[GRASS-user] Image segmentation

[Pedro Venâncio]

Hi Giuseppe,

Maybe you can use r.watershed [0] to get the "basins".

Best regards,
Pedro Venâncio

[0] https://grass.osgeo.org/grass72/manuals/r.watershed.html

2017-01-18 19:16 GMT+00:00 Giuseppe Amatulli <giuseppe.amatulli at gmail.com>:

> Hi all,
>
>
>
> I would like to "segment" an image using a sort of Voronoi
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_Voronoi-5Fdiagram&d=CwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=WXcS58IfKIlNshJRe1p51UO4aV2lTPDP2KeAvExEWkM&m=-q05ggwZ7xB31XO6ZJhmFYht4GKQ2nmFojS6li_t2As&s=Cqh6IsnZ5-oxcE2yVMRceyhb4KwTB2q3ihdDv8E4GWg&e=> algorithm
> on a cost surface instead of distance between point.
>
>
>
> Below you can see an image where the black pixels identity areas with high
> cost value. I would like to identify the "valley" between theses black
> areas.
>
>
>
> In the second image I draft by hand an ideal solution for few high cost
> areas.
>
>
>
> Which grass command can do this kind of delineation?
>
>
>
> Thanks,
>
>
> Giuseppe
>
>
> [image: Inline images 1]
>
> [image: Inline images 2]
>
> --
> Giuseppe Amatulli, Ph.D.
>
> Research scientist at
> Yale School of Forestry & Environmental Studies
> Yale Center for Research Computing
> Center for Science and Social Science Information
> New Haven, 06511
> Teaching: http://spatial-ecology.org
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__spatial-2Decology.org&d=CwMFaQ&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=WXcS58IfKIlNshJRe1p51UO4aV2lTPDP2KeAvExEWkM&m=-q05ggwZ7xB31XO6ZJhmFYht4GKQ2nmFojS6li_t2As&s=2WUybjpe6r7Te9PU70VIWSGVIuSPRvgtrQM-Ej6RBuY&e=>
> Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
>
>
>
>
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