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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 {
/** \class DistanceToCentroidMembershipFunction
* \brief class represents DistanceToCentroid Density Function.
*
* This class keeps parameter to define DistanceToCentroid Density Function and has
* method to return the probability density
* of an instance. MeasurementVectorSize is the dimension of measurement
* space.
* double is type of measurement.
*/
template< class TVector >
class ITK_EXPORT DistanceToCentroidMembershipFunction :
public MembershipFunctionBase< TVector >
{
public:
/** Standard class typedefs */
typedef DistanceToCentroidMembershipFunction Self;
typedef MembershipFunctionBase< TVector > Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Strandard macros */
itkTypeMacro(DistanceToCentroidMembershipFunction,
MembershipFunctionBase);
itkNewMacro(Self);
/** Typedef alias for the measurement vectors */
typedef TVector MeasurementVectorType;
/** Typedef to represent the length of measurement vectors */
typedef typename Superclass::MeasurementVectorSizeType
MeasurementVectorSizeType;
/** Set the length of each measurement vector. */
virtual void SetMeasurementVectorSize( const MeasurementVectorSizeType );
/** Method to set mean */
void SetCentroid(const vnl_vector<double> ¢roid);
/** Method to get mean */
const vnl_vector<double> & GetCentroid() const;
/** Method to set the number of samples */
itkSetMacro( NumberOfSamples, int );
/** Method to get the number of samples */
itkGetMacro( NumberOfSamples, int );
/**
* Method to get probability of an instance. The return value is the
* value of the density function, not probability. */
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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