• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.4-5
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• 2011

본 논문에서는 비대칭적 화질을 갖는 스테레오 3DTV 시스템에서 좌우 두 영상의 화질차이가 합성한 스테레오 3D 영상의 주관적 화질을 떨어뜨릴 정도로 현저한 경우, 이 화질 차이를 보상하기 위하여 조건부 대체를 포함한 양안시차 맵을 이용하는 방법을 제안한다. PSNR값 비교를 통하여 화질 개선 정도를 보았고 0.37~18dB 정도의 PSNR 개선을 확인하였다.

• Electronics and Telecommunications Trends
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• v.24 no.3
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• pp.61-68
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• 2009

UHDTV와 함께 HDTV 이후의 차세대 방송기술로서 전세계적으로 연구되고 있는 3DTV 방송 기술은 시청자에게 보다 사실적 이고 현장감 있는 3D 비디오 콘텐츠를 제공한다. 최근 미국 헐리우드를 중심으로 활성화되고 있는 3D 입체 영화 시장 성장, 다수의 디스플레이 업체들에 의한 3D 지원 디스플레이 발표, 휴대단말에서의 3D 데이터 및 비디오 서비스, 가정에서의 3D 비디오 서비스를 위한 3D@Home 표준화 작업, 3D4YOU를 중심으로 한 3D 비디오 콘텐츠의 생성기술과 배포 포맷에 관한 연구, 다시 점 3DTV 서비스 등을 위한 MPEG에서의 3DV 표준화 등 관련 기술 개발 및 표준화가 이뤄지고 있다. 본 고에서는 MPEG 3DV 그룹에서 진행중인 3DV부호화 기술 표준화 진행 현황과 기고 주요 기술에 대해 설명하고, 향후 3D 비디오 표준화 진행 전망에 대해 다루기로 한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.48 no.6
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• pp.35-47
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• 2011

A present experimental broadcasting is service compatible to delivery left view and right view of a dual stream for backward compatible with 2D device. It has a limitation of quality for a transmission of dual stream in terrestrial bandwidth 19 Mbps. This paper proposes adjunct terrestrial-3D broadcasting system which can provide a stable quality beyond a limitation of quality from fixed bandwidth. It proposes the system that composes a high quality stereoscopic video through synchronizing Real time broadcasting and Non Real Time broadcasting Regardless of the terrestrial bandwidth. So this paper tries to analyze each technique of Real-Time broadcasting and NRT broadcasting, and verify this proposal through the technique of an algorithm that we can implement NRT adjunct high quality 3DTV system and the experiments.

• Journal of the Korean Professional Engineers Association
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• v.43 no.3
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• pp.23-27
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• 2010

Since 3DTV was introduced, the market could not grow further due to the several causes such as the lack of content, technology for production and display and eyestrain. However, the rapid advances of the technologies on digital broadcasting, consumer electronics and computer enabled the commercialization of 3D animation, computer graphic, 3D advertising as well as 3D movies, and since then the international technical competition is growing fiercer. Since much more companies introduced the solutions for 3D in NAB 2010 than 2009, the expected size of the market will be bigger than ever before. This article describes the recent trends and the prospect of the 3D technologies including national defence strategy, content, construction, consumer electronics, advertisement, and terrestrial 3D1V pilot project in Korea.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.3
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• pp.17-24
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• 2013

In this paper, the measurement data is analyzed and channel characteristics are derived through MIMO Channel measurements at 781MHz considering antenna correlation. 781MHz frequency band currently operates the DTV system, however, it will be allocated new mobile communication frequency band. The channel characteristics at 781MHz seem to be similar existing mobile communication system at 900MHz but quite a different part of the existing research has demonstrated. In addition, the signal procedure of the channel characteristics, considering the correlation of the antenna, for a more accurate prediction research is needed. To avoid interference with Korean DTV broadcasting, we measured channel characteristics in urban areas of Jeju island by channel sounder and $4{\times}4$ antenna. Channel characteristics with antenna correlation were derived based on the measured data in the urban area.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.53-56
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• 2011

최근 3D 입체영상이 핫 이슈로 떠오르면서 관련 업계에서는 여세를 몰아 제품 개발이나 마케팅에 총력을 기울이고 있으며 방송, 영화, 게임 등에 접목하여 차세대 핵심 산업을 견인하고 있다. 특히, Post-HDTV 이후 3DTV 방송은 국내외 표준화 단체를 중심`으로 표준화 및 다양한 3DTV 실험방송 서비스가 활발히 진행되고 있다. 이를 반영하듯, 케이블 및 위성 매체기반의 상용 3DTV 방송이 서비스 중에 있으며 이를 점차 지상파에도 적용하기 위하여 각 지역 방송표준단체는 타 표준단체들과 공조를 통하여 표준화를 진행 중에 있다. 이에, 본 논문에서는 다양한 디지털방송 플랫폼에서 적용이 가능하며 종래의 디지털방송과 호환성을 유지하면서 3DTV 방송서비스를 제공하기 위한 시스템 및 시그널링 방식을 소개한다. 특히, 시그널링 부분은 지상파/케이블/위성 매체에서 스테레오스코픽 비디오를 서비스하기 위하여 공통적으로 적용되는 기술로서 국내에서는 TTA를 중심으로 현재 MPEG 국제 표준화에 참여 중에 있다.

• Journal of Broadcast Engineering
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• v.16 no.2
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• pp.216-225
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• 2011

Following the proliferation of three-dimensional video contents and displays, many terrestrial broadcasting companies have been preparing for stereoscopic 3DTV service. In terrestrial stereoscopic broadcast, it is a difficult task to code and transmit two video sequences while sustaining as high quality as 2DTV broadcast due to the limited bandwidth defined by the existing digital TV standards such as ATSC. Thus, a terrestrial 3DTV broadcasting with a heterogeneous video codec system, where the left image and right images are based on MPEG-2 and H.264/AVC, respectively, is considered in order to achieve both high quality broadcasting service and compatibility for the existing 2DTV viewers. Without significant change in the current terrestrial broadcasting systems, we propose a joint rate control scheme for stereoscopic 3DTV service based on the heterogeneous dual codec systems. The proposed joint rate control scheme applies to the MPEG-2 encoder a quadratic rate-quantization model which is adopted in the H.264/AVC. Then the controller is designed for the sum of the left and right bitstreams to meet the bandwidth requirement of broadcasting standards while the sum of image distortions is minimized by adjusting quantization parameter obtained from the proposed optimization scheme. Besides, we consider a condition on maintaining quality difference between the left and right images around a desired level in the optimization in order to mitigate negative effects on human visual system. Experimental results demonstrate that the proposed bit rate control scheme outperforms the rate control method where each video coding standard uses its own bit rate control algorithm independently in terms of the increase in PSNR by 2.02%, the decrease in the average absolute quality difference by 77.6% and the reduction in the variance of the quality difference by 74.38%.

• Journal of Digital Convergence
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• v.10 no.4
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• pp.1-9
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• 2012

Emerging three-dimensional television (3DTV) as a new IT product shows a possibility that television is not for just watching broadcasting, but an attractive tool for applying it to our real life. Three dimensional television is generally more effective and attractive than two-dimensional television (2DTV). But it still needs continuous technological improvement to solve its inherent limitations until many customers decide to purchase 3DTVs without hesitation. Innovative products like 3DTV encounter a quality problem leading purchase decision by customers. Quality is regarded as one of the most important factors affecting customers to adopt and use the product. Furthermore, measuring quality effectively is considerable for the 3DTV research. In this paper, we suggest the Analytic Hierarchy Process(AHP) method for evaluating 3DTVs in a view of quality. We describe quality criteria affecting the 3DTV selection through a literature survey and develope an analytical method for measuring quality. We classify the quality of 3DTV into four types and suggest a concept of the quality ratio as a measurement criteria instead of the quality gap. Though a numerical example, we show how priorities of 3DTV with versatile manufacturers is computed.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.10
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• pp.794-801
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• 2017

In this paper, we proposed airborne target recognition using multi-channel combining method in DTV-based passive radar. By combining multi-channel signals, we obtained the HRRP with sufficient range resolution. HRRP was obtained by AR method or zero-padding. From the obtained HRRP, we extracted scattering centers by CLEAN algorithm using the gradient descent. We extracted feature vectors and performed target recognition after training neural network using the extracted feature vectors. To verify performance of proposed methods, we assumed frequency bands of three broadcasting transmitters operated in Korea(Mt. Gwan-ak, Mt. Yong-moon, Kyeon-wol-ak) and used full scale 3D CAD model of four targets. Also we compared the target recognition performance of the proposed method with that of using only single-channel of three broadcasting transmitters. As a result, proposed methods showed better performance than using only single-channel at three broadcasting transmitters.

• ETRI Journal
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• v.29 no.3
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• pp.393-395
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• 2007

Analytic modeling and computational simulation for the protection of DTV from cognitive radio interference are performed. Protection is achieved by using the protection ratio, which is derived through system modeling and its analysis. On the frequency coordination between digital TV and cognitive radio, an analysis in a co-channel environment, in a rural area in Korea, is performed.