[Insight-users] Initial vector field for deformable registration

[Jochen Cammin]

Should I take the silence on this subject as a sign that it is not 
possible to initialize the parameters of an optimizer other than zero?

Thank you,
Jochen


Jochen Cammin wrote:
> Hello,
> 
> I'm fairly new to ITK and want to use it for 4D image registration. I
> modified the example DeformableRegistration2 to my needs (changing the
> dimension from 2 to 4) and it works well.
> 
> I assume that the initial deformation parameters are all set to 0. In my
> case, however, I do have an estimate for the initial deformation in
> terms of an initial motion vector field (a 3D image with vectors as
> pixel types). Is it possible to initialize the deformation with this
> vector field?
> 
> I saw that other examples (like DeformableRegistration7) explicitly
> initialize the deformation parameters with zeros by calling
> parameters.Fill( 0.0 ). But it is not obvious to me how I would
> translate the vector field into deformation parameters.
> 
> Thank you,
> Jochen
> 
> 
> 
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