• Journal of Broadcast Engineering
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• v.18 no.4
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• pp.572-588
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• 2013

In this paper, 4K-UHDTV or 8K-UHDTV and UHD-3DTV that the next generation broadcasting implementation and the possibility of direct receiving environment construction is analyzed on the terrestrial broadcasting. Particularly, we investigated the possibility by analyzing the previous and related works with regard to UHDTV transmission by DVB-T2 that is one of the best commercialized transmission mode. In order that the UHDTV broadcasting succeeds once again after completion of digital terrestrial switch over at the end of 2012, the ultra high resolution image transfer is important. However, the direct, the indoor and ubiquitous receiving environment is important in not only TV but also the personal type multimedia terminal in the sense of UHDTV service penetration. Therefore, in this paper, by using SFN and high error-correcting mode in DVB-T2 standard, the efficient frequency utilization and effective reception environment construction is illustrated. Particularly, SFN network constitution by 2 mutually different frequencies including the VHF bandwidth and UHF band, and etc. is shown. And the method that builds the free wireless receive environment by using SFN low power radio repeater and for home use gap filler is proposed. And the effect and frequency amount required are presented, when UHDTV broadcasting use 10MHz bandwidth.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.47 no.6
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• pp.28-38
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• 2010

In order to remove the noise contained in recorded analog video, it is important to recognize the real characteristics and strength of the noise. This paper presents an efficient training-based noise reduction method for recorded analog video after analyzing the noise characteristics of analog video captured in a real broadcasting system. First we show that there is non-negligible noise correlation in recorded analog video and describe the limitations of the traditional noise estimation and reduction methods based on additive white Gaussian noise (AWGN) model. In addition, we show that auto-regressive (AR) model considering noise correlation can be successfully utilized to estimate and synthesize the noise contained in the recorded analog video, and the estimated AR parameters are utilized in the training-based noise reduction scheme to reduce the video noise. Experiment results show that the proposed method can be efficiently applied for noise reduction of recorded analog video with non-negligible noise correlation.

• Journal of Broadcast Engineering
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• v.9 no.3
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• pp.214-224
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• 2004

In this paper, an adaptive spatio-temporal predictive coding based on the H.264 is proposed for 3D immersive media encoding, such as 3D image processing, 3DTV, and 3D videoconferencing. First, we propose a spatio-temporal predictive coding using the same view and inter-view images for the two TPPP, IBBP GOP (group of picture) structures 4hat are different from the conventional simulcast method. Second, an 2D inter-view direct mode for the efficient prediction is proposed when the proposed spatio-temporal prediction uses the IBBP structure. The 2D inter-view direct mode is applied when the temporal direct mode in B(hi-Predictive) picture of the H.264 refers to an inter-view image, since the current temporal direct mode in the H.264 standard could no: be applied to the inter-view image. The proposed method is compared to the conventional simulcast method in terms of PSNR (peak signal to noise ratio) for the various 3D test video sequences. The proposed method shows better PSNR results than the conventional simulcast mode.

• Journal of Broadcast Engineering
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• v.14 no.5
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• pp.601-615
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• 2009

This paper proposes an efficient depth-map coding method for generating virtual-view images in 3D-Video. Virtual-view images can be generated by the view-interpolation based on the depth-map of the image. A conventional video coding method such as H.264 has been used. However, a conventional video coding method does not consider the image characteristics of the depth-map. Therefore, this paper proposes an adaptive depth-map coding method that can select between the H.264/AVC coding scheme and the proposed gray-coded bit plane-based coding scheme in a unit of block. This improves the coding efficiency of the depth-map data. Simulation results show that the proposed method, in comparison with the H.264/AVC coding scheme, improves the average BD-rate savings by 7.43% and the average BD-PSNR gains by 0.5dB. It also improves the subjective picture quality of synthesized virtual-view images using decoded depth-maps.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.208-211
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• 2010

2012년 지상파 방송은 아날로그 송출을 종료하고 디지털 방송으로 전환된다. 이렇게 전환되는 지상파 디지털 방송은 무료로 누구나 시청할 수 있는 보편적 서비스를 지향하기 때문에, 케이블TV, 위성TV, IPTV 등의 다른 매체와는 달리 기술적 보호조치 없이 방송되고 있다. 또한 DTV 방송프로그램은 원본과 똑같은 화질로 개인이 쉽게 저장할 수 있고 인터넷을 통하여 누구나 쉽게 접근이 가능하기 때문에, DTV 방송프로그램의 무단복제와 인터넷을 통한 불법재배포는 큰 문제점으로 대두되고 있다. 이러한 불법 대량배포는 방송프로그램의 저작권을 심각히 침해할 뿐만 아니라, 방송사의 고품질의 방송프로그램을 제작환경을 더욱 열악하게 만들고 있다. 또한 일반 사용자는 인식하지 못하는 사이에 인터넷을 통해 불법 콘텐츠를 사용하게 되는 악순환에 빠지게 된다. 이에 본 논문은 KBS에서 추진하고 있는 여러 콘텐츠 보호 기술들을 하나의 보호 고리로 연결하는 KBS 보호기술 체계를 소개하고자 한다. 이를 위하여 KBS는 아래의 3가지 보호 기술을 개발하여 체계적으로 연결하여 적용하고 있다. 첫째, 프로그램의 저작권과 배포 정보를 나타내는 프로그램 보호신호(PPI, Program Protection Information)와 워터마크를 방송 신호에 삽입하여 수신기에서의 프로그램 보호를 추진한다, 둘째, 인터넷 OSP(Online Service Provider)와의 제휴를 통하여 콘텐츠 필터링 기술을 도입하여 프로그램 불법 업로드, 다운로드를 방지한다. 셋째, KBS 저작물 인터넷 모니터링 시스템을 개발하여 인터넷 상의 불법 프로그램 배포정보를 획득하여 불법배포가 진행되는 사이트에 보호를 요청한다.

• Journal of Broadcast Engineering
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• v.14 no.2
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• pp.164-177
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• 2009

The DIBR(depth image-based rendering) method gives the sense of depth to viewers by using one color image and corresponding depth image. At this time, the qualities of the generated left- and right-image depend on the baseline distance of the virtual cameras corresponding to the view of the generated left- and right-image. In this paper, we present a novel method for enhancing the sense of depth by adjusting baseline distance of virtual cameras. Geometric analysis shows that the sense of depth is better in accordance with the increasing disparity due to the reduction of the image distortion. However, the entailed image degradation is not considered. Experimental results show that there is maximum bound in the disparity increasement due to image degradation and the visual field. Since the image degradation is reduced for increasing that bound, we add a depth map preprocessing. Since the interactive service where the disparity and view position are controlled by viewers can also be provided, the proposed method can be applied to the mobile broadcasting system such as DMB as well as 3DTV system.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.5
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• pp.117-124
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• 2004

Various multimedia systems have been developed and their application areas widely proliferate. Thus, the interoperability is getting important among various networks and devices. The video transcoding is a technology to solve this interoperability problem among various coding standards. Transcoding can be defined as the conversion of one compressed coded data to another. In this paper, MPEG-2 to MPEG-4 transcoder in the spatial domain is compared with that in the DCT domain. The transcoder is very useful when a video sequence that is originally encoded for digital TV, DVD or satellite broadcasting is served in mobile environment. In order to compare two transcoders, all modules except motion compensation and down sampling are implemented identically. In addition, both transcoders do not search for motion vector. Instead, the decoded information is reused to the encoder. The experimental results show that the transcoder in the spatial domain is usually better than that in the DCT domain with respect to PSNR (Peak Signal-to-Noise Ratio), bitrate and execution time.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.1
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• pp.23-30
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• 2010

The H.264/AVC is increasingly used in broadcast video applications such as Internet Protocol television (IPTV), digital multimedia broadcasting (DMB) because of high compression performance. But the H.264/AVC coded video can be delivered to the widespread end-user equipment for MPEG-2 after transcoding between this video standards. This paper suggests a new transcoding algorithm for H.264/AVC to MPEG-2 transcoder that uses motion vector clustering in order to reduce the complexity without loss of video quality. The proposed method is exploiting the motion information gathered during h.264 decoding stage. To reduce the search space for the MPEG-2 motion estimation, the predictive motion vector is selected with a least distortion of the candidated motion vectors. These candidate motion vectors are considering the correlation of direction and distance of motion vectors of variable blocks in H.264/AVC. And then the best predictive motion vector is refined with full-search in ${\pm}2$ pixel search area. Compared with a cascaded decoder-encoder, the proposed transcoder achieves computational complexity savings up to 64% with a similar PSNR at the constant bitrate(CBR).

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.487-487
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• 2012

플라즈마 디스플레이 패널(PDP)은 공정 절차가 간단하고 가격 경쟁력이 매우 뛰어나 일찌감치 대형 평판 디스플레이 시장을 주도해 왔으며 빠른 응답 속도를 기반으로 한 생생한 화질의 구현으로 3D TV 시장에서도 꾸준한 사랑을 받고 있다. 향후 더 큰 화면을 요구하는 PID(Public Information Display) 시장에서도 PDP 는 두각을 나타낼 수 있을 것으로 보인다. 하지만 PDP 는 여전히 LCD, OLED 등의 디스플레이에 비해 발광 효율이 낮고 소비 전력이 높다는 단점을 가지고 있다. 또한 미국 환경청(EPA)과 에너지부(DOE)가 공동으로 마련한 전자 제품의 효율 등급제인 에너지 스타(Energy Star) 제도가 끊임없이 개편되면서 소비 전력에 대한 규제가 점차 강화되고 있기 때문에 발광 효율 및 소비 전력 특성의 개선은 현재 PDP 업계가 해결해야 할 가장 중요한 과제라고 할 수 있다. 발광 효율의 개선과 관련하여 최근에는 PDP의 보호막으로 널리 쓰이고 있는 MgO 보다 2차 전자 방출 계수가 높아 PDP의 구동 전압을 낮추는 동시에 휘도와 발광 효율 특성을 개선시킬 수 있는 신 보호막에 대한 연구가 활발히 이루어지고 있다. MgO를 대체 가능한 신 보호막으로 언급되는 물질은 SrO 혹은 CaO 등이 대표적이다. 하지만 이러한 물질들은 공기 및 수분에 대한 용해도가 높기 때문에 증착된 막이 이후의 공정 과정(합착 및 가열 배기 등)에서 대기 중에 노출 될 경우 심하게 변질될 수 있다. 이러한 문제점을 해결하기 위해서 신 보호막 위에 기존의 MgO 보호막을 얇게 증착하여 공기로부터의 접촉을 차단하거나 펠렛을 제조하는 과정에서 MgO 에 신 보호막 물질을 소량만 첨가하는 등의 방법들이 제안되어 왔으며 그 결과 기존의 PDP 대비 구동 전압을 낮추고 발광 효율을 획기적으로 개선하는데 성공한 결과들이 지속적으로 보고되고 있다. 하지만 신 보호막이 공기 및 수분에 민감한 만큼, 고온의 공정으로 인해 PDP의 하판 유리로부터 상판에 증착된 박막으로 확산되는 불순물에 의해서도 오염되며 이 역시 신 보호막의 특성을 구현하는데 방해 요소로 작용한다. 본 연구에서는 PDP 하판의 불순물이 상판의 박막으로 확산되는 것을 방지하고자 하판 형광체 인쇄전 PECVD 증착법으로 확산 방지막을 1 가량 형성하였다. 이후 SIMS 분석을 통하여 하판 불순물의 확산이 효과적으로 차단됨을 확인하였고 신 보호막의 오염을 최소화하여 결과적으로 PDP의 구동 전압을 낮추고 효율을 획기적으로 개선하는데 기여할 수 있음을 확인하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.572-575
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• 2009

With the advent of integration environment of broadcasting and communication, IPTV has been widely used. It provides services such as information, movie contents and broadcasting through TV using super-high speed networks. Developments of Wireless LAN and IP network technology create various and fusional services such as IPTV, VoIP that are based on IP network. The development of Wireless LAN is very important in IPTV network field which requires the best quality of service on the security, QoS and bandwidth. In this Paper, We configure the experimental network in its RIP and OSPF environment to test the Video Quality of IPTV in Wireless LAN. We measure and evaluate broadcasting quality by using PSNR to show the corelation of Routing Protocols in Wireless LAN in which how they affect to the IPTV real-time Video Quality.