A study on modulation and diversity methods based on uniform color space for digital signage and image sensor-based VLC

We consider a visible light communication (VLC) system using a digital signage and an image sensor. In order not to impair the visual quality of the background image of digital signage, modulation is performed by changing its color components by taking advantage of the fact that changes in specific color components are difficult for the human eyes to perceive. In previous studies, modulation was based on only one color component, and the communication quality depended on what background image was used. In this study, we propose a modulation method in which the background image does not affect the communication quality by multiplexing the modulation with two color components and applying diversity demodulation. The proposed method is evaluated by a trade-off evaluation of communication quality and quantitative visual quality, and shows the best result regardless of the background image. In addition, the visual quality is improved by using uniform color space that provides uniform color changes for the human eyes.