4D space-time TV (ROF) denoising via Chambolle-Pock — stv_denoise4d • fmrismooth

Performs anisotropic total variation denoising in space and time.

Usage

stv_denoise4d(
  vec,
  lambda_s = 0.8,
  lambda_t = 0.2,
  iters = 30L,
  mask = NULL,
  tau = NULL,
  sigma = NULL,
  theta = 1
)

Arguments

vec: 4D fMRI array or `NeuroVec`.
lambda_s: Spatial TV weight.
lambda_t: Temporal TV weight.
iters: Number of primal-dual iterations (positive integer).
mask: Optional 3D logical/0-1 mask.
tau: Algorithm primal step size; if `NULL`, a sensible default is used.
sigma: Algorithm dual step size; if `NULL`, a sensible default is used.
theta: Over-relaxation parameter.

Value

Smoothed 4D data, wrapped like `vec` when possible.