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itkSigmoidImageFilter.h

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00001 /*========================================================================= 00002 00003 Program: Insight Segmentation & Registration Toolkit 00004 Module: $RCSfile: itkSigmoidImageFilter.h,v $ 00005 Language: C++ 00006 Date: $Date: 2003/09/10 14:28:56 $ 00007 Version: $Revision: 1.9 $ 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 __itkSigmoidImageFilter_h 00018 #define __itkSigmoidImageFilter_h 00019 00020 #include "itkUnaryFunctorImageFilter.h" 00021 00022 namespace itk 00023 { 00024 00042 namespace Function { 00043 template< class TInput, class TOutput> 00044 class Sigmoid 00045 { 00046 public: 00047 Sigmoid() { 00048 m_Alpha = 1.0; 00049 m_Beta = 0.0; 00050 m_OutputMinimum = NumericTraits< TOutput >::min(); 00051 m_OutputMaximum = NumericTraits< TOutput >::max(); 00052 } 00053 ~Sigmoid() {}; 00054 inline TOutput operator()( const TInput & A ) 00055 { 00056 const double x = ( static_cast<double>(A) - m_Beta ) / m_Alpha; 00057 const double e = 1.0 / ( 1.0 + exp( - x ) ); 00058 const double v = 00059 (m_OutputMaximum - m_OutputMinimum ) * e + m_OutputMinimum; 00060 return static_cast<TOutput>( v ); 00061 } 00062 void SetAlpha( double alpha ) { 00063 m_Alpha = alpha; 00064 } 00065 void SetBeta( double beta ) { 00066 m_Beta = beta; 00067 } 00068 double GetAlpha() const { 00069 return m_Alpha; 00070 } 00071 double GetBeta() const { 00072 return m_Beta; 00073 } 00074 void SetOutputMinimum( TOutput min ) { 00075 m_OutputMinimum = min; 00076 } 00077 void SetOutputMaximum( TOutput max ) { 00078 m_OutputMaximum = max; 00079 } 00080 TOutput GetOutputMinimum() const { 00081 return m_OutputMinimum; 00082 } 00083 TOutput GetOutputMaximum() const { 00084 return m_OutputMaximum; 00085 } 00086 00087 private: 00088 double m_Alpha; 00089 double m_Beta; 00090 TOutput m_OutputMinimum; 00091 TOutput m_OutputMaximum; 00092 }; 00093 } 00094 00095 00096 template <class TInputImage, class TOutputImage> 00097 class ITK_EXPORT SigmoidImageFilter : 00098 public 00099 UnaryFunctorImageFilter<TInputImage,TOutputImage, 00100 Function::Sigmoid< 00101 typename TInputImage::PixelType, 00102 typename TOutputImage::PixelType> > 00103 { 00104 public: 00106 typedef SigmoidImageFilter Self; 00107 typedef UnaryFunctorImageFilter<TInputImage,TOutputImage, 00108 Function::Sigmoid< typename TInputImage::PixelType, 00109 typename TOutputImage::PixelType> > Superclass; 00110 typedef SmartPointer<Self> Pointer; 00111 typedef SmartPointer<const Self> ConstPointer; 00112 00113 typedef typename TOutputImage::PixelType OutputPixelType; 00114 00116 itkNewMacro(Self); 00117 00118 void SetAlpha( double alpha ) 00119 { 00120 if( alpha == this->GetFunctor().GetAlpha() ) 00121 { 00122 return; 00123 } 00124 this->GetFunctor().SetAlpha( alpha ); 00125 this->Modified(); 00126 } 00127 00128 void SetBeta( double beta ) 00129 { 00130 if( beta == this->GetFunctor().GetBeta() ) 00131 { 00132 return; 00133 } 00134 this->GetFunctor().SetBeta( beta ); 00135 this->Modified(); 00136 } 00137 00138 void SetOutputMinimum( OutputPixelType min ) 00139 { 00140 if( min == this->GetFunctor().GetOutputMinimum() ) 00141 { 00142 return; 00143 } 00144 this->GetFunctor().SetOutputMinimum( min ); 00145 this->Modified(); 00146 } 00147 00148 void SetOutputMaximum( OutputPixelType max ) 00149 { 00150 if( max == this->GetFunctor().GetOutputMaximum() ) 00151 { 00152 return; 00153 } 00154 this->GetFunctor().SetOutputMaximum( max ); 00155 this->Modified(); 00156 } 00157 00158 protected: 00159 SigmoidImageFilter() {} 00160 virtual ~SigmoidImageFilter() {} 00161 00162 private: 00163 SigmoidImageFilter(const Self&); //purposely not implemented 00164 void operator=(const Self&); //purposely not implemented 00165 00166 }; 00167 00168 } // end namespace itk 00169 00170 00171 #endif

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