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itkAtanRegularizedHeavisideStepFunction.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkAtanRegularizedHeavisideStepFunction.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-05-09 21:12:23 $
00007   Version:   $Revision: 1.2 $
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 
00018 #ifndef __itkAtanRegularizedHeavisideStepFunction_h
00019 #define __itkAtanRegularizedHeavisideStepFunction_h
00020 
00021 #include "itkRegularizedHeavisideStepFunction.h"
00022 
00023 namespace itk
00024 {
00025 
00052 template< class TInput = float, class TOutput = double >
00053 class AtanRegularizedHeavisideStepFunction : 
00054  public RegularizedHeavisideStepFunction< TInput, TOutput >
00055 {
00056 public:
00057   typedef AtanRegularizedHeavisideStepFunction                  Self;
00058   typedef RegularizedHeavisideStepFunction< TInput, TOutput >   Superclass;
00059   typedef SmartPointer<Self>                                    Pointer;
00060   typedef SmartPointer<const Self>                              ConstPointer;
00061 
00062   itkNewMacro( Self );
00063  
00064   itkTypeMacro( AtanRegularizedHeavisideStepFunction, RegularizedHeavisideStepFunction );
00065 
00066   typedef typename Superclass::InputType                        InputType;
00067   typedef typename Superclass::OutputType                       OutputType;
00068   typedef typename Superclass::RealType                         RealType;
00069 
00071   virtual OutputType Evaluate( const InputType& input ) const
00072     {
00073     return 0.5 + ( vnl_math::one_over_pi * vcl_atan( input * this->GetOneOverEpsilon() ) );
00074     }
00075 
00077   virtual OutputType EvaluateDerivative( const InputType& input ) const
00078     {
00079     const RealType t = ( input * this->GetOneOverEpsilon() );
00080     return static_cast< OutputType>( vnl_math::one_over_pi / (1.0 + t * t ) );
00081     }
00083 
00084 protected:
00085   AtanRegularizedHeavisideStepFunction() {}
00086   virtual ~AtanRegularizedHeavisideStepFunction() {}
00087 
00088 private:
00089   AtanRegularizedHeavisideStepFunction(const Self& ); //purposely not implemented
00090   void operator=(const Self& ); //purposely not implemented
00091 
00092 };
00093 
00094 }
00095 
00096 #endif
00097 

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