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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBSplineDerivativeKernelFunction.h,v $
Language: C++
Date: $Date: 2007-01-25 23:18:05 $
Version: $Revision: 1.6 $
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 __itkBSplineDerivativeKernelFunction_h
#define __itkBSplineDerivativeKernelFunction_h
#include "itkKernelFunction.h"
#include "itkBSplineKernelFunction.h"
namespace itk
{
/** \class BSplineDerivativeKernelFunction
* \brief Derivative of a BSpline kernel used for density estimation and
* nonparameteric regression.
*
* This class enscapsulates the derivative of a BSpline kernel for
* density estimation or nonparameteric regression.
* See documentation for KernelFunction for more details.
*
* This class is templated over the spline order.
* \warning Evaluate is only implemented for spline order 1 to 4
*
* \sa KernelFunction
*
* \ingroup Functions
*/
template <unsigned int VSplineOrder = 3>
class ITK_EXPORT BSplineDerivativeKernelFunction : public KernelFunction
{
public:
/** Standard class typedefs. */
typedef BSplineDerivativeKernelFunction Self;
typedef KernelFunction Superclass;
typedef SmartPointer<Self> Pointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(BSplineDerivativeKernelFunction, KernelFunction);
/** Enum of for spline order. */
itkStaticConstMacro(SplineOrder, unsigned int, VSplineOrder);
/** Evaluate the function. */
inline double Evaluate( const double & u ) const
{
return ( m_KernelFunction->Evaluate( u + 0.5 ) -
m_KernelFunction->Evaluate( u - 0.5 ) );
}
protected:
typedef BSplineKernelFunction<itkGetStaticConstMacro(SplineOrder) - 1>
KernelType;
BSplineDerivativeKernelFunction()
{
m_KernelFunction = KernelType::New();
}
~BSplineDerivativeKernelFunction(){};
void PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf( os, indent );
os << indent << "Spline Order: " << SplineOrder << std::endl;
}
private:
BSplineDerivativeKernelFunction(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
typename KernelType::Pointer m_KernelFunction;
};
} // end namespace itk
#endif
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