[Insight-users] Re: [vtkusers] A theoretical question

[Arne Hansen]

Dear Daniel
Thank you for your answer. This looks very interresting I think.
Could this filter also be used for a coupled shape model i wonder?

A coupled shape model is where i have several regions represented in my same
shape model. This means that i simulataneously can segment many regions, and
use the prior knowledge of the spatial position of the different regions,
which i have also captured in my shape model.
For more information of the strongly coupled model, this article gives a
good insight:
 http://ssg.mit.edu/group/alumni/atsai/Papers/IPMI03.pdf

I hope to hear from you or anybody else soon.
Yours Sincerely
Arne Hansen


2007/1/26, Daniel Mace <dlm19 at duke.edu>:
>
> Arne,
>
> Is your question: what methods are out there that you can use (but would
> need to implement), or what methods are in ITK/VTK that you could use?
> The standard shape model in ITK is the the work done by Leventon et al.
> (
> http://spl.bwh.harvard.edu:8000/pages/papers/leventon/cvpr00/cvpr00.pdf
> ).  His method basically relies on the observation that the gradient of
> an image is inversely related to a signed distance map and created a MAP
> estimate from it.  If you already have your mean + modes of variation
> then using his method should be easy to implement (easy to implement,
> getting the parameters to converge might take a bit).  It's described in
> 9.3.7 in the ITK software guide.
>
> Cheers,
> Dan
>
> Arne Hansen wrote:
> > Hello. I have a question regarding the use of shape models built using
> > Signed Distance Maps(Level Set Function).
> > I have applied a principal component analysis on my Level Set
> > Functions, and found a meanshape + modes of variation.
> > I now need to use these as prior information in a segmentation model
> > where certain regions(those which my shape model represent) needs to
> > be segmeneted.
> > I am however unsure of how i can do this. So my question is if an
> > Active Appearance Model technique can be used when i have built my
> > shape model on Level Set Functions, or if i actually need to do it on
> > landmarks.
> >
> > Is there other methods to use?
> > Maybe you can recommend a method to use.
> > Thank you very much, and best of regards.
> > Arne Hansen
> > ------------------------------------------------------------------------
> >
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>
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