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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 itkBackwardDifferenceOperator_h
#define itkBackwardDifferenceOperator_h
#include "itkNeighborhoodOperator.h"
namespace itk
{
/**
* \class BackwardDifferenceOperator
* \brief Operator whose inner product with a neighborhood returns
* a "half" derivative at the center of the neighborhood.
*
* BackwardDifferenceOperator uses backward differences
* i.e. F(x) - F(x-1) 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
*
* \ingroup ITKCommon
*
* \wiki
* \wikiexample{Operators/BackwardDifferenceOperator,Create a backward difference kernel}
* \endwiki
*/
template< typename TPixel, unsigned int TDimension = 2,
typename TAllocator = NeighborhoodAllocator< TPixel > >
class ITK_TEMPLATE_EXPORT BackwardDifferenceOperator:
public NeighborhoodOperator< TPixel, TDimension, TAllocator >
{
public:
/** Standard class typedefs. */
typedef BackwardDifferenceOperator Self;
typedef NeighborhoodOperator< TPixel, TDimension, TAllocator > Superclass;
/** From Superclass */
typedef typename Superclass::PixelType PixelType;
/** Constructor. */
BackwardDifferenceOperator() {}
protected:
/** Necessary to work around a compiler bug in VC++. */
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); }
private:
ITK_DISALLOW_COPY_AND_ASSIGN(BackwardDifferenceOperator);
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBackwardDifferenceOperator.hxx"
#endif
#endif
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