• 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.

• 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%.

• Broadcasting and Media Magazine
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• v.5 no.4
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• pp.4-7
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• 2000

• Broadcasting and Media Magazine
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• v.4 no.1
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• pp.27-34
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• 1999

• Journal of Broadcast Engineering
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• v.17 no.2
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• pp.237-251
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• 2012

Recently, the direct terrestrial broadcasting reception has been reduced rapidly and not been improved even in digital broadcast environment. The distribution plan of 700MHz frequency band(Ch.52~69) will make the problem worse because the spectrum might be allocated to mobile communication use. In this paper, we investigated the efficient frequency usage for DTV signal reception improvement and next generation broadcasting. The frequency amount required for reception improvement and for next generation broadcasting service is presented. We estimated the beneficial effect when the spectrum(108MHz Frequency Width) is used for SFN transmission technology, UHDTV and Full-HD 3DTV.

• Journal of Broadcast Engineering
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• v.15 no.6
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• pp.830-844
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• 2010

In this paper, we propose an equalization digital on-channel repeater (EDOCR) with a feedback interference canceller (FIC) for single frequency network of the ATSC terrestrial DTV system. The proposed EDOCR with FIC does not have only high output power by cancelling feedback signals caused by insufficient antenna isolation through the FIC, but also shows better quality of output signals than the conventional on-channel repeaters (OCRs) by removing multipath signals existing between the main transmitter and the OCR, and residual feedback signals through an equalizer. In addition, computer simulations are provided to figure out the superior performance of the proposed EDOCR with FIC.

• 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.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.93-96
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• 2013

증강방송(Augmented Broadcasting)은 최근 스마트 기기의 보급으로 인해 대중적으로 알려진 증강현실(Augmented Reality) 서비스를 스마트 TV 와 같은 하이브리드 방송 환경에 접목하여, 시청자에게 기존에 느낄 수 없었던 TV 시청에 대한 몰입감과 콘텐츠 조작의 양방향성을 제공하고자 하는 새로운 방송통신 융합 서비스 개념이다. 증강방송에 대한 개념과 PC 기반의 테스트베드 시스템은 이미 다수 발표되었으며, 본 논문에서는 디지털 지상파 방송 환경에서의 증강방송 시스템 실현을 위해 DTV 기반의 증강방송 시그널링과 콘텐츠 동기화 방안을 적용한 재다중화기(Re-multiplexer)의 설계 및 구현에 관해 설명한다.

• Journal of Multimedia Information System
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• v.4 no.1
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• pp.19-26
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• 2017

The compression of video for both full HD and UHD requires the inclusion of extra vertical lines to every video frame, named as the DTV essential hidden area (DEHA), for the effective functioning of the MPEG-2/4/H encoder, stream, and decoder. However, while the encoding/decoding process is dependent on the DEHA, the DEHA is conventionally viewed as a redundancy in terms of channel utilization or storage efficiency. This paper proposes a block mode DEHA method to more effectively utilize the DEHA. Partitioning video block images and then evenly filling the representative DEHA macroblocks with the average DC coefficient of the active video macroblock can minimize the amount of DEHA data entering the compressed video stream. Theoretically, this process results in smaller DEHA data entering the video stream. Experimental testing of the proposed block mode DEHA method revealed a slight improvement in the quality of the active video. Outside of this technological improvement to video quality, the attractiveness of the proposed DEHA method is also heightened by the ease that it can be implemented with existing video encoders.

• 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.