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Combining Transforms in ITK

Klein, Stefan, Staring, Marius
Leiden University Medical Center
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Please use this identifier to cite or link to this publication: http://hdl.handle.net/1926/197
New: Prefer using the following doi: https://doi.org/10.54294/yozmkm
Published in The Insight Journal - 2006 January - June.
Submitted by Marius Staring on 2006-05-22T11:03:01Z.

The current ITK release 2.6 does not contain a way to combine transforms in a structural way. This document describes a contribution to the Insight Toolkit ITK \url{www.itk.org}, which implements what we call an \doxygen{CombinationTransform}. Two ways to combine transforms are implemented, by addition and by composition. Depending on this selection, different implementations of the \code{TransformPoint()} are provided. Also the expressions for the Jacobian and the inverse transform depend on the way transforms are combined. By using function pointers expensive \code{if}-statements are avoided. This paper is accompanied with the source code.