#include <itkCenteredTransformInitializer2.h>

Detailed Description

template<class TTransform, class TFixedImage, class TMovingImage>
class itk::CenteredTransformInitializer2< TTransform, TFixedImage, TMovingImage >

CenteredTransformInitializer2 is a helper class intended to initialize the center of rotation and the translation of Transforms having the center of rotation among their parameters.

This class is connected to the fixed image, moving image and transform involved in the registration. Three modes of operation are possible:

Geometrical,
Center of mass,
Origins,
GeometryTop

In the first mode, the geometrical center of the fixed image is passed as initial center of rotation to the transform and the vector from the center of the fixed image to the center of the moving image is passed as the initial translation. This mode basically assumes that the anatomical objects to be registered are centered in their respective images. Hence the best initial guess for the registration is the one that superimposes those two centers.

In the second mode, the moments of gray level values are computed for both images. The center of mass of the moving image is then used as center of rotation. The vector between the two centers of mass is passes as the initial translation to the transform. This second approach assumes that the moments of the anatomical objects are similar for both images and hence the best initial guess for registration is to superimpose both mass centers. Note that this assumption will probably not hold in multi-modality registration.

In the third mode, the vector from the coordinates (0,0,0) of the fixed image to the coordinates (0,0,0) of the moving image is passed as the initial translation T and the geometrical center of the moving image, translated by inv(T), is passed as initial center of rotation to the transform.

In the fourth mode, the world coordinates of the eight corner points of both images are determined. For both images, the minimum of the elements of world coordinates is taken and the initial translation is taken to be the vector pointing from the minimum coordinates of the fixed image to the minimum coordinates of the moving image. The rotation point is set to the center of the fixed image. Note that this method does not make sense for 2D images, in that case the result will be equal to Geometrical method.

Definition at line 92 of file itkCenteredTransformInitializer2.h.

Inheritance diagram for itk::CenteredTransformInitializer2< TTransform, TFixedImage, TMovingImage >:

Public Types
typedef SmartPointer< const Self >	ConstPointer

typedef FixedImageCalculatorType::Pointer	FixedImageCalculatorPointer

typedef AdvancedImageMomentsCalculator< FixedImageType >	FixedImageCalculatorType

typedef FixedImageMaskType::ConstPointer	FixedImageMaskPointer

typedef Image< unsigned char, InputSpaceDimension >	FixedImageMaskType

typedef FixedImageType::ConstPointer	FixedImagePointer

typedef TFixedImage	FixedImageType

typedef FixedImageType::PixelType	InputPixelType

typedef TransformType::InputPointType	InputPointType

typedef MovingImageCalculatorType::Pointer	MovingImageCalculatorPointer

typedef AdvancedImageMomentsCalculator< MovingImageType >	MovingImageCalculatorType

typedef MovingImageMaskType::ConstPointer	MovingImageMaskPointer

typedef Image< unsigned char, OutputSpaceDimension >	MovingImageMaskType

typedef MovingImageType::ConstPointer	MovingImagePointer

typedef TMovingImage	MovingImageType

typedef TransformType::OffsetType	OffsetType

typedef TransformType::OutputVectorType	OutputVectorType

typedef SmartPointer< Self >	Pointer

typedef CenteredTransformInitializer2	Self

typedef Object	Superclass

typedef TransformType::Pointer	TransformPointer

typedef TTransform	TransformType

Public Member Functions
void	GeometryOn ()

void	GeometryTopOn ()

virtual const char *	GetClassName () const

virtual const FixedImageCalculatorType *	GetFixedCalculator ()

virtual const MovingImageCalculatorType *	GetMovingCalculator ()

virtual void	InitializeTransform ()

	itkStaticConstMacro (InputSpaceDimension, unsigned int, TransformType::InputSpaceDimension)

	itkStaticConstMacro (OutputSpaceDimension, unsigned int, TransformType::OutputSpaceDimension)

void	MomentsOn ()

void	OriginsOn ()

virtual void	SetCenterOfGravityUsesLowerThreshold (bool _arg)

virtual void	SetFixedImage (const FixedImageType *_arg)

virtual void	SetFixedImageMask (const FixedImageMaskType *_arg)

virtual void	SetLowerThresholdForCenterGravity (InputPixelType _arg)

virtual void	SetMovingImage (const MovingImageType *_arg)

virtual void	SetMovingImageMask (const MovingImageMaskType *_arg)

virtual void	SetNumberOfSamplesForCenteredTransformInitialization (SizeValueType _arg)

virtual void	SetTransform (TransformType *_arg)

Static Public Member Functions
static Pointer	New ()

Protected Member Functions
	CenteredTransformInitializer2 ()

	itkGetModifiableObjectMacro (Transform, TransformType)

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

	~CenteredTransformInitializer2 () override

Protected Attributes
bool	m_CenterOfGravityUsesLowerThreshold

InputPixelType	m_LowerThresholdForCenterGravity

SizeValueType	m_NumberOfSamplesForCenteredTransformInitialization

Private Member Functions
	CenteredTransformInitializer2 (const Self &)

void	operator= (const Self &)