fitTimeVaryingTransformToPointSets: fitTimeVaryingTransformToPointSets
In stnava/ANTsR: ANTs in R: Quantification Tools for Biomedical Images

fitTimeVaryingTransformToPointSets

R Documentation

fitTimeVaryingTransformToPointSets

Description

Estimate a time-varying transform from corresponding point sets (> 2).

Usage

fitTimeVaryingTransformToPointSets(
  pointSets,
  timePoints = NULL,
  initialVelocityField = NULL,
  numberOfTimeSteps = NULL,
  domainImage = NULL,
  numberOfFittingLevels = 4,
  meshSize = 1,
  splineOrder = 3,
  displacementWeights = NULL,
  numberOfCompositions = 10,
  compositionStepSize = 0.5,
  numberOfIntegrationSteps = 100,
  sigma = 0,
  convergenceThreshold = 0.000001,
  rasterizePoints = FALSE,
  verbose = FALSE
)

Arguments

`pointSets`	Corresponding points across sets specified in physical space as a `n x d` matrix where `n` is the number of points and `d` is the dimensionality.
`timePoints`	Set of scalar values, one for each point-set designating its time position in the velocity flow. If not set, it defaults to equal spacing between 0 and 1.
`initialVelocityField`	Optional velocity field for initializing optimization. Overrides the number of integration points.
`numberOfTimeSteps`	Time-varying velocity field parameter. Needs to be equal to or greater than the number of point sets. If not specified, it defaults to the number of point sets.
`domainImage`	Defines physical domain of the B-spline transform. Must be defined for nonlinear transforms.
`numberOfFittingLevels`	Integer specifying the number of fitting levels for the B-spline interpolation of the displacement field.
`meshSize`	Defines the mesh size at the initial fitting level for the B-spline interpolation of the displacement field.
`splineOrder`	Spline order of the B-spline displacement field.
`displacementWeights`	vector defining the individual weighting of the corresponding scattered data value. Default = NULL meaning all displacements are weighted the same.
`numberOfCompositions`	Total number of compositions for the diffeomorphic transform.
`compositionStepSize`	Scalar multiplication factor of the weighting of the update field for the diffeomorphic transforms.
`numberOfIntegrationSteps`	Number of steps used for integrating the velocity field.
`sigma`	Gaussian smoothing standard deviation of the update field (in mm).
`convergenceThreshold`	Composition-based convergence parameter for the diffeomorphic transforms using a window size of 10 values.
`rasterizePoints`	Use nearest neighbor rasterization of points for estimating update field (potential speed-up).
`verbose`	Print progress to the screen.