Is there a function that produces an ISODATA unsupervised classification in QGIS?
The only unsupervised classification function I can find is a KMeans.
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An old post, but just as an update;
In QGIS >= 2.18.14, there is a ISODATA Clustering for Grids tool, under
SAGA | Image analysis.
Some additional detail about the module is found here: Module ISODATA Clustering for Grids.