[Insight-users] regid transformation matrix

[Henry]

Hi Ruben,
Thanks for your reply.  I noticed it too but I am wondering why it is
not antisymmetric...

Henry

On 9/28/07, Ruben Schilling <r.b.schilling at googlemail.com> wrote:
> Henry,
>
> take another look at e.g. your row vectors: They are approx. (1,0,0),
> (0,1,0), (0,0,1), which is orthogonal. Remember, that you are working
> with floating point arithmetic on a real computer and ITK is not
> based on symbolical computations.
>
> Regards
> Ruben
>
>
> Am 28.09.2007 um 18:11 schrieb Henry:
>
> > Hi I am using "LandmarkInitializedMutualInformationRegistration" from
> > InsightApplications-3.4.0 and I have one question about the
> > transformation matrix from registration results: although I choose
> > rigid transformation, the transformation matrix are not seemed to be
> > orthogonal, for example:
> > 0.999982 0.00137216 -0.00581659
> > -0.00133902 0.999983 0.0056975
> > 0.00582431 -0.00568961 0.999967
> >
> > I guess it is because affine transformation is used even for rigid
> > registration? How to use rigid transformation instead?
> >
> > Thanks!
> > Henry
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>
>