#include <itkExpectationMaximizationMixtureModelEstimator.h>

Inheritance diagram for itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >:

Collaboration diagram for itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >:

Detailed Description

template<class TSample>
class itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >

This class generates the parameter estimates for a mixture model using expectation maximization strategy.

The first template argument is the type of the target sample data. This estimator expects one or more mixture model component objects of the classes derived from the MixtureModelComponentBase. The actual component (or module) parameters are updated by each component. Users can think this class as a strategy or a integration point for the EM procedure. The initial proportion (SetInitialProportions), the input sample (SetSample), the mixture model components (AddComponent), and the maximum iteration (SetMaximumIteration) are required. The EM procedure terminates when the current iteration reaches the maximum iteration or the model parameters converge.

Recent API changes: The static const macro to get the length of a measurement vector, MeasurementVectorSize has been removed to allow the length of a measurement vector to be specified at run time. It is now obtained at run time from the sample set as input. Please use the function GetMeasurementVectorSize() to get the length.

See Also: MixtureModelComponentBase, GaussianMixtureModelComponent

Wiki Examples:

All Examples

2D Gaussian Mixture Model Expectation Maximization

Definition at line 61 of file itkExpectationMaximizationMixtureModelEstimator.h.

Public Types
typedef MembershipFunctionBase < MeasurementVectorType >	ComponentMembershipFunctionType

typedef MixtureModelComponentBase < TSample >	ComponentType

typedef std::vector < ComponentType * >	ComponentVectorType

typedef SmartPointer< const Self >	ConstPointer

typedef GaussianMembershipFunctionType::Pointer	GaussianMembershipFunctionPointer

typedef GaussianMembershipFunction < MeasurementVectorType >	GaussianMembershipFunctionType

typedef TSample::MeasurementType	MeasurementType

typedef TSample::MeasurementVectorType	MeasurementVectorType

typedef MembershipFunctionType::ConstPointer	MembershipFunctionPointer

typedef SimpleDataObjectDecorator < ProportionVectorType >	MembershipFunctionsWeightsArrayObjectType

typedef MembershipFunctionsWeightsArrayObjectType::Pointer	MembershipFunctionsWeightsArrayPointer

typedef MembershipFunctionBase < MeasurementVectorType >	MembershipFunctionType

typedef MembershipFunctionVectorObjectType::Pointer	MembershipFunctionVectorObjectPointer

typedef SimpleDataObjectDecorator < MembershipFunctionVectorType >	MembershipFunctionVectorObjectType

typedef std::vector < MembershipFunctionPointer >	MembershipFunctionVectorType

typedef SmartPointer< Self >	Pointer

typedef Array< double >	ProportionVectorType

typedef TSample	SampleType

typedef ExpectationMaximizationMixtureModelEstimator	Self

typedef Object	Superclass

enum	TERMINATION_CODE { CONVERGED = 0, NOT_CONVERGED = 1 }

Public Types inherited from itk::Object
typedef SmartPointer< const Self >	ConstPointer

typedef SmartPointer< Self >	Pointer

typedef Object	Self

typedef LightObject	Superclass

Public Types inherited from itk::LightObject
typedef SmartPointer< const Self >	ConstPointer

typedef SmartPointer< Self >	Pointer

typedef LightObject	Self

Public Member Functions
int	AddComponent (ComponentType *component)

ComponentMembershipFunctionType *	GetComponentMembershipFunction (int componentIndex) const

int	GetCurrentIteration ()

const ProportionVectorType &	GetInitialProportions () const

int	GetMaximumIteration () const

const MembershipFunctionsWeightsArrayObjectType *	GetMembershipFunctionsWeightsArray () const

unsigned int	GetNumberOfComponents () const

const MembershipFunctionVectorObjectType *	GetOutput () const

const ProportionVectorType &	GetProportions () const

const TSample *	GetSample () const

TERMINATION_CODE	GetTerminationCode () const

void	SetInitialProportions (ProportionVectorType &propotion)

void	SetMaximumIteration (int numberOfIterations)

void	SetSample (const TSample *sample)

void	Update ()

Public Member Functions inherited from itk::Object
unsigned long	AddObserver (const EventObject &event, Command *)

unsigned long	AddObserver (const EventObject &event, Command *) const

virtual void	DebugOff () const

virtual void	DebugOn () const

Command *	GetCommand (unsigned long tag)

bool	GetDebug () const

MetaDataDictionary &	GetMetaDataDictionary (void)

const MetaDataDictionary &	GetMetaDataDictionary (void) const

virtual ModifiedTimeType	GetMTime () const

virtual const TimeStamp &	GetTimeStamp () const

bool	HasObserver (const EventObject &event) const

void	InvokeEvent (const EventObject &)

void	InvokeEvent (const EventObject &) const

virtual void	Modified () const

virtual void	Register () const

void	RemoveAllObservers ()

void	RemoveObserver (unsigned long tag)

void	SetDebug (bool debugFlag) const

void	SetMetaDataDictionary (const MetaDataDictionary &rhs)

virtual void	SetReferenceCount (int)

virtual void	UnRegister () const

Public Member Functions inherited from itk::LightObject
virtual void	Delete ()

virtual int	GetReferenceCount () const

	itkCloneMacro (Self)

void	Print (std::ostream &os, Indent indent=0) const

Protected Member Functions
bool	CalculateDensities ()

double	CalculateExpectation () const

	ExpectationMaximizationMixtureModelEstimator ()

void	GenerateData ()

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

bool	UpdateComponentParameters ()

bool	UpdateProportions ()

virtual	~ExpectationMaximizationMixtureModelEstimator ()

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 Attributes
ComponentVectorType	m_ComponentVector

int	m_CurrentIteration

ProportionVectorType	m_InitialProportions

int	m_MaxIteration

MembershipFunctionVectorObjectPointer	m_MembershipFunctionsObject

MembershipFunctionsWeightsArrayPointer	m_MembershipFunctionsWeightArrayObject

ProportionVectorType	m_Proportions

const TSample *	m_Sample

TERMINATION_CODE	m_TerminationCode

virtual const char *	GetNameOfClass () const

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

static Pointer	New ()

Additional Inherited Members
Static Public Member Functions inherited from itk::Object
static bool	GetGlobalWarningDisplay ()

static void	GlobalWarningDisplayOff ()

static void	GlobalWarningDisplayOn ()

static Pointer	New ()

static void	SetGlobalWarningDisplay (bool flag)

Protected Types inherited from itk::LightObject
typedef int	InternalReferenceCountType

Protected Attributes inherited from itk::LightObject
InternalReferenceCountType	m_ReferenceCount

SimpleFastMutexLock	m_ReferenceCountLock

Member Typedef Documentation

template<class TSample >

typedef MembershipFunctionBase< MeasurementVectorType > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentMembershipFunctionType

Type of the membership function base class

Definition at line 105 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef MixtureModelComponentBase< TSample > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentType

Type of the mixture model component base class

Definition at line 98 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef std::vector< ComponentType * > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ComponentVectorType

Type of the component pointer storage

Definition at line 101 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef SmartPointer< const Self > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ConstPointer

Definition at line 68 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef GaussianMembershipFunctionType::Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GaussianMembershipFunctionPointer

Definition at line 87 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef GaussianMembershipFunction< MeasurementVectorType > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GaussianMembershipFunctionType

Typedef requried to generate dataobject decorated output that can be plugged into SampleClassifierFilter

Definition at line 84 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef TSample::MeasurementType itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MeasurementType

Definition at line 78 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef TSample::MeasurementVectorType itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MeasurementVectorType

Definition at line 79 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef MembershipFunctionType::ConstPointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionPointer

Definition at line 90 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef SimpleDataObjectDecorator< ProportionVectorType > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionsWeightsArrayObjectType

typedef for decorated array of proportion

Definition at line 127 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef MembershipFunctionsWeightsArrayObjectType::Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionsWeightsArrayPointer

Definition at line 129 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef MembershipFunctionBase< MeasurementVectorType > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionType

Definition at line 89 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef MembershipFunctionVectorObjectType::Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorObjectPointer

Definition at line 95 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef SimpleDataObjectDecorator< MembershipFunctionVectorType > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorObjectType

Definition at line 93 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef std::vector< MembershipFunctionPointer > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::MembershipFunctionVectorType

Definition at line 91 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef SmartPointer< Self > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Pointer

Definition at line 67 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef Array< double > itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ProportionVectorType

Type of the array of the proportion values

Definition at line 108 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef TSample itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SampleType

TSample template argument related typedefs

Definition at line 73 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef ExpectationMaximizationMixtureModelEstimator itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Self

Standard class typedef

Definition at line 65 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

typedef Object itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Superclass

Definition at line 66 of file itkExpectationMaximizationMixtureModelEstimator.h.

Member Enumeration Documentation

template<class TSample >

enum itk::Statistics::ExpectationMaximizationMixtureModelEstimator::TERMINATION_CODE

Termination status after running optimization

Enumerator:

CONVERGED
NOT_CONVERGED

Definition at line 158 of file itkExpectationMaximizationMixtureModelEstimator.h.

Constructor & Destructor Documentation

template<class TSample >

itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::ExpectationMaximizationMixtureModelEstimator ( )

protected

template<class TSample >

virtual itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::~ExpectationMaximizationMixtureModelEstimator ( )

inlineprotectedvirtual

Definition at line 173 of file itkExpectationMaximizationMixtureModelEstimator.h.

Member Function Documentation

template<class TSample >

int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::AddComponent ( ComponentType * component )

Adds a new component (or class).

template<class TSample >

bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::CalculateDensities ( )

protected

template<class TSample >

double itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::CalculateExpectation ( ) const

protected

template<class TSample >

virtual::itk::LightObject::Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::CreateAnother ( void ) const

virtual

Standard macros

Reimplemented from itk::Object.

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GenerateData ( )

protected

Starts the estimation process

template<class TSample >

ComponentMembershipFunctionType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetComponentMembershipFunction ( int componentIndex ) const

Gets the membership function specified by componentIndex argument.

template<class TSample >

int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetCurrentIteration ( )

inline

Gets the current iteration.

Definition at line 143 of file itkExpectationMaximizationMixtureModelEstimator.h.

template<class TSample >

const ProportionVectorType& itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetInitialProportions ( ) const

template<class TSample >

int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetMaximumIteration ( ) const

template<class TSample >

const MembershipFunctionsWeightsArrayObjectType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetMembershipFunctionsWeightsArray ( ) const

Get method for data decorated Membership functions weights array

template<class TSample >

virtual const char* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetNameOfClass ( ) const

virtual

Standard macros

Reimplemented from itk::Object.

template<class TSample >

unsigned int itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetNumberOfComponents ( ) const

Gets the total number of classes currently plugged in.

template<class TSample >

const MembershipFunctionVectorObjectType* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetOutput ( ) const

Output Membership function vector containing the membership functions with the final optimized parameters

template<class TSample >

const ProportionVectorType& itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetProportions ( ) const

Gets the result proportion values

template<class TSample >

const TSample* itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetSample ( ) const

Returns the target data

template<class TSample >

TERMINATION_CODE itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::GetTerminationCode ( ) const

Gets the termination status

template<class TSample >

static Pointer itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::New ( )

static

Standard macros

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::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.

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetInitialProportions ( ProportionVectorType & propotion )

Set/Gets the initial proportion values. The size of proportion vector should be same as the number of component (or classes)

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetMaximumIteration ( int numberOfIterations )

Set/Gets the maximum number of iterations. When the optimization process reaches the maximum number of interations, even if the class parameters aren't converged, the optimization process stops.

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::SetSample ( const TSample * sample )

Sets the target data that will be classified by this

template<class TSample >

void itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::Update ( )

Runs the optimization process.

template<class TSample >

bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::UpdateComponentParameters ( )

protected

template<class TSample >

bool itk::Statistics::ExpectationMaximizationMixtureModelEstimator< TSample >::UpdateProportions ( )

protected