[ITK Community] Smoothness term in ITK

[David R. Haynor]

hi all,

a smoothing term is easily incorporated into registration, along with its gradients.  i don't understand luis's comment.

-dh

On Mon, 20 Jan 2014, Andras Lasso wrote:

> 
> It would be great to have a term in the registration metric to penalize non-smoothness of the BSpline (displacement of the control points). Currently, the
> BSpline registration in ITK cannot be used on many radiation therapy CT scans, because the BSpline control points wander randomly in the soft-tissue regions
> that look quite homogeneous in CT. For example, the BSpline registration implementation in Plastimatch can penalize the control point displacement and the
> result is a nice smooth displacement field.
> 
>  
> 
> Andras
> 
>  
> 
> From: Community [mailto:community-bounces at itk.org] On Behalf Of Luis Ibanez
> Sent: January 19, 2014 3:44 PM
> To: Hana Cherif
> Cc: community at itk.org
> Subject: Re: [ITK Community] Smoothness term in ITK
> 
>  
> 
> Hana,
> 
>  
> 
> A smoothing term, will probably only make sense for the Deformable transforms:
> 
>  
> 
> * Kernel Transform
> 
> * Displacement Field
> 
> * BSpline Deformations
> 
>  
> 
> Note that, this would be rather a measure that is computed after the fact,
> 
> rather than something that is computed during the registration process.
> 
>  
> 
> Although in the case of the Demons registration, there is indeed the equivalent
> 
> of a smoothness constraint.
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>  
> 
>    Regards,
> 
>  
> 
>  
> 
>        Luis
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> On Sun, Jan 19, 2014 at 3:27 PM, Hana Cherif <hanacherif62 at gmail.com> wrote:
> 
> Hi Mr.  Louis
> 
> I  refer to transform classes in itk ,, thanks
> 
>  
> 
> 2014/1/19 Luis Ibanez <luis.ibanez at kitware.com>
> 
> Hi Hana,
> 
>  
> 
> Are you referring to the itk::Transform classes ?
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>  
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> or to Level Set filters ?
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>  
> 
> Could you please elaborate a bit more ?
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>  
> 
>     Thanks
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>          Luis
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> On Sun, Jan 19, 2014 at 3:21 PM, Hana Cherif <hanacherif62 at gmail.com> wrote:
> 
>       Hello,, all!!
> 
> A question please ::  In addition to the similarity term,,  is there a componnent  in itk used to compute the smothness term of that transformation  ??
> 
> Thanks for help in advance!!
> 
>  
> 
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