fslerode: Erode image using FSL

In fslr: Wrapper Functions for 'FSL' ('FMRIB' Software Library) from Functional MRI of the Brain ('FMRIB')

Erode image using FSL

Description

This function calls fslmaths -ero to erode an image with either the default FSL kernel or the kernel specified in kopts. The function either saves the image or returns an object of class nifti.

Usage

fsl_erode(..., outfile = tempfile(fileext = ".nii.gz"), retimg = FALSE)

fslerode(
  file,
  outfile = NULL,
  retimg = TRUE,
  reorient = FALSE,
  intern = FALSE,
  kopts = "",
  opts = "",
  verbose = TRUE,
  ...
)

Arguments

...	additional arguments passed to readnii.
outfile	(character) resultant eroded image name
retimg	(logical) return image of class nifti
file	(character) image to be eroded
reorient	(logical) If retimg, should file be reoriented when read in? Passed to readnii.
intern	(logical) to be passed to system
kopts	(character) options for kernel
opts	(character) additional options to be passed to fslmaths
verbose	(logical) print out command before running

Value

Result from system command, depends if intern is TRUE or FALSE. If retimg is TRUE, then the image will be returned.

Note

Functions with underscores have different defaults and will return an output filename, so to be used for piping

Examples

if (have.fsl()){
system.time({
dims = c(50, 50, 20)
x = array(rnorm(prod(dims)), dim = dims) 
img = nifti(x, dim= dims, 
datatype = convert.datatype()$FLOAT32, cal.min = min(x), 
cal.max = max(x), pixdim = rep(1, 4))
mask = img > .5
eroded = fslerode(mask, kopts = "-kernel boxv 5", retimg=TRUE)
})
}    

fslr documentation built on May 29, 2024, 2:31 a.m.