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itk::Statistics::GaussianMembershipFunction< TMeasurementVector > Class Template Reference

#include <itkGaussianMembershipFunction.h>

+ Inheritance diagram for itk::Statistics::GaussianMembershipFunction< TMeasurementVector >:
+ Collaboration diagram for itk::Statistics::GaussianMembershipFunction< TMeasurementVector >:

Detailed Description

template<typename TMeasurementVector>
class itk::Statistics::GaussianMembershipFunction< TMeasurementVector >

GaussianMembershipFunction models class membership through a multivariate Gaussian function.

GaussianMembershipFunction is a subclass of MembershipFunctionBase that models class membership (or likelihood) using a multivariate Gaussian function. The mean and covariance structure of the Gaussian are established using the methods SetMean() and SetCovariance(). The mean is a vector-type that is the same vector-type as the measurement vector but guaranteed to have a real element type. For instance, if the measurement type is an Vector<int,3>, then the mean is Vector<double,3>. If the measurement type is a VariableLengthVector<float>, then the mean is VariableLengthVector<double>. In contrast to this behavior, the covariance is always a VariableSizeMatrix<double>.

If the covariance is singular or nearly singular, the membership function behaves somewhat like an impulse located at the mean. In this case, we specify the covariance to be a diagonal matrix with large values along the diagonal. This membership function, therefore, will return small but differentiable values everywher and increase sharply near the mean.

Examples:
Statistics/BayesianPluginClassifier.cxx, and Statistics/GaussianMembershipFunction.cxx.

Definition at line 55 of file itkGaussianMembershipFunction.h.

Public Types

typedef SmartPointer< const SelfConstPointer
 
typedef VariableSizeMatrix
< double > 
CovarianceMatrixType
 
typedef MeasurementVectorRealType MeanVectorType
 
typedef itk::NumericTraits
< MeasurementVectorType >
::RealType 
MeasurementVectorRealType
 
typedef
Superclass::MeasurementVectorSizeType 
MeasurementVectorSizeType
 
typedef TMeasurementVector MeasurementVectorType
 
typedef Superclass::Pointer MembershipFunctionPointer
 
typedef SmartPointer< SelfPointer
 
typedef GaussianMembershipFunction Self
 
typedef MembershipFunctionBase
< TMeasurementVector > 
Superclass
 
- Public Types inherited from itk::Statistics::MembershipFunctionBase< TMeasurementVector >
typedef SmartPointer< const SelfConstPointer
 
typedef unsigned int MeasurementVectorSizeType
 
typedef TMeasurementVector MeasurementVectorType
 
typedef SmartPointer< SelfPointer
 
typedef MembershipFunctionBase Self
 
typedef FunctionBase
< TMeasurementVector, double > 
Superclass
 
- Public Types inherited from itk::FunctionBase< TMeasurementVector, double >
typedef SmartPointer< const SelfConstPointer
 
typedef TMeasurementVector InputType
 
typedef double OutputType
 
typedef SmartPointer< SelfPointer
 
typedef FunctionBase Self
 
typedef Object Superclass
 
- Public Types inherited from itk::Object
typedef SmartPointer< const SelfConstPointer
 
typedef SmartPointer< SelfPointer
 
typedef Object Self
 
typedef LightObject Superclass
 
- Public Types inherited from itk::LightObject
typedef SmartPointer< const SelfConstPointer
 
typedef SmartPointer< SelfPointer
 
typedef LightObject Self
 

Public Member Functions

double Evaluate (const MeasurementVectorType &measurement) const
 
virtual const
CovarianceMatrixType
GetCovariance () const
 
virtual const
CovarianceMatrixType
GetInverseCovariance () const
 
virtual const MeanVectorTypeGetMean () const
 
virtual LightObject::Pointer InternalClone () const
 
void SetCovariance (const CovarianceMatrixType &cov)
 
void SetMean (const MeanVectorType &mean)
 
- Public Member Functions inherited from itk::Statistics::MembershipFunctionBase< TMeasurementVector >
virtual MeasurementVectorSizeType GetMeasurementVectorSize () const
 
virtual void SetMeasurementVectorSize (MeasurementVectorSizeType s)
 
- 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
 
CommandGetCommand (unsigned long tag)
 
bool GetDebug () const
 
MetaDataDictionaryGetMetaDataDictionary (void)
 
const MetaDataDictionaryGetMetaDataDictionary (void) const
 
virtual ModifiedTimeType GetMTime () const
 
virtual const TimeStampGetTimeStamp () const
 
bool HasObserver (const EventObject &event) const
 
void InvokeEvent (const EventObject &)
 
void InvokeEvent (const EventObject &) const
 
virtual void Modified () const
 
virtual void Register () const ITK_OVERRIDE
 
void RemoveAllObservers ()
 
void RemoveObserver (unsigned long tag)
 
void SetDebug (bool debugFlag) const
 
void SetMetaDataDictionary (const MetaDataDictionary &rhs)
 
virtual void SetReferenceCount (int) ITK_OVERRIDE
 
virtual void UnRegister () const ITK_OVERRIDE
 
virtual void SetObjectName (std::string _arg)
 
virtual const std::string & GetObjectName () 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

 GaussianMembershipFunction (void)
 
void PrintSelf (std::ostream &os, Indent indent) const
 
virtual ~GaussianMembershipFunction (void)
 
- Protected Member Functions inherited from itk::Statistics::MembershipFunctionBase< TMeasurementVector >
 MembershipFunctionBase ()
 
void PrintSelf (std::ostream &os, Indent indent) const
 
virtual ~MembershipFunctionBase (void)
 
- Protected Member Functions inherited from itk::FunctionBase< TMeasurementVector, double >
 FunctionBase ()
 
 ~FunctionBase ()
 
- 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
 LightObject ()
 
virtual void PrintHeader (std::ostream &os, Indent indent) const
 
virtual void PrintTrailer (std::ostream &os, Indent indent) const
 
virtual ~LightObject ()
 

Private Member Functions

 GaussianMembershipFunction (const Self &)
 
void operator= (const Self &)
 

Private Attributes

CovarianceMatrixType m_Covariance
 
bool m_CovarianceNonsingular
 
CovarianceMatrixType m_InverseCovariance
 
MeanVectorType m_Mean
 
double m_PreFactor
 
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)
 
- Static Public Member Functions inherited from itk::LightObject
static void BreakOnError ()
 
static Pointer New ()
 
- 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<typename TMeasurementVector >
typedef SmartPointer< const Self > itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::ConstPointer

Definition at line 63 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef VariableSizeMatrix< double > itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::CovarianceMatrixType

Type of the covariance matrix

Definition at line 85 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef MeasurementVectorRealType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::MeanVectorType

Definition at line 82 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef itk::NumericTraits< MeasurementVectorType >::RealType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::MeasurementVectorRealType

Type of the mean vector. RealType on a vector-type is the same vector-type but with a real element type.

Definition at line 81 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef Superclass::MeasurementVectorSizeType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::MeasurementVectorSizeType

Length of each measurement vector

Definition at line 77 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef TMeasurementVector itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::MeasurementVectorType

Typedef alias for the measurement vectors

Definition at line 74 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef Superclass::Pointer itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::MembershipFunctionPointer

SmartPointer class for superclass

Definition at line 67 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef SmartPointer< Self > itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::Pointer

Definition at line 62 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef GaussianMembershipFunction itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::Self

Standard class typedefs

Definition at line 60 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
typedef MembershipFunctionBase< TMeasurementVector > itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::Superclass

Definition at line 61 of file itkGaussianMembershipFunction.h.

Constructor & Destructor Documentation

template<typename TMeasurementVector >
itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GaussianMembershipFunction ( void  )
protected
template<typename TMeasurementVector >
virtual itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::~GaussianMembershipFunction ( void  )
inlineprotectedvirtual

Definition at line 119 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GaussianMembershipFunction ( const Self )
private

Member Function Documentation

template<typename TMeasurementVector >
virtual::itk::LightObject::Pointer itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::CreateAnother ( void  ) const
virtual

Standard macros

Reimplemented from itk::Object.

template<typename TMeasurementVector >
double itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::Evaluate ( const MeasurementVectorType measurement) const
virtual

Evaluate the probability density of a measurement vector.

Implements itk::Statistics::MembershipFunctionBase< TMeasurementVector >.

template<typename TMeasurementVector >
virtual const CovarianceMatrixType& itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GetCovariance ( ) const
virtual
template<typename TMeasurementVector >
virtual const CovarianceMatrixType& itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GetInverseCovariance ( ) const
virtual
template<typename TMeasurementVector >
virtual const MeanVectorType& itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GetMean ( ) const
virtual

Get the mean of the Gaussian distribution. Mean is a vector type similar to the measurement type but with a real element type.

template<typename TMeasurementVector >
virtual const char* itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::GetNameOfClass ( ) const
virtual
template<typename TMeasurementVector >
virtual LightObject::Pointer itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::InternalClone ( ) const
virtual

Method to clone a membership function, i.e. create a new instance of the same type of membership function and configure its ivars to match.

Reimplemented from itk::LightObject.

template<typename TMeasurementVector >
static Pointer itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::New ( )
static

Standard macros

template<typename TMeasurementVector >
void itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::operator= ( const Self )
private
template<typename TMeasurementVector >
void itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::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<typename TMeasurementVector >
void itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::SetCovariance ( const CovarianceMatrixType cov)

Set the covariance matrix. Covariance matrix is a VariableSizeMatrix of doubles. The inverse of the covariance matrix and the normlization term for the multivariate Gaussian are calculate whenever the covaraince matrix is changed.

template<typename TMeasurementVector >
void itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::SetMean ( const MeanVectorType mean)

Set the mean of the Gaussian distribution. Mean is a vector type similar to the measurement type but with a real element type.

Member Data Documentation

template<typename TMeasurementVector >
CovarianceMatrixType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::m_Covariance
private

Definition at line 127 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
bool itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::m_CovarianceNonsingular
private

Boolean to cache whether the covarinace is singular or nearly singular

Definition at line 138 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
CovarianceMatrixType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::m_InverseCovariance
private

Definition at line 131 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
MeanVectorType itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::m_Mean
private

Definition at line 126 of file itkGaussianMembershipFunction.h.

template<typename TMeasurementVector >
double itk::Statistics::GaussianMembershipFunction< TMeasurementVector >::m_PreFactor
private

Definition at line 135 of file itkGaussianMembershipFunction.h.


The documentation for this class was generated from the following file: