[ITK Community] Smoothness term in ITK
David R. Haynor
haynor at u.washington.edu
Sun Jan 19 22:43:54 EST 2014
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.
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> Andras
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> 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,
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>
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> A smoothing term, will probably only make sense for the Deformable transforms:
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>
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> * Kernel Transform
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> * Displacement Field
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> * BSpline Deformations
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> Note that, this would be rather a measure that is computed after the fact,
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> rather than something that is computed during the registration process.
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> Although in the case of the Demons registration, there is indeed the equivalent
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> of a smoothness constraint.
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> Regards,
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> Luis
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> On Sun, Jan 19, 2014 at 3:27 PM, Hana Cherif <hanacherif62 at gmail.com> wrote:
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> Hi Mr. Louis
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> I refer to transform classes in itk ,, thanks
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>
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> 2014/1/19 Luis Ibanez <luis.ibanez at kitware.com>
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> Hi Hana,
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> Are you referring to the itk::Transform classes ?
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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:
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> Hello,, all!!
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> A question please :: In addition to the similarity term,, is there a componnent in itk used to compute the smothness term of that transformation ??
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> Thanks for help in advance!!
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