[Insight-users] Re: ask for help on DeformableMesh3DFilter

[Samuel Rodríguez Bescos]

Hi, Deliang,

I agree with Luis. In adition, I noticed that the surface didn't have
important changes in its evolution when I used   the DeformableMesh3DFilter
in an example similiar to yours (to refine a surface model got from a region
growing  method) . I didn't try any level sets method but I think that they
could be better option.

With reference to the question about de values of the parameters of the
filter I think that there aren't a fixed rules, unfortunately we have to
test and check.

Regards,

Sam

============================================
Samuel Rodríguez Bescós
Bioengineering and Telemedicine Department
ETSI Telecomunicacion

Universidad Politécnica de Madrid
Ciudad Universitaria s/n - 28040 Madrid - Spain

Ph: +34 91 550 04 35 (ext.32) // +34 91 549 57 00 (ext. 332)
Fax: +34 91 336 68 38

Email: srodrigu at gbt.tfo.upm.es
Web: http://www.gbt.tfo.upm.es
============================================


----- Original Message ----- 
From: "Luis Ibanez" <luis.ibanez at kitware.com>
To: "Deliang Ye" <dye at jhu.edu>
Cc: <srodrigu at gbt.tfo.upm.es>; <Insight-users at itk.org>
Sent: Wednesday, April 07, 2004 8:40 PM
Subject: Re: ask for help on DeformableMesh3DFilter


>
> Hi Deliang,
>
> The DeformableModel filter is quite unstable
> and may not be the best options for refining
> an existing segmentation.
>
> You may want to look at the LevelSet methods
> since they provide better mechanisms for
> enforcing estability.
>
> Please take a look at the LevelSet chapter
> in the software guide.
>
>   http://www.itk.org/ItkSoftwareGuide.pdf
>
> Section 9.3, pdf-page 363.
> In particular you may want to look at
>
>   - GeodesicActiveContours
>   - ThresholdLevelSet
>   - CannyEdgesLevelSet
>
> Associated examples are available under
>
>    Insight/Examples/Segmentation
>
>
>
>
> Regards,
>
>
>    Luis
>
>
> ----------------
> Deliang Ye wrote:
>
> > Hi, Luis and Sam,
> >
> > I got a rough segmentation of rat spinal cord by region growing, I would
> > like to use deformable mesh filter to refine the result. But the program
> > failed, and told me memory access violation. I have not changed any
> > parameters in DeformableModel1.cxx  in ITK, what is the rule of thumb to
set
> > the parameters, such as stiffness, scale, gradient magnitude, time step,
and
> > step threshold in DeformableMesh3DFilter?
> >
> > Please check that attached file,
> >
> > Appreciate you for help!
> >
> > --Deliang Ye
> >
> >
> > ------------------------------------------------------------------------
> >
>
>
>