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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkGaussianKernelFunction.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:36 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef _itkGaussianKernelFunction_h |
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DEF |
#define _itkGaussianKernelFunction_h |
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#include "itkKernelFunction.h" |
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#include "vnl/vnl_math.h" |
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#include <math.h> |
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namespace itk |
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{ |
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/** \class GaussianKernelFunction |
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* \brief Gaussian kernel used for density estimation and nonparameteric |
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* regression. |
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* |
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* This class encapsulates a Gaussian smoothing kernel for |
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* density estimation or nonparameteric regression. |
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* See documentation for KernelFunction for more details. |
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* |
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* \sa KernelFunction |
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* |
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* \ingroup Functions |
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*/ |
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class ITKCommon_EXPORT GaussianKernelFunction : public KernelFunction |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef GaussianKernelFunction Self; |
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TDA |
typedef KernelFunction Superclass; |
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TDA |
typedef SmartPointer<Self> Pointer; |
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/** Method for creation through the object factory. */ |
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itkNewMacro(Self); |
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/** Run-time type information (and related methods). */ |
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itkTypeMacro(GaussianKernelFunction, KernelFunction); |
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/** Evaluate the function. */ |
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inline double Evaluate (const double& u) const |
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{ return ( exp( -0.5 * vnl_math_sqr( u ) ) * m_Factor ); } |
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protected: |
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GaussianKernelFunction(); |
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~GaussianKernelFunction(); |
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void PrintSelf(std::ostream& os, Indent indent) const |
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{ Superclass::PrintSelf( os, indent ); } |
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private: |
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GaussianKernelFunction(const Self&); //purposely not implemented |
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void operator=(const Self&); //purposely not implemented |
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static const double m_Factor; |
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}; |
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} // namespace itk |
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#endif |
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