vtkProcrustesAlignmentFilter Class Reference

#include <vtkProcrustesAlignmentFilter.h>

Inheritance diagram for vtkProcrustesAlignmentFilter:

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Collaboration diagram for vtkProcrustesAlignmentFilter:

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List of all members.

Detailed Description

aligns a set of pointsets together

vtkProcrustesAlignmentFilter is a filter that takes a set of pointsets (any object derived from vtkPointSet) and aligns them in a least-squares sense to their mutual mean. The algorithm is iterated until convergence, as the mean must be recomputed after each alignment.

Call SetNumberOfInputs(n) before calling SetInput(0) ... SetInput(n-1).

Retrieve the outputs using GetOutput(0) ... GetOutput(n-1).

The default (in vtkLandmarkTransform) is for a similarity alignment. For a rigid-body alignment (to build a 'size-and-shape' model) use:

GetLandmarkTransform()->SetModeToRigidBody().

Affine alignments are not normally used but are left in for completeness:

GetLandmarkTransform()->SetModeToAffine().

vtkProcrustesAlignmentFilter is an implementation of:

J.C. Gower (1975) Generalized Procrustes Analysis. Psychometrika, 40:33-51.

Warning:: All of the input pointsets must have the same number of points.

Thanks:: Tim Hutton and Rasmus Paulsen who developed and contributed this class

See also:: vtkLandmarkTransform

Examples:: vtkProcrustesAlignmentFilter (Examples)

Tests:: vtkProcrustesAlignmentFilter (Tests)

Definition at line 67 of file vtkProcrustesAlignmentFilter.h.


Public Types
typedef vtkPointSetAlgorithm	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	SetNumberOfInputs (int n)
vtkPointSet *	GetInput (int idx)

virtual vtkLandmarkTransform *	GetLandmarkTransform ()

virtual vtkPoints *	GetMeanPoints ()

void	SetInput (int idx, vtkPointSet *p)
void	SetInput (int idx, vtkDataObject *input)

virtual void	SetStartFromCentroid (bool)
virtual bool	GetStartFromCentroid ()
virtual void	StartFromCentroidOn ()
virtual void	StartFromCentroidOff ()
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkProcrustesAlignmentFilter *	SafeDownCast (vtkObject *o)
static vtkProcrustesAlignmentFilter *	New ()
Protected Member Functions
	vtkProcrustesAlignmentFilter ()
	~vtkProcrustesAlignmentFilter ()
virtual int	RequestData (vtkInformation , vtkInformationVector , vtkInformationVector )
virtual int	FillInputPortInformation (int port, vtkInformation *info)
Protected Attributes
vtkLandmarkTransform *	LandmarkTransform
bool	StartFromCentroid
vtkPoints *	MeanPoints

Member Typedef Documentation

typedef vtkPointSetAlgorithm vtkProcrustesAlignmentFilter::Superclass

Reimplemented from vtkPointSetAlgorithm.

Definition at line 70 of file vtkProcrustesAlignmentFilter.h.

Constructor & Destructor Documentation

vtkProcrustesAlignmentFilter::vtkProcrustesAlignmentFilter ( ) [protected]

vtkProcrustesAlignmentFilter::~vtkProcrustesAlignmentFilter ( ) [protected]

Member Function Documentation

virtual const char* vtkProcrustesAlignmentFilter::GetClassName ( ) [virtual]

Reimplemented from vtkPointSetAlgorithm.

static int vtkProcrustesAlignmentFilter::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkPointSetAlgorithm.

virtual int vtkProcrustesAlignmentFilter::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkPointSetAlgorithm.

static vtkProcrustesAlignmentFilter* vtkProcrustesAlignmentFilter::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkPointSetAlgorithm.

void vtkProcrustesAlignmentFilter::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Prints information about the state of the filter.

Reimplemented from vtkPointSetAlgorithm.

static vtkProcrustesAlignmentFilter* vtkProcrustesAlignmentFilter::New ( ) [static]

Creates with similarity transform.

Reimplemented from vtkPointSetAlgorithm.

virtual vtkLandmarkTransform* vtkProcrustesAlignmentFilter::GetLandmarkTransform ( ) [virtual]

Get the internal landmark transform. Use it to constrain the number of degrees of freedom of the alignment (i.e. rigid body, similarity, etc.). The default is a similarity alignment.

virtual vtkPoints* vtkProcrustesAlignmentFilter::GetMeanPoints ( ) [virtual]

Get the estimated mean point cloud

void vtkProcrustesAlignmentFilter::SetNumberOfInputs ( int n )

Specify how many pointsets are going to be given as input.

void vtkProcrustesAlignmentFilter::SetInput	(	int	idx,
		vtkPointSet *	p
	)

Specify the input pointset with index idx. Call SetNumberOfInputs before calling this function.

Reimplemented from vtkPointSetAlgorithm.

void vtkProcrustesAlignmentFilter::SetInput	(	int	idx,
		vtkDataObject *	input
	)

Specify the input pointset with index idx. Call SetNumberOfInputs before calling this function.

Reimplemented from vtkPointSetAlgorithm.

virtual void vtkProcrustesAlignmentFilter::SetStartFromCentroid ( bool ) [virtual]

When on, the initial alignment is to the centroid of the cohort curves. When off, the alignment is to the centroid of the first input. Default is off for backward compatibility.

virtual bool vtkProcrustesAlignmentFilter::GetStartFromCentroid ( ) [virtual]

When on, the initial alignment is to the centroid of the cohort curves. When off, the alignment is to the centroid of the first input. Default is off for backward compatibility.

virtual void vtkProcrustesAlignmentFilter::StartFromCentroidOn ( ) [virtual]

When on, the initial alignment is to the centroid of the cohort curves. When off, the alignment is to the centroid of the first input. Default is off for backward compatibility.

virtual void vtkProcrustesAlignmentFilter::StartFromCentroidOff ( ) [virtual]

When on, the initial alignment is to the centroid of the cohort curves. When off, the alignment is to the centroid of the first input. Default is off for backward compatibility.

vtkPointSet* vtkProcrustesAlignmentFilter::GetInput ( int idx )

Retrieve the input point set with index idx (usually only for pipeline tracing).

virtual int vtkProcrustesAlignmentFilter::RequestData	(	vtkInformation *	,
		vtkInformationVector **	,
		vtkInformationVector *
	)			`[protected, virtual]`

Usual data generation method.

Reimplemented from vtkPointSetAlgorithm.

virtual int vtkProcrustesAlignmentFilter::FillInputPortInformation	(	int	port,
		vtkInformation *	info
	)			`[protected, virtual]`

Fill the input port information objects for this algorithm. This is invoked by the first call to GetInputPortInformation for each port so subclasses can specify what they can handle.

Reimplemented from vtkPointSetAlgorithm.