Detailed Description

Implement a gradient descent optimizer.

VersorTransformOptimizer is a variant of the gradient descent optimizer implmented in RegularStepGradientDescentOptimizer.

Versors are not in a vector space, for that reason, the classical gradient descent algorithm has to be modified in order to be applicable to Versors (unit quaternions) that form the group SO(3).

The Versor space has only three degrees of freedom, even though Versors are represented using four values.

This optimizer assumes that the CostFunction to be optimized has an itk::Versor as parameter.

See Also: RegularStepGradientDescentOptimizer; Versor; VersorTransform

Definition at line 52 of file itkVersorTransformOptimizer.h.

Public Types
typedef SmartPointer< const Self >	ConstPointer

typedef SmartPointer< Self >	Pointer

typedef VersorTransformOptimizer	Self

typedef RegularStepGradientDescentBaseOptimizer	Superclass

typedef VersorType::VectorType	VectorType

typedef Versor< double >	VersorType

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

typedef SmartPointer< Self >	Pointer

typedef RegularStepGradientDescentBaseOptimizer	Self

enum	StopConditionType { GradientMagnitudeTolerance = 1, StepTooSmall = 2, ImageNotAvailable = 3, CostFunctionError = 4, MaximumNumberOfIterations = 5, Unknown = 6 }

typedef SingleValuedNonLinearOptimizer	Superclass

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

typedef CostFunctionType::Pointer	CostFunctionPointer

typedef SingleValuedCostFunction	CostFunctionType

typedef CostFunctionType::DerivativeType	DerivativeType

typedef CostFunctionType::MeasureType	MeasureType

typedef Superclass::ParametersType	ParametersType

typedef SmartPointer< Self >	Pointer

typedef SingleValuedNonLinearOptimizer	Self

typedef NonLinearOptimizer	Superclass

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

typedef Superclass::ParametersType	ParametersType

typedef SmartPointer< Self >	Pointer

typedef Superclass::ScalesType	ScalesType

typedef NonLinearOptimizer	Self

typedef Optimizer	Superclass

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

typedef OptimizerParameters < double >	ParametersType

typedef SmartPointer< Self >	Pointer

typedef Array< double >	ScalesType

typedef Optimizer	Self

typedef Object	Superclass

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

virtual const char *	GetNameOfClass () const

virtual void	StepAlongGradient (double factor, const DerivativeType &transformedGradient) override

Public Member Functions inherited from itk::RegularStepGradientDescentBaseOptimizer
virtual const std::string	GetStopConditionDescription () const override

void	ResumeOptimization ()

virtual void	StartOptimization (void) override

void	StopOptimization ()

virtual void	SetMaximize (bool _arg)

virtual const bool &	GetMaximize () const

virtual void	MaximizeOn ()

virtual void	MaximizeOff ()

bool	GetMinimize () const

void	SetMinimize (bool v)

void	MinimizeOn (void)

void	MinimizeOff (void)

virtual void	SetMaximumStepLength (double _arg)

virtual void	SetMinimumStepLength (double _arg)

virtual void	SetRelaxationFactor (double _arg)

virtual void	SetNumberOfIterations (SizeValueType _arg)

virtual void	SetGradientMagnitudeTolerance (double _arg)

virtual const double &	GetCurrentStepLength () const

virtual const double &	GetMaximumStepLength () const

virtual const double &	GetMinimumStepLength () const

virtual const double &	GetRelaxationFactor () const

virtual const SizeValueType &	GetNumberOfIterations () const

virtual const double &	GetGradientMagnitudeTolerance () const

virtual unsigned int	GetCurrentIteration () const

virtual const StopConditionType &	GetStopCondition () const

virtual const MeasureType &	GetValue () const

virtual const DerivativeType &	GetGradient () const

Public Member Functions inherited from itk::SingleValuedNonLinearOptimizer
virtual const CostFunctionType *	GetCostFunction () const

virtual CostFunctionType *	GetModifiableCostFunction ()

MeasureType	GetValue (const ParametersType &parameters) const

virtual void	SetCostFunction (CostFunctionType *costFunction)

Public Member Functions inherited from itk::Optimizer
virtual const ParametersType &	GetCurrentPosition () const

virtual const ParametersType &	GetInitialPosition () const

virtual void	SetInitialPosition (const ParametersType &param)

void	SetScales (const ScalesType &scales)

virtual const ScalesType &	GetScales () const

virtual const ScalesType &	GetInverseScales () const

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 ()

const MetaDataDictionary &	GetMetaDataDictionary () 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 override

void	RemoveAllObservers ()

void	RemoveObserver (unsigned long tag)

void	SetDebug (bool debugFlag) const

void	SetMetaDataDictionary (const MetaDataDictionary &rhs)

virtual void	SetReferenceCount (int) override

virtual void	UnRegister () const noexceptoverride

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

Static Public Member Functions
static Pointer	New ()

Static Public Member Functions inherited from itk::RegularStepGradientDescentBaseOptimizer
static Pointer	New ()

Static Public Member Functions inherited from itk::SingleValuedNonLinearOptimizer
static Pointer	New ()

Static Public Member Functions inherited from itk::NonLinearOptimizer
static Pointer	New ()

Static Public Member Functions inherited from itk::Optimizer
static Pointer	New ()

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 Member Functions
	VersorTransformOptimizer ()

virtual	~VersorTransformOptimizer () override

Protected Member Functions inherited from itk::RegularStepGradientDescentBaseOptimizer
virtual void	AdvanceOneStep ()

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

	RegularStepGradientDescentBaseOptimizer ()

virtual void	StepAlongGradient (double, const DerivativeType &)

virtual	~RegularStepGradientDescentBaseOptimizer () override

Protected Member Functions inherited from itk::SingleValuedNonLinearOptimizer
	SingleValuedNonLinearOptimizer ()

virtual	~SingleValuedNonLinearOptimizer () override

Protected Member Functions inherited from itk::NonLinearOptimizer
	NonLinearOptimizer ()

virtual	~NonLinearOptimizer () override

Protected Member Functions inherited from itk::Optimizer
	Optimizer ()

virtual void	SetCurrentPosition (const ParametersType &param)

virtual	~Optimizer () override

Protected Member Functions inherited from itk::Object
	Object ()

bool	PrintObservers (std::ostream &os, Indent indent) const

virtual void	SetTimeStamp (const TimeStamp &time)

virtual	~Object () override

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 ()

Additional Inherited Members
Protected Attributes inherited from itk::RegularStepGradientDescentBaseOptimizer
SizeValueType	m_CurrentIteration

double	m_CurrentStepLength

DerivativeType	m_Gradient

double	m_GradientMagnitudeTolerance

bool	m_Maximize

double	m_MaximumStepLength

double	m_MinimumStepLength

SizeValueType	m_NumberOfIterations

DerivativeType	m_PreviousGradient

double	m_RelaxationFactor

bool	m_Stop

StopConditionType	m_StopCondition

std::ostringstream	m_StopConditionDescription

MeasureType	m_Value

Protected Attributes inherited from itk::SingleValuedNonLinearOptimizer
CostFunctionPointer	m_CostFunction

Protected Attributes inherited from itk::Optimizer
ParametersType	m_CurrentPosition

bool	m_ScalesInitialized

Protected Attributes inherited from itk::LightObject
AtomicInt< int >	m_ReferenceCount

Member Typedef Documentation

typedef SmartPointer< const Self > itk::VersorTransformOptimizer::ConstPointer

Definition at line 60 of file itkVersorTransformOptimizer.h.

typedef SmartPointer< Self > itk::VersorTransformOptimizer::Pointer

Definition at line 59 of file itkVersorTransformOptimizer.h.

typedef VersorTransformOptimizer itk::VersorTransformOptimizer::Self

Standard class typedefs.

Definition at line 57 of file itkVersorTransformOptimizer.h.

typedef RegularStepGradientDescentBaseOptimizer itk::VersorTransformOptimizer::Superclass

Definition at line 58 of file itkVersorTransformOptimizer.h.

typedef VersorType::VectorType itk::VersorTransformOptimizer::VectorType

Definition at line 71 of file itkVersorTransformOptimizer.h.

typedef Versor< double > itk::VersorTransformOptimizer::VersorType

Versor Type

Definition at line 67 of file itkVersorTransformOptimizer.h.

Constructor & Destructor Documentation

itk::VersorTransformOptimizer::VersorTransformOptimizer ( )

inlineprotected

Definition at line 78 of file itkVersorTransformOptimizer.h.

virtual itk::VersorTransformOptimizer::~VersorTransformOptimizer ( )

inlineoverrideprotectedvirtual

Definition at line 79 of file itkVersorTransformOptimizer.h.

Member Function Documentation

virtual::itk::LightObject::Pointer itk::VersorTransformOptimizer::CreateAnother ( ) 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::RegularStepGradientDescentBaseOptimizer.

virtual const char* itk::VersorTransformOptimizer::GetNameOfClass ( ) const

virtual

Run-time type information (and related methods).

Reimplemented from itk::RegularStepGradientDescentBaseOptimizer.

static Pointer itk::VersorTransformOptimizer::New ( )

static

Method for creation through the object factory.