[Insight-users] Behavior of FastMarchingImageFilter

[Dan Mueller]

Hi Amar,

Perhaps you can post a minimal example (code, input image, output
image) demonstrating the issue.

I have not experienced this issue myself, but the
FastMarchingImageFilter does propagate the front using
4-/6-connectivity, so after a small timestep it may be possible to
experience the "jagged" edge you are seeing (though not the checked
pattern inside the hole). How many iterations are you letting the
filter run for? (ie. what is the stopping value?)

Also, the FastMarchingImageFilter requires a real (float, double)
output image. What is the pixel type of your output image?

Cheers, Dan

2009/5/7 Amardeep Singh <amar.singh at gmx.de>:
> Hello everyone
>
> I am wondering about the behavior of the FastMarchingImageFilter.
> I want to let the algorithm march from a certain surface which is
> represented by a binary image. I
> pass the points of the object as alive points to the marcher. The layer
> outside of the object (in my case: a brain)
> is passed as trial points. When I look at the output of the fast
> marching filter, there is something strange -> see attached screenshot.
>
> The area within the yellow line is my initial object. So they are all
> alive points whose value is 0 in the output.  But when you look at the layer
> outside of the inner object, you see that it is jagged, black (value 0)
> and white (value != 0) voxels take turns. Why is this the case?
> What do I need to do, so that the marcher marches equally away from the
> alive points. The speed image values on the layer around the alive
> points do have the same value, so this is not the reason.
>
> Thanks a lot in advance!
>
> Best Regards
> Amar
>
>
>
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