/usr/include/ITK-4.5/itkLaplacianOperator.h is in libinsighttoolkit4-dev 4.5.0-3.
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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 __itkLaplacianOperator_h
#define __itkLaplacianOperator_h
#include "itkNeighborhoodOperator.h"
namespace itk
{
/**
* \class LaplacianOperator
* \brief A NeighborhoodOperator for use in calculating the Laplacian at a pixel.
*
* A NeighborhoodOperator for use in calculating the Laplacian at a pixel.
* The LaplacianOperator's coefficients are a tightest-fitting convolution
* kernel.
*
* For example, the simplest Laplacian Operator for 2D has the form:
* \code
* 0 1 0
* 1 -4 1
* 0 1 0
* \endcode
*
* \par
* The LaplacianOperator is a non-directional NeighborhoodOperator that
* should be applied to a Neighborhood or NeighborhoodIterator using an inner
* product method (itkNeighborhoodInnerProduct). To initialize the operator, you
* need call CreateOperator() before using it.
*
* \par
* By default the operator will be created for an isotropic image, but you can
* modify the operator to handle different pixel spacings by calling
* SetDerivativeScalings. The argument to SetDerivativeScalings is an array
* of doubles that is of length VDimension (the dimensionality of the image).
* Make sure to use 1/pixel_spacing to properly scale derivatives.
*
* \sa NeighborhoodOperator
* \sa Neighborhood
* \ingroup Operators
* \ingroup ITKCommon
*
* \wiki
* \wikiexample{Operators/LaplacianOperator,Create a Laplacian kernel}
* \endwiki
*/
template< typename TPixel, unsigned int VDimension = 2,
typename TAllocator = NeighborhoodAllocator< TPixel > >
class LaplacianOperator:
public NeighborhoodOperator< TPixel, VDimension, TAllocator >
{
public:
/** Standard "Self" typedef support. */
typedef LaplacianOperator Self;
/** Standard "Superclass" typedef. */
typedef NeighborhoodOperator< TPixel, VDimension, TAllocator > Superclass;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::SizeType SizeType;
/** Default constructor */
LaplacianOperator()
{
for ( unsigned i = 0; i < VDimension; ++i )
{
m_DerivativeScalings[i] = 1.0;
}
}
/** Copy constructor */
LaplacianOperator(const Self & other):
NeighborhoodOperator< TPixel, VDimension, TAllocator >(other)
{
for ( unsigned i = 0; i < VDimension; ++i )
{
m_DerivativeScalings[i] = other.m_DerivativeScalings[i];
}
}
/** This function is called to create the operator */
void CreateOperator();
/** 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 << "LaplacianOperator { this=" << this
<< "}" << std::endl;
Superclass::PrintSelf( os, i.GetNextIndent() );
}
/** Sets the weights that are applied to the derivative in each axial
* direction when the kernel is computed. These weights are all 1.0 by
* default. This method must be called BEFORE CreateOperator */
void SetDerivativeScalings(const double *s);
protected:
/** Typedef support for coefficient vector type. Necessary to
* work around compiler bug on VC++. */
typedef typename Superclass::CoefficientVector CoefficientVector;
/** Calculates operator coefficients. */
CoefficientVector GenerateCoefficients();
/** Arranges coefficients spatially in the memory buffer, default
* function was NOT used. */
void Fill(const CoefficientVector &);
private:
/** Weights applied to derivatives in each axial direction */
double m_DerivativeScalings[VDimension];
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLaplacianOperator.hxx"
#endif
#endif
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