Abstract
An improved particle filter algorithm based on Cam-Shift algorithm applied to outdoor visible light communication (outdoor-VLC) is presented in this paper. In the outdoor-VLC system, accurately and completely tracking and extracting the target signal source Light Emitting Diode (LED) area is the premise for realizing communication. However, few existing studies pay attention to it. In the dynamic outdoor environment, there will be a lot of different environmental interferences (such as background interference, similar object interference, etc.), which greatly increases the difficulty of tracking and extracting the target signal source LED area. Therefore, in this paper, an improved tracking algorithm is proposed to solve the problem of how to track and extract the target signal source LED area accurately, stably and in real time in the outdoor-VLC system under various environmental interferences, so as to increase the feasibility of practical application of VLC system in outdoor scenes. This improved algorithm combines the particle filter algorithm and Cam-Shift algorithm originally. Experimental results show that the proposed algorithm has good accuracy, robustness and real-time performance under the environment of multiple interference factors. Accordingly, the proposed algorithm can be applied to the outdoor-VLC system with various environmental interferences, and can realize the actual first step of communication in VLC system based on image sensor well, laying a foundation for feature extraction, data transmission and other subsequent steps.
Highlights
Visible light communication (VLC) is a wireless communication method which applies the visible light as a carrier for the data
An improved particle filter algorithm based on Cam-Shift algorithm applied to outdoor visible light communication is presented in this paper
In the outdoorVLC system, accurately and completely tracking and extracting the target signal source Light Emitting Diode (LED) area is the premise for realizing communication
Summary
Visible light communication (VLC) is a wireless communication method which applies the visible light as a carrier for the data. A VLC system based on PD receives the light intensity of different LEDs to realize communication so that it costs less and has a fast response time. It can be found that when the interference of the direction of the light beam, the background light or the reflection of surrounding objects occurs on PD, the PD-based communication would be greatly affected and even fail. The other receiver, the image sensor can directly capture images to obtain the angle and distance of the light source and other information. It can separate the signals from different light sources so that it is difficult to be affected by the ambient light. According to the characteristics of PD and image sensor above, the image sensor performs better in outdoor-VLC application field
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