I finally finished a first version of a Supervised Classification GUI using ImageJ and R within Bio7:
At the moment it can be installed into Bio7 3.1 following the Github documentation (see video below).
I reused the ROI Manager for the creation of classes using the underscore notation.
The plugin can be compiled dynamically. I tried to simplify the Java source so that it can be
extended easily. Feedback and suggestions are welcome.
The executed simple R scripts (using a Random Forest example) can be adapted easily for training and classification using the R package universe.
A big thank you to @schmid to solve and fix a thread blocking RankFilters mystery.