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

[Sergio Vera]

Sorry
I meant SignedMaurer not SignedDaniesson (Maurer seems to be much faster
than Danielsson)

Maurer is 20-35 secs
Danielsson is over 120-130 seconds over  the same image (both compiled in
Release)

regards


On Tue, Jun 19, 2012 at 3:53 PM, Sergio Vera <sergio.vera at alma3d.com> wrote:

> 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
>



-- 
Sergio Vera

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