CN114124221B - Visible light communication coding method based on camera, conference sign-in system and method - Google Patents

Visible light communication coding method based on camera, conference sign-in system and method Download PDF

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Publication number
CN114124221B
CN114124221B CN202111474399.3A CN202111474399A CN114124221B CN 114124221 B CN114124221 B CN 114124221B CN 202111474399 A CN202111474399 A CN 202111474399A CN 114124221 B CN114124221 B CN 114124221B
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server
conference
sign
mobile phone
control terminal
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CN114124221A (en
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邓洪权
胡诗朋
钟炳辉
万家硕
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Chengdu Aerospace Communication Equipment Co ltd
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Chengdu Aerospace Communication Equipment Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
    • G07C1/10—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people together with the recording, indicating or registering of other data, e.g. of signs of identity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
    • H04M1/72454—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to context-related or environment-related conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention discloses a camera-based visible light communication coding method, a conference sign-in system and a method, which belong to the field of visible light communication and comprise the following steps: after the original data of the transmitting end is copied and expanded, the low-speed data stream is converted into a high-speed data stream, and then the high-speed data stream is loaded onto a visible light source through coding; the receiving end captures a slow data stream signal in the high-speed data stream signal from the visible light source by using a camera, and restores the original data of the transmitting end through sampling judgment. The invention overcomes a series of problems that the traditional check-in mode consumes long time, replaces check-in of other people and the like.

Description

Visible light communication coding method based on camera, conference sign-in system and method
Technical Field
The invention relates to the field of visible light communication, in particular to a camera-based visible light communication coding method, a conference sign-in system and a conference sign-in method.
Background
The current meeting sign-in still adopts a traditional mode, a participant signs in a handwriting sign-in book to roll calls, the mode is time-consuming, the participant is required to wait in a queue, and sometimes even people replace others to sign in. The traditional sign-in mode has the problems of long time consumption, sign-in replacement of others and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a camera-based visible light communication coding method, a conference sign-in system and a method, which overcome a series of problems of long time consumption, replacement of sign-in of others and the like of a traditional sign-in mode.
The invention aims at realizing the following scheme:
a visible light communication coding method based on a camera comprises the following steps: after the original data of the transmitting end is copied and expanded, the low-speed data stream is converted into a high-speed data stream, and then the high-speed data stream is loaded onto a visible light source through coding; the receiving end captures a slow data stream signal in the high-speed data stream signal from the visible light source by using a camera, and restores the original data of the transmitting end through sampling judgment.
Further, the transmitting end is an LED lamp controller, the code is Manchester code, the camera is a mobile phone camera, and the visible light source is an LED lamp.
A conference sign-in system based on the method described above, comprising: conference sign-in control terminal, user's smart phone, LED lamp controller and server; the user side intelligent mobile phone comprises a front camera, a mobile phone CPU, a mobile network module and a mobile phone interaction interface; the mobile phone interaction interface of the user terminal is connected with a mobile phone CPU, the mobile phone CPU is connected with a front-end camera and a mobile network module, the mobile network module is connected with the Internet, the Internet is connected with a server, the server is connected with an LED controller, and the LED controller is connected with an LED lamp; the conference sign-in control terminal is connected with the Internet and is connected with the server through the Internet; the front camera and the LED lamp perform visible light communication based on the visible light communication coding method as set forth in claim 2.
Further, the conference sign-in control terminal is a mobile phone or a conference room computer.
Further, the conference sign-in control terminal is connected with a timer.
A conference sign-in method based on the conference sign-in system as claimed in any one of the above, comprising the steps of:
s1, after a main party starts roll call, a conference sign-in control terminal sends a specific sequence for verification to a server, the server reserves the specific sequence and sends the specific sequence to an LED lamp controller, and the LED lamp controller loads the specific sequence on an LED lamp in a mode of the visible light communication coding method in claim 2;
s2, converting the optical signals captured by the front camera of the user side smart phone from the LED lamp into electric signals, then reducing a specific sequence through sampling judgment, integrating the sequence containing user identity information with the specific sequence by the user side smart phone, and then sending the integrated sequence to a server;
s3, the server determines the identity of the signout person by comparing the specific sequence from the conference signing-in control terminal and the sequence containing the user identity information from the user intelligent mobile phone, and records whether the signing-in is successful or not in the server;
s4, the server processes the check-in information recorded in the step S3, compares a pre-stored participating list, sends feedback information to the conference check-in control terminal after determining non-participating persons, and informs a main participant through an interaction interface of the conference check-in control terminal, and the main participant determines whether the main participant is absent according to the feedback information.
Further, when the conference check-in control terminal is a conference computer: the step S1 includes the sub-steps of: a main meeting person sends an opening signal instruction to a server through a meeting computer, and the server opens a roll call channel after receiving the opening signal instruction; the step S4 includes the sub-steps of: a host sends a closing signal instruction to a server through a conference computer, and the server closes a roll call channel after receiving the closing signal instruction; or alternatively, the process may be performed,
when the conference sign-in control terminal is a mobile phone, the step S1 includes the following sub steps: the server receives an opening signal from the mobile phone to realize opening of the roll call channel; the step S4 includes the sub-steps of: and the server receives a closing signal instruction from the mobile phone to close the roll call channel.
Further, in step S4, the conference sign-in control terminal is connected to a timer, and the master person selects a period of time for circularly sending the roll call information, and automatically sends a control signal to the server after the time of the time reaches the timing, thereby closing the roll call channel.
Further, before step S1, a conference sign-in preparation step is included: before the meeting roll call is started, the user side smart phone is horizontally placed on a desktop, so that a front camera of the smart phone faces to an LED lamp above a meeting room, and an APP application and a mobile data network running on the user side smart phone are opened.
The beneficial effects of the invention are as follows:
the method provided by the embodiment of the invention solves a series of problems that the traditional check-in mode consumes long time and replaces check-in of other people. Specifically, the roll call is signed in through the visible light communication of the LED lamp and the front camera of the smart phone, under the condition that normal illumination of the LED lamp is not affected, roll call information is sent to the camera of the smart phone through the visible light communication by the LED lamp, roll call operation is completed through the mobile phone, roll call time is saved, delay to the teaching time is reduced, and because the LED light rays are transmitted along the sight distance, only users under the LED lamp can answer, and roll call reliability is improved. The conference sign-in control terminal can select the duration that the LED lamp continuously transmits roll call information, so that other users can be prevented from sign-in by other users through the mobile phone sign-in back side.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a coding schematic diagram of an embodiment of the present invention.
Fig. 2 is a decoding schematic diagram of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of the present invention.
FIG. 4 is an environmental schematic of an embodiment of the present invention.
Detailed Description
All of the features disclosed in all of the embodiments of this specification, or all of the steps in any method or process disclosed implicitly, except for the mutually exclusive features and/or steps, may be combined and/or expanded and substituted in any way.
The technical conception, the working principle, the working process and the beneficial effects of the invention are further described in detail below with reference to fig. 1 to 4.
The technical conception of the invention: the invention aims to solve the problems in the background, and overcomes a series of problems of long time consumption, replacement of check-in of other people and the like in the traditional check-in mode. We observe that with the continuous development of society, smart phones with front-facing cameras have penetrated the aspects of our lives. However, since the smart phone cameras on the market do not have higher response speed, the response speed is generally lower than 30 frames per second, if the flickering frequency of the LED lamp is matched with the receiving frequency of the camera, the LED lamp is necessarily caused to be seriously stroboscopic, and the LED lamp can be distinguished by naked eyes, so that the lighting effect of the lamp is affected. In order to overcome the defects and shortcomings of the prior art, the invention provides a scheme based on visible light communication, and the scheme is applied to meeting sign-in scenes. In specific application, a visible light conference sign-in scheme based on a smart phone camera is provided.
The working principle of the invention is as follows: firstly, the invention provides a visible light communication coding method for realizing a camera of a smart phone. As shown in fig. 1, after the LED lamp controller copies and expands the signal, the low-speed data stream is converted into the high-speed data stream, then the signal is loaded onto the LED lamp through manchester encoding, the smart phone camera can just capture the slow-speed stream signal in the high-speed signal stream, and the transmitted signal can be restored through sampling judgment. For example, the slow data stream speed is 4bit/s, and the camera should sample and judge four times in one second, so as to extract the data sent by the LED lamp. The decoding process is as shown in fig. 2, the polarity of the data received by the camera cannot be determined, but this situation can be tolerated by the conference sign-in system, and the specific sequence for authentication and the bit reversal of the specific sequence sent by the subsequent LED are equally valid.
As shown in fig. 3, the present invention further provides a conference sign-in system, which includes a conference sign-in control terminal, a user side smart phone, an LED lamp, and an LED lamp controller, where the user side includes a front camera of the mobile phone, a CPU of the mobile phone, a mobile network module, and a mobile phone interaction interface; the mobile phone interaction interface of the user side is connected with a mobile phone CPU, the mobile phone CPU is connected with a mobile phone front-end camera and a mobile phone mobile network module, the mobile phone mobile network module is connected with the Internet, the Internet is connected with a server, the server is connected with an LED controller, and the LED controller is connected with an LED lamp; the conference sign-in control terminal is connected with the Internet, and the Internet is connected with the server; the front camera of the mobile phone and the LED lamp adopt visible light communication. The conference sign-in control terminal is a mobile phone or a conference room computer.
The working process of the invention comprises the following steps: when meeting roll call, the main meeting person can start roll call at any time, at the moment, the user should place the mobile phone on the desktop horizontally, the front camera of the mobile phone faces to the LED lamp above the meeting room, and the mobile phone APP and the mobile data network are opened. After a teacher starts roll call, the conference sign-in control terminal sends a specific sequence for verification to the server, the server reserves the specific sequence and sends the specific sequence to the LED lamp controller, and the LED lamp controller loads the specific sequence on the LED lamp in the coding mode. The user side smart phone camera converts the optical signal captured from the LED lamp into an electric signal through the prior art, a specific sequence is restored through sampling judgment, the user side smart phone integrates the sequence containing user identity information with the specific sequence and then sends the integrated sequence to the server, the server can record whether the check-in is successful in the server by comparing the specific sequence from the conference check-in control terminal with the specific sequence from the user side smart phone, and the server can determine the identity of the checked-in person due to the fact that the user identity information sequence and the specific sequence for verification are contained in the sequence from the user side. Because the user list of the meeting corresponding to the time of the main meeting person is stored in the server, the server processes the check-in information, compares the meeting list, sends feedback information to the meeting check-in control terminal after determining the non-meeting person, and informs the main meeting person through the interactive interface, and the main meeting person determines whether the person is absent according to the feedback information.
The mobile phone for signing in of the user can be provided with a mobile phone APP, the mobile phone APP is provided with a signing in interface for inputting signing in information, the signing in information is a basic technology in the field of computer development, and the development of the APP can be realized by adopting the existing disclosed program. The mobile phone can attach information such as names to original information through a mobile data network and transmit the information to the server when the user clicks and submits the information through a mobile phone interaction interface, namely a mobile phone touch screen, the server processes the data to judge which user sends the received information, and the server feeds a checked-in list and a non-checked-in list back to a classroom check-in control terminal for a main meeting person to know attendance of the meeting person.
The conference sign-in control terminal is a conference computer, a host sends an instruction to the server through the conference computer, and the server opens a roll call channel to receive sign-in information transmitted by a user mobile phone or receives a closing signal to close the roll call channel. Of course, a smart phone may also be used to send the control signal to the server. The conference sign-in control terminal is connected with the timer, and a master can select the time length for circularly sending roll call information, and automatically sends a control signal to the server after the time of the time reaches the time, so that the roll call channel is closed.
Example 1: a visible light communication coding method based on a camera comprises the following steps: after the original data of the transmitting end is copied and expanded, the low-speed data stream is converted into a high-speed data stream, and then the high-speed data stream is loaded onto a visible light source through coding; the receiving end captures a slow data stream signal in the high-speed data stream signal from the visible light source by using a camera, and restores the original data of the transmitting end through sampling judgment.
Example 2: based on embodiment 1, the transmitting end is an LED lamp controller, the code is manchester code, the camera is a mobile phone camera, and the visible light source is an LED lamp.
Example 3: on the basis of embodiment 2, a conference sign-in system based on embodiment 2 includes: conference sign-in control terminal, user's smart phone, LED lamp controller and server; the user intelligent mobile phone comprises a front camera, a mobile phone CPU, a mobile network module and a mobile phone interaction interface; the mobile phone interaction interface of the user terminal is connected with the mobile phone CPU, the mobile phone CPU is connected with the front-end camera and the mobile network module, the mobile network module is connected with the Internet, the Internet is connected with the server, the server is connected with the LED controller, and the LED controller is connected with the LED lamp; the conference sign-in control terminal is connected with the Internet and is connected with the server through the Internet; the front camera and the LED lamp perform visible light communication based on the visible light communication coding method as claimed in claim 2.
When the method is applied specifically, the conference sign-in control terminal is a mobile phone or a conference room computer.
When the method is applied specifically, a timer is connected to the conference sign-in control terminal.
Example 4: a conference sign-in method based on the conference sign-in system of embodiment 3, comprising the steps of:
s1, after a main party starts roll call, a conference sign-in control terminal sends a specific sequence for verification to a server, the server reserves the specific sequence and sends the specific sequence to an LED lamp controller, and the LED lamp controller loads the specific sequence on an LED lamp in a visible light communication coding method in claim 2;
s2, converting the optical signals captured by the front camera of the user side smart phone from the LED lamp into electric signals, then reducing the electric signals into specific sequences through sampling judgment, and transmitting the sequences containing user identity information and the specific sequences to a server after integrating the sequences by the user side smart phone;
s3, the server determines the identity of the signout person by comparing the specific sequence from the conference signing-in control terminal and the sequence containing the user identity information from the user intelligent mobile phone, and records whether the signing-in is successful or not in the server;
s4, the server processes the check-in information recorded in the step S3, compares a pre-stored participating list, sends feedback information to the conference check-in control terminal after determining non-participating persons, and informs a main participant through an interaction interface of the conference check-in control terminal, and the main participant determines whether the main participant is absent according to the feedback information.
When the conference sign-in control terminal is a conference computer, in the specific application: the step S1 includes the sub-steps of: a main meeting person sends an opening signal instruction to a server through a meeting computer, and the server opens a roll call channel after receiving the opening signal instruction; the step S4 includes the sub-steps of: a host sends a closing signal instruction to a server through a conference computer, and the server closes a roll call channel after receiving the closing signal instruction; or alternatively, the process may be performed,
when the conference sign-in control terminal is a mobile phone, the step S1 includes the following sub steps: the server receives an opening signal from the mobile phone to realize opening of the roll call channel; the step S4 includes the sub-steps of: and the server receives a closing signal instruction from the mobile phone to close the roll call channel.
In the specific application, in step S4, the conference sign-in control terminal is connected with a timer, and the master person selects the time length for circularly sending the roll call information, and automatically sends a control signal to the server after the time reaches the timing time, so as to close the roll call channel.
In specific application, before step S1, a conference sign-in preparation step is included: before the meeting roll call is started, the user side smart phone is horizontally placed on a desktop, so that a front camera of the smart phone faces to an LED lamp above a meeting room, and an APP application and a mobile data network running on the user side smart phone are opened.
The inventive functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium and executing all or part of the steps of the method according to the embodiments of the present invention in a computer device (which may be a personal computer, a server, or a network device, etc.) and corresponding software. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, and an optical disk, and test or actual data exist in a read-only memory (Random Access Memory, RAM), a random access memory (Random Access Memory, RAM), and the like in program implementation.

Claims (5)

1. A conference sign-in method, characterized in that the method is based on a conference sign-in system, said conference sign-in system comprising: conference sign-in control terminal, user's smart phone, LED lamp controller and server; the user side intelligent mobile phone comprises a front camera, a mobile phone CPU, a mobile network module and a mobile phone interaction interface; the intelligent mobile phone interaction interface of the user side is connected with a mobile phone CPU, the mobile phone CPU is connected with a front-end camera and a mobile network module, the mobile network module is connected with the Internet, the Internet is connected with a server, the server is connected with an LED controller, and the LED controller is connected with an LED lamp; the conference sign-in control terminal is connected with the Internet and is connected with the server through the Internet; the front camera and the LED lamp carry out visible light communication based on a visible light communication coding method; the visible light communication-based coding method comprises the following steps: after the original data of the transmitting end is copied and expanded, the low-speed data stream is converted into a high-speed data stream, and then the high-speed data stream is loaded onto a visible light source through coding; the receiving end captures a slow data stream signal in a high-speed data stream signal from a visible light source by using a camera, and restores original data of the transmitting end through sampling judgment, and the method comprises the following steps:
s1, after a main party starts roll call, a conference sign-in control terminal sends a specific sequence for verification to a server, the server reserves the specific sequence and sends the specific sequence to an LED lamp controller, and the LED lamp controller loads the specific sequence on an LED lamp in a visible light communication coding method;
s2, converting the optical signals captured by the front camera of the user side smart phone from the LED lamp into electric signals, then reducing a specific sequence through sampling judgment, integrating the sequence containing user identity information with the specific sequence by the user side smart phone, and then sending the integrated sequence to a server;
s3, the server determines the identity of the signout person by comparing the specific sequence from the conference signing-in control terminal and the sequence containing the user identity information from the user intelligent mobile phone, and records whether the signing-in is successful or not in the server;
s4, the server processes the sign-in information recorded in the step S3, compares a pre-stored participant list, sends feedback information to a conference sign-in control terminal after determining non-participant, and informs a main participant through an interaction interface of the conference sign-in control terminal, and the main participant determines whether the main participant is out of duty according to the feedback information; in step S4, the conference sign-in control terminal is connected with a timer, and a host selects a period of time for circularly sending roll call information, and automatically sends a control signal to a server after the time reaches the timing, thereby closing a roll call channel;
when the conference sign-in control terminal is a conference computer: the step S1 includes the sub-steps of: a main meeting person sends an opening signal instruction to a server through a meeting computer, and the server opens a roll call channel after receiving the opening signal instruction; the step S4 includes the sub-steps of: a host sends a closing signal instruction to a server through a conference computer, and the server closes a roll call channel after receiving the closing signal instruction;
or alternatively, the process may be performed,
when the conference sign-in control terminal is a mobile phone, the step S1 includes the following sub steps: the server receives an opening signal from the mobile phone to realize opening of the roll call channel; the step S4 includes the sub-steps of: and the server receives a closing signal instruction from the mobile phone to close the roll call channel.
2. The conference sign-in method of claim 1, wherein the transmitting end is an LED lamp controller, the encoding is manchester encoding, the camera is a cell phone camera, and the visible light source is an LED lamp.
3. The conference sign-in method according to claim 1, wherein the conference sign-in control terminal is a mobile phone or a conference room computer.
4. Conference sign-in method according to claim 1, characterized in that the conference sign-in control terminal is connected with a timer.
5. The conference sign-in method according to claim 1, characterized by comprising, before step S1, a conference sign-in preliminary step: before the meeting roll call is started, the user side smart phone is horizontally placed on a desktop, so that a front camera of the smart phone faces to an LED lamp above a meeting room, and an APP application and a mobile data network running on the user side smart phone are opened.
CN202111474399.3A 2021-12-06 2021-12-06 Visible light communication coding method based on camera, conference sign-in system and method Active CN114124221B (en)

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