• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.185-186
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• 2015

본 논문에서는 플래시 비디오 파일을 이용하여 효율적인 다중화면 콘텐츠 제작을 제안한다. 플래시 라이브 비디오를 만들기 위하여 동영상 파일을 플래시 프로그램에 내장된 변환 프로그램을 사용하여 플래시 비디오 파일로 변환한다. 플래시 비디오 파일의 특성은 어떤 비디오 파일 포맷보다 보안성과 압축률이 높으면서 고화질을 제공하는 특성을 가지고 있다. 따라서 다중을 화면을 제작함으로써 어떤 다른 동영상 파일 포맷을 비교해 보면 보다 효율적인 우수함을 나타낸다.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.6
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• pp.545-552
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• 2016

As a future key industry, digital signage is being noticed that provides various type of contents and message through a digital display. In particular, korean digital signage industry gets a favorable evaluation for the high level of digital display industry and wired and wireless networking infrastructure. This paper discusses on not only the current status of digital signage in terms of the overall development and standardization, but the very recent technologies such as the ultra-high definition video and human perception that can be applied for future digital signage. Then, this paper concludes by deriving the problems with the current digital signage industry and presenting solutions for future vitalizations of digital signage.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.350-353
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• 2007

This paper presents an real-time implementation of H.264/AVC High 4:4:4 Predictive profile decoder using general-purpose processors by exploiting multi-threading technique and Single Instruction Multiple Data (SIMD) instructions without any quality degradation. We analyze differences between the existing High profile and High 4:4:4 Predictive profile decoder, and show various optimization techniques to decode high fidelity and high definition (HD) video in real-time. Simulation results show that the proposed decoder can play high fidelity HD video at average 40 frames per seconds (fps) for the IBBrBP bistream and about 50 fps for the Intra-only bitstream.

• The Journal of Korean Association of Computer Education
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• v.14 no.6
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• pp.83-89
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• 2011

In this study a smart HDMI switch is proposed to detect newly formed video stream and automatically change the transfer path to the corresponding port without pulling the HDMI plug and putting it again in the desired port manually and physically. Furthermore the proposed switch is designed in the advanced wireless video transmission scheme based on millimeter band technology. The proposed system shows its feasibility by the hardware experiment in the full-HD video transmission performance including the function of the smart port change.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.1B
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• pp.26-38
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• 2006

To construct seamless collaborative environments, what all participants intent should be delivered, and visual elements such gesture, facial expression, and ambiance should be shared with all participants. In this paper, we propose high-quality video service to support DV(digital video) and HDV(high-definition DV) based on Access Grid(AG) which is a prevalent collaborative system. The proposed service is designed for employing versatile media tools and codecs with SDP(session description protocol) and SAP(session announcement protocol). We also design network-adaptive video transmission module to mitigate the impact of network fluctuation. This periodically monitors multicast performance and controls frame rate on sender side considering network condition. The experimental results over the test bed show that proposed service enhances quality of AG video service and provides seamless high-quality video transport by mitigating the impact of network fluctuation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.1
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• pp.414-435
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• 2017

As network adaptive streaming technology becomes increasingly common, transport protocol also becomes important in guaranteeing the quality of multimedia streaming. At the same time, because of the appearance of high-quality video such as Ultra High Definition (UHD), preventing buffering as well as preserving high quality while deploying a streaming service becomes important. The Internet Engineering Task Force recently published Multipath TCP (MPTCP). MPTCP improves the maximum transmission rate by simultaneously transmitting data over different paths with multiple TCP subflows. However, MPTCP cannot preserve high quality, because the MPTCP subflows slowly increase the transmission rate, and upon detecting a packet loss, drastically halve the transmission rate. In this paper, we propose a new multipath congestion control scheme for high-quality multimedia streaming. The proposed scheme preserves high quality of video by adaptively adjusting the increasing parameter of subflows according to the network status. The proposed scheme also increases network efficiency by providing load balancing and stability, and by supporting fairness with single-flow congestion control schemes.

• Journal of Korean Neurosurgical Society
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• v.60 no.3
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• pp.289-293
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• 2017

An exoscope, high-definition video telescope operating monitor system to perform microsurgery has recently been proposed an alternative to the operating microscope. It enables surgeons to complete the operation assistance by visualizing magnified images on a display. The strong points of exoscope are the wide field of view and deep focus. It minimized the need for repositioning and refocusing during the procedure. On the other hand, limitation of magnifying object was an emphasizing weak point. The procedures are performed under 2D motion images with a visual perception through dynamic cue and stereoscopically viewing corresponding to the motion parallax. Nevertheless, stereopsis is required to improve hand and eye coordination for high precision works. Consequently novel 3D high-definition operating scopes with various mechanical designs have been developed according to recent high-tech innovations in a digital surgical technology. It will set the stage for the next generation in digital image based neurosurgery.

• Broadcasting and Media Magazine
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• v.21 no.1
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• pp.59-69
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• 2016

2013년 1월에 완성된 HEVC (High Efficiency Video Coding) 표준은 full HD (High Definition) 해상도를 뛰어넘는 UHD (Ultra High Definition) 초고해상도 영상 서비스 수요를 반영하였으며, 기존의 H.264/AVC 대비 두 배 이상의 압축 성능을 달성하였다. 이러한 초고해상도 영상 서비스와 더불어 현실과 유사한 고명함도 (HDR : High Dynamic Range) 및 광색역 (WCG : Wide Color Gamut) 영상에 대한 수요 또한 증가하고 있다. 이러한 시장의 수요를 반영하여, HDR/WCG와 관련된 국제 표준 단체들에서는 활발한 표준화를 진행하고 있다. 본 고에서는 MPEG에서 진행되는 HDR/WCG 영상의 표준 기술동향에 대해 살펴보고, HDR/WCG 영상의 부호화 효율에 영향을 미치는 기술적 이슈들에 대해 소개한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1189-1198
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• 2015

Recently, with rapid development of digital broadcasting technology, high-definition video service increased interest and demand. supplied mobile and image device support that improve 4~16 time existing Full HD. Such as high-definition contents supply, proposed compression for high-efficiency video codec (HEVC). Therefore, watermarking technology is necessary applying HEVC for protecting ownership and intellectual property. In this paper, analysis of prediction mode in intra frame and study feasibility of watermarking in re-encoding based HEVC. Proposed detect un-changed blocks in intra frame, using the result of analysis prediction mode.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.10B
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• pp.919-927
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• 2008

The growing availability of broadband multimedia applications are providing strict real-time services and enabling users to feel much interactivity as well as 'sense of presence'. In that sense, there would be increased demand for what network and system have to do to fulfill the user expectations. In this paper, we implement a real-time multimedia application which make use of real-time DXT CODEC and investigate what the challenges of networking and system are. We carry out various experiments over a research network test-bed to evaluate the performance of our proposals.