[Insight-users] setting initial transform parameters

[Luis Ibanez]

Hi Erik,

The BSplineTransform can be initilized directly with an
AffineTransform by simply connecting the AffineTransform
as its "Bulk" transform.

Please look at the examples:

Insight/Examples/Registration/
          DeformableRegistration14.cxx
          DeformableRegistration15.cxx
          DeformableRegistration8.cxx


Look for the lines:

 transform->SetBulkTransform( affine_transform );

---

The general problem that you are facing, on the other hand,
does not have an easy solution. All Transforms have a
different number of parameters. This is simply because the
Transform hierarchy is progressively increasing the degrees
of freedom of the transforms.

You will have to initialize TransformA from TransfromB
on a case by case basis.


Regards,


       Luis



----------------------------------------------------------
On Tue, Sep 8, 2009 at 8:11 AM, Erik Tuerke <tuerke at cbs.mpg.de> wrote:

>
>
> Hello!
>
> I am writing a registration programm based on itk.
>
> I want the program to have the following facility: the user is able to set
> a series of transforms. Considering an affine transform following a
> non-linear transform(e.g. bspline transform). What i want to do is to pass
> only the transform gained by the affine transform to the bspline
> registration step (not the resampled image from the affine registration
> step).
> My problem is, that the regsitration method of the bspline registration
> step expects a lot more parameters than i get by the affine registration
> step. Is there a way to convert the affine transform into a, say, bspline
> transform and pass this transform to the SetInitialTransformParameters
> method of the registration method which is responsible for the bspline
> transform?
>
>
> Thanks a lot and best regards!
>
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