[Insight-users] Find the inverse of a deformation field

[Guillaume Janssens]

Hi,

I would like to find the inverse of a 3D-displacement field that I've
computed with a deformable registration done with ITK. I saw that there
was a method in ITK, but that some bugs remained. So I was thinking about
another method but I wonder if this is really a good way to invert a field
:
The inversion could be done in 2 steps : - Deformation of the 3 components
(each component is stored as a 3D-image) of the 3D-field by the field
itself.
- Multiplication of the deformed components of the field by -1.0, so that
you get the displacement that go back to your original position. And you
should have the inverse field, if I'm right.

But it seems to be too simple to be correct, so I wonder what could be
wrong in this method ?

Every opinion would be greatly appreciated.

Guillaume.