#include <itkMaximumRatioDecisionRule.h>

Inheritance diagram for itk::Statistics::MaximumRatioDecisionRule:

Collaboration diagram for itk::Statistics::MaximumRatioDecisionRule:

Public Types
typedef Superclass::ClassIdentifierType	ClassIdentifierType
typedef Superclass::MembershipValueType	MembershipValueType
typedef Superclass::MembershipVectorType	MembershipVectorType
typedef SmartPointer< Self >	Pointer
typedef MembershipValueType	PriorProbabilityValueType
typedef PriorProbabilityVectorType::size_type	PriorProbabilityVectorSizeType
typedef std::vector < PriorProbabilityValueType >	PriorProbabilityVectorType
typedef MaximumRatioDecisionRule	Self
typedef DecisionRule	Superclass
Public Types inherited from itk::Statistics::DecisionRule
typedef SmartPointer< const Self >	ConstPointer
Public Types inherited from itk::Object
Public Types inherited from itk::LightObject

Public Member Functions
virtual ::itk::LightObject::Pointer	CreateAnother (void) const
virtual ClassIdentifierType	Evaluate (const MembershipVectorType &discriminantScores) const
virtual const char *	GetNameOfClass () const
virtual const PriorProbabilityVectorType &	GetPriorProbabilities ()
void	SetPriorProbabilities (const PriorProbabilityVectorType &p)

Static Public Member Functions
static Pointer	New ()

Protected Member Functions
	MaximumRatioDecisionRule ()
void	PrintSelf (std::ostream &os, Indent indent) const
virtual	~MaximumRatioDecisionRule ()
Protected Member Functions inherited from itk::Statistics::DecisionRule
	DecisionRule ()
virtual	~DecisionRule ()
Protected Member Functions inherited from itk::Object
	Object ()
bool	PrintObservers (std::ostream &os, Indent indent) const
virtual void	SetTimeStamp (const TimeStamp &time)
virtual	~Object ()
Protected Member Functions inherited from itk::LightObject
virtual LightObject::Pointer	InternalClone () const
	LightObject ()
virtual void	PrintHeader (std::ostream &os, Indent indent) const
virtual void	PrintTrailer (std::ostream &os, Indent indent) const
virtual	~LightObject ()

Private Member Functions
	MaximumRatioDecisionRule (const Self &)
void	operator= (const Self &)

Private Attributes
PriorProbabilityVectorType	m_PriorProbabilities

Detailed Description

A decision rule that operates as a frequentist's approximation to Bayes rule.

MaximumRatioDecisionRule returns the class label using a Bayesian style decision rule. The discriminant scores are evaluated in the context of class priors. If the discriminant scores are actual conditional probabilites (likelihoods) and the class priors are actual a priori class probabilities, then this decision rule operates as Bayes rule, returning the class $i$ if $p(x|i) p(i) > p(x|j) p(j)$ for all class $j$ . The discriminant scores and priors are not required to be true probabilities.

This class is named the MaximumRatioDecisionRule as it can be implemented as returning the class $i$ if $\frac{p(x|i)}{p(x|j)} > \frac{p(j)}{p(i)}$ for all class $j$ .

A priori values need to be set before calling the Evaluate method. If they are not set, a uniform prior is assumed.

See also:: MaximumDecisionRule, MinimumDecisionRule

Definition at line 57 of file itkMaximumRatioDecisionRule.h.

Member Typedef Documentation

typedef Superclass::ClassIdentifierType itk::Statistics::MaximumRatioDecisionRule::ClassIdentifierType

Types for class identifiers.

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 76 of file itkMaximumRatioDecisionRule.h.

typedef Superclass::MembershipValueType itk::Statistics::MaximumRatioDecisionRule::MembershipValueType

Types for discriminant values and vectors.

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 69 of file itkMaximumRatioDecisionRule.h.

typedef Superclass::MembershipVectorType itk::Statistics::MaximumRatioDecisionRule::MembershipVectorType

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 73 of file itkMaximumRatioDecisionRule.h.

typedef SmartPointer< Self > itk::Statistics::MaximumRatioDecisionRule::Pointer

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 63 of file itkMaximumRatioDecisionRule.h.

typedef MembershipValueType itk::Statistics::MaximumRatioDecisionRule::PriorProbabilityValueType

Types for priors and values

Definition at line 79 of file itkMaximumRatioDecisionRule.h.

typedef PriorProbabilityVectorType::size_type itk::Statistics::MaximumRatioDecisionRule::PriorProbabilityVectorSizeType

Definition at line 81 of file itkMaximumRatioDecisionRule.h.

typedef std::vector< PriorProbabilityValueType > itk::Statistics::MaximumRatioDecisionRule::PriorProbabilityVectorType

Definition at line 80 of file itkMaximumRatioDecisionRule.h.

typedef MaximumRatioDecisionRule itk::Statistics::MaximumRatioDecisionRule::Self

Standard class typedefs

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 61 of file itkMaximumRatioDecisionRule.h.

typedef DecisionRule itk::Statistics::MaximumRatioDecisionRule::Superclass

Reimplemented from itk::Statistics::DecisionRule.

Definition at line 62 of file itkMaximumRatioDecisionRule.h.

Constructor & Destructor Documentation

itk::Statistics::MaximumRatioDecisionRule::MaximumRatioDecisionRule ( )

protected

virtual itk::Statistics::MaximumRatioDecisionRule::~MaximumRatioDecisionRule ( )

inlineprotectedvirtual

Definition at line 103 of file itkMaximumRatioDecisionRule.h.

itk::Statistics::MaximumRatioDecisionRule::MaximumRatioDecisionRule ( const Self & )

private

Member Function Documentation

virtual::itk::LightObject::Pointer itk::Statistics::MaximumRatioDecisionRule::CreateAnother ( void ) const

virtual

Create an object from an instance, potentially deferring to a factory. This method allows you to create an instance of an object that is exactly the same type as the referring object. This is useful in cases where an object has been cast back to a base class.

Reimplemented from itk::Object.

virtual ClassIdentifierType itk::Statistics::MaximumRatioDecisionRule::Evaluate ( const MembershipVectorType & discriminantScores ) const

virtual

Evaluate the decision rule $p(x|i) p(i) > p(x|j) p(j)$ . Prior probabilities need to be set before calling Evaluate() using the SetPriorProbabilities() method (otherwise a uniform prior is assumed). Parameter to Evaluate() is the discriminant score in the form of a likelihood $p(x|i)$ .

Implements itk::Statistics::DecisionRule.

virtual const char* itk::Statistics::MaximumRatioDecisionRule::GetNameOfClass ( ) const

virtual

Run-time type information (and related methods)

Reimplemented from itk::Statistics::DecisionRule.

virtual const PriorProbabilityVectorType& itk::Statistics::MaximumRatioDecisionRule::GetPriorProbabilities ( )

virtual

Get the prior probabilities.

static Pointer itk::Statistics::MaximumRatioDecisionRule::New ( )

static

Standard New() method support

Reimplemented from itk::Object.

void itk::Statistics::MaximumRatioDecisionRule::operator= ( const Self & )

private

Mutex lock to protect modification to the reference count

Reimplemented from itk::Statistics::DecisionRule.

void itk::Statistics::MaximumRatioDecisionRule::PrintSelf	(	std::ostream &	os,
		Indent	indent
	)		const

protectedvirtual

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from itk::Object.

void itk::Statistics::MaximumRatioDecisionRule::SetPriorProbabilities ( const PriorProbabilityVectorType & p )

Set the prior probabilities used in evaluating $p(x|i) p(i) > p(x|j) p(j)$ . The likelihoods are set using the Evaluate() method. SetPriorProbabilities needs to be called before Evaluate(). If not set, assumes a uniform prior.