[Insight-users] inverting deformation fields

[Matt McCormick]

Hi Anja,

If displacement vector field gives the displacement at location x, but
the negative of the displacement at location x is not the inverse;
what is required is negative of the displacement vector at x + \delta
x.

HTH,
Matt

On Wed, Apr 10, 2013 at 5:47 PM, Anja Ende <anja.ende at googlemail.com> wrote:
> Hello all,
>
> This is a very naive question and I would be very grateful if someone can
> clarify this doubt for me.
>
> I see that there are quite a few filters and some very sophisticated methods
> for inverting deformation fields.
>
> If I have a dense deformation field, why is it not enough to simply negate
> the displacement vector to compute the inverse? I am sure there is a simple,
> logical explanation for this but I am having trouble figuring it out.
>
> Thanks a lot for your help!
>
> Anja
>
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