I have asked this question on the QGIS mailing list, but have not yet had a satisfactory result.
The QGIS manual at http://www.qgis.org/en/docs/user_manual/processing/3rdParty.html is confusing about how OTB and QGIS work together and how to install them.
On the one hand, it indicates that the OTB files are installed as part of the standalone installation package. But then goes on to tell us what the file paths (in the Options and Configuration area) for the OSGEO4 installer.
My installation, on a Win 7 64 bit machine, was done via the standalone installer. I can see the various algorithms under Processing, but none of the OTB ones work. They all render an error that says that OTB is not configured correctly.
Because I haven't installed via the OSGEO4 installer, I can't use the file paths that are outlined on the above page.
All I can tell is that 'it should work' out of the box, but that's not my experience. Can anyone help?