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IEEE International Symposium on Intelligent Signal Processing and communication Systems (ISPACS)

作者： Jinsoo Bae Hyoungmoon Kwon Sang Won Choi Sun Yong Kim S.R. Park S. Yoon I. Songl Department of Information and Communication Engineering Sejong University Seoul Korea Department of Electrical Engineering and Computer Science KAIST Daejeon Korea Department of Electronics Engineering Konkuk University Seoul Korea School of Information Communications and Electronics Engineering Catholic University of Korea Bucheon Korea School of lnformation and Communication Engineering Sungkyunkwan University Suwon Korea

In this paper, correlation coefficients between the sign and rank, sign and magnitude rank, and rank and magnitude rank of an observation in independent and identically distributed random vectors are obtained. It is shown that the sign, rank, and magnitude rank of an observation may or may not be uncorrelated depending on the distribution of the observation. Specifically, the correlation between the sign and magnitude rank and that between the rank and magnitude rank of an observation are zero for even symmetric distribution, and the correlation between the sign and rank of an observation is always nonnegative.

关键词： Signal detection Statistics Statistical distributions Detectors Signal processing Random variables Sun computer science Robustness Degradation

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A distortion control scheme for allocating constant distortion in FD-CD video transcoder

A distortion control scheme for allocating constant distorti...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Jin-soo Kim Jae-Gon Kim Kyeong-Ok Kang Jinwoong Kim Division of Information Communication and Computer Engineering Broadcasting Media Research Group Electronics and Telecommunications Research Institute Hanbat National University South Korea

ISBN: (纸本)0780386035

Recently, FD (frame dropping)-CD (coefficient dropping) transcoding has been considered, mainly due to the low computational complexity and simple implementation. However, CD errors in the FD-CD transcoding scheme tend to be propagated and they have a significant effect on the qualities of decoded images. We derive the error characteristics incurred by CD operations and propose an effective estimation model that adaptively describes well the characteristics of propagation errors in the compressed domain. Furthermore, we apply the proposed model to distortion control achieving nearly constant distortion allocation among frames. Simulations show that the proposed model is quite accurate in estimating the overall distortions and is effectively applied to distortion control over a range of sequences with varying scene types.

关键词： Discrete cosine transforms Decoding Transcoding Telecommunication computing Error analysis Lagrangian functions communication system control Telecommunication control Multimedia communication Broadcasting

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A new partitioning algorithm for considering paging load distribution in mobile communication systems

A new partitioning algorithm for considering paging load dis...

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IEEE Conference on Vehicular Technology (VTC)

作者： Dong-Jun Lee HyeJeong Lee Dong-Ho Cho Mobile Development Team Telecommunication Systems Division Information & Communication Business Samsung Electronics Company Limited South Korea Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology South Korea

ISBN: (纸本)0780382552

When the cells in a location area are paged sequentially, based on specific information, such as last registered area or mobile speed, the paging load may be non-uniformly distributed among the cells. This non-uniform paging traffic causes additional paging delay due to the increasing waiting time in cells that have a high paging load. We introduce a new partitioning strategy in which the paging sequence in a location area is optimized according to both the location probability of a mobile terminal and the paging load distribution among the cells. Numerical results show that our proposed strategy performs almost equivalently to the optimal one and outperforms the conventional paging scheme with respect to paging delay.

关键词： Partitioning algorithms Mobile communication Paging strategies Probability distribution Quality of service Mobile computing Business communication computer science Added delay Delay effects

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Implementation of the 3-View MPEG-2 encoder/decoder using the fastimage 1300 board

Implementation of the 3-View MPEG-2 encoder/decoder using th...

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Proceedings of 2004 International Symposium on Intelligent Signal Processing and communication Systems, ISPACS 2004

作者： Kim, Sung-Hyun Kim, Byung-Chan Park, Rae-Hong Kim, Je Woo Choi, Byeong Ho Jung, Hyeok Koo Department of Electronic Engineering Sogang Univ. C.P.O. Box 1142 Seoul 100-611 Korea Republic of Digital Media Research Center Korea Electronics Technology Institute Good Friend Bank B/D 270-2 SeoHyun-Dong Sungnam-Si KyungGi-Do 463-771 Korea Republic of School of Information Communication and Computer Engineering Hanbat National University Deokmyung-dong Yuseong-gu Daejeon 305-719 Korea Republic of

ISBN: (纸本)0780386396

This paper presents an implementation of the 3-view moving picture experts group-2 (MPEG-2) encoder/decoder using the FastImage 1300 board with four Trimedia 1300 processors. First of all, we convert MPEG-2 algorithms into a Trimedia streaming software architecture (TSSA) for real-time implementation. For motion estimation, 32-bit DSP operations are used with two processors in parallel, with one processor performing encoding and decoding. To share data between processors for disparity estimation, we employ a semaphore (for synchronization), queue, and direct memory access (DMA). Experiments show that with DSP board environment the processing times of the implemented 3-view encoder and decoder are reduced by a factor of five and three, respectively, in comparison with PC environment. © 2004 IEEE.

关键词： Decoding

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Implementation of the 3-view MPEG-2 encoder/decoder using the FastImage 1300 board

Implementation of the 3-view MPEG-2 encoder/decoder using th...

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IEEE International Symposium on Intelligent Signal Processing and communication Systems (ISPACS)

作者： Sung-Hyun Kim Byung-Chan Kim Rae-Hong Park Je Woo Kim Byeong Ho Choi Hyeok Koo Jung Department of Electronic Engineering Sogang University Seoul South Korea Digital Media Research Center Korea Electronics and Technology Institute Sungnam Gyeonggi South Korea School of Information Communication and Computer Engineering Hanbat National University Daejeon South Korea

ISBN: (纸本)0780386396

This paper presents an implementation of the 3-view moving picture experts group-2 (MPEG-2) encoder/decoder using the FastImage 1300 board with four Trimedia 1300 processors. First of all, we convert MPEG-2 algorithms into a Trimedia streaming software architecture (TSSA) for real-time implementation. For motion estimation, 32-bit DSP operations are used with two processors in parallel, with one processor performing encoding and decoding. To share data between processors for disparity estimation, we employ a semaphore (for synchronization), queue, and direct memory access (DMA). Experiments show that with the DSP board environment, the processing times of the implemented 3-view encoder and decoder are reduced by a factor of five and three, respectively, in comparison with the PC environment.

关键词： Decoding Image coding Video compression Transform coding Layout Software algorithms Software architecture Motion estimation Digital signal processing Humans

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Video cataloging system for real-time scene change detection of news video

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3322卷 705-715页

作者： Lee, Wanjoo Kim, Hyoki Kang, Hyunchul Lee, Jinsung Kim, Yongkyu Jeon, Seokhee Division of Computer and Information Yongln University Samga-Dong 470 Yong-In Gyunggi-Do 449-714 Korea Republic of Dept. of Information and Telecommunication Engineering University of Inchoen Dowha-Dong Nam-Gu Inchoen 402-749 Korea Republic of Hee-Jung B/D 4F Banpo-4Dong 49-11 Seocho-gu Seoul 137-044 Korea Republic of Dept. of Information Communication Engineering Sungkyul University Anyang 8-Dong Anyang 430-742 Gyunggi-Do Korea Republic of Dept. of Electronics Engineering University of Incheon Dowha-2Dong Nam-Gu Incheon 402-749 Korea Republic of

It is necessary for various multimedia database applications to develop efficient and fast storage, indexing, browsing, and retrieval of video. We make a cataloging system, which has important information of video data. In this paper, we proposed a method to process huge amount of broadcasting data. It can detect scene-change quickly and effectively for MPEG stream. To extract the DC-image, minimal decoding is employed form MPEG-1 compressed domain. Scene-change is detected by the modified histogram comparative method that combines luminance and color component. A neural network is used to judge whether it is scene-change with an anchorperson and to raise precision of an anchorperson scene extraction. © Springer-Verlag 2004.

关键词： Motion Picture Experts Group standards

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Artistic image technology

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Kyokai Joho Imeji Zasshi/Journal of the Institute of Image information and Television Engineers 2004年第8期58卷 1113-1118页

作者： Kosugi, Makoto Hayashi, Masaki Yata, Hirohiko Sinya, Mikio Oguro, Hisashi Yoshikawa, Hiroshi Comp. Science and Media Engineering Musashi Institute of Technology Tokyo Japan Multimedia Services NHK Sci. and Tech. Res. Laboratories Tokyo Japan Imaging Art Tokyo Polytechnic University Tokyo Japan Information Science Toho University Chiba Japan R and D Dept. Info-Communication Business Dev. Toppan Printing Co. Ltd. Tokyo Japan Electronics and Computer Science Nihon University Chiba Japan

No abstract available

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Performance comparison of space-time codes. and channel estimation in OFDM systems with transmit diversity for wireless LANs 9

Performance comparison of space-time codes. and channel esti...

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9th Asia-Pacific Conference on communications held in conjunction with the 6th Malaysia International Conference on communications (MICC 2003)

作者： Lee, SM Lee, DH Choi, HJ Dept. of Information and Communication Engineering MunKyung College South Korea Department of Electronics and Computer Engineering SungKyunKwan University South Korea

ISBN: (纸本)0780381149

Channel estimation in OFDM systems with space-time coding is essential. While the conventional charm estimation schemes using both IFFT and FFT are effective for OFDM system with all sub-carriers occupied by data, it will result in the performance deterioration in OFDM system with null data as in IEEE802.11a. In this paper, we propose a channel estimation technique operating in frequency domain without using both IFFT and FFT. The proposed scheme basically uses curve fitting technique. The performance of the channel estimation using curve fitting depends on channel delay spread. Thus, we present a method to change the group size for curve fitting in unknown channels. In addition, we compare the performance of STBC-OFDM with STTC-OFDM. We expect that the proposed channel estimation technique can be effectively used for OFDM system not only with transmit diversity but also without transmit diversity.

关键词： Channel estimation Curve fitting Frequency domain analysis Local area networks Maximum likelihood decoding OFDM Receiving antennas Space time codes Transmitting antennas Wireless LAN

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Optical Configuration of a HAN Cell for Reflective Displays

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Journal of information Display 2003年第2期4卷 25-28页

作者： Lee, Seo-Hern Jang, Mi-Kyoung Jeong, Jin-Kwan Yoon, Tae-Hoon Kim, Jae-Chang Department of Electronics Engineering Pusan National University Department of Electronics Engineering Pusan National University Research Institute of Computer Information and Communication Pusan National University

We propose a new optical configuration of a hybrid-aligned nematic liquid crystal cell for reflective displays, which consist of a biaxial film for obtaining wide viewing angle and a half-wave film for achieving high contrast. As a result, we can achieve wide viewing angle of (80( for the horizontal direction and (50( for the vertical direction and uniform reflection spectrum.

关键词： hybrid-aligned nematic liquid crystal cell wide viewing angle high contrast reflective LCD

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An efficient rate-distortion analysis model for MPEG video

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6th IEEE International Conference on High-Speed Networks and Multimedia communications, HSNMC 2003

作者： Lee, Mike Myung-Ok Hong, Sung-Hoon School of Information and Communication Engineering Dongshin University Chonnam 252 Daeho-Dong Naju520-714 Korea Republic of Department of Electronics Computer and Information Engineering Chonnam National University 300 Yongbong-Dong Puk-Ku Gwangju500-757 Korea Republic of

ISBN: (纸本)3540405429

In this paper, we propose a rate-distortion estimation method for MPEG-2 video, which enables us to predict the amount of bits and the distortion generated from an encoded picture at a given quantization step size and vice versa. The proposed estimation method has some outstanding advantages. First, the computational complexity is small because its major operation is just to obtain a histogram or weighted histogram of the DCT coefficients from an input picture, and the final form of the proposed estimation model is simple. Second, its results are very accurate enough to be applied to practical video coding applications. Simulation results show that the estimation errors for rate and distortion do not exceed 2.5% and 1%, respectively. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Image coding

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