[Insight-users] different variations of demons registration

[Luis Ibanez]

Hi Zoltan,


It seems that you missed the text from the header file:

      itkSymmetricForcesDemonsRegistrationFilter.h


<quote>
* This class was contributed by Corinne Mattmann, ETH Zurich, Switzerland.
 * based on a variation of the DemonsRegistrationFilter. The basic modification
 * is to use equation (5) from Thirion's paper along with the modification for
 * avoiding large deformations when gradients have small values.
 *
 * SymmetricForcesDemonsRegistrationFilter implements the demons
deformable algorithm that
 * register two images by computing the deformation field which will map a
 * moving image onto a fixed image.
</quote>


Is this the information that you are looking for ?


The difference in computation time is due to the fact that this
class computes gradients of both the Fixed image and the
Moving image.



      Regards,


             Luis



--------------------------------------------------------------------------------------
On Wed, Feb 17, 2010 at 2:15 PM, Zoltan Seress <seress.zoltan at gmail.com> wrote:
>
> Hi all,
> I have browsed the classes of itk 3.16 to get some information about the
> variants of the demons registration. I have found these:
> 1, itkDemonsRegistrationFilter: this is the one algorithm by Thirion: "Image
> matching as a Diffusion Process: and Analogy with Maxwell's Demons"
> 2, itkPointSetToSpatialObjectDemonsRegistration: this is another algorithm
> by Thirion
> 3, itkDiffeomorphicDemonsRegistrationFilter: it is presented by Vercauteren
> (http://hdl.handle.net/1926/510) Algorithm 3 should be this one.
> 4, itkFastSymmetricForcesDemonsRegistrationFilter: it is also presented by
> Vercauteren (http://hdl.handle.net/1926/510) Algorithm 2 should be this one.
> 5, itkSymmetricForcesDemonsRegistrationFilter: There is no additional info
> in the description. Has not been this implementation published somewhere?
> All I know that it uses both the moving image gradient and the fixed image
> gradient, and it is approximately 3 times slower
> than itkDemonsRegistrationFilter. Can you tell me more about this filter?
> PS: I know about other variants such as log-domain diffeomorphic demons and
> symmetric log-domain diffeomorphic demons, but these are too much for once.
> --
> Zoli
>
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