00001 /*========================================================================= 00002 00003 Program: Insight Segmentation & Registration Toolkit 00004 Module: $RCSfile: itkGaussianKernelFunction.h,v $ 00005 Language: C++ 00006 Date: $Date: 2008-10-17 01:08:45 $ 00007 Version: $Revision: 1.11 $ 00008 00009 Copyright (c) Insight Software 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 #include <math.h> 00023 00024 namespace itk 00025 { 00026 00039 class ITKCommon_EXPORT GaussianKernelFunction : public KernelFunction 00040 { 00041 public: 00043 typedef GaussianKernelFunction Self; 00044 typedef KernelFunction Superclass; 00045 typedef SmartPointer<Self> Pointer; 00046 00048 itkNewMacro(Self); 00049 00051 itkTypeMacro(GaussianKernelFunction, KernelFunction); 00052 00054 inline double Evaluate (const double& u) const 00055 { return ( vcl_exp(-0.5 * vnl_math_sqr( u ) ) * m_Factor ); } 00056 00057 protected: 00058 GaussianKernelFunction(); 00059 ~GaussianKernelFunction(); 00060 void PrintSelf(std::ostream& os, Indent indent) const 00061 { Superclass::PrintSelf( os, indent ); } 00062 00063 private: 00064 GaussianKernelFunction(const Self&); //purposely not implemented 00065 void operator=(const Self&); //purposely not implemented 00066 00067 static const double m_Factor; 00068 00069 }; 00070 00071 } // end namespace itk 00072 00073 #endif 00074