Practical design of Screen-to-Camera based Optical Camera Communication

Abstract

This paper introduces the Optical Camera Communication (OCC) based on Computer Vision. The practical issues of implementation of the asynchronous communication based Screen-to-Camera are performed. The asynchronous scheme proposed by our previous work is modified to be simple, suitable and reliable in order to apply in case of heterogeneous frame rate of camera. In addition, the design of multi LEDs transmitter together with image processing technique are also proposed to mitigate perspective distortion in real-time LEDs detection and multi colors decoding achieving high performance.

Flickering-Free Distance-Independent Modulation Scheme for OCC

“…For example, in [19] a 4-CSK modulation was presented for short range links (less than 1 m), while Hu et al [20] introduced a high level constellation modulation (8-CSK, 16-CSK, and 32-CSK), that needed a synchronization delimiter and periodic calibration packets during the transmission, and complex image processing for the demodulation. In [21,22], an asynchronous CSK scheme was presented for distances below 1 m, and an 8-CSK modulation [23] was presented along with a beacon-jointed packet reconstruction scheme for longer packets, but the system's distance range was strongly limited (less than 5 cm). In [24] the authors defined their technique as Binary CSK.…”