[Insight-users] Registration

[Lydia Ng]

Hi David,

> (2)  V&W MI doesn't work when I go to a transform with
> more parameters.  Euler3D and Quaternion don't work
> regardless of the parameters I set.    Messing with
> the scales doesn't help much.  Often I get the "mapped
> outside" error.  I can't comment on the spacing
> problem because I cannot get a consistent correct
> answer.

Is your testing code ITK only? If so, would you mind posting it so that
we have a common test platform to at this problem with? Also, what type
of images are you using and are they sharable too?

- Lydia

> -----Original Message-----
> From: David Holmes [mailto:holmesd3 at yahoo . com]
> Sent: Tuesday, July 29, 2003 2:53 PM
> To: insight-users at public . kitware . com
> Subject: [Insight-users] Registration
>=20
>=20
> Well, I have been playing with registration some more
> and had little success.  Here is what I have come
> across:
>=20
> (1)  Because of problems with the meanssquared metric,
> I moved on to the MI metric.
>=20
> V&W MI work with the translation transform.  I did not
> have any problems for a variety of mis-alignments with
> a variety of scales. (Used ImageRegistration2.cxx)
>=20
> (2)  V&W MI doesn't work when I go to a transform with
> more parameters.  Euler3D and Quaternion don't work
> regardless of the parameters I set.    Messing with
> the scales doesn't help much.  Often I get the "mapped
> outside" error.  I can't comment on the spacing
> problem because I cannot get a consistent correct
> answer.
>=20
> For what it is worth, I am not a big fan of the
> optimizer because even when it gets a near optimal
> cost value, it runs away from it.  That is a real
> challenge.
>=20
> Thanks
>=20
> David
>=20
>=20
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