Data signal modulation scheme based on perceptually uniform color space for image sensor-based visible light communication

Abstract

In digital signage and image sensor-based visible light communication, a LED-backlight display (digital signage) is used as a transmitter and a hand-held camera (image sensor) device is used as a receiver. Data signals are embedded on image contents projected by the transmitter and sent to the receiver by visible light communication. In this system, there is a problem that embedded data signals may be perceived by human eyes as the degradation of visual quality. In order to solve this problem, we aim to realize a visible light communication system that is difficult to be perceived using the characteristics of human color perception. In this paper, we propose a scheme to embed data signals using perceptually uniform color spaces considering human color perception, and compare it to the conventional scheme. We clarify the relationship between visual quality and communication quality from the relationship between the magnitude of change in color perceived by human eyes and the bit error rate of received data signals.