Research On High Precision Indoor Visible Light Positioning Algorithm Based On Image Sensor

With the rapid development of wireless networks and the popularity of mobile terminals,location service-based indoor positioning technology has broad application prospects.The indoor positioning technology based on visible light communication(VLC)employs the LED lamps as the transmitter to transmit the ID information,and the positioning terminal realizes indoor positioning through the photoelectric detector or the camera.In contrast to the traditional indoor positioning technologies,the VLC positioning technology has the advantages of high positioning accuracy,no electromagnetic interference,and environmental friendly.In this paper,the indoor VLC positioning method based on CMOS image sensor has been deeply studied from the following aspects,the identification of the LED-ID,the positioning accuracy,the realtime ability of the positioning and the robustness of the positioning system.And experimental platforms are separately constructed to verify the proposed algorithms.The main innovations and research results of this paper are as follows:1?The LED-ID optical barcode modulation and recognition algorithm based on VLC is designed.The traditional LED-ID recognition method based on visible light imaging communication exists some problems,such as less address of LED-ID,low recognition rate,short transmission distance,poor anti-interference ability and so on.Therefore,this paper proposes a LED-ID optical barcode modulation and recognition algorithm.The LEDs are modulated and assigned different features to the LED-ID optical barcode captured by the CMOS sensor instead of transmitting data.Using basic image processing techniques,the features of LED-ID are successfully extracted,and then the accurate recognition of LED-ID is realized.The proposed algorithm is verified by an experiment.2?A high precision VLC 3-D positioning algorithm based on double LEDs using image sensor is designed in this paper.For the VLC positioning system,both accuracy and real-time ability should be considered.In this paper,a high precision visible light positioning algorithm based on double LEDs using CMOS image sensor is proposed,which has a satisfactory realtime performance.And the effectiveness of the proposed algorithm is verified by setting up an experiment.3?The design of VLC-based mobile terminal tracking dynamic location algorithm.At present,most of the researches based on VLC indoor positioning are limited to static positioning,and the robustness of positioning system is poor(such as the occlusion effect,speed jump of the positioning terminal and the interference from the other light sources).This paper presents a VLC dynamic tracking positioning algorithm based on improved Camshift-Kalman to replace the traditional pixel intensity detection method of the LED pixel area,which can greatly improve the robustness of VLC positioning system while the real-time performance and positioning accuracy are guaranteed.The effectiveness of the proposed algorithm is verified by an experiment.Last but not the least,comprehensive experimental verification is carried out by building a VLC-based mobile robot positioning platform.The LED-ID modulation and recognition algorithm,VLC image positioning algorithm based on double LEDs and VLC dynamic tracking and detection algorithm,are comprehensively validated.