[Insight-users] Watershed Behavior

[Richard Beare]

Have a look at the gradient image and dheck whether there are plateaus
in the zig-zag area. The behaviour of the standard itk watershed is
somewhat arbitary in the presence of plateaus.


On 2/8/07, Albert Huang <alberth+itk at ece.ubc.ca> wrote:
>
>
> Dear experts
>
> I was just playing with the watershed pipeline a few days ago using a
> checkerboard pattern (with uint8 grids of black=64, gray=153, white=192),
> and observed a zig-zaggy pattern on some edges (see
> http://www.ece.ubc.ca/~alberth/watershed.png). Adding a
> smooth field on the checkboard results in more zig-zaggy behaviors on edges
> that seem fairly strong in the input image. I am wondering if this is normal
> behavior for the itkWatershedImageFilter?
>
> My pipeline (ITK 3.0.1) setup is as below:
>     file reader ->
>     vector gradient magnitude image filter (pca off) ->
>     watershed (level=0.2, threshold=0.0) ->
>     relabel component
>
> p.s. The black regions in the outputs are colormap problems and not a
> watershed issue. =)
>
> Thanks
> Albert
>
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