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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkForwardDifferenceOperator.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 __itkForwardDifferenceOperator_h
#define __itkForwardDifferenceOperator_h
#include "itkNeighborhoodOperator.h"
#include "itkExceptionObject.h"
namespace itk {
/**
* \class ForwardDifferenceOperator
* \brief Operator whose inner product with a neighborhood returns
* a "half" derivative at the center of the neighborhood.
*
* ForwardDifferenceOperator uses forward differences
* i.e. F(x+1) - F(x) to calculate a "half" derivative useful, among
* other things, in solving differential equations. It is a directional
* NeighborhoodOperator that should be applied to a Neighborhood using the
* inner product.
*
* \ingroup Operators
*/
template<class TPixel, unsigned int VDimension=2,
class TAllocator = NeighborhoodAllocator<TPixel> >
class ITK_EXPORT ForwardDifferenceOperator
: public NeighborhoodOperator<TPixel, VDimension, TAllocator>
{
public:
/** Standard class typedefs. */
typedef ForwardDifferenceOperator Self;
typedef NeighborhoodOperator<TPixel, VDimension, TAllocator> Superclass;
typedef typename Superclass::PixelType PixelType;
/** Constructor. */
ForwardDifferenceOperator() {}
/** Copy constructor */
ForwardDifferenceOperator(const Self& other)
: NeighborhoodOperator<TPixel, VDimension, TAllocator>(other) { }
/** Assignment operator */
Self &operator=(const Self& other)
{
Superclass::operator=(other);
return *this;
}
protected:
/** Necessary to work around VC++ compiler bug. */
typedef typename Superclass::CoefficientVector CoefficientVector;
/** Calculates operator coefficients. */
CoefficientVector GenerateCoefficients();
/** Arranges coefficients spatially in the memory buffer. */
void Fill(const CoefficientVector &coeff)
{ this->FillCenteredDirectional(coeff); }
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkForwardDifferenceOperator.txx"
#endif
#endif
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