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Bokode encodes information in the bokeh of an image
A Bokode tag taken in and out-of-focus.

A bokode is a type of data tag which holds thousands of times more information than a barcode. They have been developed by a team at the MIT Media Lab.[1] The bokode pattern is a tiled series of Data Matrix codes. The name is a portmanteau of the words bokeh (a photographic term) and barcode. They are much smaller than a barcode, and are circular in shape with a diameter of 3mm. A bokode consists of an LED, covered with a mask and a lens. They are readable from different angles and from 4 meters (13 feet) away by a SLR camera. Currently they are expensive to produce as the LED requires power, but there are prototypes which rely just on reflected light. There is a privacy advantage compared to Radio-frequency identification tags: bokodes can be covered up, whereas active as well as passive RFID tags can be read at a distance with equipment that can receive radio signals.[2]

References

  1. ^ Barcode replacement shown off, BBC News, 27 July 2009.
  2. ^ Ankit Mohan, Grace Woo, Shinsaku Hiura, Quinn Smithwick, Ramesh Raskar: Bokode: Imperceptible Visual Tags for Camera Based Interaction from a Distance, Camera Culture Group, MIT Media Lab.

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