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Optical camera communication for active marker identification in camera-based positioning systems

: Gorse, L.; Löffler, C.; Mutschler, C.; Philippsen, M.


Institute of Electrical and Electronics Engineers -IEEE-; Univ. Bremen:
15th Workshop on Positioning, Navigation and Communications, WPNC 2018 : 25th/26th October 2018, Bremen, Germany
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-6437-7
ISBN: 978-1-5386-6436-0
Workshop on Positioning, Navigation and Communications (WPNC) <15, 2018, Bremen>
Fraunhofer IIS ()

Outside-in camera-based localization systems determine the position of mobile objects (with markers attached to them) by observing a tracking area with multiple camera anchors. Up to now the identification of the objects in the camera images only works for close objects (with passive 3-dimensional marker constellations) or when tracking gaps or a slow identification are acceptable (with an active LED that blinks a unique identification code).We present a novel Optical Camera Communication method whose LEDs are never switched off completely to allow continuous tracking. We encode bits with variations of light intensity and show how an outside-in optical localization system can reliably identify the markers within a few frames.The identification works with a bit error ratio of 7.5 10 -5 . It works for moving markers (with speeds of at least up to 4 m/s), for distant markers (with distances of at least up to 44 m), for multiple markers, and under moderate ambient infrared light.