High-precision Indoor Visible Light Positioning with Tilt Receiver Based on Image Sensors

In recent years, visible light positioning (VLP) based on image sensors has been widely studied as the demand for indoor precise positioning services are increasing. We use commercial light emitting diodes (LEDs) as the transmitter and a commercial mobile phone or stereo camera as the receiver to acquire a fringe picture carrying information through the rolling shutter effect of the complementary metal oxide semiconductor (CMOS) image sensor. Based on this, the algorithm is proposed in this paper, either two dimensional positioning with the phone rotated at any angle in the horizontal plane, or further extension, three dimensional positioning with the stereo camera tilted at any rotation angle, can achieve good positioning effectiveness. Meanwhile, it also avoids the use of angle sensors that cannot provide reliable and accurate angle measurements continuously. The experimental results show that the system established in this paper is capable of achieving centimeter-level positioning accuracy.