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Publications (19)4.17 Total impact

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    ABSTRACT: This paper presents a study on the stereoscopic 3D codec for non-real-time 3DTV services. Delivering stereoscopic 3DTV contents via broadcast networks can be based on either real-time or non-real-time scenarios. For a digital television system where its bandwidth is somewhat limited to accommodate the full 3D HD quality video, a complementary enabler is the non-real-time delivery in which D video component is downloaded in advance. In the case of ATSC system, MPEG-2, H.264/AVC and any other codec can be used for stereoscopic video based on Non- Real-Time services. In order to put in the best performance, the analysis on the stereoscopic codec, scenarios and preliminary considerations are required. In this paper, the NRT 3D codec scenarios and preliminary considerations are addressed to develop the prerequisites required for the analysis on NRT 3D codec. The experimentation of both independent and inter-view coding are covered to investigate the codec combination for NRT D video services based on considerations and scenarios.
    Proc SPIE 02/2011;
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    ABSTRACT: This paper introduces a service framework of voice applications for mobile multimedia broadcasting featuring the ¿multimodal¿ concept which enables user interaction via speech and conventional GUI interfaces concurrently. We present the profiling of VoiceXML to develop a mobile version of speech enabled data service platform. In addition, the synchronization management, the broadcasting network interface and the GPS interfaces are newly defined for the mobile context.
    01/2010;
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    ABSTRACT: This paper presents a stereoscopic contents authoring system that covers the creation and editing of stereoscopic multimedia contents for the 3D DMB (Digital Multimedia Broadcasting) data services. The main concept of 3D DMB data service is that, instead of full 3D video, partial stereoscopic objects (stereoscopic JPEG, PNG and MNG) are stereoscopically displayed on the 2D background video plane. In order to provide stereoscopic objects, we design and implement a 3D DMB content authoring system which provides the convenient and straightforward contents creation and editing functionalities. For the creation of stereoscopic contents, we mainly focused on two methods: CG (Computer Graphics) based creation and real image based creation. In the CG based creation scenario where the generated CG data from the conventional MAYA or 3DS MAX tool is rendered to generate the stereoscopic images by applying the suitable disparity and camera parameters, we use X-file for the direct conversion to stereoscopic objects, so called 3D DMB objects. In the case of real image based creation, the chroma-key method is applied to real video sequences to acquire the alpha-mapped images which are in turn directly converted to stereoscopic objects. The stereoscopic content editing module includes the timeline editor for both the stereoscopic video and stereoscopic objects. For the verification of created stereoscopic contents, we implemented the content verification module to verify and modify the contents by adjusting the disparity. The proposed system will leverage the power of stereoscopic contents creation for mobile 3D data service especially targeted for T-DMB with the capabilities of CG and real image based contents creation, timeline editing and content verification.
    02/2009;
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    ABSTRACT: There is no method for providing bidirectional traffic and travel information (TTI) based on Internet Protocol (IP) to special interest group in safety using terrestrial-digital multimedia broadcasting (T-DMB). In order to solve this problem, we propose a new TPEG application protocol based on IPv6 interoperable with TPEG protocol, and introduce the TTI data server and the bidirectional TTI contents server. The receiving platform based on laptop computer is connected to T-DMB receiver and CDMA modem simultaneously, and it includes TPEG-IPv6 processing module complied with the proposed application protocol. The stability and effectiveness of the proposed TPEG-IPv6 application protocol is verified through the field test.
    Consumer Electronics, 2007. ISCE 2007. IEEE International Symposium on; 07/2007
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    ABSTRACT: DMB BWS has come into the spotlight owing to low service charge, the friendly user interface, and low system overhead. None the less, the GUI-based operation and the inefficient authoring lay a burden on mobile service users and contents providers. In this paper, we propose DMBWeb that complements and extends T-DMB BWS. DMBWeb provides a multi-modal user interface and employs a dedicated authoring tool, which separates contents into data and presentation and generates content documents automatically. This approach results in an easy access for mobile users and an improved productivity for a content provider.
    Consumer Electronics, 2007. ISCE 2007. IEEE International Symposium on; 07/2007
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    ABSTRACT: In this paper, we describe a new 1/4 rate robust modulation techniques for Enhanced-xVSB system which is fully backward compatible with ATSC 8-VSB standard. 1/4 rate mode Enhanced-xVSB system provides broadcasters with a wide choice of trade-offs of data rate vs amount of robustness of enhanced data for pedestrian/mobile services. Lab test results of proposed Enhanced-xVSB 1/4 rate mode robust stream is a significantly improved multipath as well as AWGN reception performance for Enhanced-xVSB receiver. We suggest an Enhanced-xVSB terrestrial broadcasting system for ATSC HDTV and pedestrian/portable TV simultaneous broadcasting service providing
    IEEE Transactions on Broadcasting 07/2007; · 2.09 Impact Factor
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    ABSTRACT: This paper proposes the network structure and service model to deliver new traffic and travel information (TTI) services over terrestrial digital multimedia broadcasting (T-DMB) and a bidirectional network. We have newly specified a POI (point-of-interest) and a NWS (news information) application services which are perfectly compatible with TPEG (transport protocol expert group) protocols, and implemented T-DMB based TTI systems including TPEG encoder/decoder and a return-channel server system through CDMA as a bidirectional network. In the real-field environment as verifying the proposed services and systems above, we showed their stability and effectiveness by the excellent results in this paper.
    Consumer Electronics, 2007. ICCE 2007. Digest of Technical Papers. International Conference on; 02/2007
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    ABSTRACT: Terrestrial-Digital Multimedia Broadcasting (T-DMB) can provide a variety of data services such as traffic and travel information (TTI), EPG and BWS. Among these data services, the demand of TTI service has dramatically increased due to rapid increase in the number of vehicles and population of frequently traveling on long-weekends. In order to providing TTI services, TPEG protocol was developed. However, it has been applied merely to two application areas such as RTM and PTI. Recently, the traffic status image information (TSI) service based on still image or moving pictures becomes more important because public confidence about the accuracy of currently used coded-traffic information is low. In this paper, we propose a novel bidirectional TSI application. It can overcome the drawbacks of conventional RTM service, which cannot provide any subjective route decision chance to users. The proposed application protocol is designed to be interoperable with TPEG and can be provided in T-DMB. To verify the stability of proposed application protocol, we implemented the data server/client, the receiving platform and the bidirectional contents server/host server. Through an experimental broadcasting using by T-DMB and wireless communication networks, it is shown that the proposed bidirectional TSI application protocol operates stably and effectively.
    Proc SPIE 02/2007;
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    ABSTRACT: This paper proposes the network structure and services model to deliver new Traffic and Travel Information (TTI) value-added services over a hybrid-network of Terrestrial Digital Multimedia Broadcasting (T-DMB) and a bidirectional network. We have newly specified a POI (Point-Of-Interest) and a NWS (News Information) application services which are perfectly compatible with TPEG (Transport Protocol Expert Group) protocols, and implemented T-DMB based TTI systems including TPEG encoder/decoder and a return-channel server system through CDMA as a bidirectional network. We verified the proposed services and their related systems in the real-field environment and showed their excellent results in this paper1.
    Proceedings of the 66th IEEE Vehicular Technology Conference, VTC Fall 2007, 30 September - 3 October 2007, Baltimore, MD, USA; 01/2007
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    ABSTRACT: The demand of travel and traffic information (TTI) service has dramatically increased due to rapid increment in the number of vehicles and population of frequently traveling on long weekends. In order to satisfying such a demand, a transport protocol experts group (TPEG) protocol was developed. However, merely two TPEG applications were standardized up to now. This paper presents a novel application, traffic status image information (TSI) application compatible to the existing TPEG protocol, which can be provided in T-DMB network. To verify the stability of TSI protocol, we implemented TSI data server/client, and T-DMB receiver with TSI decoder. Through an experimental broadcasting in the local DMB network, it is shown that the proposed application operates stably and effectively in the verification receiver.
    01/2007;
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    ABSTRACT: This paper describes advanced dual stream system for improving mobile/pedestrian reception performance to the ATSC DTV 8-VSB transmission standard. E-xVSB system can transmit a mixture of normal (8-VSB) stream and enhanced (robust) stream. The robust stream has a higher threshold of visibility (TOV) compared to the standard stream, and legacy receivers ignore the robust packets. Thus, Enhanced-xVSB system is fully backward compatible with a current ATSC standard. For more robust transmission support, E-xVSB system adopts a reduced constellation method as well as enhanced trellis-coded modulation scheme. E-xVSB system supports a variety of enhanced modulation schemes: Pseudo-2VSB, Enhanced-4VSB, modified Enhanced-8VSB and Hybrid-VSB. Proposed system has been tested in the Lab, and the testing results are shown in this paper.
    IEEE Transactions on Broadcasting 07/2006; · 2.09 Impact Factor
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    ABSTRACT: In this paper, we propose a new three-dimensional television broadcasting system (3DTV) that is fully compatible with the existing DTV system. Specifically, we propose the PMT structure for 3DTV service including a new descriptor. As a result of our subjective evaluation test, most of participants perceived the 3D depth of 3DTV as "good", and preferred a 3DTV to the conventional digital broadcasting service. Moreover, we confirmed the compatibility with the commercial DTV STB.
    Consumer Electronics, 2006. ICCE '06. 2006 Digest of Technical Papers. International Conference on; 02/2006
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    ABSTRACT: This paper presents a new location based service (LBS) that can be provided in digital multimedia broadcasting (DMB) transmission system economically and effectively. We propose a point of interest (POI) protocol compatible to transport protocol experts group (TPEG) and introduce the POI data server and the verification platform implemented by using the proposed protocol. As a filed result, the stability and effectiveness of proposed protocol is verified.
    Consumer Electronics, 2006. ICCE '06. 2006 Digest of Technical Papers. International Conference on; 02/2006
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    ABSTRACT: The digital multimedia broadcasting (DMB) allows can provide an economical way of massive multimedia data services, thus, it is emerging as an optimal solution to address the several drawbacks of the mobile communication network. Among the data services based on the DMB, the traffic and travel Information (TTI) service has been spotlighted in aspects of economic influence and information usability. For example, the demand of TTI service has dramatically increased due to rapid increase in the number of vehicles and population of frequently traveling on long-weekends. In order to satisfying such a demanding, a transport protocol experts group (TPEG) protocol was developed. However, TPEG has been applied merely to two application areas up to now and there is no consideration to standardize new services very valuable for drivers and travelers. This paper presents new economic and effective point of interest (POI) and news services compatible to TPEG that can be provided in the DMB. To verify the stability of POI and news protocols, we implemented the TTI data server/client, and the DMB/DAB receiver with the TTI decoder. Through the experimental broadcasting in the local DMB network, it is shown that the proposed protocol operates stably and effectively in the navigation system.
    Proc SPIE 02/2006;
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    ABSTRACT: This paper presents a new bidirectional location based service (LBS) using terrestrial-digital multimedia broadcasting (T-DMB) and wireless communication network. We propose a new bidirectional POI (point-of-interest) application interoperable with TPEG protocol, and introduce the POI data server/client in T-DMB network and the bidirectional TTI contents server/host server in wireless communication network The receiving platform based on laptop computer is connected to T-DMB receiver and CDMA modem simultaneously, and it includes the TPEG decoder implemented by using the proposed protocol. The stability and effectiveness of the proposed protocol is verified through the field test.
    Proceedings of the 64th IEEE Vehicular Technology Conference, VTC Fall 2006, 25-28 September 2006, Montréal, Québec, Canada; 01/2006
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    ABSTRACT: This paper introduces the architecture of the terrestrial digital multimedia broadcasting (T-DMB) transmission system. The layered structure of T-DMB ensemble for video service is studied to develop a novel ensemble analysis system which consists of a hardware module for signal processing and a software module for analysis processing
    01/2006;
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    ABSTRACT: This paper introduces T-DMB (terrestrial digital multimedia broadcasting) receiver to provide TTI (traffic and traveler information) service through T-DMB signal. TTI service is one of the most popular services among the data services based on T-DMB, because many people need real time traffic information to avoid the traffic jam caused by the rapid increase in the traffic volume. Many travelers also want travel information around the interested point to visit. In order to satisfy these demands, we developed T-DMB receiver for TTI service based on T-DMB system having high performance in mobility and reception. This receiver can receive two kinds of services simultaneously, and so we can get TTI service while watching the video service through T-DMB in a car. In this paper, we describe the design and implementation of the receiver and then show the TTI service, which includes RTM (road traffic message), PTI (public transport information), POI (point of interest) and NEWS.
    Proceedings of the 64th IEEE Vehicular Technology Conference, VTC Fall 2006, 25-28 September 2006, Montréal, Québec, Canada; 01/2006
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    ABSTRACT: In this paper, we propose a novel method that can generate a computer-generated hologram (CGH) from the depth stream and color video outputs provided by ENG camera. To generate CGH, distinguished from an existing electronic holographic display system that uses a computer graphic model, we utilizes video image from a depth camera. This procedure consists of two steps that the acquisition of a depth-annotated image of real object, and generation of CGH according to the 3D information that is extracted from the depth cue. Experimentally, we display the generated CGH via a holographic display system using liquid-crystal display.
    Proc SPIE 04/2005;
  • Signal and Image Processing (SIP 2003), Proceedings of the IASTED International Conference, August 13-15, 2003, Honolulu, HI, USA; 01/2003