[Qgis-user] Segmentation : how to add texture criterion ? (not only colour/spectral variable)

[celati Laurent]

Hello.
My goal is to generate a relevant segmentation that would delimit the main
physiopnomic units (homogenous areas). Up to now, I have done several tests
with qgis and orfeotoolbox 9 with the OTB Generic Region merging
module : GenericRegionMerging
— Orfeo ToolBox 7.0.0 documentation
<https://www.orfeo-toolbox.org/CookBook-7.0/Applications/app_GenericRegionMerging.html>
with those folowing settings

   - input image : spot 6/7 satelite image (band blue, green, red, near
   infrared)
   or Aerial french mapping agency images (50 cms bd ortho with green, red
   and near infrared).
   *Homogenity criterion to use : Baatz & Schape
   - Threshold for the criterion : 500
   - Number of iterations`: 0
   - Weight for the spectral homogeneity : 0.1
   - Weight for the spatial homogeneity : 0.1

The result is rather interesting for certain areas, in particular crops
areas, without too much vegetation. on the other hand, the method does not
seems optimal, in particular for forest areas.
I’m taking the liberty to paste some screenshots :
the first SS showing interesting result on crop areas :

[image: 4d3f841e567bd5ac5ce37035342c4e71e78d16c6.jpeg]
A second SS showing the non relevant result on forest areas :
[image: 9b64943de826eddd230762b3d2a5eb358cc423ec.jpeg]
Perhaps for these forest areas, the color/spectral criterion is not
relevant. It would be better to generate / integrate texture information?
As far as i understood, this GRM OTB module is based only on
spectral/colour criterion but not take into consideration texture
information.
Are there other orfeotoolbox segmentation module that takes into account
not only the color criterion (spectral) but also texture information?
If this is not the case, should i create some kind of new raster (add a
band to my existing color infrared raster) dedicated to texture and/or ndvi
information?
Thanks so much for your guidances.
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