• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.424-426
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• 2023

비디오 월 컨트롤러의 멀티스크린에 영상을 표출하기 위해서는 입력 영상과 영상의 수신 및 표출을 수행하는 클라이언트 프로그램이 필요하다. 입력 영상을 얻기 위한 수단으로는 영상 송출이 가능한 장비를 케이블로 연결하거나 네트워크를 통해 수신하는 방법이 있다. 많은 스트리밍 장치를 보유하고 있는 시스템에서는 관리가 용이한 영상분배서버를 사용하는 것이 효율적이지만, 통상의 영상분배 서버는 컴퓨터 비전 기술을 탑재하고 있지 않고 일단 스트리밍을 시작한 후에는 스트리밍 장치를 변경할 수 없는 단점이 있다. 이에 본 논문에서는 스트리밍을 실행한 후에도 스트리밍 장치를 전환하여 스트림을 전송할 수 있는 얼굴 인식 기반의 영상분배 시스템을 제안한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.9
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• pp.67-74
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• 2008

This paper proposes, designs and implements an architecture of a server involved with the network camera based video surveillance systems to solve common problems including lack of inter-network operability at the video information sharing, drawback of bandwidth and processing-overhead caused by increase of the number of users, and difficulty of continuous monitoring over changes of network configurations. The proposed saver was designed to manage and service numerous network cameras and users as well as solving the existing problems by providing video distribution facility. Through the empirical study after applying the implemented server to a real video surveillance system we proved that the server can provide reasonable service quality while it processes several hundreds of simultaneous user connections under persisting more than one hundred connections to network cameras. We expect the developed video distribution server to enhance service quality of the large scale video surveillance systems for citizen-wide services such as traffic reporting informatics or natural calamities supporting.

• Journal of the Korean Association of Geographic Information Studies
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• v.1 no.2
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• pp.37-43
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• 1998

This paper presents a KITSAT-3 image catalog browse and distribution system. The access time and easy-to-use concept of the system should be highlighted in order for satellite image users to browse and order the required images as quickly and easily as possible. In general, users want to enter their image search conditions in the simplest ways and to display the search results which can be interpreted intuitively. The KITSAT-3 image catalog browse and distribution system was developed to satisfy the users' requirements with the minimum system installation cost.

• The KIPS Transactions:PartC
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• v.11C no.7 s.96
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• pp.971-980
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• 2004

This paper describes the design and implementation of the video conferencing system using public key infrastructure which is used for user authentication and encryption. Public key infrastructure reinforces the authentication process for conference participant, and the symmetric key system blocks malicious access to information and protect conference control information. This paper shows the implementation of the trans portation layer secure protocol in conformity with Korea public key authentication algorithm standard and symmetric encryption algorithm (DES, 3DES and AES) for media stream encryption. In this paper, we deal with two ways of protecting information : transportation layer secure protocol secures user authentication process and the conference control information; while public key-based authentication system protects personal information of users when they connect to the network. When distributing the session keys for encryption, Internet Key Exchange is used for P2P communication, and secure protocol is employed for 1 : N multi-user communication in the way of distributing the public key-based en-cryption key.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.17 no.11
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• pp.4-10
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• 1999

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.519-520
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• 2009

무선 동영상 공유 시스템은 가정이나 사무실 등 에서 여러 사람들이 분배기에 접속 하여 TV 방송을 시청할 수 있는 시스템이다. 분배기는 n개의 튜너를 내장하며 사용자는 동시에 n개의 채널만 시청 할 수 있다. 이러한 한정된 자원 내에서 사용자들의 요구를 충족 할 수 있도록 사용자 관리 정책을 제안하였다.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.493-496
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• 2000

본 논문에서는 TMS320C6201 DSP (Digial Signal Processor)를 이용하여 실시간 영상 부호화기를 구현하였다. 기본적인 영상 압축 방법으로는 baseline-JPEG을 사용하였고 이에 움직임 검출 알고리즘을 부가하여 영상의 시간적인 중복성을 제거하였다. 특히 저속 메모리와 고속 메모리의 효율적인 분배 사용, 계산량이 많은 모듈의 최적화, 데이터의 병렬 연산과 DMA (Direct Memory Access)를 이용한 데이터 전송 등의 방법을 통하여 실시간 영상 부호화기의 고속 영상 처리에 중점을 두었다.

• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.1-9
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• 2011

The Communication Ocean and Meteorological Satellite(COMS), the first geostationary observation satellite, was successfully launched on June 27th in 2010. The raw data of Meteorological Imager(MI) and Geostationary Ocean Color Imager(GOCI), the main payloads of COMS, is delivered to end-users through the on-ground processing. The COMS Image Data Acquisition and Control System(IDACS) developed by Korea Aerospace Research Institute(KARI) in domestic technologies performs radiometric and geometric corrections to raw data and disseminates pre-processed image data and additional data to end-users through the satellite. Currently the IDACS is in the nominal operations phase after successful in-orbit testing and operates in National Meteorological Satellite Center, Korea Ocean Satellite Center, and Satellite Operations Center, During the in-orbit test period, validations on functionalities and performance IDACS were divided into 1) image data acquisition and transmission, 2) preprocessing of MI and GOCI raw data, and 3) end-user dissemination. This paper presents that IDACS' operational validation results performed during the in-orbit test period after COMS' launch.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.2A
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• pp.130-136
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• 2002

It is required to control the picture quality among video sources when the multiple video sources are together transmitted through the channel of fried bandwidth such as satellite and terrestrial broadcasting. This paper presents a control method to keep the uniform picture quality among the video sources. We first find a model of distortion and titrate far the multiplexing system of multiple sources. Then we allocate the bitrate to each source for uniformly divided picture quality among the sources by using the distortion-bitrate relationship for the real-time implementation without time delay. It is shown by simulation that the proposed quality control method can keep almost uniform picture quality among the sources in comparison to the conventional control method.

• Journal of Korea Multimedia Society
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• v.3 no.6
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• pp.557-565
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• 2000

According to CORBA specification, there are some mechanisms for object reference management such as Naming Service and Trading service, but these mechanism cant's supply all functionalities needed fomanagement in MICS. So, We have designed and implemented additional special-purpose IPO manager. It provides load balancing service based on real-time information for IPO and fault-tolerable services with the management of redundant IPOs and also provides transparent configuration of client environment with the lists of registered IPOs.