KR101924256B1 - Communication Method and System using the LED Image - Google Patents

Communication Method and System using the LED Image Download PDF

Info

Publication number
KR101924256B1
KR101924256B1 KR1020160006872A KR20160006872A KR101924256B1 KR 101924256 B1 KR101924256 B1 KR 101924256B1 KR 1020160006872 A KR1020160006872 A KR 1020160006872A KR 20160006872 A KR20160006872 A KR 20160006872A KR 101924256 B1 KR101924256 B1 KR 101924256B1
Authority
KR
South Korea
Prior art keywords
data
color components
light source
light sources
traffic information
Prior art date
Application number
KR1020160006872A
Other languages
Korean (ko)
Other versions
KR20170087185A (en
Inventor
윤상훈
임기택
신대교
정한균
장수현
진성근
Original Assignee
전자부품연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 전자부품연구원 filed Critical 전자부품연구원
Priority to KR1020160006872A priority Critical patent/KR101924256B1/en
Publication of KR20170087185A publication Critical patent/KR20170087185A/en
Application granted granted Critical
Publication of KR101924256B1 publication Critical patent/KR101924256B1/en

Links

Images

Classifications

    • 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
    • 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
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters
    • 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

Abstract

A communication method and system using LED images are provided. A communication system according to an embodiment of the present invention transmits / receives data by modulating / demodulating data into color components according to a multi-dimensional constellation in which the color components emitted from the light source are each axis. Thereby, data can be directly transferred to the target device without passing through a person, and high-speed data transfer becomes possible.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method and system using an LED image,

The present invention relates to communication technology, and more particularly, to a method and system for performing data communication using an image.

Due to its energy efficiency and longevity, LEDs are becoming widespread and widely used, and are widely used in transportation facilities requiring continuous operation, such as traffic information display boards.

Since the traffic information transmission through the traffic information board is for the driver or the pedestrian, the vehicle control according to the traffic information, for example, 'deceleration of the vehicle due to a traffic accident occurring ahead' .

Therefore, it is necessary to transmit the information directly to the vehicle through the traffic information display board.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and system for performing communication by modulating / demodulating data in a multidimensional constellation with color axes of LEDs as respective axes .

According to an aspect of the present invention, there is provided a transmission apparatus including: a light source matrix including a plurality of light sources; And a modulator for modulating the data into color components according to the multidimensional constellation diagram in which the color components emitted from the light source are the respective axes, and outputting the modulated color components through the light source.

And, the color components include three color components, and the multi-dimensional constellation may be a three-dimensional constellation.

In addition, the plurality of light sources may be divided into a plurality of groups, and the modulator may change the output state only for a part of the plurality of groups.

Some of the light sources may output the same data.

According to another aspect of the present invention, there is provided a transmission apparatus including: a photographing unit photographing a light source matrix including a plurality of light sources; And a demodulator for demodulating the color components emitted from the light source, which are photographed through the photographing unit, into binary data using multidimensional constellation with the color components as the respective axes.

The transmitting apparatus according to another embodiment of the present invention may further include an external interface for transmitting data demodulated by the demodulator to a vehicle network.

As described above, according to the embodiments of the present invention, it is possible to perform communication by modulating / demodulating data in a multi-dimensional constellation in which the color components of the LEDs are on the respective axes, .

Particularly, according to the embodiments of the present invention, it is possible to transmit high-speed data by multi-dimensional constellation diagram, and can be applied not only to a traffic information display board but also to receiving data from a forward vehicle.

In addition, according to embodiments of the present invention, the LEDs constituting the LED matrix can be divided into a plurality of groups, and the display can be changed only for a part of the LEDs, so that data loss due to a synchronization mismatch between the transmitter and the receiver does not occur.

1 is a block diagram of a transmitting apparatus in a traffic information communication system according to an embodiment of the present invention;
2 is a block diagram of a receiving apparatus in a traffic information communication system according to an embodiment of the present invention,
Fig. 3 shows the concept of color generation by the combination of R-component, G-component and B-component,
4 is a diagram illustrating a three-dimensional constellation diagram used for data modulation,
Fig. 5 is a diagram provided for explaining a group-by-group change display method of the LED matrix.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating a traffic information communication system according to an embodiment of the present invention. As shown in FIG. 1, the traffic information communication system according to the embodiment of the present invention is performed in such a manner that the transmitting apparatus 100 transmits data to the receiving apparatus 200 through an LED image.

The transmitting apparatus 100 is a device for modulating traffic information data into LED images and transmitting the traffic information, such as a traffic information display board installed on a road, a tail lamp of a front vehicle, and a display device of a front vehicle.

1, the transmitting apparatus 100 that performs such a function includes a data generating unit 110, a modulating unit 120, and an LED matrix 130, as shown in FIG.

The data generation unit 110 generates traffic information data and applies the generated traffic information data to the modulation unit 120.

The data generation unit 110 may receive and generate traffic information data from outside. This is the case of a traffic information display board that receives traffic information data from the central control system.

Also, the data generation unit 110 may generate traffic information data from the vehicle state. This is the case for a forward vehicle that analyzes the speed and steering data through the vehicle network to generate traffic information data (sudden braking, collision, etc.)

The LED matrix 130 is a display device in which a plurality of LEDs are arranged in a matrix form.

The LED produces many colors close to natural color through a combination of R-component, G-component and B-component as shown in Fig. The modulator 120 QAM-modulates the traffic information data into color components using a three-dimensional constellation diagram in which the color components to be emitted from the LEDs are the respective axes. A three-dimensional constellation diagram used for data modulation is illustrated in Fig.

As a result, a multi-bit can be displayed / transmitted by one LED. Since a plurality of LEDs are included in the LED matrix 130, the data rate increases in proportion to the number of LEDs constituting the LED matrix 130.

The receiving apparatus 200 is an apparatus for capturing an LED image generated by the transmitting apparatus 100 and demodulating the photographed image to recover traffic information data. The receiving apparatus 200 may be implemented as a smartphone of a pedestrian or a black box of a driver.

2, the receiving apparatus 200 includes a camera 210, an image processing unit 220, a demodulator 230 output unit 240, and an external interface 250 do.

The camera 210 photographs the displayed LED matrix image through the LED matrix 130 of the transmitting apparatus 100. The image processing unit 220 divides the LED matrix image photographed by the camera 210 into LED units.

The demodulation unit 230 demodulates the LED unit image divided by the image processing unit 220 into traffic information data using the three-dimensional constellation diagram illustrated in FIG.

The output unit 240 outputs the traffic information data demodulated by the demodulation unit 230, either visually or audibly. For example, it displays traffic information or guides traffic information.

The external interface 250 transmits the traffic information data demodulated by the demodulation unit 230 to the vehicle network. So that vehicle control based on traffic information data can be performed on the vehicle side.

Up to now, preferred embodiments of the traffic information communication system have been described in detail.

In the proposed communication system, it can be seen that data is transmitted in units of image frames by the LED matrix 130. However, if frame display in the LED matrix 130 of the transmitting apparatus 100 and photographing in the camera 210 of the receiving apparatus 200 are not synchronized, accurate data transmission is difficult. Particularly, when the flashing speed of the LED is faster than the shutter speed of the camera 210, the data can not be transmitted.

5, the L × M LEDs constituting the LED matrix 130 are divided into a plurality of groups, and the data is transmitted while changing the output state of only a part of the plurality of groups It is possible.

For example, 1) data is transferred by changing only the display state of LEDs of group-1 while maintaining the display state of group-2 and group-3, 2) maintaining the display state of group-3 and group-1 3) Transmits data by changing only the display state of LEDs of Group-3 while maintaining the display state of Group-1 and Group-2; It is possible to repeat from '1)' again.

As another example, it is possible to transmit data by changing only the display states of the LEDs of group-2 and group-3 while maintaining the display state of group-1, and 2) -1, and 3) data is transferred by changing only the display states of the LEDs of group-1 and group-2 while maintaining the display state of group-3. It is also possible to repeat from '1)'.

On the other hand, in the above embodiment, the three-dimensional constellation diagram is an example only in which the R-component, the G-component, and the B-component are set to the respective axes. It is possible to implement a three-dimensional constellation with different axes according to different color schemes, such as Y-component, Cb-component and Cr-component.

Also, it is needless to say that the technical idea of the present invention can be applied to the case where the LED is a light source and the light source is replaced with another kind of light source.

Furthermore, it is possible to display the same data over multiple LEDs in a redundant manner in order to enable trouble-free communication even when a failure occurs in the LED. Furthermore, it is also possible to limit the data to be displayed redundantly to only the important data.

The receiving apparatus 200 shown in the embodiment of the present invention can be implemented by installing only an application in an existing smart phone or a black box. Likewise, the transmitting apparatus 100 can use existing facilities as it is.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

100: transmitting apparatus 110: data generating unit
120: Modulation section 130: LED matrix
200: receiving apparatus 210: camera
220: image processor 230: demodulator
240: output unit 250: external interface

Claims (6)

A light source matrix comprising a plurality of light sources; And
And a modulator for modulating the data into color components according to a multidimensional constellation in which the color components emitted from the light source are defined as respective axes and outputting the modulated color components through the light source,
Some of the plurality of light sources include,
The same data is displayed in duplicate,
Data to be displayed in duplicate is,
It is important data,
Wherein the light source matrix comprises:
And is divided into a plurality of groups composed of a plurality of light sources,
Wherein the modulator comprises:
Wherein the display state is maintained only for one group of the plurality of groups and the display status is changed for the remaining groups.
The method according to claim 1,
The color components include three color components,
Wherein the multidimensional constellation is a three-dimensional constellation.
delete delete A photographing unit photographing a light source matrix including a plurality of light sources; And
And a demodulator for demodulating the color components emitted from the light source, which are photographed through the photographing unit, into binary data using a multi-dimensional constellation having the color components as respective axes,
Some of the plurality of light sources include,
The same data is displayed in duplicate,
Data to be displayed in duplicate is,
It is important data,
Wherein the light source matrix comprises:
And is divided into a plurality of groups composed of a plurality of light sources,
Wherein the display state is maintained for only one of the plurality of groups and the display status is changed for the remaining groups.
The method of claim 5,
And an external interface for transmitting data demodulated by the demodulation unit to a vehicle network.
KR1020160006872A 2016-01-20 2016-01-20 Communication Method and System using the LED Image KR101924256B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160006872A KR101924256B1 (en) 2016-01-20 2016-01-20 Communication Method and System using the LED Image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160006872A KR101924256B1 (en) 2016-01-20 2016-01-20 Communication Method and System using the LED Image

Publications (2)

Publication Number Publication Date
KR20170087185A KR20170087185A (en) 2017-07-28
KR101924256B1 true KR101924256B1 (en) 2018-11-30

Family

ID=59422444

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160006872A KR101924256B1 (en) 2016-01-20 2016-01-20 Communication Method and System using the LED Image

Country Status (1)

Country Link
KR (1) KR101924256B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102179676B1 (en) 2019-07-31 2020-11-17 주식회사 아르고스다인 Method and system for determining position of autonomous mobile

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101524980B1 (en) * 2014-07-04 2015-06-02 연세대학교 산학협력단 Transmitter, receiver for optical wireless communication and communication method using the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102044953B1 (en) * 2012-09-19 2019-11-14 현대모비스 주식회사 Apparatus and Method for Visible Light Communication
KR101586938B1 (en) * 2014-03-27 2016-01-29 국민대학교산학협력단 Color independent visual-mimo communication system and method using the color-space-based image processing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101524980B1 (en) * 2014-07-04 2015-06-02 연세대학교 산학협력단 Transmitter, receiver for optical wireless communication and communication method using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102179676B1 (en) 2019-07-31 2020-11-17 주식회사 아르고스다인 Method and system for determining position of autonomous mobile

Also Published As

Publication number Publication date
KR20170087185A (en) 2017-07-28

Similar Documents

Publication Publication Date Title
Nagura et al. Tracking an LED array transmitter for visible light communications in the driving situation
CN103905118B (en) The equipment embedded for data and method and optical communication system and its method
Nishimoto et al. High-speed transmission of overlay coding for road-to-vehicle visible light communication using LED array and high-speed camera
Nishimoto et al. Overlay coding for road-to-vehicle visible light communication using LED array and high-speed camera
KR102095668B1 (en) DSM-PSK optical wireless transmission method and apparatus
Luo et al. Undersampled-PAM with subcarrier modulation for camera communications
CN205510277U (en) Unmanned aerial vehicle panoramic picture transmission equipment
US10476593B2 (en) Visible light-based communication method and transport device
US11575445B2 (en) RoI-based optical wireless communication method and device
CN106452602A (en) Visible light communication modulation method
KR102163977B1 (en) Method and apparatus for 2D Color Code optical wireless communication
KR101924256B1 (en) Communication Method and System using the LED Image
KR20190122852A (en) Hybrid OCC and LIFI System
Ashraf et al. See-through a vehicle: Augmenting road safety information using visual perception and camera communication in vehicles
CN103780800A (en) Method and system for vehicle camera image synchronization
Masuda et al. Spatial modulation in layered space-time coding for image-sensor-based visible light communication
Ebihara et al. Spatially-modulated space-time coding in visible light communications using 2× 2 LED array
Yamazato Overview of visible light communications with emphasis on image sensor communications
Soares et al. Optical camera communications with convolutional neural network for vehicle-tovehicle links
CN107222260A (en) It is a kind of that extended code method is encoded based on the visible light communication for becoming data field length
CN203219302U (en) Marine intelligent lamplight communication system
KR101807511B1 (en) Camera communication system and method for vehicle
Varadarajan et al. Intelligent vehicular perception of non-line-of-sight environment using visible light communication with stereo cameras
Masuda et al. Spatial modulation for layered space-time coding used in image-sensor-based visible light communication
EP3382908B1 (en) Method and apparatus for processing data with multiple rates

Legal Events

Date Code Title Description
A201 Request for examination
A302 Request for accelerated examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant