[Insight-users] about MIThinPlateSplineRegistrator

[Luis Ibanez]

Hi Zhang,

The Set/Get Parameters methods have been
added to the itkKernelTransform class.

Please do a cvs update in order to get these
modifications.

The parameters are simply the sequence of
coordinates components of the landmarks on
the source space.

A registration method will require (as you
said) to initialize the transform by providing
initial sets of landmarks in the source space
and the target space.  Then, only the landmarks
in the source space will be adjusted in order
to obtain a transform that optimizes the matching
between the fixed and moving images.

The choice of using the Source landmarks components
as parameters is a bit arbitrary. It could have been
the Target landmarks, or even both.  Those options
may be mathematically equivalent but they will
probably result in performance differences during
the exploration of the parameter space made by the
optimizer.


Please let us know if you encounter any problem
with these changes.


Thanks

	Luis


===============================================

zhangzhijun wrote:

> Dear Luis:
>          I want to put the TPS, EBS and VS transformation into the
> multi-modal registration frame work
> it is implemented following the 3 steps--- transform, similarity metric and
> optimization, now since the
> example of MIThinplatesplineRegistrator is not complete, I think I need do
> the following work:
>  1. Add an Initialization of the parameters for the TPS, in my case I want
> to register two
> 2D image of 181*217 dimensions, I choose totally 10*11 landmarks for
> calculating of the TPS parameters,
> After I calculate the W matrix, the itkKernelTransformation reorgnized the
> Wmatrix into three part but the
> 3 matrix members are all protected member, I find I can't have access to it.
> I want to set the 226 parameters
> and then use optimization method to do the optimization.
>  2  also I don't know how the deviation in the itk is implemented and what's
> the order for these 226 parameters.
> because I need do an steepest descent optimization, so the order of every
> parameter should follow some convention,
> I don't know what is it.
> 
> regards,
> zhang zhijun
> 
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