LED visible light indoor positioning method and system based on image matching and fingerprint library
An indoor positioning and visible light technology, applied in the field of communications, can solve the problems of low positioning accuracy, poor real-time performance, and short positioning time, and achieve the effects of high positioning accuracy, fast positioning speed, and less time search.
Active Publication Date: 2019-02-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problems of low indoor positioning accuracy and poor real-time performance, and propose a LED visible light indoor positioning method based on image matching and fingerprint database. This method can effectively avoid the influence of multipath on positioning accuracy, and the method realizes positioning The time is short and the complexity of the positioning algorithm is reduced
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[0033] The invention will be described in further detail below in conjunction with the accompanying drawings.
[0034] like figure 1 As shown, the present invention divides the indoor positioning area into several quadrants according to its own needs, and then uniformly grids the specific quadrants, and the grid size is moderate.
[0035] like figure 2 As shown, the whole positioning process of the system of the present invention is divided into two stages, namely: the offline stage and the online stage. In the offline stage, the quadrant-based picture database required for coarse positioning and the grid-based fingerprint required for fine positioning are collected respectively. Database; in the online phase, match the picture library to get the rough positioning quadrant position, and query the fingerprint database to get the fine positioning target position.
[0036] like image 3 As shown, the present invention collects a picture library in the offline stage, and the m...
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The invention discloses an LED visual light indoor positioning method and an LED visual light indoor positioning system based on image matching and a fingerprint database. The positioning method comprises the steps of in an offline period, establishing a quadrant picture fingerprint database and a fingerprint-based gridded quadrant database; in an online period, performing energization and driving a circuit, realizing coverage area illumination by an LED signal source, photographing an LED lamp by a mobile terminal, performing matching with the picture fingerprint database for obtaining a coarse position with relatively high precision, and realizing coarse positioning; then performing searching matching with a multi-parameter fingerprint database by the mobile terminal according to the fingerprint information, and determining position information of the mobile terminal in the area, thereby realizing precise positioning. According to the LED visual light indoor positioning method and the LED visual light indoor positioning system, searching matching between the picture and the picture fingerprint database is performed, thereby realizing coarse positioning. In fine positioning, searching matching between the fingerprint which is received in real time and the data of the fingerprint database is performed, and finally the position of the mobile terminal is determined. Coarse positioning greatly reduces complexity of a subsequent fine positioning algorithm. Searching matching improves positioning speed and positioning precision. The gridded method reduces positioning error.
Description
technical field [0001] The invention relates to an LED visible light indoor positioning method and system based on image matching and fingerprint library, belonging to the technical field of communication. Background technique [0002] Most of the current indoor positioning uses wireless positioning technology, such as using infrared, ultrasonic, bluetooth technology and so on. These technologies can meet people's positioning needs to some extent. However, these positioning technologies have disadvantages such as high power consumption and instability, especially in some special scenarios: such as hospitals and other areas where radio frequency technology is prohibited. The advantages of LED-based visible light communication, such as no electromagnetic interference, wide spectrum, green environmental protection, no need for special auxiliary equipment, and low cost, have attracted widespread attention. [0003] The existing technology includes: a visible light indoor posit...
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IPC IPC(8): H04B10/116G06F16/583G01S5/16
CPCG01S5/16G06F16/5862H04B10/116
Inventor 颜俊何勇祥朱卫平
Owner NANJING UNIV OF POSTS & TELECOMM