Method for eliminating background light disturbance in camera-equipped indoor visible light positioning system
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A positioning system and camera technology, applied in the field of visible light communication, can solve problems such as background light disturbance and affecting positioning stability, and achieve the effect of improving accuracy and stability
Active Publication Date: 2016-03-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0003] The purpose of the present invention is to solve the problem that the background light disturbance affects the positioning stability in the existing system using the camera for indoor positioning, and to provide a method for eliminating background light disturbance in the camera indoor visible light positioning system and a positioning system based on this method
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Embodiment 1
[0042] A method for eliminating background light disturbance in the camera indoor visible light positioning system of the present invention and its positioning system, the process of which is as follows figure 1 As shown, the block diagram of the positioning system is shown in figure 2 As shown, the specific implementation includes the following steps:
[0043] Step 1. Assign frequency to each LED in the LED array, that is, each LED sends a periodic signal corresponding to the assigned frequency. At the sending end, a processor is used to generate a periodic signal of the assigned frequency and drive the LED to send a visible light periodic signal. ;
[0044] Among them, the processor in step 1 corresponds to figure 2 The downlink transmit processor in ;
[0045] The LED array in step 1 refers to the collection of all LEDs for indoor visible light positioning; the periodic signal can be either a sine wave periodic signal or a square wave periodic signal; the visible light...
Embodiment 2
[0068] This embodiment discloses a positioning system constructed according to the present invention "A Method for Eliminating Background Light Disturbance in Camera Indoor Visible Light Positioning System", as shown in the attached figure 2 shown. Depend on figure 2 It can be seen that the positioning system relied on by the method of the present invention includes two parts, the visible light downlink transmitting module and the intelligent terminal, specifically:
[0069] The visible light downlink transmission module further includes: a downlink transmission processor, an LED drive circuit and an LED array;
[0070] Wherein, in the present embodiment, the downlink sending processor adopts FPGA to generate codes and realizes, and also can adopt single-chip microcomputer to realize, and adopts a plurality of white light LEDs in the LED array, is 3 in the present embodiment;
[0071] Wherein, the single-chip microcomputer or FPGA of the downlink sending processor is used ...
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Abstract
The invention relates to a method for eliminating a background light disturbance in a camera-equipped indoor visible light positioning system, wherein the method belongs to the technical field of visible light communication. According to the method, LEDs asynchronously transmit signals. A plurality of times of iteration averaging are adopted for eliminating the background light disturbance in the signals which are detected by the camera, thereby realizing more stable indoor visible light positioning. The method is characterized in that different-frequency signals are exerted on different LEDs; the signals which are transmitted by the LEDs are received by the camera, an image is formed through the signals and is converted to a gray scale image; iteration averaging is performed on continuous N gray scales in the gray scale image; the gray scale which is obtained through interaction average of the N gray scales is subtracted from the gray scale of the gray scale image, namely elimination of background light disturbance is realized; then fast Fourier transformation (FFT) is performed on the signal after background light disturbance elimination; a frequency which corresponds with an amplitude spectrum peak value is acquired; the above processes are repeated for M times; a largest frequency in the results of M times of processes is compared with a built-in LED frequency-coordinate database in an intelligent terminal; and the coordinate of the LED lamp is obtained, namely positioning is realized.
Description
technical field [0001] The invention relates to a method for eliminating background light disturbance in an indoor visible light positioning system of a camera, and belongs to the technical field of visible light communication. Background technique [0002] The indoor positioning solution based on visible light communication (VisibleLightCommunication, VLC) technology has two major advantages: 1) using white light emitted by semiconductor light-emitting diodes (LightEmittingDiode, LED) as the carrier of positioning signals, there is no electromagnetic radiation, and it is not limited by the application environment; 2) ) The indoor positioning system based on VLC technology is compatible with future LED lighting, does not require expensive hardware equipment investment, and has a relatively low cost. In recent years, in the method of indoor visible light positioning using mobile phone cameras, there are usually the following defects: random changes in background light includi...
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