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Program: Visualization Toolkit
Module: vtkProcrustesAlignmentFilter.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME vtkProcrustesAlignmentFilter - aligns a set of pointsets together
// .SECTION Description
// 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.
// .SECTION Caveats
// All of the input pointsets must have the same number of points.
// .SECTION Thanks
// Tim Hutton and Rasmus Paulsen who developed and contributed this class
// .SECTION See Also
// vtkLandmarkTransform
#ifndef __vtkProcrustesAlignmentFilter_h
#define __vtkProcrustesAlignmentFilter_h
#include "vtkPointSetAlgorithm.h"
class vtkLandmarkTransform;
class vtkPointSet;
class vtkPoints;
class VTK_HYBRID_EXPORT vtkProcrustesAlignmentFilter : public vtkPointSetAlgorithm
// Description:
// Prints information about the state of the filter.
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Creates with similarity transform.
static vtkProcrustesAlignmentFilter *New();
// Description:
// 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.
// Description:
// Get the estimated mean point cloud
// Description:
// Specify how many pointsets are going to be given as input.
void SetNumberOfInputs(int n);
// Description:
// Specify the input pointset with index idx.
// Call SetNumberOfInputs before calling this function.
void SetInput(int idx, vtkPointSet* p);
void SetInput(int idx, vtkDataObject* input);
// Description:
// 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.
vtkSetMacro(StartFromCentroid, bool);
vtkGetMacro(StartFromCentroid, bool);
vtkBooleanMacro(StartFromCentroid, bool);
// Description:
// Retrieve the input point set with index idx (usually only for pipeline
// tracing).
vtkPointSet* GetInput(int idx);
// Description:
// Usual data generation method.
virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
virtual int FillInputPortInformation(int port, vtkInformation *info);
vtkLandmarkTransform *LandmarkTransform;
bool StartFromCentroid;
vtkPoints *MeanPoints;
vtkProcrustesAlignmentFilter(const vtkProcrustesAlignmentFilter&); // Not implemented.
void operator=(const vtkProcrustesAlignmentFilter&); // Not implemented.