[Insight-users] A problem about registration

[Atwood, Robert C]

I am a fellow user of the 3d registration tools, here is my advice. I am not as much of an expert as the developers, but I had a similar problem which has been fixed.

I had a problem with the versor rigid 3d transform a while ago, and it was fixed once I checked out the latest source code from the CVS repository; there was a bug in that subroutine and the fix was checked in by Luis on 2004/07/04. If you source code is older than this, I suspect the same cause. I have had good results with VersorRigid3Dtransform  since updataing the source and rebuilding ITK. (however, I am using 'NormalizedCorrelationImageToImageMetric' rather than the one you are using)

If you already have the latest CVS source, then I have to defer to someone more expert.


Robert



(from CVS log)

revision 1.21
date: 2004/07/04 18:05:34;  author: ibanez;  state: Exp;  lines: +29 -15
FIX: Jacobian computation has been fixed. It now ensures that the Versor
     differential respect the unit magnitude constraint.
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-----Original Message-----
From: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] On Behalf Of caojie8224 at 163.com
Sent: 09 August 2004 08:22
To: insight-users at itk.org
Subject: [Insight-users] A problem about registration 






Dear Mr. or Ms.
     I had a problem when I carried out the 3D multi-registration using the Mattes MRI metric. First, I chose the "Versor Rigid 3D Transformation".But the 
result turned out wrong.Then I changed the transformation to "Euler 3D Transformation".The result got right .However,it iterated too many times. So I use the CenteredTransformInitializer to make the center of mass of the two images together. Since the EulerTransformation didn't have the function to set the center of rotation, the result got wrong. Now I don't know which transformation to choose and what  to be careful of. Can you help me to figure out the problems.Thank you!

Sincerely!
                                                           A itk user  CaoJie 

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