Good point - we've just added a link to the course site on the FSL intro
page now.
Cheers.
On Mon, 6 Dec 2004, Martin Kavec wrote:
> Mark/Steve
>
> thanks for insight into the FLIRT implementation. I can understant it better
> now.
>
> I have one practical comment. I very much appreciate the collection of
> lectures you have on the FSL web-page. However, I was not aware of it until
> Christian put it into my attention in reply to this thread. I didn't think of
> looking for it in FAQ. What would you think of placing a "Documentation" link
> on the web-page which would point also to the lectures.
>
> Cheers.
>
> Martin
>
> On Saturday 04 December 2004 10:45, Mark Jenkinson wrote:
> > Hi,
> >
> > Steve is right - the 7th DOF is a global scaling.
> >
> > I also wanted to add that quaternions do not specify
> > what kind of transformation you are applying - they are
> > a way of representing angles, much in the same way as
> > Euler angles are. Hence you need to know more about
> > what they mean in ITK by a "Quaternian3DTransform".
> > If you hadn't said, I would have assumed that this would
> > be a rigid-body transformation as it is a standard
> > convention to use quaternions to represent rotations
> > alone, and so this plus translations would give a 6 dof
> > rigid-body transformation. My guess is that any 7 dof
> > transformation (using quaternions or not) is probably
> > the same as ours: rigid-body + global scaling. But you
> > should double check this with any available ITK information.
> >
> > All the best,
> > Mark
> >
>
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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