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Screen-camera communication system sampling method based on frame splicing

A communication system and screen technology, applied in the field of optical communication, can solve the problems of sampling frame rate fluctuation, asynchronous sampling process, wrong sampling, etc., and achieve the effect of adaptive sampling and reducing the bit error rate.

Active Publication Date: 2021-09-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a screen-camera communication system sampling method based on frame splicing, and perform adaptive splicing of double-sampled image frames in screen-camera communication, thereby solving the problem of asynchronous sampling process and Error sampling problem caused by sampling frame rate fluctuation

Method used

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  • Screen-camera communication system sampling method based on frame splicing
  • Screen-camera communication system sampling method based on frame splicing
  • Screen-camera communication system sampling method based on frame splicing

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Embodiment

[0054] figure 1 It is a flow chart of the sampling method of the screen-camera communication system based on frame splicing in the present invention.

[0055] In this example, if figure 1 As shown, a kind of screen-camera communication system sampling method based on frame splicing of the present invention comprises the following steps:

[0056] S1. Arranging an array of signal points on the screen image frame according to the screen pixel resolution;

[0057] In this example, if figure 2 As shown, set the screen pixel resolution as M×N=768×1366, set the signal points and check digits as square blocks, whose side length is equal to H=6 screen pixel lengths, and the distance between adjacent signal points is D= 4 screen pixel lengths; then arrange the check digits and signal point arrays on the screen image frame, wherein the check digits are arranged in the first row and the last row, the first column and the last column, and the middle area is arranged for After the sign...

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Abstract

The invention discloses a screen-camera communication system sampling method based on frame splicing, and the method comprises the steps: carrying out the data coding of to-be-transmitted information through a screen-camera communication system, and converting the to-be-transmitted information into parallel coding symbols; modulating the same path of coding symbols to the same signal point of different signal image frames, so continuous signal image frames carrying coding information are obtained; then setting a row / column check bit for each frame of signal image frame, completing sampling of the signal image frame through a camera, detecting whether the sampling image frame is correctly sampled through the set row check bit, and determining whether the adjacent sampling image frame samples the same signal frame; distinguishing correct and wrong sampling rows in a sampling image frame through a set column check bit, then determining a splicing position according to the row check bit and the column check bit and performing frame splicing; finally, completing the demodulation and decoding operations of the sampled image frame, and obtaining a bit stream of serial output.

Description

technical field [0001] The invention belongs to the technical field of optical communication between a screen and a camera, and more specifically relates to a sampling method for a screen-camera communication system based on frame splicing. Background technique [0002] Screen-camera communication is a visible light communication technology. The sending end modulates the communication data into a brightness signal in the form of an array on the signal image frame, and drives the screen to send out an array of visible light modulation signals; Sampling is performed to obtain sampled image frames and demodulated to recover communication data. [0003] The screen-camera communication is asynchronous communication. Asynchronous communication usually adopts double sampling, that is, the camera samples the image signal at a sampling frame rate twice that of the screen display frame rate. stable time), another sampling point must appear in the middle of the signal holding time, so...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/951H04N23/80
Inventor 凌云邹金明邱昆胡钢
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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