/usr/include/InsightToolkit/Common/itkLaplacianOperator.h is in libinsighttoolkit3-dev 3.20.1-1.
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Program: Insight Segmentation & Registration Toolkit
Module: itkLaplacianOperator.h
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 __itkLaplacianOperator_h
#define __itkLaplacianOperator_h
#include "itkExceptionObject.h"
#include "itkNeighborhoodOperator.h"
namespace itk {
/**
* \class LaplacianOperator
*
* 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 */
template<class TPixel, unsigned int VDimension=2,
class TAllocator = NeighborhoodAllocator<TPixel> >
class ITK_EXPORT 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
// Define instantiation macro for this template.
#define ITK_TEMPLATE_LaplacianOperator(_, EXPORT, x, y) namespace itk { \
_(2(class EXPORT LaplacianOperator< ITK_TEMPLATE_2 x >)) \
namespace Templates { typedef LaplacianOperator< ITK_TEMPLATE_2 x > \
LaplacianOperator##y; } \
}
#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkLaplacianOperator+-.h"
#endif
#if ITK_TEMPLATE_TXX
# include "itkLaplacianOperator.txx"
#endif
#endif
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