Resample a nrrd with simple or complex filters

description wraps unu resample

NrrdResample(infile, outfile = NULL, size = NULL, voxdims = NULL,
  centering = c("cell", "node"), otherargs = NULL, gzip = TRUE,
  suffix = NULL, CreateDirs = TRUE, Verbose = TRUE, Force = FALSE,
  UseLock = FALSE, ...)

Arguments

infile, outfile	Input/output files
size	Numeric vector of scale factors (NA=> don't touch) or integer vector of pixel dimensions.
voxdims	Target voxel dimensions
centering	Whether to assume node or cell centering if not specified in input file.
otherargs	Passed to unu resample
gzip	Whether or not to gzip encode the output file?
suffix	A suffix added to the input file to construct an output filename
CreateDirs	Whether to create implied output directories
Verbose	Print status messages
Force	Whether to overwrite an existing file
UseLock	Whether to use file-based locking to enable simple parallelisation
...	Additional params passed to unu

Value

The output file

Details

If outfile is NULL a default filename wil be constructed.

When size is explicitly an integer (e.g. c(512L,512L,100L) then it is assumed to represent the size of the desired output in pixels.

unu resample defaults to cell centering in the asbence of information, but I prefer node.

* downsampling a **cell** image (e.g. x2) will result in

• an origin shift **iff** an origin was specified in the input file

• a change in the space directions that is not an exact multiple of the downsampling factor

.

Downsampling a node image (e.g. x2) will result in:

• no change in origin

• a doubling in the space directions field