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itkGaussianKernelFunction.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkGaussianKernelFunction.h,v $
00005   Language:  C++
00006   Date:      $Date: 2002/01/15 18:56:37 $
00007   Version:   $Revision: 1.3 $
00008 
00009   Copyright (c) 2002 Insight Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even 
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 #ifndef _itkGaussianKernelFunction_h
00018 #define _itkGaussianKernelFunction_h
00019 
00020 #include "itkKernelFunction.h"
00021 #include "vnl/vnl_math.h"
00022 
00023 namespace itk
00024 {
00025 
00038 class ITK_EXPORT GaussianKernelFunction : public KernelFunction
00039 {
00040 public:
00042   typedef GaussianKernelFunction Self;
00043   typedef KernelFunction Superclass;
00044   typedef SmartPointer<Self>  Pointer;
00045 
00047   itkNewMacro(Self); 
00048 
00050   itkTypeMacro(GaussianKernelFunction, KernelFunction); 
00051 
00053   inline double Evaluate (const double& u) const
00054     { return ( exp( -0.5 * vnl_math_sqr( u ) ) * m_Factor ); }
00055 
00056 protected:
00057   GaussianKernelFunction(){};
00058   ~GaussianKernelFunction(){};
00059   void PrintSelf(std::ostream& os, Indent indent) const
00060     { Superclass::PrintSelf( os, indent ); }  
00061 
00062 private:
00063   GaussianKernelFunction(const Self&); //purposely not implemented
00064   void operator=(const Self&); //purposely not implemented
00065 
00066   static const double m_Factor;
00067 
00068 };
00069 
00070 } // namespace itk
00071 
00072 #endif

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