[ITK-users] Exponential Displacement Field Image Filter

[brian avants]

there are probably numerical limitations to that filter.

however, a more fundamental concern is that the velocity fields must be
regular in some sense for the exponential to be valid.

you could try smoothing after you average.
On Apr 30, 2014 7:05 AM, "Pedro Morais" <pedromorais-17 at hotmail.com> wrote:

> Hi,
>
> I'm combining two affine transformations computing a velocity field sum.
> Then, I'm using the ExponentialDisplacementFieldImageFilter to compute a
> diffeomorphic displacement field. Since this method is diffeomorphic, the
> inverse transformation should be always available. So I'm computing the
> displacement field and it's inverse (I use the
> ExponentialDisplacementFieldImageFilter with ComputeInverse). The problem
> is, when I use this strategy with two rotations (two concentric circles) in
> opposite directions, applying  the inverse displacement field is not giving
> the initial position(so, the diffeomorphic transformation is not verified).
> Do you have any information about some problem in this class?
>
> Thanks for the help.
>
> Regards,
> Pedro Morais
>
>
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