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Numerics/Statistics/itkMembershipSample.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkMembershipSample.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-03-04 15:24:02 $
00007   Version:   $Revision: 1.32 $
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 __itkMembershipSample_h
00018 #define __itkMembershipSample_h
00019 
00020 #include "itk_hash_map.h"
00021 #include "itkSample.h"
00022 #include "itkSubsample.h"
00023 
00024 #include "itkExceptionObject.h"
00025 
00026 namespace itk { 
00027 namespace Statistics {
00028 
00056 template< class TSample >
00057 class ITK_EXPORT MembershipSample : 
00058     public Sample< typename TSample::MeasurementVectorType >
00059 {
00060 public:
00062   typedef MembershipSample                                  Self;
00063   typedef Sample< typename TSample::MeasurementVectorType > Superclass;
00064   typedef SmartPointer< Self >                              Pointer;
00065   typedef SmartPointer< const Self >                        ConstPointer;
00066 
00068   itkTypeMacro(MembershipSample, Sample);
00069   itkNewMacro(Self);
00071 
00075   typedef typename TSample::MeasurementVectorType MeasurementVectorType;
00076   typedef typename TSample::MeasurementType       MeasurementType;
00077   typedef typename TSample::InstanceIdentifier    InstanceIdentifier;
00078   typedef typename TSample::FrequencyType         FrequencyType;
00079   typedef typename TSample::TotalFrequencyType    TotalFrequencyType;
00080 
00081   
00084   typedef std::vector< unsigned int > UniqueClassLabelsType;
00085 
00088   typedef itk::hash_map< InstanceIdentifier, unsigned int> ClassLabelHolderType;
00089 
00092   typedef Subsample< TSample >                      ClassSampleType;
00093   typedef typename ClassSampleType::Pointer         ClassSamplePointer;
00094   typedef typename ClassSampleType::ConstPointer    ClassSampleConstPointer;
00095 
00097   void SetSample(const TSample* sample);
00098 
00100   const TSample* GetSample() const;
00101 
00103   void SetNumberOfClasses(unsigned int numberOfClasses);
00104 
00106   unsigned int GetNumberOfClasses() const;
00107 
00112   void AddInstance(const unsigned int &classLabel, const InstanceIdentifier &id);
00113 
00116   unsigned int GetClassLabel(const InstanceIdentifier &id) const;
00117 
00120   int GetInternalClassLabel(const unsigned int classLabel ) const;
00121 
00124   unsigned int GetClassSampleSize(const unsigned int &classLabel) const;
00125 
00128   const ClassSampleType* GetClassSample(const unsigned int &classLabel) const;
00129 
00132   ClassLabelHolderType* GetClassLabels()
00133     { return &m_ClassLabelHolder; }
00134 
00136   unsigned int Size(void) const;
00137 
00140   const MeasurementVectorType & GetMeasurementVector(const InstanceIdentifier &id) const;
00141 
00144   MeasurementType GetMeasurement(const InstanceIdentifier &id, 
00145                                   const unsigned int &dimension);
00146 
00148   FrequencyType GetFrequency(const InstanceIdentifier &id) const;
00149 
00151   TotalFrequencyType GetTotalFrequency() const;
00152 
00153   void Resize(unsigned int n) 
00154     {
00155     m_ClassLabelHolder.resize(n);
00156     }
00157  
00158   class ConstIterator
00159     {
00160     public:
00161     ConstIterator(InstanceIdentifier id, const Self* membershipSample)
00162       :m_Id(id), m_MembershipSample(membershipSample),
00163        m_Sample(membershipSample->GetSample()) {}
00164     
00165     FrequencyType GetFrequency() const
00166       { return  m_Sample->GetFrequency(m_Id); }
00167     
00168     const MeasurementVectorType & GetMeasurementVector() const
00169       { return m_Sample->GetMeasurementVector(m_Id); } 
00170     
00171     InstanceIdentifier GetInstanceIdentifier() const
00172       { return m_Id; }
00173 
00174     void SetClassLabel(unsigned int classLabel)
00175       { m_MembershipSample->AddInstance(classLabel, m_Id); }
00176 
00177     unsigned int GetClassLabel() const
00178       { return m_MembershipSample->GetClassLabel(m_Id); }
00179 
00180     ConstIterator& operator++() 
00181       { 
00182       ++m_Id;
00183       return *this;
00184       }
00185     
00186     bool operator!=(const ConstIterator& it) 
00187       { 
00188       if (m_Id != it.m_Id || 
00189           m_MembershipSample != it.m_MembershipSample ||
00190           m_Sample != it.m_Sample)
00191         {
00192         return true;
00193         }
00194       else
00195         {
00196         return false;
00197         }
00198       }
00199 
00200     bool operator==(const ConstIterator& it) 
00201       { 
00202       if (m_Id == it.m_Id && 
00203           m_MembershipSample == it.m_MembershipSample &&
00204           m_Sample == it.m_Sample)
00205         {
00206         return true;
00207         }
00208       else
00209         {
00210         return false;
00211         }
00212       }
00213     
00214     ConstIterator& operator=(const ConstIterator& it)
00215       {
00216       m_Id = it.m_Id;
00217       m_MembershipSample = it.m_MembershipSample;
00218       m_Sample = it.m_Sample;
00219       return *this;
00220       }
00221 
00222     ConstIterator(const ConstIterator& it)
00223       {
00224       m_Id = it.m_Id;
00225       m_MembershipSample = it.m_MembershipSample;
00226       m_Sample = it.m_Sample;
00227       }
00228     
00229   private:
00230     // identifier for the instance
00231     InstanceIdentifier m_Id;  
00232     // Pointer to MemebershipSample object
00233     const Self* m_MembershipSample;
00234     const TSample* m_Sample;
00235   };
00236 
00237   ConstIterator Begin() const
00238     { 
00239     ConstIterator iter(0, this);
00240     return iter; 
00241     }
00242   
00243   ConstIterator  End() const
00244     {
00245     ConstIterator iter(this->Size(), this); 
00246     return iter; 
00247     }
00248  
00249 protected:
00250   MembershipSample();
00251   virtual ~MembershipSample() {}
00252   void PrintSelf(std::ostream& os, Indent indent) const;  
00253   
00254 private:
00255   MembershipSample(const Self&); //purposely not implemented
00256   void operator=(const Self&); //purposely not implemented
00257 
00258   const TSample*                    m_Sample;
00259   unsigned int                      m_CurrentClassLabel;
00260   UniqueClassLabelsType             m_UniqueClassLabels;
00261   ClassLabelHolderType              m_ClassLabelHolder;
00262   unsigned int                      m_NumberOfClasses;
00263   std::vector< unsigned int >       m_ClassSampleSizes;
00264   std::vector< ClassSamplePointer > m_ClassSamples;
00265 }; // end of class
00266 
00267 
00268 } // end of namespace Statistics 
00269 } // end of namespace itk
00270 
00271 
00272 #ifndef ITK_MANUAL_INSTANTIATION
00273 #include "itkMembershipSample.txx"
00274 #endif
00275 
00276 #endif
00277 

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