# Patent

## Title
Method and apparatus for providing additional information of video using visible light communication

## Abstract

A method and apparatus for providing additional information included in a video displayed on a display device using visible light communication (VLC). A data packet including video data and additional information for an object included in the video data is received. The video data is extracted from the data packet, and the video data is decoded. The additional information from the data packet is extracted, and the additional information decoded. The decoded video data is output through the display device, and at the same time, the additional information is transmitted for a particular object included in a video based on a VLC protocol using a light emitting device prepared in the display device. The additional information providing apparatus includes an image sensor module, a display module, a visible light receiving module, an additional information manager and a controller.

## Background
CLAIM OF PRIORITY
This application claims the benefit under 35 U.S.C. §119(a) of a Korean Patent Application filed in the Korean Intellectual Property Office on Jan. 7, 2008 and assigned Serial No. 10-2008-1757, the disclosure of which is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a method and apparatus for playing back a video. More particularly, the present invention relates to a video playback method and apparatus capable of providing additional information included in a video to a plurality of users individually.
2. Description of the Related Art
Digital Multimedia Broadcasting (DMB) is one of the services that provide video data over portable terminals. DMB, which may provide stream-type broadcast signals, can also broadcast DMB signals, to which MPEG-4 Binary Format for Scenes (BIFS) is applied, at the DMB broadcasting station. The term ‘MPEG-4 BIFS’, as used herein, refers to an MPEG-4 scene description. DMB provides MPEG-4 BIFS as auxiliary data (or additional information) in addition to an audio/video stream, and BIFS composes a scene in units of objects and supports a particular one of BIFS nodes, which responds to a user's input so that the user can click menus and buttons while viewing contents, thereby enabling interactive communication.
Generally, MPEG-4 refers to a digital bit stream protocol for encoding audio data, video data and objects, and means a standard capable of digitally describing and delivering various multimedia contents. Since MPEG-4 is an object-based description system, there is a need for scene description information for making or composing each scene.
Such scene description information is referred to as Binary Format for Scenes (BIFS). Herein, BIFS refers to an MPEG-4 scene description protocol, and it means information used for making MPEG-4 objects, describing an interface with the MPEG-4 objects, moving the MPEG-4 objects, and composing/mixing the MPEG-4 objects to allow them to interact with each other. Therefore, a DMB receiver, which receives the MPEG-4 BIFS-based DMB data, can receive objects constituting DMB contents, compose a scene using them according to BIFS, and provide the scene to the user.
Accordingly, MPEG-4 BIFS-based DMB service can be provided to a personal portable terminal so that the user can click menus and buttons while viewing the contents.
However, there is a problem in that when the MPEG-4 BIFS-based DMB service is provided to a large-sized display device such as a large-sized electric bulletin board aimed at providing information to a plurality of users, there is difficulty in realizing the environment where the plurality of users can select their own desired objects individually through the large-sized display device. Further, there also is difficulty in implementing the environment that individually provides particular data the plurality of users want.
SUMMARY OF THE INVENTION
An aspect of the present invention is to provide a method and apparatus for providing a video to a plurality of users, and individually providing additional information an individual wants, using a display device supporting visible light communication.
According to one exemplary aspect of the present invention, there is provided a method for providing additional information included in a video displayed on a display device using visible light communication (VLC). The method includes (a) receiving a data packet including video data and additional information for an object included in the video data; (b) extracting the video data from the data packet, and decoding the video data; (c) extracting the additional information from the data packet, and decoding the additional information; and (d) outputting the decoded video data through the display device, and at the same time, transmitting additional information for a particular object included in a video based on a VLC protocol using a light emitting device prepared in the display device.
Preferably, in the present invention the light emitting device can be a light emitting device prepared in a region where a particular object included in a video is placed, and the additional information is additional information associated with the particular object.
Preferably, in the present invention the data packet further may include audio data, and the method further includes extracting the audio data from the data packet and decoding the audio data.
Preferably, in the present invention the method further includes (e) receiving a visible light signal emitted from a light emitting device in a region where the particular object is situated; (f) displaying an optical signal in a wavelength band, emitted by a light emitting device prepared in a region where the object is located, using a display of a reception apparatus; and (g) extracting the additional information transmitted from the light emitting device in the region where the particular object is placed, and providing the extracted additional information.
Preferably, the step (g) may further include storing the extracted additional information in a memory.
Preferably, the step (g) may include generating a list of a plurality of the extracted additional information; displaying the additional information list; receiving selected additional information included in the additional information list; and displaying detailed information included in the selected additional information.
Preferably, the step (c) may further include requesting and acquiring the additional information selectively.
According to another exemplary aspect of the present invention, there is provided a method for providing additional information included in a video by a mobile terminal supporting visible light communication (VLC). The method includes (a) displaying video data, and at the same time, receiving a visible light signal emitted from a display device that transmits additional information for a particular object included in a video based on a VLC protocol; (b) displaying an optical signal in a wavelength band, emitted by a light emitting device prepared in a region where the object is placed, using a display of the mobile terminal; and (c) extracting the additional information transmitted from the light emitting device in the region where the particular object is located, and providing the extracted additional information.
Preferably, the step (c) may further include storing the extracted additional information in a memory.
Preferably, the step (c) may include generating a list of a plurality of the extracted additional information; displaying the additional information list; receiving selected additional information included in the additional information list; and displaying detailed information included in the selected additional information.
According to another exemplary aspect of the present invention, there is provided an apparatus for transmitting additional information included in a video using visible light communication (VLC). The apparatus includes a demultiplexer for separating video data and data including additional information associated with a particular object included in the video data, from a data packet received from an exterior; a video decoder for restoring a video by decoding the video data; a display device for displaying the restored video through a plurality of light emitting devices; a data decoder for restoring the data including the additional information; and a visible light communication device for transmitting the additional information associated with the particular object using a light emitting device prepared in the display device based on a VLC protocol.
Preferably, the visible light communication device will transmit the additional information associated with the particular object using a light emitting device prepared in a region where a particular object included in a video.
Preferably, the apparatus further includes an audio decoder for restoring an audio signal by decoding audio data; and a speaker for outputting the restored audio signal.
According to yet another exemplary aspect of the present invention, there is provided an apparatus for receiving additional information included in a video from a display device for displaying the video using a plurality of light emitting devices, and providing the received additional information. The apparatus includes an image sensor for receiving a visible light signal emitted from a light emitting device prepared in the display device, and converting the received visible light signal into an electric signal; a visible light receiving module for acquiring data from a signal output from the image sensor based on a visible light communication (VLC) protocol; an additional information manager for extracting additional information associated with a particular object of the video data from the data acquired by the visible light receiving module; and a display module for displaying a color-difference signal in a wavelength band corresponding to a visible light signal received from the image sensor and information provided from the additional information manager.
Preferably, in the present invention the apparatus further includes a memory for storing the extracted additional information.
Preferably, in the present invention the additional information manager generates a list of a plurality of the extracted additional information, and displays the generated additional information list.
Preferably, in the present invention the apparatus further includes an external input interface for receiving selected additional information included in the additional information list.



BRIEF DESCRIPTION OF THE DRAWINGS
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawings will be provided by the U.S. Patent and Trademark Office upon request and payment of the necessary fee.
The above and other exemplary aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram illustrating a structure of an exemplary apparatus for transmitting additional information of a video according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating an exemplary video displayed on a display device in an additional information transmission apparatus according to an exemplary embodiment of the present invention;
FIG. 3 is a block diagram illustrating a structure of an apparatus for providing additional information of a video according to an exemplary embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for transmitting additional information of a video according to an exemplary embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for providing additional information of a video according to an exemplary embodiment of the present invention; and
FIG. 6 is a flowchart illustrating a method for transmitting additional information of a video according to another exemplary embodiment of the present invention.



DETAILED DESCRIPTION
Preferred exemplary embodiments of the present invention will now be described in detail with reference to the annexed drawings. The matters defined in the description such as a detailed construction and elements are provided to assist in a comprehensive understanding of exemplary embodiments of the invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the exemplary aspects of the present invention described herein can be made without departing from the spirit of the invention and the scope of the appended claims.
The present invention provides a method and apparatus for providing additional information associated with an object that a user has an interest in on the screen he or she is viewing, to a plurality of users by means of visible light communication. In a DMB service involving the general BIFS, the user selects an object included in a video, performs a separate interaction with the selected object, and acquires additional information depending on the information included in an MPEG Transport Stream (TS) or a location of the information indicating it. However, an apparatus that provides a video to a plurality of users, cannot perform an interaction requested by each of the plurality of users. Therefore, the present invention provides a method and apparatus for acquiring additional information previously regardless of the interaction, and providing the additional information using visible light communication.
To implement an exemplary embodiment of the present invention, an apparatus for transmitting additional information of a video includes a large-sized display device that displays a video for a plurality of users, and an apparatus for providing additional information of a video includes a portable terminal (e.g., mobile communication terminal) carried by a user who views the video through the large-sized display device.
FIG. 1 is a block diagram illustrating an exemplary structure of an apparatus for transmitting additional information of a video according to an exemplary embodiment of the present invention. Referring to FIG. 1, the additional information transmission apparatus includes a demultiplexer (DEMUX) 500, a video decoder 510, an audio decoder 520, a data decoder 530, a display device 540, a speaker 550, and a visible light communication (VLC) device 560.
The demultiplexer 500 separates from an MPEG TS received from the exterior a video data stream, an audio data stream and a data stream with additional information included in the video or audio data.
The video decoder 510 generates a video signal by decoding the video data stream according to the MPEG video coding standard, and the audio decoder 520 generates an audio signal by decoding the audio data stream according to the MPEG audio coding standard. Although the audio/video decoding is achieved herein based on the MPEG coding standard by way of example, the scope of the present invention in no way limited to the MPEG coding standard as other coding standards can be used.
The data decoder 530 decodes the data stream into data with additional information included in the audio/video data, and provides it to the visible light communication device 560. The additional information includes information on at least one object included in the video. For example, the additional information can involve an identifier indicating a video frame where an object is included, information on a location where the object is prepared in the video frame, an identifier of the object, a name of the object, and detailed information of the object.
The display device 540 displays the video signal output from the video decoder 510. The display device 540 includes, for example, a plurality of light emitting devices. Each pixel prepared in the display device 540 can include light emitting devices capable of expressing lights in a visible-light wavelength band. Preferably, the light emitting devices can include Light Emitting Diodes (LEDs) that emit a Red (R) light, a Green (G) light and a Blue (B) light. Further, the light emitting devices are mounted in the display device 540 generally composed of a TFT-LCD, as a back-light unit, and those can be LEDs which can be on/off-controlled.
The speaker 550 outputs the audio signal decoded by the audio decoder 520.
The visible light communication device 560 transmits the additional information output from the data decoder 530 based on a visible light communication (VLC) protocol. Based on an identifier indicating a video frame in which an object included, information on the location where the object is prepared in the video frame, and an identifier of the object, all of which are included in the additional information, the visible light communication device 560 transmits the additional information by the medium of the light emitting devices prepared in the region corresponding to the location of the object.
FIG. 2 is a diagram illustrating an exemplary video displayed on a display device according to an embodiment of the present invention. Referring to FIG. 2, the display device 540 displays a video frame including a person with a jacket and sunglasses, through light emitting devices included therein. According to the present invention, in the video frame, the jacket and sunglasses can be designated as objects, and the visible light communication device 560 delivers a signal VLC-modulated by a VLC protocol to the light emitting devices prepared in regions 561 and 565 where the jacket and sunglasses are placed in the video frame. Then, the light emitting devices in the regions where the jacket and sunglasses are placed will transmit additional information associated with the corresponding objects.
FIG. 3 is a block diagram illustrating an exemplary structure of an apparatus for providing additional information of a video according to an exemplary embodiment of the present invention. Referring to FIG. 3, the additional information providing apparatus includes an image sensor module 610, a display module 620, a visible light receiving module 630, an additional information manager 640 and a controller 670.
The image sensor module 610 preferably includes a plurality of image sensors for converting an optical signal in a visible-light wavelength band into an electric signal.
The display module 620 preferably converts the signal converted through the plurality of image sensors prepared in the image sensor module 610 into an optical signal in a visible-light wavelength band, and displays it thereon.
The visible light receiving module 630 preferably acquires data transmitted through visible light communication by applying to a VLC protocol the signal received through the plurality of image sensors prepared in the image sensor module 610. The data transmitted through visible light communication can include, for example, the additional information. For example, the additional information can be BIFS information defined by MPEG.
The additional information manager 640 receives the additional information acquired by the visible light receiving module 630, and generates a list of the additional information.
The additional information providing apparatus can further include, for example, a memory 650 for storing information related to overall functions of the additional information providing apparatus. The additional information manager 640 stores in the memory 650 the list of additional information and the additional information provided from the visible light receiving module 630. The additional information manager 640 provides the list of additional information to the display module 620.
Preferably, the additional information providing apparatus can further include an external input device 660, which is provided as a device for interfacing with the user. The external input device 660 preferably comprises a device for outputting keys prepared in an external portion of the additional information providing apparatus, and outputting unique key input data in response to entry of the keys. A person of ordinary skill in the art can understand and appreciate that the external input device could also comprises a touchscreen without physical keys, and may include a module for audible input, for example, using voice commands.
The controller 670 preferably controls the overall operation of the devices prepared in the additional information providing apparatus. In particular, the controller 670 checks a type of the key input data from the external input device 660, and then performs an operation corresponding to the check result. For example, when a list of the additional information provided by the additional information manager 640 is displayed through the display module 620, the user can select any additional information from the additional information list by means of the external input device 660. At this point, the controller 670 checks a type of the key input data from the external input device 660, extracts additional information stored in the memory 650 according to the check result, and displays it through the display module 620.
The additional information providing apparatus can be provided to a common mobile communication terminal supporting audio/video communication, and the mobile communication terminal can be implemented such that it can perform an operation of the additional information providing apparatus while performing a normal mobile communication service-related operation.
With reference to the foregoing components and the exemplary flowchart shown in FIG. 4, an exemplary description will now be made of a process of transmitting additional information of a video in an additional information transmission apparatus according to an exemplary embodiment of the present invention.
In step 710, the additional information transmission apparatus receives an MPEG TS from the exterior.
In step 720, the demultiplexer 500 separates (demultiplexes) the received MPEG TS into a video data stream, an audio data stream and a data stream according to a predetermined format.
Next, in step 730, the additional information transmission apparatus restores the video data stream, the audio data stream and the data stream independently. To be specific, the video decoder 510 restores the compressed video data stream in the MPEG TS into its original video signal, and the audio decoder 520 restores the compressed audio data stream in the MPEG TS into its original audio signal. Further, the data decoder 530 restores the compressed data stream in the MPEG TS into its original data with additional information.
In step 740, the additional information transmission apparatus acquires additional information that it will transmit through a display device. Specifically, the data with the additional information, restored by the data decoder 530, is delivered to the visible light communication device 560. The visible light communication device 560 converts the data with the additional information into a transmission packet based on the VLC protocol.
Preferably, the additional information can include an identifier indicating a video frame where an object is included, information on a location where the object is prepared in the video frame, and an identifier of the object.
The additional information can be, for example, such information as a Uniform Resource Locator (URL) indicating a location where information on the object is stored. In this case, step 740 further includes a process of requesting and acquiring information on the object from the location where the information on the object is stored, i.e., acquiring the information including an identifier indicating a video frame where the object is included, information on a location where the object is prepared in the video frame, and an identifier of the object.
In step 750, out of the restored signals, the video signal is delivered to the display device 540 while the audio signal is delivered to the speaker 550.
Next, in step 760, the visible light communication device 560 transmits the converted transmission packet through light emitting devices prepared in the display device 540 taking into account a location of the object, included in the additional information. For example, when the display device 540 displays the video of FIG. 2, the visible light communication device 560 receives additional information for each of the jacket and sunglasses designated as objects, and generates transmission packets for their associated additional information, respectively. The visible light communication device 560 checks from the additional information a region 561 where the jacket designated as an object is placed in the video, and then transmits a transmission packet through light emitting devices prepared in the region 561. Similarly, the visible light communication device 560 checks a region 565 where the sunglasses designated as an object is situated in the video, and transmits a transmission packet through light emitting devices prepared in the region 565.
With reference to the foregoing components and FIG. 5, a description will now be made of a process of providing additional information of a video in an additional information providing apparatus according to an exemplary embodiment of the present invention.
When the user turns the image sensor module 610 prepared in the additional information providing apparatus toward the display device 540 prepared in the additional information transmission apparatus, the image sensor module 610 receives an optical signal generated from the display device 540 in the transmission apparatus, and converts the received optical signal into an electric signal in step 910.
Next, the display module 620 acquires a color-difference signal from a signal converted through a plurality of image sensors prepared in the image sensor module 610 in step 920, and outputs the acquired color-difference signal according to a size of its screen in step 930.
In step 940, the visible light receiving module 630 checks the data transmitted through visible light communication by applying to the VLC protocol the signal received through the plurality of image sensors in the image sensor module 610, and acquires the additional information that the additional information transmission apparatus transmits.
In step 950, the visible light receiving module 630 outputs the additional information through the display module 620.
It is also preferable that the additional information providing method further includes a process of selectively providing additional information to the user using a list of the additional information.
With reference to FIG. 6, a description will now be made of a process of selectively providing additional information to a user using a list of additional information in an additional information providing method according to an exemplary embodiment of the present invention.
In step 941, the additional information manager 640 receives a plurality of the additional information, generates a list of the additional information, and provides the list of the additional information to the display module 620.
In step 942, the display module 620 displays the list of the additional information.
In step 943, the controller 670 receives information indicating selected additional information in the list of the additional information, by means of the external input device 660 provided for interfacing with the user.
Next, in step 944, the additional information manager 640 extracts the selected additional information from the plurality of additional information stored in the memory 650, and provides it to the display module 620.
As is apparent from the exemplary foregoing description, with use of the additional information transmission apparatus and the additional information providing apparatus, the present invention can provide, through visible light communication, additional information associated with an object that the user has an interest in on the scene he or she is viewing, using BIFS information proposed by MPEG. In addition, the present invention can effectively provide the additional information desired by individual users using the display device that provides videos to a plurality of users, like an electric bulletin board.
While the invention has been shown and described with reference to certain preferred exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

## Claims

1. A method for providing additional information included in a video displayed on a display device having a plurality of light emitting diodes (LEDs) using a visible light communication (VLC) protocol, the method comprising:
receiving a data packet including video data of the video and additional information associated with a particular object;
extracting the video data from the data packet, and decoding the video data;
extracting the additional information from the data packet, and decoding the additional information; and
generating visible light signals from the plurality of LEDs to output the video displaying the video data and the extracted additional information to at least one further device based on the VLC protocol, wherein first LEDs of the plurality of LEDs are provided within a first region of the display device corresponding to a location of a first object in the video, and
the first LEDs transmitting a first data packet of the VLC protocol, the first data packet representing the extracted additional information associated with the first object.

2. The method of claim 1, wherein the additional information comprises an identifier indicating a video frame where an object is included, information on a location where the object is provided within the video frame, and an identifier of the object, a name of the object, and detailed information of the object.

3. The method of claim 1, wherein the additional information is decoded and transmitted in response to receiving an input request via an input device.

4. The method of claim 1, further comprising: extracting audio data for the data packet and decoding the audio data.

5. The method of claim 1, further comprising:
receiving, by the further device, the first or second data packet; and
extracting, by the further device, the additional information from the first or second data packet, and displaying the extracted additional information on a display of the further device.

6. The method of claim 5, further comprising storing the extracted additional information at the further device in a memory.

7. The method of claim 5, wherein extracting the additional information by the further device comprises:
generating a list of a plurality of the extracted additional information;
displaying the additional information list;
receiving selected additional information included in the additional information list; and
displaying detailed information included in the selected additional information.

8. The method of claim 1, wherein the extracting of the additional information transmitted from the display device further comprises:
requesting and acquiring the additional information selectively.

9. The method of claim 1, wherein the second LEDs of the plurality of LEDs are provided within a second region of the display device corresponding to a location of a second object in the video data,
and wherein the second LEDs transmitting a second data packet of the VLC protocol, the second data packet representing the extracted additional information associated with the second object.

10. The method of claim 9, wherein the additional information of the first and second objects are transmitted via the respective first and second data packets regardless of interaction between the display device and the at least one further device.

11. The method according to claim 9, wherein a visible light communication (VLC) device delivers signals VLC-modulated to the first or second LEDs.

12. A method performed at a mobile terminal, for providing additional information included in a video displayed at another device, the method comprising:
receiving a first data packets of a visible light communication (VLC) protocol transmitted from the another device, the first data packet being transmitted by first light emitting diodes-(LEDs) provided within a first display region of the another device corresponding to a location of a first object in the video, and representing additional information associated with the first object; and
extracting the additional information associated with the first object and represented in the first data packet, and outputting the extracted additional information to a display the mobile terminal.

13. The method of claim 12, further comprising storing the extracted additional information in a memory.

14. The method of claim 13, wherein the extracting of the additional information comprises:
generating a list of a plurality of the extracted additional information;
displaying the additional information list;
receiving selected additional information included in the additional information list; and
displaying detailed information included in the selected additional information.

15. The method of claim 12, further comprising:
receiving a second data packet of the VLC protocol transmitted from the another device; and
extracting the additional information associated with a second object and represented in the second data packet, and outputting the extracted additional information to a display the mobile terminal,
wherein the second data packet being transmitted by second LEDs provided within a second display region of the another device corresponding to a location of the second object in the video, and representing additional information associated with the second object.

16. An apparatus for transmitting additional information included in a video using visible light communication (VLC), the apparatus comprising:
an interface unit which receives a data packet including video data of the video and additional information associated with a particular object; and
a controller which extracts the video data from the data packet and the additional information from the data packet for decoding the video data and the additional information and generates visible light signals from the plurality of light emitting diodes (LEDs) to output the video displaying the video data and the extracted additional information to at least one further device based on the VLC protocol,
wherein first LEDs of the plurality of LEDs are provided within a first region of the display device corresponding to a location of a first object in the video, and wherein the first LEDs transmitting a first data packet of the VLC protocol, the first data packet representing the extracted additional information associated with the first object.

17. The apparatus of claim 16, further comprising:
an audio decoder for restoring an audio signal by decoding audio data; and
a speaker for outputting the restored audio signal.

18. The method of claim 16, wherein second LEDs of the plurality of LEDs are provided within a second region of the display device corresponding to a location of a second object in the video, and wherein the second LEDs transmitting a second data packet of the VLC protocol, the second data packet representing the extracted additional information associated with the second object.

19. A mobile terminal for receiving additional information included in a video from another device that displays the video using a plurality of light emitting devices, mobile terminal comprising:
a transceiver which receives a first data packet a visible light communication (VLC) protocol transmitted from the another device, the first data packet being transmitted by first light emitting diodes (LEDs) provided within a first display region of the another device corresponding to a location of a first object in the video, and representing additional information associated with the first object; and
a controller which extracts the additional information associated with the first object and represented in the first data packet, and outputs the extracted additional information to a display of the mobile terminal.

20. The mobile terminal of claim 19, further comprising:
a memory for storing the extracted additional information.

21. The mobile terminal of claim 19, wherein the additional information manager generates a list of a plurality of the extracted additional information, and displays the generated additional information list.

22. The mobile terminal of claim 19, comprising:
an external input interface for receiving selected additional information from the plurality of the extracted additional information included in the additional information list.

23. The method of claim 19, wherein the transceiver which receives a second data packet of the VLC protocol transmitted from the another device,
wherein the controller which extracts the additional information associated with a second object and represented in the second data packet, and outputs the extracted additional information to a display of the mobile terminal, and wherein the second data packet being transmitted by second LEDs provided within a second display region of the another device corresponding to a location of the second object in the video, and representing additional information associated with the second object.