ITK  4.1.0
Insight Segmentation and Registration Toolkit
Public Types | Public Member Functions | Protected Member Functions | Private Member Functions | Private Attributes
itk::ClassifierBase< TDataContainer > Class Template Reference

#include <itkClassifierBase.h>

+ Inheritance diagram for itk::ClassifierBase< TDataContainer >:
+ Collaboration diagram for itk::ClassifierBase< TDataContainer >:

List of all members.

Public Types

typedef Statistics::DecisionRule DecisionRuleType
typedef TDataContainer::ValueType MeasurementVectorType
typedef
MembershipFunctionType::Pointer 
MembershipFunctionPointer
typedef std::vector
< MembershipFunctionPointer
MembershipFunctionPointerVector
typedef
Statistics::MembershipFunctionBase
< MeasurementVectorType
MembershipFunctionType
typedef ClassifierBase Self
typedef LightProcessObject Superclass

Public Member Functions

unsigned int AddMembershipFunction (MembershipFunctionType *function)
DecisionRuleTypeGetDecisionRule (void)
const MembershipFunctionTypeGetMembershipFunction (unsigned int index) const
virtual const char * GetNameOfClass () const
virtual const unsigned int & GetNumberOfClasses ()
unsigned int GetNumberOfMembershipFunctions ()
void SetDecisionRule (DecisionRuleType *ptrToDecisionRule)
virtual void SetNumberOfClasses (unsigned int _arg)
void Update ()

Protected Member Functions

 ClassifierBase ()
virtual void GenerateData ()=0
void PrintSelf (std::ostream &os, Indent indent) const
 ~ClassifierBase ()

Private Member Functions

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

Private Attributes

DecisionRuleType::Pointer m_DecisionRule
MembershipFunctionPointerVector m_MembershipFunctions
unsigned int m_NumberOfClasses

Detailed Description

template<class TDataContainer>
class itk::ClassifierBase< TDataContainer >

Base class for classifier objects.

ClassifierBase is the base class for classifier objects. It provides the basic function definitions that are inherent to classifier objects.

This is the SuperClass for the classifier framework. This is an abstract class defining an interface for all the classification objects available through the classifier framework in the ITK toolkit.

The basic functionality of the classifier framework base class is to classify each data point in given a data set to one of the N classes where N is either specified by the user or automatically determined using methods such as k-means clustering techniques.

The classifier framework supports two types of data where (1) The input is a series of data points that needs to be classified. These points may be in the form of images where the pixels can be viewed as a list and the spatial location of the pixels in not of a concern. This classification can be carried out via the use of SampleClassifier.

(2)The input is specifically an image and the pixels cannot be viewed as a list of pixels since the spatial location of the pixel in needed for various algorithmic implementations (such as the Markov Random Field based approached). This type of data can be classified via the use of GeneralImageClassifierBase.

The user will call the Update() function to run the classification proces.

The user must generate the membership function before asking for data to be classified. One can automatically generate the membership function from the training data via the use of itkImageModelEstimator class. The membership functions have to be populated by using the AddMembershipFunction. If membership functions are not set prior to calling for classification, an exception in thrown.

The user can have more than one membership function, and can have one for each class. The order of the membership calculator becomes the class label for the class that is represented by the membership calculator.

The fourth argument is the type of decision rule. The main role of a decision rule is comparing the return values of the membership calculators. However, decision rules can include some prior knowledge that can improve the result. To plug in the decision rule, use SetDecisionRule method.

Before the Update method is called to start the classification process, plug in all necessary parts (one or more membership functions, a decision rule, and the unclassified data).

This class is templated over the container type.

Definition at line 86 of file itkClassifierBase.h.


Member Typedef Documentation

template<class TDataContainer>
typedef Statistics::DecisionRule itk::ClassifierBase< TDataContainer >::DecisionRuleType

Type alias for decision rule

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

Definition at line 113 of file itkClassifierBase.h.

template<class TDataContainer>
typedef TDataContainer::ValueType itk::ClassifierBase< TDataContainer >::MeasurementVectorType

Sets the decision rule

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

Definition at line 100 of file itkClassifierBase.h.

template<class TDataContainer>
typedef MembershipFunctionType::Pointer itk::ClassifierBase< TDataContainer >::MembershipFunctionPointer
template<class TDataContainer>
typedef std::vector< MembershipFunctionPointer > itk::ClassifierBase< TDataContainer >::MembershipFunctionPointerVector
template<class TDataContainer>
typedef Statistics::MembershipFunctionBase< MeasurementVectorType > itk::ClassifierBase< TDataContainer >::MembershipFunctionType

Typedefs for membership funciton

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

Definition at line 106 of file itkClassifierBase.h.

template<class TDataContainer>
typedef ClassifierBase itk::ClassifierBase< TDataContainer >::Self

Standard class typedefs.

Reimplemented from itk::LightProcessObject.

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

Definition at line 90 of file itkClassifierBase.h.

template<class TDataContainer>
typedef LightProcessObject itk::ClassifierBase< TDataContainer >::Superclass

Reimplemented from itk::LightProcessObject.

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

Definition at line 91 of file itkClassifierBase.h.


Constructor & Destructor Documentation

template<class TDataContainer>
itk::ClassifierBase< TDataContainer >::ClassifierBase ( ) [protected]
template<class TDataContainer>
itk::ClassifierBase< TDataContainer >::~ClassifierBase ( ) [protected]
template<class TDataContainer>
itk::ClassifierBase< TDataContainer >::ClassifierBase ( const Self ) [private]

Member Function Documentation

template<class TDataContainer>
unsigned int itk::ClassifierBase< TDataContainer >::AddMembershipFunction ( MembershipFunctionType function)

Stores a membership function of a class in its internal vector

template<class TDataContainer>
virtual void itk::ClassifierBase< TDataContainer >::GenerateData ( ) [protected, pure virtual]

The real classification logic implementaion. All the subclasses of this class should implement this method.

Reimplemented from itk::LightProcessObject.

Implemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

template<class TDataContainer>
DecisionRuleType* itk::ClassifierBase< TDataContainer >::GetDecisionRule ( void  ) [inline]

Gets the pointer to the decision rule being used.

Definition at line 124 of file itkClassifierBase.h.

template<class TDataContainer>
const MembershipFunctionType* itk::ClassifierBase< TDataContainer >::GetMembershipFunction ( unsigned int  index) const [inline]

Gets the MembershipFunction that are plugged in by the AddMembershipFunction method. The index is assigned according to the order each membership function has been added using the AddMemberShipFunction method

Definition at line 133 of file itkClassifierBase.h.

template<class TDataContainer>
virtual const char* itk::ClassifierBase< TDataContainer >::GetNameOfClass ( ) const [virtual]

Run-time type information (and related methods).

Reimplemented from itk::LightProcessObject.

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

template<class TDataContainer>
virtual const unsigned int& itk::ClassifierBase< TDataContainer >::GetNumberOfClasses ( ) [virtual]

Gets the number of classes.

template<class TDataContainer>
unsigned int itk::ClassifierBase< TDataContainer >::GetNumberOfMembershipFunctions ( ) [inline]

Gets the number of membership functions

Definition at line 139 of file itkClassifierBase.h.

template<class TDataContainer>
void itk::ClassifierBase< TDataContainer >::operator= ( const Self ) [private]

This method causes the filter to generate its output.

Reimplemented from itk::LightProcessObject.

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

template<class TDataContainer>
void itk::ClassifierBase< TDataContainer >::PrintSelf ( std::ostream &  os,
Indent  indent 
) const [protected, virtual]

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::LightProcessObject.

Reimplemented in itk::ImageClassifierBase< TInputImage, TClassifiedImage >.

template<class TDataContainer>
void itk::ClassifierBase< TDataContainer >::SetDecisionRule ( DecisionRuleType ptrToDecisionRule) [inline]

Sets the pointer to the decision rule. Stores the decision rule that makes the real decision using informations from MembershipFunctions and other prior knowledge

Definition at line 118 of file itkClassifierBase.h.

template<class TDataContainer>
virtual void itk::ClassifierBase< TDataContainer >::SetNumberOfClasses ( unsigned int  _arg) [virtual]

Sets the number of classes.

template<class TDataContainer>
void itk::ClassifierBase< TDataContainer >::Update ( )

Starts the classification process


Member Data Documentation

template<class TDataContainer>
DecisionRuleType::Pointer itk::ClassifierBase< TDataContainer >::m_DecisionRule [private]

Pointer to the decision rule to be used for classification.

Definition at line 167 of file itkClassifierBase.h.

template<class TDataContainer>
MembershipFunctionPointerVector itk::ClassifierBase< TDataContainer >::m_MembershipFunctions [private]

Container to hold the membership functions

Definition at line 170 of file itkClassifierBase.h.

template<class TDataContainer>
unsigned int itk::ClassifierBase< TDataContainer >::m_NumberOfClasses [private]

Number of classes

Definition at line 164 of file itkClassifierBase.h.


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