Visible light communication method for compensating non-uniform illumination based on camera
A technology for uneven illumination and visible light communication, which is applied in the field of visible light communication, and can solve problems such as ambient light interference, compensation for uneven illumination, and high bit error rate
Active Publication Date: 2020-03-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problem of high bit error rate and unstable performance caused by ambient light interference when high-order amplitude shift keying modulated LEDs are used for camera-based visible light communication caused by uneven brightness of pictures, and a compensation method is proposed. Visible light communication method based on camera with uneven illumination
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Embodiment 1
[0107] This embodiment adopts the method of the present invention to build a visible light communication system. The system described in this embodiment is the same as that described by the main body of the invention, including a signal source, a data receiving module, a data conversion module, an LED drive circuit, an LED light board, Camera, image preprocessing module, illumination unevenness compensation module and dynamic quantization interval judgment module, the system structure diagram is as follows figure 1 shown.
[0108] The source contains a computer a;
[0109] Wherein, the computer a is used to generate the data to be sent by the user, and send the data to be sent by the user to the data receiving module;
[0110] The data receiving module includes an FPGA development board a;
[0111] Among them, the FPGA development board a is used to convert the user data sent by the source into a binary data stream and send it to the data conversion module;
[0112] The dat...
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The invention relates to a visible light communication method for compensating non-uniform illumination based on a camera, and belongs to the technical field of visible light communication. The methodcomprises an information source, an LED drive circuit, an LED lamp panel, a camera, a data receiving module, a data conversion module, a picture preprocessing module, an illumination non-uniformity compensation module and a dynamic quantization interval judgment module. The method comprises the following steps: acquiring brightest and darkest data and an illumination compensation coefficient sequence; converting data to be sent by a user and sent by an information source into binary data and then grouping the binary data; generating a data frame to drive an LED circuit and amplifying an output level, controlling an LED lamp panel to emit a visible light signal subjected to high-order amplitude shift keying modulation, enabling a camera to receive a data picture to carry out gray processing, carrying out illumination non-uniformity compensation and dynamic quantization interval judgment after sorting according to column gray values to acquire a payload data sequence. The method improves the transmission rate of the system, eliminates the problem of uneven illumination and the interference of ambient light on the system, and improves the stability of the system.
Description
technical field [0001] The invention relates to a camera-based visible light communication method for compensating uneven illumination, and belongs to the technical field of visible light communication. Background technique [0002] With the advent of the 5G era, the number of mobile terminals and IoT devices has exploded, posing huge challenges to existing wireless communication technologies in terms of spectrum resources, power consumption, and cost. Visible light communication has the advantages of rich spectrum resources, can be used without authorization, and low cost. Therefore, more and more researchers are focusing on the field of visible light communication. LED is not only low in cost, but also can play the role of daily lighting while communicating, which can save the cost and energy consumption of laying communication equipment. The rolling shutter feature enables the camera to recognize visible light signals higher than the frame rate of the camera, which allow...
Claims
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Login to View More IPC IPC(8): H04B10/116
CPCH04B10/116
Inventor 杨爱英樊文鹏赵昭冯立辉熊亦威
Owner BEIJING INSTITUTE OF TECHNOLOGYGY