[vtkusers] Statistical Model with partially available observations (using vtkPCAStatistics and vtkPCAAnalysisFilter)

[Cory Quammen]

Stefan,

This is not a direct answer to your question, but you may find ITK
(http://www.itk.org) a more suitable library for working with AAMs and
ASMs. You can find documentation for the library here:
http://www.itk.org/Doxygen316/html/classes.html.

Cory

On Thu, Mar 18, 2010 at 12:31 PM, Dänzer, Stefan
<Stefan.Daenzer at medizin.uni-leipzig.de> wrote:
> Dear List,
>
>
>
> I’m a research assistant at the Innovation Center Computer Assisted Surgery
> (ICCAS) in Leipzig, Germany. I’m working on Active Shape Models and Active
> Appearance Models at the moment. I’ve discovered two classes of interest for
> me in vtk. These are:
>
> vtkPCAAnalysisFilter (Intended for spatially corresponding points on shape
> models) and
>
> vtkPCAStatistics (A more general filter to assess observations and project
> those observations in the eigenspace of their covariance matrix. This is
> what I use for creating statistical models of texture, e.g. Active
> Appearance Models)
>
>
>
> I was wondering how these two filters cope with incomplete observations,
> e.g. missing data components in the observations.
>
>
>
> Let me illustrate this by an example. If we want to build a statistical
> model of an object in an image, say an apple in a photograph. Assume we have
> several photos of apples and their respective segmentations as training data
> for our model. Further assume some apples are only contained partially in
> some of the photos. Statistically speaking, those apples represent partial
> observations. I was wondering how to best incorporate those partial
> observations in a statistical model which could be built by the two
> mentioned vtk filters.
>
>
>
> Regards,
>
>
>
> stefan
>
>
>
> _______________________________________________________________________
> Dipl. Inform. Stefan Daenzer
> Research Associate | Working Group - Scientific Methods
>
> Universität Leipzig | Faculty of Medicine
> Innovation Center Computer Assisted Surgery (ICCAS)
> Semmelweisstr. 14
> D - 04103 Leipzig
> Germany
>
> Phone: ++49 (0) 341 / 97 - 1 20 03
> Fax: ++49 (0) 341 / 97 - 1 20 09
> Email: stefan.daenzer at iccas.de
>
>
>
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-- 
Cory Quammen
Center for Computer Integrated Systems for Microscopy and Manipulation (CISMM)
Department of Computer Science
University of North Carolina at Chapel Hill
http://www.cs.unc.edu/~cquammen