[Insight-users] Re: Drawing a circle into image

[Luis Ibanez]

Hi Sami,

You can use the FastMarching filter for creating a circle.

You can also use the EllipsoidSpatialObject and the
itkSpatialObjectToImageFilter

http://www.itk.org/Insight/Doxygen/html/classitk_1_1SpatialObjectToImageFilter.html


You can also use the Danielsson distance map, already in ITK,
or the new Maurer distance map posted to the Insight Journal
in February 17th.
http://www.insightsoftwareconsortium.org/InsightJournal/view_reviews.php?back=publications.php%3Fjournalid%3D4%26order%3D%26revision_display%3D&pubid=77
By thresholding the output of the distance maps from one point,
you will get a circle of the desired radius.


BTW, note that there is already a couple of deformable model
implementations in ITK.

In particular you may want to look at the application in 
InsightApplications:

      InsightApplications/
              DeformableModelSimplexMesh

which uses the

        itkDeformableSimplexMesh3DFilter



Regards,


     Luis



------------------------------------------------------------------------------------
sami bourouis wrote:
> Dear Luis,
> 
> I would like to create a circle, given a specified center and radius.
> I would like to intialize this circle like a "deformable contour" and 
> deforme it under the action of enrgy function. the objective ok my work, 
> firsly,  is to re-implement the classic snakes (active contour) (Kass et 
> al 1988).
> 
> Can I use for example FastMarching filter to initialize and draw a 
> circle on my image and move it under an energy function ?
> 
> Any suggestions? essentially for initialization of a circle,
> thanks !
> 
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