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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: 2003/09/10 14:29:09 $ 00007 Version: $Revision: 1.6 $ 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 00023 namespace itk 00024 { 00025 00038 class ITKCommon_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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