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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDerivativeOperator.h,v $
Language: C++
Date: $Date: 2008-01-20 18:00:40 $
Version: $Revision: 1.21 $
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 __itkDerivativeOperator_h
#define __itkDerivativeOperator_h
#include "itkExceptionObject.h"
#include "itkNeighborhoodOperator.h"
namespace itk {
/**
* \class DerivativeOperator
* \brief A NeighborhoodOperator for taking an n-th order derivative
* at a pixel
*
* DerivativeOperator's coefficients are a tightest-fitting convolution
* kernel for calculating the n-th order directional derivative at a pixel.
* DerivativeOperator is a directional NeighborhoodOperator that should be
* applied to a Neighborhood or NeighborhoodPointer using the inner product
* method.
*
* \sa NeighborhoodOperator
* \sa Neighborhood
* \sa ForwardDifferenceOperator
* \sa BackwardDifferenceOperator
*
* \ingroup Operators
*/
template<class TPixel, unsigned int VDimension=2,
class TAllocator = NeighborhoodAllocator<TPixel> >
class ITK_EXPORT DerivativeOperator
: public NeighborhoodOperator<TPixel, VDimension, TAllocator>
{
public:
/** Standard class typedefs. */
typedef DerivativeOperator Self;
typedef NeighborhoodOperator<TPixel, VDimension, TAllocator> Superclass;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::PixelRealType PixelRealType;
/** Constructor. */
DerivativeOperator() : m_Order(1) {}
/** Copy constructor. */
DerivativeOperator(const Self& other)
: NeighborhoodOperator<TPixel, VDimension, TAllocator>(other)
{ m_Order = other.m_Order; }
/** Assignment operator */
Self &operator=(const Self& other)
{
Superclass::operator=(other);
m_Order = other.m_Order;
return *this;
}
/** Sets the order of the derivative. */
void SetOrder(const unsigned int &order)
{ m_Order = order; }
/** Returns the order of the derivative. */
unsigned int GetOrder() const { return m_Order; }
/** Prints some debugging information */
virtual void PrintSelf(std::ostream &os, Indent i) const
{
os << i << "DerivativeOperator { this=" << this
<< ", m_Order = " << m_Order << "}" << 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;
/** Calculates operator coefficients. */
CoefficientVector GenerateCoefficients();
/** Arranges coefficients spatially in the memory buffer. */
void Fill(const CoefficientVector &coeff)
{ Superclass::FillCenteredDirectional(coeff); }
private:
/** Order of the derivative. */
unsigned int m_Order;
};
} // namespace itk
// Define instantiation macro for this template.
#define ITK_TEMPLATE_DerivativeOperator(_, EXPORT, x, y) namespace itk { \
_(2(class EXPORT DerivativeOperator< ITK_TEMPLATE_2 x >)) \
namespace Templates { typedef DerivativeOperator< ITK_TEMPLATE_2 x > \
DerivativeOperator##y; } \
}
#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkDerivativeOperator+-.h"
#endif
#if ITK_TEMPLATE_TXX
# include "itkDerivativeOperator.txx"
#endif
#endif
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