[Insight-users] 2D Skeleton and articulation points with ITK

[Kishore Mosaliganti]

1. Did you try downsampling your image and running the same filter.
Since you are looking for the articulation points, it should not
change your result too much.

2. How about smoothing with a box filter (average) with kernel radius
= 1. In other words, the kernel is 3x3 in size. At articulation
points, you will have a value larger than 2/9 in the output.

Kishore




On Tue, Nov 16, 2010 at 2:54 PM, Agustin Conde Martin
<a.conde409 at uniandes.edu.co> wrote:
> Hi everyone
>
> I'm using the itkBinaryThinningImageFilter for calculating a 2D skeleton
> from a 2D input image. In the attachment you can see the input image and its
> calculated skeleton with the mentioned filter. I have 2 questions:
>
> 1. The calculation of that skeleton took 3 minutes and 30 seconds. That is a
> lot of time but the skeleton is perfect! It is what I really want! But I
> want it to take less time. Is there another way to calculate this skeleton
> in less time?!
>
> 2. From the attached skeleton image, what is the best way to calculate its
> articulation points (joints)? This calculation can be based on a criteria,
> for example, "a joint is considered a point between a great change of
> direction in the skeleton". Where can I start to learn the techniques for
> doing this?
>
> Sincerely,
>
> Agustin Conde
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