[Insight-users] questions about affine registration
Michael Schildt
michael.schildt at ifn-magdeburg.de
Mon Jul 16 04:07:32 EDT 2007
Hello Everybody!
I'm new to the toolkit and started using the ITK for registration of
inter-modal, intra-subject 3D MRI datasets. I worked through the
examples delivered with the software. I tried to make my own programm
based on one example to make a centered affine 3D transform and perform
registration using MattesMI, linear interpolation and
RegularStepGradientDescent and results aren't satisfying . The tranform
was initialized via TransformInitializer using the moments of both
datasets. Maybe still some understanding problems remained for me:
1) What is optimizer->SetScale() really doing?
As far as I understood it helps me to make parameters of the transform
beeing in the same number range for optimization. So setting it to
values smaller
one for that parameter it will make smaller otimization steps? What
happens if the value is zero. I thought will fix this parameter, but it
didn't. :-/
2) What is the Method transform->SetFixedParameters() for? The
documentation just says, it fixes the parameter. :-(
I want to fix some of the parameters for the registration, making a
scaling as first step, followed by complete affine transform. Can I do
this with with one of above mention methods?
Best regards,
M. Schildt
More information about the Insight-users
mailing list