[Insight-users] Degenerated volumes question

[Miller, James V (Research)]

These filters do handle boundary conditions. The filters break an image up 
into a series of small regions, one that has no boundary conditions and N
that
have boundary conditions.

With such a small region, I am guessing some of the regions are empty and 
causing a problem. So I don't think this is a problem with a degenerate
volume 
(a volume with a single slice) but rather a region that has no pixels.

Can you provide more information about the specifics? For a particular
crash,
what was the region size? What filter were you trying to run? What size of a

structuring element were you trying to use?

Without this information, I cannot focus on where the bug will be.  Just
saying
you have a bug with small regions in ITK is not a very graceful way to
report a bug.



> -----Original Message-----
> From: Benjamin King [mailto:king . benjamin at mh-hannover . de]
> Sent: Tuesday, August 26, 2003 10:19 AM
> To: ITK
> Subject: [Insight-users] Degenerated volumes question
> 
> 
> Hi all,
> 
> I'm working on a program that takes a labled volume and then 
> finds the 
> minimal itk::Region that contains all voxels with a certain 
> label. I often 
> get very small regions i.e. with a size of (1,8,4). 
> Extracting them with 
> itk::RegionOfInterestImageFilter and afterwards applying 
> morphological 
> operations often (but not always) results in segmentation faults.
> 
> Padding the small regions will probably fix this but I was 
> wondering if it 
> would be possible to hide this in the MorphologyImageFilter 
> class. After 
> all these filters have to handle boundary conditions anyway, 
> haven't they?
> 
> I also think that a segmentation fault is not a very graceful 
> way to handle 
> degenerated volumes.
> 
> 
> Best regards,
>   Benjamin
> 
> -- 
> Benjamin King
> Institut fur Medizinische Informatik
> Medizinische Hochschule Hannover
> Tel.: +49  511  532-2663
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