Numerics/Statistics/itkMixtureModelComponentBase.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkMixtureModelComponentBase.h,v $
  Language:  C++
  Date:      $Date: 2009-03-04 15:24:02 $
  Version:   $Revision: 1.10 $

  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