Avoiding Inter-Light Sources Interference in Optical Camera Communication

Optical Camera Communication (OCC) is a promising solution for future wireless communication thanks to the advantages including security, license, and cost-efficiency. Widely available smart devices with em-bedded cameras such as smartphones, tablets, and digital cameras can be employed as receivers in OCC with-out modifying hardware. A complementary metal-oxide-semiconductor (CMOS) sensor in a camera can receive optical signals from multiple light sources at the same time. Since the light source occupies a certain area in the image plane, the received signal powers differ among the corresponding pixels. When the number of light sources increase, the signals from a light source can be blocked by another light source or affected by the blooming effect of other optical signals. However, there has never been a general model for avoiding such interference in OCC. Therefore, in this paper we propose a general model for avoiding inter-light sources interference. The proposed model formulates the constraints with perspective transformation based on the parameters of an image sensor and a camera. We also provide preliminary experimental results to validate the proposed model.