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ATSC is currently working on standardization of hybrid 3DTV broadcasting service in heterogenous network environment after completion of service-compatible 3DTV broadcasting service standard based on broadcasting channel. This paper proposes a convergence 3D video broadcasting method on broadcasting and IP network while guaranteeing a Full-HD 3D quality without degrading the image quality of legacy DTV. Specifically, this paper describes transmission of the 3D additional video using the ISO/IEC 23009-1 DASH, robust synchronization method under heterogenous network environments and system target decoder model for hybrid 3DTV receiver. Based on experimental results, we confirm that proposed technologies can be used as a core technology in the hybrid 3DTV standardization and a reference model for a development of hybrid 3DTV encoder and receiver. Keyword : 3DTV, ATSC, Hybrid, Stereoscopic, DTV, STD 정규논문 (Regular Paper) 방송공학회논문지 제19권 제5호, 2014년 9월 (JBE Vol. 19, No. 5, September 2014) http://dx.doi.org/10.5909/JBE.2014.19.5.687 ISSN 2287-9137 (Online) ISSN 1226-7953 (Print) 688 방송공학회논문지 제19권 제5호, 2014년 9월 (JBE Vol. 19, No. 5, September 2014) 그림 1. 이종망 연동형 3D 비디오 방송서비스 개념도 Fig.1. Conceptual diagram of hybrid network associated 3D video broadcasting service I. 서 론 사용자의 몰입감과 현장감을 극대화할 수 있는 실감 미 디어는 “스마트”로 대표되는 정보통신 분야의 개발 방향과 함께 사회의 키워드로 점차 자리 매김하고 있다. 실감 미디 어는 공간과 시간의 제약을 극복하고 인간에게 자연감과 사실감을 극대화 할 수 있는 미디어로서 현장감/입체감을 제공하는 3D 분야 및 초고화질을 제공하는 UHD 분야를 중심으로 핵심기술을 선점하기 위한 노력이 전 세계적으로 진행되고 있다 . 특히 3D 영화의 성공은 3D 미디어를 극 장과 같은 특화된 환경이 아닌 댁내와 같은 일반 시청환경 하에서도 현장감과 입체감을 제공하기 위한 노력이 지속적 으로 이어지고 있으며, 이와 같이 시청자에게 대용량의 고 화질 3D 콘텐츠를 제공하는 하나의 방법으로 다양한 네트 워크의 융합을 통한 서비스로 발전되고 있다 . ATSC(Advanced Television System Committee), DVB (Digital Video Broadcasting) 및 TTA(Telecommunications Technology Association) 등 전 세계 표준단체를 중심으로 제정된 서비스호환 3DTV 방송방식은 기존 DTV와 호 환성을 유지하면서 3D 비디오를 한 프레임 내 다중화한 단 일 영상을 서비스하는 프레임호환 3DTV 방송서비스에 비하여 고화질의 3DTV 방송서비스가 가능하나 기존 방송 망 대역폭을 통하여 좌우영상을 제공함으로써 Full HD 화 질을 제공하지 못하는 단점이 있다 . 이를 반영하듯 ATSC 는 2012년 12월 방송망기반 서비스호환 지상파 3DTV 방 송서비스 표준 완료 이후 현재 방송망 및 IP망을 결합한 하 이브리드 3DTV 방송서비스에 초점을 맞추어 표준화를 추 진 중에 있다. 하이브리드 3DTV 방송서비스는 스마트TV 환경 하에서 기존 DTV 화질 열화 없이 시청자에게 FULL HD 3D 비디오 제공이라는 핵심 요구사항을 토대로 이종망 연동 3D 비디오 전송에 따른 시그널링, 좌우영상 동기화 및 수신기 내에서 안정적인 3D 비디오 재생을 위한 시스템 타겟 디코더 모델이 핵심기술로 요구되고 있다 . 이에 본 논문에서는 이종망기반의 하이브리드 3DTV 방 송서비스를 위하여 필수적으로 요구되는 시그널링, 동기 화 및 시스템 타겟 디코더 모델을 제시하고 이를 기반으로 한 하이브리드 3D비디오 방송시스템을 제안한다. 이를 위 해 본 논문의 II장에서는 제안한 이종망 융합형 3D 비디오 방송서비스 개요, 서비스 시그널링 구조, 이종망기반 3D 비디오 동기화 및 시스템 타겟 디코더 모델 등 핵심기술을 설명하고, III장에서는 제안한 기술을 토대로 3D 비디오를 송수신하기 위한 방송시스템 개발 및 실험결과를, 마지막 으로 IV장에서 결론 및 향후 연구에 대하여 기술한다. II. 이종망 연동형 3D 비디오 방송서비스

Multi-screen service is a service that consumes more than one media in a number of terminals simultaneously or discriminately. This multi-screen service has become useful due to distribute of smart TV and terminals. Also, in case of hybrid broadcasting environment that is convergence of broadcasting and communication environment, it is able to provide various user experience through contents consumed by multiple screens. In hybrid broadcasting environment, scene composition technology can be used as an element technology for multi-screen service. Using scene composition technology, multiple media can be consumed complexly through the specified presentation time and space. Thus, multi-screen service based on the scene composition technology can provide spatial and temporal control and consumption of multiple media by linkage between the terminals. However, existing scene composition technologies are not able to use easily in hybrid broadcasting because of applicable environmental constraints, the difficulty in applying the various terminal and complexity. For this problems, HTML5 can be considered. HTML5 is expected to be applied in various smart terminals commonly, and provides consumption of diverse media. So, in this paper, it proposes the scene composition and multi-screen service technology based on HTML5 that is expected be used in various smart terminals providing hybrid broadcasting environment. For this, it includes the introduction in terms of HTML5 and multi-screen service, the method of providing information related with scene composition and multi-screen service through the extention of elements and attributes in HTML5, media signaling between terminals and the method of synchronization. In addition, the proposed scene composition and multi-screen service technology based on HTML5 was verified through the implementation and experiment.

Hybrid broadcasting environment is convergence of broadcasting and communication environment. In hybrid broadcasting environment, a number of media can be delivered using both broadcasting channel and other network unlike traditional broadcast environment that is able to deliver a couple of media by the limited bandwidth. Now, starting with smart TV, hybrid broadcasting environment combining broadcasting channel and IP network is established, and a variety of services are appearing. Moreover, the services using hybrid broadcasting environment are expected to appear soon for the other smart terminals such as smart phone and tablet PC. Scene composition is one of the methods that can consume effectively a number of media delivered from hybrid broadcasting environment. Using scene composition, multiple media can be consumed through the specified presentation time and space. Therefore, in this paper, it proposes the scene composition technology that is suitable for hybrid broadcasting environment and smart terminals. However, the spatial composition and temporal composition of media using script language and style language of HTML5 might increase the complexity of processing, and cause limitation of avaliable terminals. Also, a document of HTML5 can describe only one scene. By these reason, the proposed scene composition technology extends HTML5 in order to provide the spatial and temporal composition of media and description of multiple scene through markup language. In addition, it includes the extension of HTML5 in terms of utilization in hybrid broadcasting environment. For this proposal, this paper describes the technology of HTML5 and proposed scene composition. Also, it verifies the scene composition with both implementations and experiments.

Richmedia Service means that interactive media service can provide view with various multimedia elements(such as Video, Audio, Text) at same time. Various Multimedia elements can be serviced by Scene Description technology standards like BIFS(Binary Format for Scenes) and LASeR(Light Application Scene Representation). By providing Scene Component information, richmedia service is available to various multimedia services. so users is available to personalized services fitting temporal and spatial options. In conventional technology, when the scene is changed by user or service, mobile deletes the scene of configuration information and makes new scene of configuration information. this is a very inefficient way. In this paper, Propoesed that by using DOM(Document Object Model) method, to pass only the dynamic configuration part, changes scene method.

Recently, 3D stereoscopic video and HTTP adaptive streaming technologies have received a lot of attention from relevant industrial fields and markets in terms of multimedia contents and delivery services, respectively. It is expected that promising and marketable service models can be created by means of these noticeable two technologies. However, current standard specifications do not provide a method for organized connection between those two technologies. 3D stereoscopic video services are weighted in broadcasting and storage services that are only available under environments in which the network bandwidth is guaranteed or free. Also, HTTP adaptive streaming technologies only provide plain 3D service methods that are dependent on particular Codec. Therefore, this paper proposes 3D video delivery format for HTTP adaptive streaming service which enables stable and seamless display for various stereoscopic video sequences over internet networks. The proposed technology is designed on the basis of Stereoscopic Video Application Format which is a service-oriented standard specification for storing stereoscopic video sequences. Also, this delivery format is directly applicable over DASH that is the representative standard technology for HTTP adaptive streaming services. The delivery format proposed in this paper has been submitted to MPEG and it has been accepted as a working draft, thus it expected to pave the way for practical industrialization in relevant fields from now on.

Recently, many consumer electronics manufacturers have produced 3D devices such as 3DTVs and 3D monitors as interests in a stereoscopic video service are getting increased. However, most of 3D services are focused on local storage or bandwidth guaranteed service since 3D stereoscopic video service require bandwidth more stable and larger. This property causes difficulties in seamless stereoscopic video streaming services under IP based open network environment that cannot guarantee quality of services. In order to achieve a seamless video streaming service the international standard organization MPEG (Moving Pictures Experts Group) has developed the adaptive HTTP streaming technology called as DASH (Dynamic Adaptive Streaming over HTTP). However, the DASH doesn`t have obvious scheme which can express the two elementary video streams based service-compatible stereoscopic contents in one segment. Therefore, this paper proposes a scheme of efficient 3D adaptive streaming service based on the DASH, which covers not only frame-packing stereoscopic contents but also service-compatible ones. The 3D adaptive HTTP streaming scheme introduced in this paper is able to provide 3D contents with various qualities to user and also has benefit that single 3D content can be applied to a variety of devices.

This paper proposes a signaling and multiplexing mechanism in service-compatible 3DTV broadcasting for guaranteeing backward-compatibility with legacy DTV. Recently, 3DTV experimental broadcasting services are being developed around advanced countries and the standardization of service-compatible 3DTV broadcasting which is able to provide high-quality stereoscopic videos in progress. Based on experimental results, we confirm that proposed method can be used as a common technology and a reference model for stereoscopic video transmission over terrestial, satellite and cable DTV platforms in 3DTV broadcasting service and system development.

This paper proposes an efficient transmission method for the panoramic multimedia contents. The panoramic video provides wide sight and various view-point to the user. The traditional methods of the panoramic multimedia content transmission has several limitations, as follow; A client suffers a long initial delay time to play a panoramic video when it is transmitted through a limited bandwidth network, because the panoramic video has larger data size than a general video. And if a client's display device has limited resolution, such as mobile phone, laptop PC monitor, etc. it can not display the entire panoramic video that has a wide view video sequence. So, in order to overcome the obstacles, this paper proposes an efficient transmission of panoramic multimedia contents. This method will increase the transmission efficiency throughout the technique of the scene description in MPEG-4 system. Also we demonstrated the efficiency of the proposed method by comparison with existing methods.

T-DMB hybrid data service provides advanced data services while maintaining backward compatibility with legacy T-DMB receivers by using hybrid BIFS technology enabling distributed delivery of scene description information and object description information. This paper presents the hybrid service authoring framework implementing hybrid BIFS technology for creating contents for distributed delivery, and the results of experiments by using it. Hybrid service authoring framework is comprised of service creation system, service management system, and contents offering system. It enables the creation of combined hybrid data service and the splitting of the contents into two parts for ecah delivery network, data for broadcasting network and the data for mobile network. It also enables the managements of the contents. The feasibility of advanced data services while maintaining backward compatibility with the legacy T-DMB receiver has been proved by the contents created by using the hybrid authoring framework presented in this paper. Keyword : T-DMB, hybrid service, interactive data service, MPEG-4 BIFS

Recently, with the digitalization of a broadcasting system and the development of a communication technology, the existing trend of consuming media contents throughout the fixed-displayer and the dedicated channel is being changed. The existing user only could consume media contents under limited time and places because of the fixed-displayer and the dedicated channel. However, with advent of the IP-based terminals and HTTP adaptive streaming which transfer the media sequence according to the user`s transmission condition, users become possible to enjoy the media content anytime anywhere. As the result of the alteration of the broadcasting surrounding, users can enjoy the media content while changing his terminals according to their preferences and circumstances. However, in case that users try to consume consecutively the content from last view-point ended in the previous terminal under current HTTP adaptive streaming environment, a user has to remember the last view-point, and then has to apply the view-point to the changed terminal. Thus, for solving this problem, this paper defines "User Profile" for describing the metadata for the chained content consume environment between the terminals. Also, for proving the proposed method, this paper try to demonstrate the proposed method throughout the realization of the system based on Smooth Streaming from Microsoft.

Stereoscopic video service is one of the most widely adopted technologies for 3-Dimensional technology. However, the stereoscopic video service has not been penetrated into the market since there does not exist a proper transmission method even though the conventional MPEG-2 Transport Stream (TS) has support for broadcast service of mono-scopic video contents. This is partly because the MPEG-2 TS does not support displaying a stereoscopic video content which consists of several composition types widely used in the market. This paper proposes the new MPEG-2 TS specification suitable for transmitting and displaying stereoscopic video contents. In order to show feasibility of the proposal, this paper describes an end-to-end system which is implemented with consideration of the method how to multiplex and de-multiplex stereoscopic video contents as well as keeping backward compatibility with the traditional MPEG-2 TS.