Numerics/Statistics/itkDistanceToCentroidMembershipFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkDistanceToCentroidMembershipFunction.h,v $
  Language:  C++
  Date:      $Date: 2009-03-04 15:23:46 $
  Version:   $Revision: 1.11 $

  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 __itkDistanceToCentroidMembershipFunction_h
#define __itkDistanceToCentroidMembershipFunction_h

#include <vnl/vnl_vector.h>
#include <vnl/vnl_transpose.h>
#include <vnl/vnl_matrix.h>
#include <vnl/algo/vnl_matrix_inverse.h>
#include <vnl/algo/vnl_determinant.h>


#include "itkMembershipFunctionBase.h"

namespace itk { 
namespace Statistics {

template< class TVector >
class ITK_EXPORT DistanceToCentroidMembershipFunction :
      public MembershipFunctionBase< TVector >
{
public:
  typedef DistanceToCentroidMembershipFunction Self;
  typedef MembershipFunctionBase< TVector >    Superclass;
  typedef SmartPointer<Self>                   Pointer;
  typedef SmartPointer<const Self>             ConstPointer;

  itkTypeMacro(DistanceToCentroidMembershipFunction,
               MembershipFunctionBase);
  itkNewMacro(Self);

  typedef TVector MeasurementVectorType;

  typedef typename Superclass::MeasurementVectorSizeType 
                                                  MeasurementVectorSizeType;

  virtual void SetMeasurementVectorSize( const MeasurementVectorSizeType );

  void SetCentroid(const vnl_vector<double> &centroid);

  const vnl_vector<double> & GetCentroid() const;

  itkSetMacro( NumberOfSamples, int );

  itkGetMacro( NumberOfSamples, int );

  double Evaluate(const MeasurementVectorType &measurement) const;

protected:
  DistanceToCentroidMembershipFunction(void);
  virtual ~DistanceToCentroidMembershipFunction(void) {}
  void PrintSelf(std::ostream& os, Indent indent) const;

private:
  vnl_vector< double >  m_Centroid;              // mean

  // Number of samples defining this density
  int m_NumberOfSamples;
};

} // end of namespace Statistics
} // end namespace itk

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

#endif

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