RNiftyReg: readAffine – R documentation

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readAffine

Read an affine matrix from a file

Description

This function is used to read a 4x4 numeric matrix representing an affine transformation from a file. It is a wrapper around read.table which additionally ensures that required attributes are set. The type of the matrix must be specified, as there are differing conventions across software packages.

Usage

readAffine(fileName, source = NULL, target = NULL, type = NULL)

Arguments

`fileName`	A string giving the file name to read the affine matrix from.
`source`	The source image for the transformation. If `NULL`, the file will be searched for a comment specifying the path to a NIfTI file.
`target`	The target image for the transformation. If `NULL`, the file will be searched for a comment specifying the path to a NIfTI file.
`type`	The type of the affine matrix, which describes what convention is it is stored with. Currently valid values are `"niftyreg"` and `"fsl"` (for FSL FLIRT). If `NULL`, the function will look in the file for a comment specifying the type.

Value

An matrix with class "affine", converted to the NiftyReg convention and with source and target attributes set appropriately.

Author(s)

Jon Clayden <code@clayden.org>

Examples

print(readAffine(system.file("extdata","affine.txt",package="RNiftyReg")))

RNiftyReg

Image Registration Using the 'NiftyReg' Library

v2.7.0

GPL-2

Authors

Jon Clayden [cre, aut] (<https://orcid.org/0000-0002-6608-0619>), Marc Modat [aut], Benoit Presles [aut], Thanasis Anthopoulos [aut], Pankaj Daga [aut]

Initial release

2020-09-10