links for 2007-03-25 (ruminating on visual code tags)
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Semacode’s Software Development Kit is a system for ubiquitous computing. Using the Semacode SDK you can create visual tags for objects and contexts, and read them using a mobile camera phone.
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Kaywa’s QR (Quick Response) codes are visual tags for objects that can be read on a mobile camera phone.
2007.04.01 update: related NYTimes article by Louise story: “New Bar Codes Can Talk With Your Cellphone”