RGB MIMO Optical Camera Communication with Histogram Equalization

Unlike the conventional visible light communication (VLC) adopting photo detectors (PD), optical camera communications (OCC) with the rolling shutter effect is considered for the new VLC standard 802.15.7r1. This is because conventional VLC requires additional devices for communication purpose. But as the smart devices have embedded cameras, so OCC could be used in smart devices without any additional device for communications. In this paper, red, green, and blue (RGB) light-emitting-diodes (LEDs) are used to increase the OCC transmission capacity via wavelength-division-multiplexing (WDM). The signals from each RGB-LEDs are distinguished by the RGB filter in a camera. But the rolling shutter effect in OCC causes the blooming effect among pixels causing errors in the signals. To reduce the errors, in this work, we have proposed and demonstrated Histogram equalization (HE) to overcome the blooming effect from the image.