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We present "screen codes" - a space- and time-efficient, aesthetically compelling method for transferring data from a display (e.g. a VDU or projected public display) to a camera equipped mobile device. Screen codes encode data as a grid of luminosity fluctuations within an arbitrary image, displayed on the video screen. These fluctuations, manifested as a "twinkling" within the image, are observed by the mobile device over time and decoded to reconstruct the data. Observation is passive; there is no back-channel from the camera to the display. Novel spatial and temporal coding strategies are employed, tailored to channel noise conditions. The display may be observed from any angle or orientation.
Date of Conference: 27-28 Nov. 2007