[Insight-users] different variations of demons registration

[Tom Vercauteren]

Hi Zoltan,

FastSymmetricForcesDemonsRegistrationFilter and
SymmetricForcesDemonsRegistrationFilter use the same algorithm from
Thirion. The only difference lies in the implementation. As
illustrated by the name of the class,
FastSymmetricForcesDemonsRegistrationFilter  should just be faster...

Tom

On Thu, Feb 18, 2010 at 00:59, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> 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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