Hi everyone,
Some time ago I played around with computer vision to get images categorized on Commons. I documented this at https://commons.wikimedia.org/wiki/User:Multichill/Using_OpenCV_to_categoriz... . I don't think I'm going to spend time on it soon, but the results were quite promising, so maybe someone else feels like working on this? Would probably be a pretty nice student project or just fun to do.
Maarten