[ITK] Canny edge detection filter results

[Dženan Zukić]

Hi Joao,

if you are doing Canny filtering in 3D and then looking at 2D slices, the
edges are usually not 1 pixel thick. This is because edge for 3D is a
surface, and when you slice that surface along anatomical axes the surface
will not be orthogonal to the slices in most places. Where surface is
orthogonal, you get nice 1 pixel wide intersections. Where surface is
parallel to the slice, you get a sizable intersection surface.

Regards,
Dženan

On Mon, Jan 18, 2016 at 11:47 AM, Joao Ascenso <j.ascenso at campus.fct.unl.pt>
wrote:

> Hello,
> I'm working on OCT images (DICOM volume) of the retina and trying to do
> the segmentation of some layers.
>
> After doing some noise reduction I'm applying the
> CannyEdgeDetectionImageFilter, but the result give me thicker edges than
> should be expected from Canny.
>
> Changing thresholds influences the amount of edges detected but don't
> improve this issue.
>
> Anyone have came across similar problem? Any suggestion is welcome.
>
> Thank you,
>
> João Ascenso
>
>
> _______________________________________________
> Community mailing list
> Community at itk.org
> http://public.kitware.com/mailman/listinfo/community
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/community/attachments/20160118/eb11bb2e/attachment-0001.html>