Directable data transmission with digital lighting and camera

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This research developed a data communication system with a digital camera equipped on a mobile internet devices such as smartphones. It reads embedded data by decoding the patterns of varying color intensities from the movies that capture objects lightened by color LED bulbs.Our transmitter intentionally controls the colors of the LEDs according to the encoded data for delivering relevant information, and a receiver decodes it by detecting their variations with ordinary image sensors, by which existing technologies such as two-dimensional codes or near field communication can be replaced for appropriate environmental conditions.This technology requires no special devices capable for modulating or sensing visible lights at high frequencies, which used in existing visible lighting communications. Our system can be implemented with commercial smartphones and digitally controllable color LED lightings, which is suited to develop communication devices at very low cost.