Missing Dependency in SAGA. Orfeo Toolbox does not work

Question

I am trying to perform segmentation from Orfeo Toolbox (QGIS last version 2.2), whenever I try to use the toolbox, I get the following message:

Oooops! The following output layers could not be open
Output labeled image: D:/ERDAS_examples/Sardegna
1954/segmnentation.tif
The above files could not be opened, which probably indicates that
they were not correctly produced by the executed algorithm
Checking the log information might help you see why those layers were
not created as expected

The same when I try to use SAGA toolbox:

Missing dependency.This algorithm cannot be run :-(
This algorithm requires SAGA to be run.Unfortunately, it seems that
SAGA is not installed in your system, or it is not correctly
configured to be used from QGI,
Click here to know more about how to install and configure SAGA to be
used with QGIS

How do I solve this?

AndreJ · Answer

Under Processing -> Options and Configuration, Data Providers,

take a look at the SAGA entry. Sometimes, the entries for the folder of the application is empty.

For Orfeo Toolbox, the message is different, so QGIS has found the application, but the output file is not generated. You have to take a closer look at the log OTB produces.

radouxju · Answer

It seems you are encountering Error in OTB segmentation with certain projections and the proposed workaround is to work in WGS84.
For using OTB, a workaround is to install the stand alone Monteverdi software (directly based on OTB), also available from OSGEO4W. Using the task specific OTB applications could also be more "robust".  (see the cookbook for more details)

Missing Dependency in SAGA. Orfeo Toolbox does not work

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