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Andrew writes –

A while back, Roo Reynolds posted about his experiments with Reactivision. Reactivision is a really neat way of building what’re called tangible user interfaces; it’s a bit of software which reads in video being captured by a webcam and tracks the position (and rotation) of special blobs called “fiducial markers”. In other words, it can work out where, in the camera’s field of vision, these objects are, and what way they’re facing.

I’ve mentioned this thing in passing before, actually, but I didn’t think anything more of it at the time. Roo’s post mentioned that the core vision library was open source, though, and there’s a Processing library, so one night on my way home from work, I decided to buy a cheap £20 webcam from Tesco.

DIY Tangible user interface for performing a chemical search by just putting real objects down on a real surface, thanks Attila! Link.