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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkMembershipFunctionBase.h,v $
Language: C++
Date: $Date: 2009-03-04 15:24:02 $
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 __itkMembershipFunctionBase_h
#define __itkMembershipFunctionBase_h
#include "itkFunctionBase.h"
#include "itkMeasurementVectorTraits.h"
namespace itk {
namespace Statistics {
/** \class MembershipFunctionBase
* \brief MembershipFunctionBase class declares common interfaces
* for membership functions.
*
* As a function derived from FunctionBase, users use Evaluate method
* get result. However, the return value type of the method is fixed
* as double. Any function derived from this class returns quantitative
* measure for how well the vector x belong to the class ( or group)
* represented by the function.
*/
template< class TVector >
class ITK_EXPORT MembershipFunctionBase :
public FunctionBase< TVector, double >
{
public:
/** Standard class typedefs */
typedef MembershipFunctionBase Self;
typedef FunctionBase< TVector, double > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Strandard macros */
itkTypeMacro(MembershipFunctionBase, FunctionBase);
/** Typedef for the length of each measurement vector */
typedef unsigned int MeasurementVectorSizeType;
/** Method to get membership score (discriminant score) of an entity. */
virtual double Evaluate(const TVector &x) const = 0;
/** Set/Get Macros to set the length of each measurement vector. */
itkSetMacro( MeasurementVectorSize, MeasurementVectorSizeType );
itkGetConstMacro( MeasurementVectorSize, MeasurementVectorSizeType );
protected:
MembershipFunctionBase() : m_MeasurementVectorSize(
MeasurementVectorTraits::GetLength( TVector() ) ) {}
virtual ~MembershipFunctionBase(void) {}
void PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Length of measurement vectors: "
<< m_MeasurementVectorSize << std::endl;
}
MeasurementVectorSizeType m_MeasurementVectorSize;
}; // end of class
} // end of namespace Statistics
} // end namespace itk
#endif
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