• The Journal of the Korea Contents Association
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• v.9 no.9
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• pp.51-59
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• 2009

A watermarking for copyright protection of digital contents for broadcasting have to be made for a real-time system. In this paper, we propose a real-time video watermarking system which is hardware-based watermarking system of SD/HD (standard definition/high definition) video with the STRATIX FPGA device from ALTERA. There was little visual artifact due to watermarking in subjective quality evaluation between the original video and the watermarked one in our experiment. Embedded watermark was extracted after robustness testscalled natural video attacks such as A/D (analog/digital) conversion. Our implemented watermarking hardware system can be useful in movie production and broadcasting companies that requires real-time contents protection systems.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.129-130
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• 2014

최근 높은 품질의 비디오 서비스에 대한 사용자 요구 증가로 UHD(Ultra High-Definition) 서비스가 등장하였고 여러 방송사에서 UHD 서비스를 제공하기 위해 노력하고 있다. 하지만 아날로그에서 디지털로의 전환이 이루어진지 얼마 지나지 않았고 사용자 대부분은 HD(High-Definition)급 수상기를 가지고 있기 때문에 현재로서는 HD 서비스와 UHD 서비스가 공존해야 하는 상황에 있다. 이를 위해 스케일러블 영상 기술과 차세대 멀티미디어 다중화 전송 표준인 MMT(MPEG Media Transport)가 대두되었다. 사용자 인터페이스로 정의된 MMT CI(Composition Information)를 이용해 계층 부호화 비디오 서비스하려고 하지만 계층 간의 의존성이 높기 때문에 구현상에 어려움이 있다. 이러한 문제점을 해결하기위한 방법으로 본 논문에서는 사용자가 계층 부호화된 비디오 서비스를 제공 받을 수 있는 독립적인 사용자 인터페이스 설계 기법을 제안한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.484-485
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• 2015

세계적인 디지털 방송 전환과 더불어 방송 기술의 비약적인 발전은 HD(High Definition) 방송 시대를 넘어 UHD(Ultra High Definition) 방송 시대를 개막하였으며, UHD를 비롯한 다양한 차세대 방송 기술들이 개발되고 있다. 이러한 변화에 따라 차세대 방송 기술의 선점을 위한 유럽의 DVB 2.0, 미국의 ATSC 3.0, 일본의 ISDB-Tmm과 같은 최신의 방송 표준이 제정되 거나 제정을 준비하고 있다. 국내의 차세대 방송 원천 기술에 대한 연구 개발이 어느 때보다도 시급한 상황이다. 본 논문은 방송 통신 융합환경 하에서 초고화질 콘텐츠를 전송할 수 있도록 하는 차세대 융합방송 프로젝트의 일환으로 유럽의 차세대 디지털 방송 시스템에 적용된 MPLP 기법을 분석하고, 해당 기법을 적용하여 지상파 방송망을 통해서 HD 및 4K UHD 서비스를 다중화하여 변조시스템에 전송하는 다중화 시스템의 구조를 제안한다.

• Broadcasting and Media Magazine
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• v.18 no.2
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• pp.27-38
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• 2013

디지털방송 기술의 발전으로 HD(High Definition) 방송이 보편화 되었고 디스플레이의 크기가 대형화 되면서 실감형 방송서비스에 대한 요구가 확산되고 있다. HD방송 이후의 실감형 서비스로는 UHD(Ultra High Definition) 방송이 가장 현실적인 서비스로 주목받고 있다. UHD 콘텐츠를 제작하고 전송하는 기술이 이미 시장에서 성숙단계에 있으며, UHDTV 관련 제품도 시장에 등장하고 있어 이러한 전망의 근거가 되고 있다. UHDTV 서비스에 대한 이러한 밝은 전망들 때문에 국내외 여러 방송사들은 실험방송을 하거나 준비하고 있다. 본 고에서는 CJ헬로비전이 케이블 기반으로 서비스하고 있는 UHD 실험방송의 내용에 대해서 알아본다. 실험방송에서는 세계 최초로 채널본딩 기술이 적용되어 전송용량을 확대할 수 있는 기반을 마련하였다.

• Broadcasting and Media Magazine
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• v.4 no.4
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• pp.46-51
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• 1999

The introduction of broadcast digital television (DTV) was, at one time, seen as an opportunity to rationalise video formats. The reality is quite different with a rapid divergence as the united States' ATSC offers 18 formats to cover both standard definition (SD) and high definition (HD), and yet more are supported by Europe's DVB. At the same time multi-media is expanding both as an area for source material and for finished work. Post production needs to move away from single-format facilities as requirements for multi-format operation is already increasing. A 'format-independent' solution is described which allows efficient operation with any mix of input formats and able to output any format with high quality. Attention is given to retaining the speed, accuracy and immediacy which is a feature of today's professional facilities -even while handling the greater demands of HD. Another route, using 24 frames-per-second is also examined.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.211-216
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• 2009

As demands for high-definition television (HDTV) increase, the implementation of real-time decoding of high-definition (HD) video becomes an important issue. The data size for HD video is so large that real-time processing of the data is difficult to implement, especially with software. In order to implement a fast moving picture expert group-2 decoder for HDTV, we compose five scenarios that use parallel processing techniques such as data decomposition, task decomposition, and pipelining. Assuming the multi digital signal processor environments, we analyze each scenario in three aspects: decoding speed, L1 memory size, and bandwidth. By comparing the scenarios, we decide the most suitable cases for different situations. We simulate the scenarios in the dual-core and dual-central processing unit environment by using OpenMP and analyze the simulation results.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.2
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• pp.240-246
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• 2008

It has able to be possible that expression and store visual image from analog to digital without picture quality damaged via improvement of video compression technology. And also, It is possible to broadcasting digital image via transmission of digital image on MPEG-2 standardization. For this reason, the broadcasting business owners have converted broadcasting service from analog to digital. But, local SO(System Operator) has a difficult point which secure HD(High Definition) broadcasting program. In this paper, we designed and implemented Scheduling System for MPEG-2 Digital Broadcasting which gather HD broadcasting program from major broadcasting business owners and broadcast them.

• Clinical Endoscopy
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• v.56 no.5
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• pp.563-577
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• 2023

In inflammatory bowel disease (IBD), chronic inflammation leads to unfavorable clinical outcomes and increases the risk of developing colorectal neoplasm (CRN); thereby highlighting the importance of endoscopically evaluating disease activity as well as detecting and characterizing CRN in patients with IBD. With recent advances in image-enhanced endoscopic (IEE) technologies, especially virtual chromoendoscopy (VCE) platforms, this review discusses state-of-the-art IEE techniques and their applicability in assessing disease activity and surveillance colonoscopy in patients with IBD. Among various IEE, VCE demonstrated the capacity to identify quiescent disease activity. And endoscopic remission defined by the new scoring system using VCE platform better predicted clinical outcomes, which may benefit the tailoring of therapeutic strategies in patients with IBD. High-definition dye-chromoendoscopy (HD-DCE) is numerically superior to high-definition white light endoscopy (HD-WLE) in detecting CRN in IBD; however, discrepancy is observed in the statistical significance. VCE showed comparable performance in detecting dysplasia to HD-WLE or DCE and potential for optical diagnosis to differentiate neoplastic from nonneoplastic lesions during surveillance colonoscopy. Applying these novel advanced IEE technologies would provide opportunities for personalized medicine in IBD and optimal treatment of CRN in patients with IBD.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.8
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• pp.1790-1802
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• 1997

A wavelet transform coding method that fulfills the requirements of HD-VCR(high definition video casstte recorder) for studio applications in proposed. A constant bit rate is achieved by a forward rate control technique whcih determins the quantizer stepsize based on the coding results fo the previous frame. We also propose a two-level coder that consists of both the IDC(independently decodable code) and the DDC(dependently decodable code). To minimize error propagation, the transformed coefficients are restructured into transform blocks which are represented by a tree structure. The result shows thta the proposed coding scheme produces better picture quality with block effects than that of DCT(discrete cosine transform) based coding schemes at the same compression ratio. The proposed method meets most of the requirements of HD-VCR.

• ETRI Journal
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• v.34 no.1
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• pp.122-125
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• 2012

A video signal through a high-density optical link has been demonstrated to show the reliability of optical link for high-data-rate transmission. To reduce optical point-to-point links, an electrical link has been utilized for control and clock signaling. The latency and flicker with background noise occurred during the transferring of data across the optical link due to electrical-to-optical with optical-to-electrical conversions. The proposed synchronization technology combined with a flicker and denoising algorithm has given good results and can be applied in high-definition serial data interface (HD-SDI), ultra-HD-SDI, and HD multimedia interface transmission system applications.