itkMixtureModelComponentBase.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkMixtureModelComponentBase.h,v $
  Language:  C++
  Date:      $Date: 2005/07/26 15:55:04 $
  Version:   $Revision: 1.9 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkMixtureModelComponentBase_h
#define __itkMixtureModelComponentBase_h

#include <vnl/vnl_vector.h>
#include <vnl/vnl_matrix.h>

#include "itkArray.h"
#include "itkObject.h"
#include "itkMembershipFunctionBase.h"

namespace itk{ 
namespace Statistics{
  
template< class TSample >
class MixtureModelComponentBase :
    public Object
{
public:
  typedef MixtureModelComponentBase Self;
  typedef Object Superclass ;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self> ConstPointer;

  itkTypeMacro(MixtureModelComponentBase, Object);
  itkNewMacro(Self) ;
  
  typedef typename TSample::MeasurementVectorType     MeasurementVectorType ;
  typedef typename TSample::MeasurementVectorSizeType MeasurementVectorSizeType;

  typedef MembershipFunctionBase< MeasurementVectorType >
  MembershipFunctionType ;

  typedef Array< double > WeightArrayType ;

  typedef Array< double > ParametersType ;

  virtual void SetSample(const TSample* sample) ;
  
  const TSample* GetSample() const;

  MembershipFunctionType* GetMembershipFunction() ;

  void SetMinimalParametersChange(double change)
  { m_MinimalParametersChange = change ; }

  double GetMinimalParametersChange()
  { return m_MinimalParametersChange ; }

  virtual void SetParameters(const ParametersType &parameters) ;

  virtual ParametersType GetFullParameters()
  { return m_Parameters ; }


  void AreParametersModified(bool flag) ;

  bool AreParametersModified() ;

  void SetWeight(int index, double value) ;
  
  double GetWeight(int index) ;

  double Evaluate(MeasurementVectorType& measurements) ;

  WeightArrayType* GetWeights() ;

  virtual void Update() ;
  
protected:
  MixtureModelComponentBase() ;
  virtual ~MixtureModelComponentBase() ;
  void PrintSelf(std::ostream& os, Indent indent) const;

  void CreateWeightArray() ;
  void DeleteWeightArray() ;
  void SetMembershipFunction(MembershipFunctionType* function) ;

  virtual void GenerateData() ;

private:
  const TSample* m_Sample ;

  double m_MinimalParametersChange ;

  ParametersType m_Parameters ;
  MembershipFunctionType* m_MembershipFunction ;
  WeightArrayType* m_Weights ;
  bool m_ParametersModified ;
  
} ; // end of class
    
} // end of namespace Statistics 
} // end of namespace itk 

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMixtureModelComponentBase.txx"
#endif

#endif

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