#include <itkLandmarkBasedTransformInitializer.h>

Inheritance diagram for itk::LandmarkBasedTransformInitializer< TTransform, TFixedImage, TMovingImage >:

Collaboration diagram for itk::LandmarkBasedTransformInitializer< TTransform, TFixedImage, TMovingImage >:

Detailed Description

template<class TTransform, class TFixedImage, class TMovingImage>
class itk::LandmarkBasedTransformInitializer< TTransform, TFixedImage, TMovingImage >

LandmarkBasedTransformInitializer is a helper class intended to The class computes the transform that aligns the fixed and moving images given a set of landmarks. The class is templated over the Transform type. The transform computed gives the best fit transform that maps the fixed and moving images in a least squares sense. The indices are taken to correspond, so point 1 in the first set will get mapped close to point 1 in the second set, etc. An equal number of fixed and moving landmarks need to be specified using SetFixedLandmarks() SetMovingLandmarks(). Any number of landmarks may be specified. Call InitializeTransform() to initialize the transform.

Currently, the following transforms are supported by the class: VersorRigid3DTransform Rigid2DTransform

The class is based in part on Hybrid/vtkLandmarkTransform originally implemented in python by David G. Gobbi.

The solution is based on Berthold K. P. Horn (1987), "Closed-form solution of absolute orientation using unit quaternions," http://people.csail.mit.edu/bkph/papers/Absolute_Orientation.pdf

The Affine Transform initializer is based on an algorithm by H Spaeth, and is described in the Insight Journal Article "Affine Transformation for Landmark Based Registration Initializer in ITK" by Kim E.Y., Johnson H., Williams N. available at http://midasjournal.com/browse/publication/825

Wiki Examples:

All Examples

Rigidly register one image to another using manually specified landmarks

Definition at line 70 of file itkLandmarkBasedTransformInitializer.h.

Public Types
typedef AffineTransform < ParameterValueType, FixedImageType::ImageDimension >	AffineTransformType

typedef SmartPointer< const Self >	ConstPointer

typedef FixedImageType::ConstPointer	FixedImagePointer

typedef TFixedImage	FixedImageType

typedef TransformType::InputPointType	InputPointType

typedef std::vector < LandmarkPointType >	LandmarkPointContainer

typedef Point< double, itkGetStaticConstMacro(ImageDimension) >	LandmarkPointType

typedef LandmarkWeightType::const_iterator	LandmarkWeightConstIterator

typedef std::vector< double >	LandmarkWeightType

typedef MovingImageType::ConstPointer	MovingImagePointer

typedef TMovingImage	MovingImageType

typedef TransformType::OutputVectorType	OutputVectorType

typedef TransformType::ParametersType	ParametersType

typedef ParametersType::ValueType	ParameterValueType

typedef SmartPointer< Self >	Pointer

typedef LandmarkPointContainer::const_iterator	PointsContainerConstIterator

typedef Rigid2DTransform < ParameterValueType >	Rigid2DTransformType

typedef LandmarkBasedTransformInitializer	Self

typedef Object	Superclass

typedef TransformType::Pointer	TransformPointer

typedef TTransform	TransformType

typedef VersorRigid3DTransform < ParameterValueType >	VersorRigid3DTransformType

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 (void) const

virtual const char *	GetNameOfClass () const

virtual void	InitializeTransform ()

void	SetFixedLandmarks (const LandmarkPointContainer &fixedLandmarks)

void	SetLandmarkWeight (LandmarkWeightType &landmarkWeight)

void	SetMovingLandmarks (const LandmarkPointContainer &movingLandmarks)

virtual void	SetTransform (TransformType *_arg)

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

Static Public Member Functions
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 ()

Static Public Attributes
static const unsigned int	ImageDimension = FixedImageType::ImageDimension


static const unsigned int	InputSpaceDimension = TransformType::InputSpaceDimension

static const unsigned int	OutputSpaceDimension = TransformType::OutputSpaceDimension

Protected Types
enum	InputTransformType { VersorRigid3Dtransform = 1, Rigid2Dtransfrom, Else }

Protected Member Functions
	LandmarkBasedTransformInitializer ()

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

	~LandmarkBasedTransformInitializer ()

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
template<class TTransform2 >
void	InternalInitializeTransform (TTransform *)

void	InternalInitializeTransform (VersorRigid3DTransformType *)

void	InternalInitializeTransform (Rigid2DTransformType *)

void	InternalInitializeTransform (AffineTransformType *)

	LandmarkBasedTransformInitializer (const Self &)

void	operator= (const Self &)

Private Attributes
FixedImagePointer	m_FixedImage

LandmarkPointContainer	m_FixedLandmarks

LandmarkWeightType	m_LandmarkWeight

MovingImagePointer	m_MovingImage

LandmarkPointContainer	m_MovingLandmarks

TransformPointer	m_Transform

Additional Inherited Members
Protected Attributes inherited from itk::LightObject
InternalReferenceCountType	m_ReferenceCount

SimpleFastMutexLock	m_ReferenceCountLock