CN116846472A - Visible light communication method between television screen and smart phone - Google Patents
Visible light communication method between television screen and smart phone Download PDFInfo
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- CN116846472A CN116846472A CN202311118000.7A CN202311118000A CN116846472A CN 116846472 A CN116846472 A CN 116846472A CN 202311118000 A CN202311118000 A CN 202311118000A CN 116846472 A CN116846472 A CN 116846472A
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- 238000004891 communication Methods 0.000 title claims abstract description 26
- 239000010410 layer Substances 0.000 claims abstract description 93
- 239000012792 core layer Substances 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 239000000969 carrier Substances 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 2
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Classifications
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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
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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
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5161—Combination of different modulation schemes
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a visible light communication method between a television screen and a smart phone, which relates to the field of visible light communication, and the method realizes parallel transmission of information by dividing the television screen into a template layer, a core layer, a redundant layer and an additional layer; defining a plurality of pixel blocks on a screen, modulating pixel block distribution, demodulation rules and splicing rules by relying on a template layer pixel block, transmitting main information by a core layer, backing up the core layer by a redundancy layer, and providing additional information by an additional layer; capturing television screen information by a camera of the smart phone, and demodulating and splicing according to template layer information; if the core information is damaged, repairing by using redundant information, and finally displaying on the mobile phone. The method has the core advantages of realizing efficient, stable and reliable visible light communication.
Description
Technical Field
The invention relates to the field of visible light communication, in particular to a visible light communication method between a television screen and a smart phone.
Background
With the rapid development of smart phones and internet technology, information transfer systems play an increasingly important role in people's daily lives. Conventional information transmission systems mainly rely on wired or radio wave communication, however, these communication methods may be affected by problems such as interference, signal attenuation, etc. in specific environments, so as to reduce the rate and quality of information transmission. Therefore, research on a novel information transmission system has important practical significance.
In recent years, the visible light communication technology has become a communication system of great interest.
VLC primarily uses the visible light band, i.e., light waves (between about 400 nanometers and 700 nanometers) that are perceivable by the human eye to transmit data. It modulates digital signals into optical wave signals for transmission, VLC has the potential for high bandwidth advantages over other wireless communication technologies because the frequency band of visible light is very broad. In practical applications, VLC can usually achieve transmission rates of several hundred Mbps or even Gbps, but its transmission distance is short, usually between several meters and several tens of meters.
At present, the application of visible light communication between a smart phone and a television is still in an exploration stage, and the challenge of how to efficiently transmit digital information on dense screen pixels needs to be solved. Such applications are of interest in certain situations, such as when the network conditions are poor and the efficiency of the display of the information to be transferred by the television alone is not high enough, or when it is not guaranteed that everyone can watch the information with a heavy head, the communication using the visible light and the communication using the mobile phone is of interest. For example, some confidential information is related, under the condition that the information is inconvenient to directly display on a large screen, a visible light communication signal can be transmitted through a television screen, and only an authorized person can use a smart phone to demodulate the signal to acquire the information after inputting a password.
Disclosure of Invention
The invention aims to provide a visible light communication method between a television screen and a smart phone to solve the problems in the background art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a visible light communication method between a television screen and a smart phone comprises the following steps:
s1: dividing the television screen into a template layer, a core layer, a redundant layer and an additional layer, wherein the template layer is positioned at the central part of the television screen, the core layer is arranged around the template layer, the redundant layer is arranged around the core layer, and the additional layer is arranged around the redundant layer;
s2: dividing a plurality of pixel blocks on a television screen, wherein each pixel block consists of a plurality of pixels in close proximity, and determining the size of the pixel block according to the resolution of the television screen and the resolution of a camera of a smart phone so that the camera can clearly distinguish each pixel block;
wherein only one pixel block is arranged in the template layer;
a plurality of pixel blocks are distributed in the core layer, the redundant layer and the additional layer;
s3: modulating pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule of a television screen to a template layer pixel block;
modulating core information onto a core layer, wherein different pixel blocks on the core layer transmit multiple pieces of different information in parallel;
modulating redundant information onto a redundant layer, wherein the redundant information is identical to core information, and different pixel blocks on the redundant layer transmit multiple pieces of different information in parallel;
modulating the additional information onto the additional layer, wherein different pixel blocks on the additional layer transmit multiple pieces of different information in parallel;
s4: the intelligent mobile phone receives television screen information by using a camera, decodes the information on the received template layer pixel blocks, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a core layer to obtain core information according to pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule obtained by decoding, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a redundant layer to obtain redundant information, and demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on the additional layer to obtain additional information;
s5: the smart phone compares the decoded core information with the redundant information, and when the core information is damaged or incomplete, the core information is supplemented or repaired by the redundant information;
s6: and the intelligent mobile phone combines the redundant information with the supplemented or repaired core information to form final information according to the pixel block information splicing rule and displays the final information on a screen of the intelligent mobile phone.
In some embodiments, during modulation, information to be transmitted in the core layer or the redundant layer or the additional layer is encoded to obtain a continuous digital signal sequence, and the sequence is divided into a plurality of sub-sequences, wherein each sub-sequence corresponds to a pixel block for transmission.
In some embodiments, the modulation process further comprises:
modulating each sub-sequence using PWM or OOK such that each digital bit is converted to a particular brightness or color;
and (3) using an OFDM technology to allocate the sub-sequences modulated by PWM or OOK to different frequency sub-carriers, and mapping the different frequency sub-carriers to different pixel blocks for transmission.
In some embodiments, forward error correction coding is applied for each pixel block in the core layer, improving the reliability of information transmission.
In some embodiments, the forward error correction code is a Reed-Solomon code or an LDPC code
In some embodiments, the information conveyed by the television screen includes, but is not limited to, text, image, sound, and video information.
In some embodiments, the smart phone stores the information transferred in the core layer, the redundant layer and the additional layer to the memory or the hard disk, demodulates the information in the template layer, and then retrieves the information transferred in the core layer, the redundant layer and the additional layer for demodulation after the demodulation of the information in the template layer is completed.
In some embodiments, the method further comprises: before demodulation, the smart phone also needs to input a password. This is particularly true in situations where some sensitive information cannot be displayed directly on a large screen.
The invention has the advantages compared with the prior art that:
1. conventional visible light communication techniques may suffer from the difficulty in identifying individual pixels due to the resolution limitations of the smartphone camera and the pixel density of the television screen. The invention introduces the concept of pixel blocks, each pixel block is composed of a plurality of adjacent pixels, so that the intelligent mobile phone can clearly distinguish and decode the information of each pixel block, thereby greatly improving the accuracy and stability of communication.
2. In the invention, the television screen is divided into the template layer, the core layer, the redundant layer and the additional layer, and the key information is placed in the central position of the screen, so that the design improves the transmission reliability of the information. In particular, the redundancy layer, the existence of which ensures that even when there is a problem in the data transmission of the core layer, lost or damaged data can be repaired and supplemented by the redundancy layer, thereby greatly enhancing the reliability of the data transmission.
3. The invention adopts multi-section information parallel transmission, and the design provides an efficient information transmission mode. The information is divided into a plurality of sub-sequences and transmitted in parallel, so that the transmission speed is increased, and the demodulation can be smoothly carried out by combining the information with the template area information.
4. The invention sets a template area which contains the distribution information of pixel blocks, the demodulation rule of the pixel blocks and the splicing rule. This means that for different template settings, the smart phone can perform corresponding demodulation according to the template information transmitted by the smart phone, so that the method has higher universality in different equipment and application scenes.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
fig. 2 is a layered schematic diagram of a television screen according to the present invention.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
The invention relates to a visible light communication method between a television screen and a smart phone, which comprises the following steps as shown in figure 1:
s1: as shown in fig. 2, the television screen is divided into a template layer (a small square in the center in fig. 2), a core layer, a redundancy layer and an additional layer, wherein the template layer is positioned at the center of the television screen, the core layer is arranged around the template layer, the redundancy layer is arranged around the core layer, and the additional layer is arranged around the redundancy layer;
s2: dividing a plurality of pixel blocks on a television screen, wherein each pixel block consists of a plurality of pixels in close proximity, and determining the size of the pixel block according to the resolution of the television screen and the resolution of a camera of a smart phone so that the camera can clearly distinguish each pixel block;
wherein only one pixel block is arranged in the template layer;
a plurality of pixel blocks are distributed in the core layer, the redundant layer and the additional layer;
s3: modulating pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule of a television screen to a template layer pixel block;
modulating core information onto a core layer, wherein different pixel blocks on the core layer transmit multiple pieces of different information in parallel;
modulating redundant information onto a redundant layer, wherein the redundant information is identical to core information, and different pixel blocks on the redundant layer transmit multiple pieces of different information in parallel;
modulating the additional information onto the additional layer, wherein different pixel blocks on the additional layer transmit multiple pieces of different information in parallel;
s4: the intelligent mobile phone receives television screen information by using a camera, decodes the information on the received template layer pixel blocks, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a core layer to obtain core information according to pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule obtained by decoding, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a redundant layer to obtain redundant information, and demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on an additional layer to obtain additional information;
s5: the smart phone compares the decoded core information with the redundant information, and when the core information is damaged or incomplete, the core information is supplemented or repaired by the redundant information;
s6: and the intelligent mobile phone combines the redundant information with the supplemented or repaired core information to form final information according to the pixel block information splicing rule and displays the final information on a screen of the intelligent mobile phone.
In some embodiments, during modulation, information to be transmitted in the core layer or the redundant layer or the additional layer is encoded to obtain a continuous digital signal sequence, and the sequence is divided into a plurality of sub-sequences, wherein each sub-sequence corresponds to a pixel block for transmission.
In some embodiments, the modulation process further comprises:
modulating each sub-sequence using PWM or OOK such that each digital bit is converted to a particular brightness or color;
and (3) using an OFDM technology to allocate the sub-sequences modulated by PWM or OOK to different frequency sub-carriers, and mapping the different frequency sub-carriers to different pixel blocks for transmission.
Wherein:
PWM (Pulse Width Modulation) is pulse width modulation, a technique that converts between analog and digital signals.
OOK (On-Off Keying) is On-Off Keying or On-Off modulation.
OFDM (Orthogonal Frequency Division Multiplexing) is orthogonal frequency division multiplexing, a digital modulation technique that separates a single data stream into multiple smaller data streams, each modulated on its own independent subcarriers. All these sub-carriers are orthogonal, meaning that they do not interfere with each other. OFDM can effectively resist multipath fading and is widely used for wireless communication such as Wi-Fi and LTE.
In some embodiments, forward error correction coding is applied for each pixel block in the core layer, improving the reliability of information transmission.
In some embodiments, the forward error correction coding is Reed-Solomon coding or LDPC coding
In some embodiments, among others, the information conveyed by the television screen includes, but is not limited to, text, image, sound, and video information.
In some embodiments, the smart phone stores the information transferred in the core layer, the redundant layer and the additional layer to the memory or the hard disk, demodulates the information in the template layer, and then retrieves the information transferred in the core layer, the redundant layer and the additional layer for demodulation after the demodulation of the information in the template layer is completed.
In some embodiments, the method further comprises: before demodulation, the smart phone also needs to input a password.
Because the invention directly transmits information in a local area, the internet is not needed, a cloud platform is not needed to be set up, and the information is not directly displayed on a screen, the invention can be applied to the scene comprising:
1) In certain emergency situations, such as earthquakes, typhoons or other disasters, when the traditional communication infrastructure is affected and fails to work properly, the television station can send emergency messages or instructions through its screen, and the smart phone user can quickly receive these messages by simply aiming the phone at the screen.
2) Merchants may play advertisements with promotional information on television screens in shops, subway stations, or other public places. The customer can receive these preferential information directly by using the mobile phone without scanning the two-dimensional code or downloading any application.
3) In academic seminars or lectures, researchers may need to share their latest research results. To prevent unauthorized persons from viewing or stealing these studies in advance, information may be transmitted through a large screen, but participants need to enter passwords given by the researchers before receiving and viewing.
4) In a bank or other financial institution, the customer may need to confirm a large transfer or a particular financial operation. To ensure the security of these operations, the financial institution may display the confirmation information on its large screen, which the customer needs to enter his corresponding password on his cell phone before viewing and confirming, to avoid other customers from seeing his information.
Therefore, the invention has wider application prospect.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications to the technical solution and the inventive concept thereof.
Claims (8)
1. The visible light communication method between the television screen and the smart phone is characterized by comprising the following steps of:
s1: dividing the television screen into a template layer, a core layer, a redundant layer and an additional layer, wherein the template layer is positioned at the central part of the television screen, the core layer is arranged around the template layer, the redundant layer is arranged around the core layer, and the additional layer is arranged around the redundant layer;
s2: dividing a plurality of pixel blocks on a television screen, wherein each pixel block consists of a plurality of pixels in close proximity, and determining the size of the pixel block according to the resolution of the television screen and the resolution of a camera of a smart phone so that the camera can clearly distinguish each pixel block;
wherein only one pixel block is arranged in the template layer;
a plurality of pixel blocks are distributed in the core layer, the redundant layer and the additional layer;
s3: modulating pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule of a television screen to a template layer pixel block;
modulating core information onto a core layer, wherein different pixel blocks on the core layer transmit multiple pieces of different information in parallel;
modulating redundant information onto a redundant layer, wherein the redundant information is identical to core information, and different pixel blocks on the redundant layer transmit multiple pieces of different information in parallel;
modulating the additional information onto the additional layer, wherein different pixel blocks on the additional layer transmit multiple pieces of different information in parallel;
s4: the intelligent mobile phone receives television screen information by using a camera, decodes the information on the received template layer pixel blocks, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a core layer to obtain core information according to pixel block distribution information, pixel block demodulation rule information and pixel block information splicing rule obtained by decoding, demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on a redundant layer to obtain redundant information, and demodulates and splices multiple pieces of different information transmitted in parallel by different pixel blocks on the additional layer to obtain additional information;
s5: the smart phone compares the decoded core information with the redundant information, and when the core information is damaged or incomplete, the core information is supplemented or repaired by the redundant information;
s6: and the intelligent mobile phone combines the redundant information with the supplemented or repaired core information to form final information according to the pixel block information splicing rule and displays the final information on a screen of the intelligent mobile phone.
2. The method of claim 1, wherein during the modulation, the information to be transmitted in the core layer, the redundant layer, or the additional layer is encoded to obtain a continuous digital signal sequence, and the sequence is divided into a plurality of sub-sequences, wherein each sub-sequence is transmitted corresponding to a block of pixels.
3. The method of visible light communication between a television screen and a smart phone of claim 2, wherein the modulation process further comprises:
modulating each sub-sequence using PWM or OOK such that each digital bit is converted to a particular brightness or color;
and (3) using an OFDM technology to allocate the sub-sequences modulated by PWM or OOK to different frequency sub-carriers, and mapping the different frequency sub-carriers to different pixel blocks for transmission.
4. The method of claim 1, wherein for each pixel block in the core layer, a forward error correction coding is applied to improve the reliability of information transmission.
5. The method of claim 4, wherein the forward error correction code is Reed-Solomon code or LDPC code.
6. The method of claim 1, wherein the information conveyed by the television screen includes, but is not limited to, text, image, sound, and video information.
7. The method according to claim 1, wherein the smart phone stores information transferred in the core layer, the redundant layer and the additional layer into the memory or the hard disk, demodulates the information in the template layer, and then retrieves the information transferred in the core layer, the redundant layer and the additional layer for demodulation after the demodulation of the information in the template layer is completed.
8. The method of visible light communication between a television screen and a smart phone of claim 1, further comprising: before demodulation, the smart phone also needs to input a password.
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| CN117240361A (en) * | 2023-11-13 | 2023-12-15 | 新唐信通(北京)科技有限公司 | Visible light communication method between directional encryption television screen and smart phone |
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