• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.287-290
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• 2003

In recent years, one of the main trends of GIS is to construct and provide realistic and human-perceptible information of spatial object using video data. The rapid progress of wireless mobile technology makes the multimedia source using video data possible on mobile environment. Instead of traditional map-based service, video-based location services, that provide video data as location context, would be of interest in connection with various mobile applications requiring location service, such as telematics, LBS, etc. In this paper, we present the location service system using geo-referenced video on wireless mobile environment.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.133-136
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• 2003

In this paper, we propose a low bit-rate embedded video coding scheme with 3-D block partition in the wavelet domain. The proposed video coding scheme includes multi-level three dimensional dyadic wavelet decomposition, raster scanning within each subband, partitioning of blocks, and adaptive arithmetic entropy coding. Although the proposed video coding scheme is quite simple, it produces bit-streams with good features, including SNR scalability from the embedded nature. Experimental results demonstrate that the proposed video coding scheme is quite competitive to other good wavelet-based video coders in the literature.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(4)
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• pp.109-112
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• 2001

This paper proposes a method to classify different video contents using features of digital video. Classified video types are the news, drama, show, sports, and talk program. Features, such as intra-coded macroblock number St motion vector in P-picture in MPEG domain are used. The frame difference of YCbCr is also employed as a measure of classification. We detect the occurrences of cuts in a video for a measure of classification. Finally, back-propagation neural-network of 3 layers is used to classify video contents.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -3
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• pp.1582-1585
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• 2002

In recent years the demand for digital video and image communications has been increased tremendously. On the other hand, video communications requires very much bandwidth in comparison with other information types such as text and data. Thus to adapt with the bandwidth-limited channels, especially wireless channels, video source must be compressed extremely. A new video coding standard namely H.26L is being developed by Joint Video Team (JVT). In this paper performance of H.26L is analyzed in an AWGN environment.

• 한국통신학회논문지
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• 제22권11호
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• pp.2498-2511
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• 1997

최근 컴퓨터 기술의 발전과 초고속 통신망의 구축으로 컴퓨터 기술과 통신망이 통합되어 통신 인프라(Infrastructure)를 소프트웨어 구조의 시스템으로 적용한 정보 통신망 구조(Information Networking Architecture)위에서 멀티미디어 서비스를 제공하는 연구 활동이 활발히 전개되고 있다. 본 논문에서는 멀티미디어 서비스의 기본이 되는 화상 회의 서비스를 선정하여, 개방형 정보 통신망 구조에 적용하여, 화상 회의 서비스 세션 관리를 객체 모델링 하였으며, 본 개방형 화상 회의 서비스를 통하여 세션 그래프와 연결 그래프간의 매핑 등의 세션 관리 객체 모델링과 개방형 서비스 플랫폼에 대한 기술들을 검증하였다.

• 전자공학회논문지CI
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• 제42권2호
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• pp.11-20
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• 2005

기존의 화상회의 시스템은 화상회의 참석자 수가 n으로 증가함에 따라 대역폭과 메모리가 n^2 요구된다. 그리고 또한, 음성데이터의 전송도 참석자 수가 증가하면 그에 따른 트래픽 증가와 참석자의 발언권에 대한 문제를 갖는다. 본 논문에서는 화상 데이터를 위한 서버 측 버퍼링 기법과 발언권자의 증가에 따른 트래픽 증가 등의 문제를 해결하기위한 침묵탐지기법을 이용한 원격화상회의 알고리즘을 제안한다. 화상 버퍼링 알고리즘은 서버에서 다른 클라이언트로 브로드 캐스팅하는 기법이 아니라, 클라이언트로부터 압축된 비디오데이터를 할당된 버퍼에 전송 받는 서버측 버퍼링 기법과 클라이언트에서 다른 참석자들의 비디오데이터를 자신의 대역폭과 네트워크전송속도에 맞게 얻어가는 클라이언트 인덱스처리방법을 이용한 알고리즘이다. 침묵탐지기법을 이용한 음성전송 알고리즘은 다수의 참석자 중에서 말하지 않는 것으로 탐지된 음성데이터는 서버로 전송하지 않도록 하는 방법이며 채널관리 알고리즘은 우선권이 있는 참석자에게 발언권을 할당하는 방법이다. 제안한 알고리즘을 이용한 원격 화상회의 시스템은 참석자의 수와 관계없이 제한된 메모리와 대역폭 그리고 네트워크전송속도에서 20프레임 이상, 평균 30ms의 안정적인 화상데이터와 음성데이터전송이 이루어졌다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.192-194
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• 2005

Acceptance of the international standards for video compression, such as H.261, MPEG-1 and MPEG-2, along with the developments in video codec hardware, has created an explosion of application. Among these, the long time quest for long-distance digital video transmission causes an increasing interest in transporting compressed video over networks which are nontraditional for this purpose, including asynchronous transfer mode networks, the Internet, and cellular and wireless channels. Transmission of compression video over packet network is improved for error resilience. And layered video coding techniques improves error resilience. We present a efficient method of scalable video coding for low bandwidth.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(4)
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• pp.223-226
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• 2001

This paper suggest a fast multimedia delivery system. by using accelerated video. The system can delivery multimedia data faster and more effectively than previous delivery system. By using accelerated video, users can get information by least cost, and internet delivery server can send maximum information on limited bandwidth.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1997년도 International Conference MULTIMEDIA DATABASES on INTERNET
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• pp.24-48
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• 1997

. Supported byㆍDARPA′s image Understanding (IU) program under "Video Retrieval Based on Language and image Analysis" project.DARPA′s Computer Assisted Education and Training Initiative program (CAETI)ㆍObjective: Develop practical systems for automatic understanding and indexing of video sequences using both audio and video tracks(omitted)

• International journal of advanced smart convergence
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• 제11권2호
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• pp.108-117
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• 2022

The recent development of information and communication technology has a great impact on the audio/video industry. In particular, IP-based AoIP transmission technology and AVB technology are making changes in the audio/video market. Video signal transmission technology has been introduced to the market through a network, but it has not replaced the video switcher function. Video signals in the conference room or classroom are still controlled by the switching device. In order to switch input/output video devices, a cable that is not limited by distance must be connected to the switcher. In addition, the control of the switching device must be performed by a person who has received professional training. In this paper, it is a technology that can be operated even by non-experts by replacing complex video cables (RGB, DVI, HDMI, DP) with LAN cables and enabling IP-based video switching and transmission (Video Mirroring over IP: VMoIP) to replace video switcher equipment. We are going to do this study, I/O videos were controlled in the form of matrix and high-definition videos were transmitted without distortion, and VMoIP is expected to become the standard for video switching systems in the future.