KR20140002471A - Transport system and client system for hybrid 3d contents service - Google Patents

Transport system and client system for hybrid 3d contents service Download PDF

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Publication number
KR20140002471A
KR20140002471A KR1020130021539A KR20130021539A KR20140002471A KR 20140002471 A KR20140002471 A KR 20140002471A KR 1020130021539 A KR1020130021539 A KR 1020130021539A KR 20130021539 A KR20130021539 A KR 20130021539A KR 20140002471 A KR20140002471 A KR 20140002471A
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South Korea
Prior art keywords
stream
enhancement layer
hybrid
base layer
network
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KR1020130021539A
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Korean (ko)
Inventor
김태정
김재호
김창기
유정주
홍진우
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한국전자통신연구원
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Priority to US13/922,538 priority Critical patent/US20140002598A1/en
Publication of KR20140002471A publication Critical patent/KR20140002471A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/194—Transmission of image signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/44—Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234327—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into layers, e.g. base layer and one or more enhancement layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2368—Multiplexing of audio and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/615—Signal processing at physical level

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

Disclosed is a transmission system for a hybrid 3D content service. The transmission system transmits a base layer (BL) stream of a scalable bitstream encoded by the SVC encoder and an SVC encoder encoding 3D content of left and right images to a client system through a broadcasting network. And a hybrid network transport streaming module for transmitting an enhancement layer (EL) stream to a client system through an internet network.

Figure P1020130021539

Description

Transport system and client system for hybrid 3D contents service

The present invention relates to a 3D content service providing technology, and more particularly, to a technology for providing a hybrid 3D content service using a broadcasting network and an internet network.

As major TV makers such as Samsung and LG are expanding their distribution to 3D TVs, domestic and overseas broadcasting companies are already providing or planning to provide 3DTV broadcasting. BSkyB in the UK is investing most actively in 3D services, starting with 3DTV test broadcasts in 2008. In France, the TF-1 relayed the 2010 South Africa FIFA World Cup in 3D video via IPTV and satellite. Germany, like France, provided 3DTV broadcasts for sports such as soccer and ice hockey. In the US, 3DTV pilot service was provided centering on cable TV. Among satellite channels, DIREC TV has been providing 3D VOD service since June 2010. In Japan, BS11 broadcasts documentaries, sports, dramas, animations, and about an hour a day.In Korea, terrestrial channels KBS, cable channels CJ HelloVision, HCN, Gangnam, C & M, Tbroad, Btv, Cook TV is providing 3D VOD service.

In order to provide such a 3D service, in the current broadcast network, a service compatible 3D service method is adopted and used to guarantee backward compatibility with an existing DTV (Digital TV) broadcasting system. Is shown. As shown, the transmission system 10 encodes an image using two codecs. The left image is encoded by MPEG-2 and the right image is encoded by H.264 / AVC. To send. Accordingly, existing DTV viewers watch DTV only with MPEG-2 encoded left eye images, and viewers with 3DTV receivers decode two streams to watch 3D stereoscopic images.

However, according to the system structure as shown in FIG. 1, the image quality difference due to the coding loss between the left image and the right image occurs, which may cause inconvenience to the user who views 3D. In addition, the combination of MPEG-2 and H.264 requires a wide bandwidth by encoding and transmitting Full HD video. In addition, in the 3D service using the broadcasting network and the Internet, since each of the schemes of FIG. 1 is independently encoded and transmitted through the Internet, the images can be leaked and reproduced without any restriction, and thus, content protection measures are required separately for content protection. .

An object of the present invention is to provide a transmission system and a client system for a hybrid 3D content service that can reduce the image quality difference between two images.

In addition, an object of the present invention is to provide a transmission system and a client system for a hybrid 3D content service that can protect content without a separate content protection algorithm.

In accordance with an aspect of the present invention, a transmission system for a hybrid 3D content service includes an SVC encoder for encoding 3D content of a left image and a right image, and a scalable bitstream encoded by the SVC encoder. And a hybrid network transmission streaming module for transmitting a base layer (BL) stream to a client system through a broadcasting network and transmitting an enhancement layer (EL) stream to a client system through an internet network.

The hybrid network transport streaming module transmits the enhancement layer stream at the request of a client system.

The SVC encoder includes information on the number of video images to be output by the decoder of the client system in the Supplemental Enhancement Information (SEI) according to the type of content.

The hybrid network transport streaming module includes a layer separator that separates the scalable bitstream encoded by the SVC encoder into a base layer and an enhancement layer, and a base layer that converts the separated base layer stream into a transport stream (TS). And a TS multiplexer, an enhancement layer TS multiplexer for converting the separated enhancement layer streams into a transport stream, and an enhancement layer provider for segmenting and storing the enhancement layer transport stream and streaming the segment file at the corresponding time point requested by the client system.

The enhancement layer provider generates a media presentation description (MPD) file based on the segmented content of the enhancement layer transport stream, and provides the MPD file at the request of the client system.

The enhancement layer providing unit performs streaming transmission based on Hyper Text Transfer Protocol (HTTP).

On the other hand, the client system for a hybrid 3D content service according to an aspect of the present invention for achieving the above technical problem is a transport stream (TS) including a base layer stream from the transport system through a broadcast network and the Internet network A hybrid network receiving module for receiving an enhancement layer stream, requesting the transmission system for receiving the enhancement layer stream, and an adaptation for outputting 2D video or 3D video by decoding the stream received by the hybrid network receiving module. It includes an enemy SVC decoder.

The hybrid network reception module is a TS demultiplexer for a base layer that separates a transport stream received through a broadcasting network into a base layer stream and an audio stream, and requests and receives a media presentation description (MPD) file from the transport system, and uses the base layer for Streaming control engine that analyzes the time stamp of the 2D video provided from the TS demultiplexer and the segment information of the received MPD file to determine the enhancement layer segment TS file at the start of the download, the segment at the time determined by the streaming control engine from the transmission system. A single scalable bit by synchronizing the base layer stream with the enhancement layer stream, and an access client that downloads a TS file first, a TS demultiplexer for the enhancement layer that converts the downloaded enhancement layer TS file into an enhancement layer stream. Rimin includes a synchronization module for generating a SVC NAL data.

The streaming control engine requests an MPD file to the transmission system when a user requests a 3D viewing.

The adaptive SVC decoder checks the number of output images by identifying the SEIs belonging to the header of the SVC NAL (Network Adaptation Layer), which is a single scalable bitstream generated by the synchronization module, and determines the number of output images. Output video or 3D video.

According to the present invention, it is possible to encode and decode using one codec to reduce the difference in image quality between two images, which is problematic in the conventional method, and to provide Full-HD video service at a bit rate lower than that of the previous method. In addition to 2D compatible 3D services, multi-resolution 2D services and multi-resolution 3D services are possible.

In addition, according to the present invention, only the enhancement layer, which is decoded based on the information of the base layer, is transmitted through the Internet, thereby creating an effect of protecting the content without a separate content protection means.

1 is a block diagram of a hybrid 3D content service system using the conventional Internet and a broadcasting network.
2 is a block diagram of a hybrid 3D content service system based on a multilayer video encoding codec according to an embodiment of the present invention.
3 is a block diagram of a hybrid network transport streaming module shown in FIG. 2;
4 is a block diagram of the hybrid network receiving module shown in FIG. 2;
5 shows a standard SVC decoding scheme.
6 illustrates an SVC decoding scheme according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and further aspects of the present invention will become more apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a hybrid 3D content service system based on a multilayer video encoding codec according to an embodiment of the present invention.

The hybrid 3D content service system based on the multilayer video encoding codec includes a transmission system 100 and a client system 200. The transmission system 100 has a function of generating a hierarchical structure for compressing content based on SVC (Scalable Video Coding) and transmitting it to a broadcasting network and an internet network. The transmission system 100 includes an SVC encoder 110 and a hybrid network transmission streaming module 120. The SVC encoder 110 receives and encodes 3D content of a left image and a right image. The SVC encoder 110 provides information indicating the number of outputs in a Supplemental Enhancement Information (SEI) header according to the type of content. The message provided by the SEI header means the number of video images to be output by the decoder. An example of Identity Value that specifies the number of outputs is shown in Table 1 below.

Output Identify Value (OID) Description 00 A Single Output 01 Two output (BL out, EL out) 10 Two output (BL + EL0 out, EL1 out) 11 Reserved

As shown in Table 1, the output identification value (OID) may be a binary value having a 2-bit length. If the OID is “00”, it has one output, which means providing 2D video. In addition, "01" or "10" indicates two outputs of the decoder, which means providing 3D video. The above OID value can be allocated by increasing the representable bit if necessary. This may be arbitrarily set by the provider storing and transmitting the content.

The hybrid network transmission streaming module 120 transmits a stream of a base layer (BL) of the scalable bitstream encoded by the SVC encoder 110 through a broadcasting network. In addition, the stream of the enhancement layer (EL) is transmitted through the Internet network.

As shown in FIG. 3, the hybrid network transport streaming module 120 includes a layer separator 121, a TS-Muxer 122 for a base layer, and a TS-Muxer 123 for an enhancement layer. ) And an enhancement layer provider 124. The NAL extractor 121 separates the base layer stream and the enhancement layer stream. Such a layer separator 121 may be referred to as a network adaptation layer (NAL). Each separate layer stream is provided to the TS-Muxer 122, 123. The base layer TS Muxer 122 merges the encoded audio stream into the base layer stream and converts the encoded audio stream into MPEG-2 TS (Transport Stream). The TS generated by merging the base layer and the audio is transmitted through the broadcasting network, and the client can watch the 2D video.

The TS muxer 123 for the enhancement layer converts only the enhancement layer into MPEG-2 TS. The converted enhancement layer TS is generated through streaming that can be transmitted based on HTTP through the enhancement layer provider 124. Metadata required for streaming generation is stored in the information about each element in the MPD (Media Presentation Description) file. The stored MPD file is transmitted through the Internet when the client requests it. The enhancement layer provider 124 segments the enhancement layer TS and stores the segmented TS file in a designated place so that the client can download it. By adapting the enhancement layer stream adaptively, it is possible to transmit the enhancement layer stream efficiently to the channel or the terminal environment when one or more enhancement layers are generated. The content image (right image) can be provided. In addition, the aforementioned enhancement layer providing unit 124 may be referred to as a TS-Segmenter & MPD Generator in that it serves as a segmenter and an MPD generator.

Meanwhile, the client system 200 may provide a high quality 3D image by receiving a base layer stream from a broadcasting network and an enhancement layer stream from an internet network, and adaptively provide a 2D compatible service according to a terminal. The client system 200 includes a hybrid network reception module 210, an adaptive SVC decoder 220, and a terminal for playing content.

The hybrid network receiving module 210 manages layers received through the broadcasting network and the Internet network, and has a function of synchronizing the transmitted two layers. As shown in FIG. 4, the hybrid network receiving module 210 includes a TS-Demuxer 211, a streaming control engine 212, and an access client 213 for a base layer. And a TS-Demuxer 214 and a synchronization module 215 for the enhancement layer. The base layer TS-Demuxer 211 separates the TS received through the broadcasting network into a stream and an audio stream of the base layer, and provides a time-stamp value of the base layer TS to the streaming control engine 212. Has

The streaming control engine 212 operates when a user of the terminal requests 3D viewing. When the user requests 3D viewing, the streaming control engine 212 requests and receives the MPD file from the delivery system 100. The streaming control engine 212 determines the segmented TS file at the present time by using the MPD file containing the timestamp and segment information of the 2D video transmitted and reproduced through the broadcasting network up to the present time, and downloads from the determined segmented TS file. Notifies the access client 213 so that it can. In other words, if the user requests 3D viewing while watching 2D, the client system 200 receives another image (right image) of the currently output 2D image (left image) through the Internet and outputs 3D. do. In this case, since the video must be provided from the same time point as the currently playing 2D video, the streaming control engine 212 requests the timestamp provided from the TS Demuxer 211 of the base layer and the MPD file received by requesting the transmission system 100. Segmented TS file at this point is determined by analyzing segment information.

The HTTP access client 213 downloads the segmented file from the position commanded by the streaming control engine 212 through the designated url path, and transfers the downloaded segmented TS to the TS demuxer 214 of the enhancement layer. The TS demuxer 214 of the enhancement layer converts the TS file into an encoded stream of the enhancement layer and outputs the encoded stream. The encoding stream generated by the base layer TS-Demuxer 211 and the enhancement layer TS-Demuxer 214 is provided to the synchronization module 215. The synchronization module 215 synchronizes the provided base layer encoded stream and the enhancement layer encoded stream into one scalable bit stream (SVC NAL). The synchronization module 215 synchronizes using TS time stamp values of the base layer and the enhancement layer.

The scalable bitstream generated in synchronization by the synchronization module 215 is provided to the adaptive SVC decoder 220. The adaptive SVC decoder 220 is composed of one decoder like the general decoder. However, the adaptive SVC decoder 220 according to an aspect of the present invention can decode the number of outputs of the reconstructed video through the SEI message encoded by the SVC encoder 110.

5 is a diagram illustrating a standard SVC decoding scheme.

When the encoded bitstream consisting of three layers is input to the standard SVC decoder as illustrated in FIG. 5, the reconstructed pictures of the base layer and the lower enhancement layer are used only as reference data. That is, the existing standard SVC decoder receives the encoded bitstream (SVC NAL), analyzes header information, and decodes the base layer (S510). The standard SVC decoder decodes the lower enhancement layer by using the reference data obtained in S510 (S520), and then decodes the highest enhancement layer by using the reference data obtained therefrom, and outputs an image having the image quality of the highest layer (S530). .

6 illustrates an SVC decoding scheme according to an embodiment of the present invention.

The adaptive SVC decoder 220 further reflects the improved technology for the 3D service in the standard SVC decoding scheme. This will be described in detail as follows. The adaptive SVC decoder 220 analyzes header information of the SVC NAL data and decodes the base layer (S610). The adaptive SVC decoder 220 checks whether the OID value specified in the SEI of the header information is "01" (S620). If "01", the adaptive SVC decoder 220 stores the base layer image reconstructed through decoding in a temporary buffer (S630). The adaptive SVC decoder 220 decodes the lower enhancement layer 1 using the reference data obtained through base layer decoding (S640). If it is determined in step S630 that the OID value is not "01", the adaptive SVC decoder 220 checks whether the OID value is "10" (S650). If the check result is "10", the adaptive SVC decoder 220 stores the lower enhancement layer image reconstructed through decoding in a temporary buffer (S660). Next, the adaptive SVC decoder 220 decodes the highest enhancement layer using reference data obtained through lower enhancement layer decoding (S670). The decoded top enhancement layer is output to the terminal. At this time, the base layer or the bottom enhancement layer stored in the temporary buffer is output together according to the OID value. If the OID value is "01", the base layer is restored and stored in a temporary buffer, and is output together when the highest enhancement layer (Enhancement layer 2) is restored and output. If the OID value is “10”, the lower enhancement layer 1 is restored and stored in the temporary buffer, and is output together when the uppermost enhancement layer 2 is restored and output.

The existing standard SVC decoder receives SVC NAL information, analyzes header information, and decodes the base layer. Decoded base layer information is used as a reference value in decoding the enhancement layers and discarded. By this procedure, the existing SVC outputs the image of the highest layer. However, the adaptive SVC decoder 220 according to the present invention has the same functions as the existing SVC decoder and is compatible with each other, and simultaneously outputs the base layer and the enhancement layer through the OID information specified in the SEI of the header information. When there is no OID information in the SEI header, the adaptive SVC decoder 220 recognizes the initial value of the OID as “00” and may decode the same method as the conventional method.

So far I looked at the center of the preferred embodiment for the present invention. 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. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

100: transmission system 110: SVC encoder
120: hybrid network transmission streaming module 121: layer separation unit
122: TS Muxer for base layer 123: TS Muxer for enhancement layer
124: enhancement layer provider 200: client system
210: hybrid network receiving module 211: TS Demuxer for the base layer
212: Streaming Control Engine 213: Access Client
214: TS Demuxer 215 for enhancement layer: synchronization module
220: adaptive SVC decoder

Claims (11)

An SVC encoder encoding 3D content of a left image and a right image; And
A base layer (BL) stream of the scalable bitstreams encoded by the SVC encoder is transmitted to a client system through a broadcasting network, and an enhancement layer (EL) stream is transmitted to a client system through an internet network. Hybrid network transport streaming module;
Transmission system for a hybrid 3D content service, characterized in that it comprises a. The method of claim 1,
And the hybrid network transport streaming module transmits the enhancement layer stream at the request of a client system. 3. The method of claim 2,
The SVC encoder includes information on the number of video images to be output by the decoder of the client system in the Supplemental Enhancement Information (SEI) according to the type of the content. 4. The hybrid network transport streaming module of claim 3, wherein:
A hierarchical separation unit for dividing the scalable bitstream encoded by the SVC encoder into a base layer and an enhancement layer;
A base layer TS multiplexer for converting the separated base layer stream into a transport stream (TS);
An enhancement layer TS multiplexer for converting the separated enhancement layer streams into transport streams; And
An enhancement layer provider for segmenting and storing the enhancement layer transport stream and streaming the segment from the segment file of the corresponding time point requested by the client system;
Transmission system for a hybrid 3D content service, characterized in that it comprises a. 5. The method of claim 4,
The base layer TS multiplexer merges the separated base layer stream and the audio stream. 5. The method of claim 4,
The enhancement layer providing unit generates a media presentation description (MPD) file based on the segmented content of the enhancement layer transport stream, and provides the same upon request of a client system. The method according to claim 6,
The enhancement layer providing unit is a transmission system for a hybrid 3D content service, characterized in that for streaming transmission based on HTTP (Hyper Text Transfer Protocol). A hybrid network reception module configured to receive a transport stream (TS) including a base layer stream from a transport system through a broadcast network and an enhancement layer stream through an internet network, and request and receive the enhancement layer stream from the transport system; And
An adaptive SVC decoder for decoding a stream received by the hybrid network receiving module to output a 2D image or to output a 3D image;
Client system for a hybrid 3D content service, characterized in that it comprises a. The method of claim 8, wherein the hybrid network receiving module is:
A TS demultiplexer for base layer that separates a transport stream received through a broadcasting network into a base layer stream and an audio stream;
Request and receive a Media Presentation Description (MPD) file from the transmission system, analyze the time stamp of the 2D video provided from the base layer TS demultiplexer and segment information of the received MPD file to improve the segment layer TS file at the start of download. A streaming control engine to determine;
An access client to download from the transmission system from the segment TS file at the time determined by the streaming control engine; And
An enhancement layer TS demultiplexer for converting the downloaded enhancement layer TS file into an enhancement layer stream;
A synchronization module for synchronizing the base layer stream and the enhancement layer stream to generate SVC NAL data which is a single scalable bitstream;
Client system for a hybrid 3D content service, characterized in that it comprises a. 10. The method of claim 9,
The streaming control engine is a client system for a hybrid 3D content service, characterized in that for requesting a 3D viewing of the user MPD file to the transmission system. 10. The method of claim 9,
The adaptive SVC decoder checks the number of output images by identifying SEI (Supplemental Enhancement Information) belonging to a header of an SVC NAL (Network Adaptation Layer), which is a single scalable bitstream generated by the synchronization module, and determines the number of output images. Client system for a hybrid 3D content service, characterized in that for outputting 2D video or 3D video according to the number of images.
KR1020130021539A 2012-06-29 2013-02-27 Transport system and client system for hybrid 3d contents service KR20140002471A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101656193B1 (en) * 2015-08-11 2016-09-22 서울여자대학교 산학협력단 MMT-based Broadcasting System and Method for UHD Video Streaming over Heterogeneous Networks
WO2018016879A1 (en) * 2016-07-19 2018-01-25 한국전자통신연구원 Method and device for providing 360-degree virtual reality broadcasting service
KR20180009725A (en) * 2016-07-19 2018-01-29 한국전자통신연구원 Method and apparatus for providing 360 degree virtual reality broadcasting services
US11082728B2 (en) 2018-08-31 2021-08-03 Electronics And Telecommunications Research Institute Method and apparatus for providing broadcast service based on scalable codec

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101656193B1 (en) * 2015-08-11 2016-09-22 서울여자대학교 산학협력단 MMT-based Broadcasting System and Method for UHD Video Streaming over Heterogeneous Networks
WO2018016879A1 (en) * 2016-07-19 2018-01-25 한국전자통신연구원 Method and device for providing 360-degree virtual reality broadcasting service
KR20180009725A (en) * 2016-07-19 2018-01-29 한국전자통신연구원 Method and apparatus for providing 360 degree virtual reality broadcasting services
US10931980B2 (en) 2016-07-19 2021-02-23 Electronics And Telecommunications Research Institute Method and apparatus for providing 360 degree virtual reality broadcasting service
US11082728B2 (en) 2018-08-31 2021-08-03 Electronics And Telecommunications Research Institute Method and apparatus for providing broadcast service based on scalable codec

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