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

[Laurent CELATI]

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 :
[cid:image001.png at 01DB8D19.9DA95260]
A second SS showing the non relevant result on forest areas :
[cid:image002.png at 01DB8D19.9DA95260]
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 qgis/grass/ orfeotoolbox or whatever other 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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