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itkMaximumRatioDecisionRule.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkMaximumRatioDecisionRule.h,v $
00005   Language:  C++
00006   Date:      $Date: 2003/09/10 14:29:15 $
00007   Version:   $Revision: 1.7 $
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 __MaximumRatioDecisionRule_h
00018 #define __MaximumRatioDecisionRule_h
00019 
00020 #include "itkWin32Header.h"
00021 
00022 #include <vector>
00023 #include "vnl/vnl_matrix.h"
00024 
00025 #include "itkNumericTraits.h"
00026 #include "itkDecisionRuleBase.h"
00027 
00028 namespace itk {
00029 
00044 class ITKCommon_EXPORT MaximumRatioDecisionRule : 
00045     public DecisionRuleBase
00046 {
00047 public:
00049   typedef MaximumRatioDecisionRule Self ;
00050   typedef DecisionRuleBase Superclass;
00051   typedef SmartPointer<Self> Pointer;
00052   
00054   itkTypeMacro(MaximumRatioDecisionRule, DecisionRuleBase);
00055   
00057   itkNewMacro(Self) ;
00058   
00059   typedef float APrioriValueType ;
00060   typedef std::vector< APrioriValueType > APrioriVectorType ;
00061 
00062   unsigned int Evaluate(std::vector< double > &discriminantScores) ;
00063 
00065   void SetAPriori(APrioriVectorType& values) ;
00066 
00067 protected:
00068   MaximumRatioDecisionRule() ;
00069   virtual ~MaximumRatioDecisionRule() {}
00070   
00071 private:
00073   unsigned int m_NumberOfClasses ;
00074 
00076   vnl_matrix< double > m_APrioriRatioMatrix ;
00077 } ; // end of class
00078 
00079 inline unsigned int 
00080 MaximumRatioDecisionRule::Evaluate(std::vector< double > 
00081                                    &discriminantScores)
00082 {
00083   unsigned int i, j ;
00084   double temp ;
00085 
00086   for (i = 0 ; i < m_NumberOfClasses ; i++)
00087     {
00088     j = 0 ;
00089     while ( j < m_NumberOfClasses )
00090       {
00091       if ( j != i )
00092         {
00093         if ( discriminantScores[j] != 0.0 )
00094           {
00095           temp = discriminantScores[i] / discriminantScores[j] ;
00096           }
00097         else
00098           {
00099           temp = NumericTraits< double >::max() ;
00100           }
00101 
00102         if ( temp < m_APrioriRatioMatrix.get(i,j) )
00103           {
00104           break ;
00105           }
00106         }
00107 
00108       ++j ;
00109 
00110       if ( j == m_NumberOfClasses )
00111         {
00112         return i ;
00113         }
00114       }
00115     }
00116 
00117   return i ;
00118 }
00119 
00120 } // end of namespace
00121 #endif
00122 
00123 
00124 
00125 
00126 
00127 
00128 

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