• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(3)
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• pp.213-216
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• 2001

Key frame extraction is an important method of summarizing a long video. This paper propose a technique to automatically extract several key frames representative of its content from video. We use the color layout descriptor to select key frames from video. For selection of key frames, we calculate similarity of color layout features extracted from video, and extract key frames using similarity. An important aspect of our algorithm is that does not assume a fixed number of key frames per video; instead, it selects the number of appropriate key frames of summarizing a long video Experimental results show that our method using color layout descriptor can successfully select several key frames from a video, and we confirmed that the processing speed for extracting key frames from video is considerably fast.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2830-2832
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• 2005

Recently, retrieval or various video data has become an important issue as more and more multimedia content services are being provided. To effectively deal with video data, a semantic-based retrieval scheme that allows for processing diverse user queries and saving them on the database is required. In this regard, this paper proposes a semantic-based video retrieval system that allows the user to search diverse meanings of video data for electrical safetyrelated educational purposes by means of automatic annotation processing. If the user inputs a keyword to search video data for electrical safety-related educational purposes, the mobile agent of the proposed system extracts the features of the video data that are afterwards learned in a continuous manner, and detailed information on electrical safety education is saved on the database. The proposed system is designed to enhance video data retrieval efficiency for electrical safety-related educational purposes.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.361-362
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• 2008

Video quality is degraded by codec and transmission error. By analyses video pattern through NR(no reference) method, we get to aware that telephony video has particular blocking and blurring pattern and NR is suitable for telephony video quality testing. So NR will make contribution to enhancing video quality and monitoring video quality in advance.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.517-520
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• 2003

Commercial video scope use CCD sensor and frame grabber for image capture and A/D interface but application limited by input resolution and high cost. In this paper we introduce portable video scope using CMOS sensor, USB pen and tuner card (low frame grabber) in place of commercial CCD sensor and frame grabber. Our video scope serves as an essential link between advancing commercial technology and research, providing cost effective solutions for educational, engineering and medical applications across an entire spectrum of needs. The software implementation is done using Direct Show in second version after initial trials using First version VFW (video for window), which gave very low frame rate. Our video scope operates on windows 98, ME, XP, 2000. The drawback of our video scope is crossover problem in output images caused due to interpolation, which has to be rectified for more efficient performance.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2006년도 춘계학술발표논문집
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• pp.320-323
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• 2006

Recently, retrieval of various video data has become an important issue as more and more multimedia content services are being provided. To effectively deal with video data, a semantic-based retrieval scheme that allows for processing diverse user queries and saving them on the database is required. In this regard, this paper proposes a semantic-based video retrieval system that allows the user to search diverse meanings of video data for electrical safetyrelated educational purposes by means of automatic annotation processing. If the user inputs a keyword to search video data for electrical safety-related educational purposes, the mobile agent of the proposed system extracts the features of the video data that are afterwards learned in a continuous manner, and detailed information on electrical safety education is saved on the database. The proposed system is designed to enhance video data retrieval efficiency for electrical safety-related educational purposes.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1665-1667
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• 2007

Recently, retrieval of various video data has become an important issue as more and more multimedia content services are being provided. To effectively deal with video data, a semantic-based retrieval scheme that allows for processing diverse user queries and saving them on the database is required. In this regard, this paper proposes a semantic-based video retrieval system that allows the user to search diverse meanings of video data for electrical safetyrelated educational purposes by means of automatic annotation processing. If the user inputs a keyword to search video data for electrical safety-related educational purposes, the mobile agent of the proposed system extracts the features of the video data that are afterwards learned in a continuous manner, and detailed information on electrical safety education is saved on the database. The proposed system is designed to enhance video data retrieval efficiency for electrical safety-related educational purposes.

• Journal of information and communication convergence engineering
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• 제20권3호
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• pp.189-194
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• 2022

As non-face-to-face activities have become commonplace, online video conferencing platforms have become popular collaboration tools. However, existing video conferencing platforms have a structure in which one side unilaterally exchanges information, potentially increase the fatigue of meeting participants. In this study, we designed a video conferencing platform utilizing virtual reality (VR), a metaverse technology, to enable various interactions. A virtual conferencing space and realistic VR video conferencing content authoring tool support system were designed using Meta's Oculus Quest 2 hardware, the Unity engine, and 3D Max software. With the Photon software development kit, voice recognition was designed to perform automatic text translation with the Watson application programming interface, allowing the online video conferencing participants to communicate smoothly even if using different languages. It is expected that the proposed video conferencing platform will enable conference participants to interact and improve their work efficiency.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.3306-3311
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• 2011

Last Subway video surveillance system consists of a network device that is used. Through the network to transmit video data to digital conversion of analog video via a process server or a PC video to a split-screen in various forms is expressed. In recent years, multi-monitor video cameras from the same pop-up or more, such as history, structure expressed on a variety of video is required by express. The problem with these systems, video compression and transmission of many cameras, and this image data received from the server or PC to take out all the images you want to watch to occur when in order to express all of the images because of the need to decode most of the program per limit of number of channels is positioned. This limited number of channels to have a video that nothing forced, but it is likely to do so in the future performance of the hardware evolves gradually channeled images available number of channels will increase proportionately. However, as the development of hardware required for a single screen video channel will be more gradual capital. The hardware rather than relying solely on the performance of the decoded video data on the screen in order to express a more efficient utilization of shared memory for video surveillance software will provide the operating plan.

• 한국컴퓨터정보학회논문지
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• 제15권12호
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• pp.85-92
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• 2010

다자간 화상상담에서 회의 참여자의 인증을 위해 참여자의 ID와 패스워드를 대칭키로 암호화하여 전송하는 방식은 비밀키의 수가 많아지게 되어 암호화와 복호화를 위한 키의 관리가 어렵다는 것과, 제3자가 대칭키를 스니핑 할 수 있어서 화상상담의 보안성이 떨어지는 문제점이 있다. 본 논문에서는 화상상담에서 보안성을 높이기 위해, 첫째, 다수의 회의 참여자를 PKI 기반의 X.509 인증서로 인증하고, 둘째, 영상통신에서 참여자의 개인키를 교환하여 세션공유키로 만들고 세션공유키의 조합을 통해 키를 만들어 참여자가 바뀔 때마다 키를 갱신하였다. 셋째, 화상회의시 전송되는 미디어 데이터의 RTP 페이로드를 암호화하여 전송함으로써 보안성을 높였다.

• 전자공학회논문지T
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• 제36T권4호
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• pp.123-132
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• 1999

화상회의 시스템은 지리적으로 분산된 컴퓨터 사용자들이 회의 시스템을 공유함으로써 오디오 및 비디오 정보를 사용하여 회의에 참가할 수 있는 환경을 제공한다. 그러나, 기존의 화상회의 시스템은 전용시스템 도입을 필요로 하며, 시스템이 설치된 장소에서만 회의가 가능하므로 특정 플랫폼과 네트워크 환경에 사용자가 종속되는 문제점을 가지고 있다. 또한, 사용자들이 회의 참가자들의 네트워크 접속상황을 사전에 인지해야 하며, 반드시 동일한 종류의 회의 시스템 응용프로그램을 사용해야 하는 약점이 있다. 본 논문에서는 위와 같은 문제점을 해결하기 위해 웹 기반에서 운영되는 화상회의 시스템의 설계와 구현 방법에 관하여 논한다. 제안된 화상회의 회의 시스템은 회의시스템 응용이 서버에서 전송되어 웹 브라우저에서 수행되므로, 회의 참가자들은 웹 브라우저만으로 회의를 수행 할 수 있다. 회의 세션관리 및 회의 응용 도구, 멀티미디어 제어 및 전송도구는 웹 서버에서 전담하므로, 웹 서비스가 가능한 곳에서는 네트워크 접속 상황에 관계없이 화상회의가 가능하다. 웹 기반의 회의 시스템을 구현하는데 가장 중요한 과제인 회의 참가자간의 상호 작용과 지속적인 회의 세션 연결을 구현하기 위해 자바 기술을 사용하였으며, 오디오 및 비디오 제어 및 처리는 하드웨어 제어가 용이한 ActiveX 기술을 사용하였다.