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Tag-readerRunningOnACameraPhonehttp://www.deviceforge.com/articles/AT5785815397.html I found this very interesting and useful: Maybe when you're walking down a city street and see a poster for a movie or a play. On the poster is a visual tag. By using a camera phone, you could click on the visual tag to get more information on the film -- perhaps a listing of the show times and locations where it is playing. Additionally, there may be an option to buy your tickets right then and there. Visual tags encode information in two parts: a service identifier and a data block. The service identifier encodes the name of the Bluetooth service to which a tag relates. The data block contains a few bits of application-specific information that are used to identify a particular tag. By using a combination of visual tags and Bluetooth, the user is shielded from tedious and unintuitive device naming and pairing issues. In an environment where multiple services are exposed over Bluetooth, this kind of naming abstraction is of great benefit. The visual tags can be used as both active and passive controls. Active visual tags can be generated dynamically from a PC display (Figure 3). Passive tags can be printed on posters or in magazines, for example. Visual tags have already been tested in marketing posters used for events in Europe. |