[Insight-users] SignedDanielssonDistanceMapImageFilter Very Slow on 3D Volume?

[Sergio Vera]

Hello
Mi experience is that SignedDanielsson runs in about 20-35 seconds in
average size volumes (ex: 256x512x400).
Debug code can be as slow as 8-10 times easily but 30 minutes is a bit
excessive for your image imho .
Give it a try in Release mode and see what your timing is.




On Tue, Jun 19, 2012 at 3:32 PM, Chad Stanford <chadz111 at hotmail.com> wrote:

>  Hello,
>
> I'm new to ITK, but have managed to implement a custom level set
> segmentation filter by deriving from the SegmentationLevelSet classes.  In
> my case I am provided a rough initial mask that I feed into the
> SignedDanielssonDistanceMapImageFilter to get the initial level set input.
>  This step works almost instantaneously when I test my code on 2D slices
> from a volume in analyze format (.hdr/.img).  However, when I try running
> my code on the whole 3D volume (only 256^3 voxels)
> the SignedDanielssonDistanceMapImageFilter takes at least 30 minutes,
> possibly much more because I get impatient and stop it before it finishes.
>
> Does anyone know if it is normal for the filter to perform this way on
> volumes and if not why this might be happening and/or how I can fix it or
> get around it?
>
> The volume seems to be read in fine because I can read it in, output it
> again and visualize the output fine.  Tracing through the code shows that
> it seems to be getting stuck in the while loop beginning on line 408 in the
> GenerateData function in itkDanielssonDistanceMapImageFilter.hxx .  I am
> running the code in debug mode, but over 30 minutes seems excessive
> nonetheless.
>
>
> Any ideas?!?
>
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-- 
Sergio Vera

 Alma IT Systems
 C/ Vilana, 4B, 4º 1ª
 08022 Barcelona
 T. (+34) 932 380 592
 www.alma3d.com
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