Beta behavior over SOM training phase. More...

#include <otbCzihoSOMLearningBehaviorFunctor.h>

Public Member Functions
	CzihoSOMLearningBehaviorFunctor ()

virtual	~CzihoSOMLearningBehaviorFunctor ()

unsigned int	GetIterationThreshold ()

virtual double	operator() (unsigned int currentIteration, unsigned int numberOfIterations, double betaInit, double betaEnd) const

template<unsigned int VDimension>
void	SetIterationThreshold (const itk::Size< VDimension > &sizeInit, unsigned int iterMax)

Private Attributes
unsigned int	m_IterationThreshold

Detailed Description

Beta behavior over SOM training phase.

This class implements an evolution of the $\beta$ weightening coefficient over the SOM training. It is issued from A. Cziho's PhD: "Compression d'images et analyse de contenu par quantification vectorielle" PhD dissertation, University of Rennes I, Rennes, France. May 5th, 1999.

Its behavior is decomposed into two steps depending on the number of iterations:

$\beta = \begin{cases} \beta_0 \left( 1 - \frac{t}{t_0} \right) & \textrm{ if } t < t_0 \\ \beta_{\textrm{end}} \left( 1- \frac{t-t_O}{t_{\textrm{end}}-t_0} \right) & \textrm{ if } t_0 \leqslant t < t_{\textrm{end}} \end{cases}$

where $ t_0 $ stands for IterationThreshold.

CzihoSOMLearningBehaviorFunctor uses some parameters of the SOM class such as: BetaInit, BetaEnd, NumberOfIterations, but also NeighborhoodSizeInit which may be (surprisingly) required for the IterationThreshold.

The functor function uses

NumberOfIterations

,

BetaInit

,

BetaEnd

parameters, that is why it is necessary to call a specific method for

IterationThreshold

intialization.

See Also: SOM

Definition at line 60 of file otbCzihoSOMLearningBehaviorFunctor.h.

Constructor & Destructor Documentation

otb::Functor::CzihoSOMLearningBehaviorFunctor::CzihoSOMLearningBehaviorFunctor ( )

inline

Empty constructor / descructor

Definition at line 64 of file otbCzihoSOMLearningBehaviorFunctor.h.

References m_IterationThreshold.

virtual otb::Functor::CzihoSOMLearningBehaviorFunctor::~CzihoSOMLearningBehaviorFunctor ( )

inlinevirtual

Definition at line 68 of file otbCzihoSOMLearningBehaviorFunctor.h.

Member Function Documentation

unsigned int otb::Functor::CzihoSOMLearningBehaviorFunctor::GetIterationThreshold ( )

inline

Accessors

Definition at line 71 of file otbCzihoSOMLearningBehaviorFunctor.h.

References m_IterationThreshold.

virtual double otb::Functor::CzihoSOMLearningBehaviorFunctor::operator()	(	unsigned int	currentIteration,
		unsigned int	numberOfIterations,
		double	betaInit,
		double	betaEnd
	)		const