Real Time Object Recognition on a Mobile Device

http://www.youtube.com/watch?v=lUUxGvDqok4

Real-Time Object Recognition on a Mobile Device. I’ve seen this done for product lookups like books and boxes of cereal at the store, but hadn’t considered the accessibility implications. Not a bad idea, assuming that it produces valid information most of the time. Also seems like it would be limited to objects of a specific scale?