OTB 9 (windows) : how to use Generic region merging segmentation? (external module)

image80 · February 21, 2025, 10:26am

Good morning,
I work on a windows 11 station. I succeed in installing OTB-9.1.0-Win64 and connecting it with my 3.34.13-Prizren qgis version. I would like use “GRM” : Generic region merging segmentation", the baatz and Schape Segmentation. But when i open the segmentation panel, the segmentation algorithms availables are :meanshift, cc, watershed, mprofiles. Is there some guidances in order to use GRM with OTB 9 and qgis ?
Thanks so much for your help.

thibaut.romain · February 21, 2025, 1:02pm

Hi,

The GenericRegionMerging application should be available through QGIS, as there is a .bat and the app is in the lib directory of OTB.
If it is not the case, there is a problem with the package, we will have a look at it.
The documentation of external modules is generated if the module provides it, but here you can see the parameters list by reading the code :

github.com/orfeotoolbox/GRM

app/GenericRegionMerging.cxx

master

/*=======================================================================
 Program:   ORFEO Toolbox
 Language:  C++
 Date:      $Date$
 Version:   $Revision$
 
 Author: Lassalle Pierre
 Contact: lassallepierre34@gmail.com
 Website: http://pierre33.github.io/
 
 Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
 See OTBCopyright.txt for details.

 This software is distributed WITHOUT ANY WARRANTY; without even
 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 PURPOSE.  See the above copyright notices for more information.
 
 =======================================================================*/
#include "otbImage.h"
#include "otbVectorImage.h"

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tristanlaurent · February 24, 2025, 9:52am

Hi @image80 ,
This is a known problem on QGIS with windows, we will correct it.
You can find the fix here Can't find ColorMapping (#9) · Issues · Main Repositories / otb-QGis-plugin · GitLab until we release a new windows version.
I also advice you to use a QGIS > 3.34 to get the latest OTB plugin where some bugs are fixed (you can find installation instructions here: QGIS interface — Orfeo ToolBox 9.1.0 documentation )
Best regards

thibaut.romain · March 25, 2025, 3:09pm

hi @image80

The version 9.1.1 just got released today, it fixes the problem in QGIS. You can use GenericRegionMerging now

Best regards