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itkCompositeValleyFunction.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkCompositeValleyFunction.h,v $
00005   Language:  C++
00006   Date:      $Date: 2007/03/22 14:29:13 $
00007   Version:   $Revision: 1.10 $
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 __itkCompositeValleyFunction_h
00018 #define __itkCompositeValleyFunction_h
00019 
00020 #include "itkArray.h"
00021 #include "itkCacheableScalarFunction.h"
00022 #include <vector>
00023 
00024 namespace itk {
00025 
00071 class TargetClass
00072 {
00073 public:
00075   TargetClass(double mean, double sigma) 
00076     { 
00077     m_Mean = mean;
00078     m_Sigma = sigma;
00079     }
00080 
00082   void SetMean(double mean) { m_Mean = mean; }  
00083   double GetMean() { return m_Mean; } 
00085 
00087   void SetSigma(double sigma) { m_Sigma = sigma; }
00088   double GetSigma() { return m_Sigma; }
00090 
00091 private:
00092   double m_Mean;
00093   double m_Sigma;
00094 }; // end of class 
00095 
00096 class CompositeValleyFunction : public CacheableScalarFunction
00097 {
00098 public:
00099 
00101   typedef CacheableScalarFunction Superclass;
00102 
00104   typedef  Superclass::MeasureType          MeasureType;
00105   typedef  Superclass::MeasureArrayType     MeasureArrayType;
00106 
00108   CompositeValleyFunction( const MeasureArrayType & classMeans, 
00109                            const MeasureArrayType & classSigmas );
00110 
00112   virtual ~CompositeValleyFunction() {}
00113 
00115   double GetUpperBound() { return m_UpperBound; }
00116 
00118   double GetLowerBound() { return m_LowerBound; }
00119 
00122   MeasureType operator() (MeasureType x)
00123     {
00124     if (x > m_UpperBound || x < m_LowerBound)
00125       {
00126       return 1;
00127       }
00128 
00129     if (!this->IsCacheAvailable()) 
00130       {
00131       return this->Evaluate(x);
00132       } 
00133     else 
00134       {
00135       return GetCachedValue(x);
00136       }
00137     }
00138 
00140   inline MeasureType Evaluate(MeasureType x) 
00141     {
00142     MeasureType res = 1;
00143 
00144     for (unsigned int k = 0; k < m_Targets.size(); k++)
00145       {
00146       res *= valley( ( x - m_Targets[k].GetMean() ) /
00147                      m_Targets[k].GetSigma() );
00148       }
00149     
00150     return res;
00151     }   
00152 
00154   inline MeasureType valley(MeasureType d) 
00155     {
00156     return 1 - 1 / (1+d*d/3);
00157     }
00158 
00159 protected:
00160   void AddNewClass(double mean, double sigma)
00161   {
00162     TargetClass aClass(mean, sigma);
00163     m_Targets.push_back(aClass);
00164   }
00165 
00167   void Initialize();
00168 
00169 private:
00171   std::vector<TargetClass> m_Targets;  
00172 
00175   double m_UpperBound;
00176 
00179   double m_LowerBound;
00180 
00181 }; // end of class
00182 
00183 } // end of namespace itk
00184 #endif
00185 

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