[Insight-developers] LabelMaps and the Perimeter Estimation

[Gaëtan Lehmann]

Le 27 avr. 11 à 17:52, Bradley Lowekamp a écrit :

> Gaetan,
>
> Have you seen the following bug:
> http://www.itk.org/Bug/view.php?id=11934
>
> I encountered this bug myself. It is quite serious because the  
> roundness attribute can become quite erroneous, as I have seen it  
> >2.0 when theoretically it should always be less then 1.0. The  
> miscalculation is causing me to have some trust issues with using  
> this code and relaying on the computed attributes.
>
> In this current state I would not recommend moving the LabelMaps out  
> of ITK review.
>
> Your IJ paper says "More details about perimeter estimation will be  
> published in another article". I only bring up the issue because  
> LabelMaps are quite useful, and would like they to quickly be placed  
> in the reliable category.


Brad,

I've seen that problem, but didn't have any chance to fix it.
I'm not completely sure, but this may be more a problem with the  
perimeter estimation method than an implementation problem.

I agree that there is some work to do here, but conclude that the  
whole label map package is not reliable simply by looking at the lack  
of precision in perimeter (and thus roundness) estimation doesn't seem  
very fair. The perimeter estimation is a very small part of it, and  
other parts are producing a higher precision than what is found  
currently in ITK.

Of course some help would be welcome to track that problem, for  
example by creating tests with expected values.

Regards,

Gaëtan


-- 
Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://voxel.jouy.inra.fr  http://www.itk.org
http://www.mandriva.org  http://www.bepo.fr

-------------- next part --------------
A non-text attachment was scrubbed...
Name: PGP.sig
Type: application/pgp-signature
Size: 203 bytes
Desc: Ceci est une signature ?lectronique PGP
URL: <http://www.itk.org/mailman/private/insight-developers/attachments/20110428/0fcb1a5c/attachment.pgp>