calculates operator coefficients.
*/
CoefficientVector GenerateCoefficients();
/**
* Arranges coefficients spatially in the memory buffer.
*/
void Fill(const CoefficientVector & c);
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSobelOperator.hxx"
#endif
#endif
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