METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA USING VISIBLE LIGHT COMMUNICATION

• US 20120155889A1
• Filed: 12/12/2011
• Published: 06/21/2012
• Est. Priority Date: 12/15/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, You Jin, KANG, Tae-Gyu, LIM, Sang-Kyu, KIM, Dae Ho, JANG, Il-Soon
• Granted Patent: US 9,112,606 B2
• Time in Patent Office: Days
• US Class Current: 398/193
• CPC Class Codes: H04B 10/116 Visible light communication

Abstract

A transmitting apparatus using visible light communication generates transmission data into a two-dimensional data code according to a predetermined code method between the transmitting apparatus and a receiving apparatus and transmits the two-dimensional data code through a plurality of light emitting diodes (LED) that are arranged in a two-dimensional form. Therefore, the receiving apparatus senses light from a plurality of LEDs as an image using an image sensor, demodulates the image into a two-dimensional data code, decodes the two-dimensional data code using a code book, and restores data.

Claims

1. A transmitting apparatus of data using visible light communication, the transmitting apparatus comprising:

a code generator that converts transmission data to a two-dimensional data code according to a predetermined code method between the transmitting apparatus and a receiving apparatus;

a modulation unit that generates a modulation signal by modulating the two-dimensional data code;

a plurality of light emitting diodes (LED) that are arranged in a two-dimensional form and that emit light when turned on; and

a light source driver that controls the turn-on of the plurality of LEDs according to the modulation signal.

2. The transmitting apparatus of claim 1, further comprising a flicker and color compensation unit that compensates a color of the two-dimensional data code using dimming data and color data of lighting control information that is input from the outside.

3. The transmitting apparatus of claim 1, further comprising a flicker and color compensation unit that removes a flicker from the two-dimensional data code by generating a flicker removal code using dimming data and color data of lighting control information that is input from the outside.

4. The transmitting apparatus of claim 3, wherein light quantity energy of the two-dimensional data code is distributed to the periphery by the flicker removal code.

5. The transmitting apparatus of claim 1, further comprising a controller that performs a motion control when a size of the transmission data is larger than a size of maximum data to be transmit by the plurality of LEDs,

wherein the code generator divides the transmission data into a predetermined size according to the motion control, generates each data into a two-dimensional data code, and sequentially outputs each two-dimensional data code to the modulation unit.

6. The transmitting apparatus of claim 4, wherein the each two-dimensional data code has different color and pattern.

7. A receiving apparatus of transmitted data using visible light communication, the receiving apparatus comprising:

an image sensor that receives transmission data that are converted to a two-dimensional data through light of a plurality of LEDs that are arranged in a two-dimensional form and that senses the light as an image;

a demodulation unit that demodulates the image into the two-dimensional data code; and

a decoding unit that restores data by decoding the two-dimensional data code.

8. The receiving apparatus of claim 7, wherein the decoding unit decodes the two-dimensional data code using a code book including code decoding information.

9. The receiving apparatus of claim 7, further comprising a code removal unit that removes a code for removing a flicker from the two-dimensional data code and that outputs the two-dimensional data code to the decoding unit.

10. The receiving apparatus of claim 7, further comprising a code removal unit that removes a code for compensating a color from the two-dimensional data code and that outputs the two-dimensional data code to the decoding unit.

11. The receiving apparatus of claim 7, further comprising an image processor that processes the image and that stores the image in a frame memory.

12. The receiving apparatus of claim 11, further comprising a controller that determines a receiving processing mode according to a user application and that controls operation of the demodulation unit or the image processor according to the receiving processing mode.

13. A method of transmitting data using visible light communication in a transmitting apparatus, the method comprising:

generating transmission data into a two-dimensional data code according to a predetermined code method between the transmitting apparatus and a receiving apparatus;

modulating the two-dimensional data code into a modulation signal; and

emitting light by controlling the turn-on of a plurality of LEDs that are arranged in a two-dimensional form according to the modulation signal.

14. The method of claim 13, further comprising removing a flicker from the two-dimensional data code and compensating a color change before the modulating of the two-dimensional data code.

15. The method of claim 14, wherein the compensating of a color change comprises

generating a flicker removal code for removing the flicker and a color compensation code for compensating the color change according to color data and dimming data of lighting control information that is input from the outside;

and

combining the flicker removal code and the color compensation code to the two-dimensional data code.

16. The method of claim 13, wherein the generating of transmission data comprises dividing, if a size of the transmission data is larger than a predetermined threshold value, the transmission data into a plurality of data having a predetermined size by performing a motion control and converting the plurality of data to a plurality of two-dimensional data codes, respectively.

17. The method of claim 16, wherein plurality of two-dimensional data codes have different colors and patterns.

18. A method of receiving transmitted data using visible light communication in a receiving apparatus, the method comprising:

receiving data that are converted to a two-dimensional data code through light of a plurality of LEDs that are arranged in a two-dimensional form;

sensing the light as an image; and

performing a direct processing of the image or restoring the data from the image according to a user application.

19. The method of claim 18, wherein the restoring of data from the image comprises

demodulating the image into a two-dimensional data code;

and

decoding the two-dimensional data code into the data.

20. The method of claim 19, wherein the decoding of the two-dimensional data code comprises decoding the two-dimensional data into the data using a code book including code decoding information.