[Insight-users] Help with GeodesicActiveContourImageFilter --> Modification to example code does not seem to work

[Juan Cardelino]

Hey Ella,
       I think you are confusing things a little and confusing two different
examples. The GAC filter needs 1 distance map and 1 feature image.
In the example, the distance map is the output of the Fast Marching (FM)
filter and it is computed from a set of seed points. On the other hand the
feature image is computed by the sigmoid filter.
As I understood your question, you want to use your custom level set instead
of the one constructed from seeds.
So in your case you should create a binary mask, pass it to the Danielsson
filter (DF) and the use the output of the DF to the GAC filter. I think your
mistake is to use the DF as input for the FM filter.
So for this task you don't need the FM filter at all.
I hope it is clearer now.
Best regards,
                       Juan

On Mon, Feb 14, 2011 at 9:11 PM, Ella Maria Kadas <ella_kadas at yahoo.com>wrote:

> Hi
> I am sorry to bother u again, but i am really stuck with Level set Filter.
> I implemented the geodesic active contour, and also chan-vese method using
> level set method in java few moth ago, but i can't figure out the why using
> the same steps as in the Itk user guide, i dont get any results.
>     So i want to ask u again. In the user guide for the first example for
> FastMarchingFilter, the input of the fastMarching is he output of the
> sigmoid filter. Should this be a binary image?.
>    And in the geodesicactivecontourFilter. In the chart where the pipeline
> is shown the Fast Marching Filter gets the seeds and the Distance map (which
> would make sense to me because i use to do it the same way using the narrow
> band method). So i used the SignedDanielssonDistanceMapFilter to generate
> the map, from the binary image where all is black only the seed point is
> white, and then i put this map and the seed point in the FastMarchingFilter.
> Then the GeosedicActiveContourFilter gets the fastMarching output and the
> sigmoidFilter's output, but i still et very strange results.
>    If u have any suggestions pls:),
> Thanks,
> Ella
>
> --- Juan Cardelino *<juan.cardelino at gmail.com>* schrieb am *Fr, 11.2.2011:
> *
>
> *
> Von: Juan Cardelino <juan.cardelino at gmail.com>
>
> Betreff: Re: [Insight-users] Help with GeodesicActiveContourImageFilter -->
> Modification to example code does not seem to work
> An:
> CC: insight-users at itk.org
> Datum: Freitag, 11. Februar, 2011 00:10 Uhr
>
> *
> *I'm using it intensively without any problem. Could you give us more
> details about what  you are exactly doing?  An example image would also
> help.*
> *Are you trying to do the same as Vimal? i.e. using your own generated
> level set as initial condition?
> *
> *Regards,*
> *           Juan
> *
> *
> *
> *On Thu, Feb 10, 2011 at 7:55 PM, Ella Maria Kadas <ella_kadas at yahoo.com<http://mc/compose?to=ella_kadas@yahoo.com>
> > wrote:
> *
>
>
>
> Hi Vimal,
>
> Did u manage to use the GeodesicAcctiveContourImageFilter in the end?
> I am facing a similar problem. I can see the output of all the filters,
> except the output of the FastMarchingFilter which is just a black image.
> I would really appreciate any suggestions about why this happens. I tried
> to look at older posts aswell, but there was no further information or
> solution to this problem.
> Thanks a lot,
> Ella
> *
>
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