forward: Extract forward and reverse transformations
Description
These functions extract forward and reverse transformations in a form
compatible with applyTransform and other functions. They are
(S3) generic, but only methods for "niftyreg" objects currently
exist.
Usage
forward(object, ...)
"forward"(object, i = 1, ...)
reverse(object, ...)
"reverse"(object, i = 1, ...)
Arguments
...
Additional arguments. Not currently used.
i
The transformation number to extract. There will only be more than
one in the case of multiple registration.
Value
A transformation object, an image or affine matrix, with suitable
attributes giving pointers to source and target images. If there is no
transformation information in the object then NULL is returned.