MPEG-4及其在VOD业务中的应用

本文介绍视频点播（ Ｖ Ｏ Ｄ） 业务和 Ｍ Ｐ Ｅ Ｇ ４ 国际最终标准草案的主要内容,分析了 Ｍ Ｐ Ｅ Ｇ ４ 标准在 Ｖ Ｏ Ｄ 业务中的应用,指出 Ｍ Ｐ Ｅ Ｇ ４ 将成为未来 Ｖ Ｏ Ｄ 系统的主要编码标准。     

浅析MPEG-4标准在钟祥广电宽带网VOD系统中的应用

随着数字和网络技术等高科技发展速度的越来越快,广播电视行业的布局和结构也发生了新的变化——向数字化、网络化靠近。广播电视是国家精神文明建设的重要手段,必须实现高速跨越式发展,才能满足人民群众日益增长的多层次、多样化、个性化的要求。     

MPEG-4标准剖析

本文分析了MPEG-4的七个功能、MPEG-4视频编码规则、音频编码规则及MPEG-4应用举例等.     

MPEG-4和MPEG-2标准的比较（下）

视频和音频编码完成后，需要通过传送部分把数据送给解码器。MPEG-2和MPEG-4在数据传送方面有些相似性：     

MPEG-4视频标准及其关键算法

MPEG-4引入了视频对象的概念,有效地支持基于内容的图像编码,对不同的视频源标准格式和不同的视频码率提供有效的编码,以满足众多多媒体的应用需求。本文系统地分析了MPEG-4视频编码算法,对MPEG-4视频标准的关键概念进行了详细的解释。     

MPEG-4标准浅析

对支持多媒体应用的MPEG-4标准关键技术进行分析，归纳了MPEG-4标准的新特点，并对MPEG-4的应用前景进行了展望。     

MPEG-4标准的介绍及其应用

MPEG-4是一个全新的多媒体标准，采用了基于对象和模型的编码方法。本文就它的主要功能和特点以及编码原理和应用作详细介绍。     

VOD业务的市场预测

有两个讨厌的问题——带宽和内容拖慢了电缆视频点播(VOD)业务方式大范围的部署建设,但是舆论认为:点播业务最明显的是电影VOD和事件VOD,注定要成功,至少也是一个非常好的业务。 据Yankee集团公司预测,VOD的收入到2005年至少可达19亿美元(图1);而可接收的投资回报     

MPEG-4技术及其应用

数字技术的蓬勃发展和广泛应用使人类社会迈入了“数字时代”。今天，采用数字技术的视听设备已走进普通百姓的日常生活之中，MPEG(Moving Picture Expens Group，运动图像专家组)就是我们经常在视听设备的说明书中看到的一个词汇。本就针对MPEG系列标准里面的MPEG-4做详细的分析。     

基于MPEG-4的数字监控系统

介绍了一种基于MPEG-4的数字监控系统的系统构成和软件实现方法。该系统采用MPEG-4标准压缩方法,比较其他压缩方法其压缩比更大。通过对MPEG压缩原理的分析,比较了MPEG-1、MPEG-2和MPEG-4三种标准,说明MPEG-4采用视频对象VO的概念进行编码,更适合远程数字监控。     

MPEG-4编、解码器容错技术的研究

在分析MPEG-4码流结构的基础上，对编码器提出了两点改进：一是对DCT系数不采用AC预测编码；二是对B帧宏块的4种编码模式全部编码。实验表明，这两点改进在基本不降低编码效率的条件下提高了对错误的抵抗力。在解码端提出了一种既能检测本数据包差错又能防止下一数据包头被错误解码的方法。针对B帧差错块的恢复，提出了一种基于运动矢量估计的方法。能有效地解决直接拷贝参考帧相应宏块所引起的图像错位问题。     

基于MPEG-2复用算法的MP4视频复用算法研究

简要分析现有的MPEG-2的视频传输及复用方法。在此基础上提出一种对MPEG-4视频基本流进行MPEG-2的TS复用方法。对MPEG-4视频码流进行分析，从视频流中提取视频帧进行单路MP4视频音频复用，并在此基础上对多路MPEG-4的基本视频流进行复用。     

Platform-Based MPEG-4 SOC Design for Video Communications

An MPEG-4 video coding SOC design is presented in this paper. We adopt platform-based architecture with an embedded RISC core and efficient memory organization. A motion estimator supporting predictive diamond search and spiral full search is implemented for compromise between compression performance and design cost. The proposed data reuse scheme reduces required memory access bandwidth. For texture coding path, an interleaving DCT/IDCT scheduling with substructure sharing technique is proposed. Several key modules are integrated into an efficient platform in hardware/software co-design fashion. The cost-efficient video encoder SOC consumes 256.8 mW at 40 MHz and achieves real-time encoding of 30 CIF (352×288) frames per second. Yung-Chi Chang was born in Kaohsiung, Taiwan, R.O.C., in 1975. He received the B.S. and M.S. degrees from the Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C., in 1998 and 2000, respectively, where he is currently pursuing the Ph.D. degree in the Graduate Institute of Electrical Engineering. His research interests include video coding algorithms and VLSI architectures for image/video processing. Wei-Min Chao was born in Taoyuan, Taiwan, R.O.C., in 1977. He received the B.S. and M.S. degrees from the Department of Electronics Engineering, National Taiwan University in 2000 and 2002 separately. His research interests include video coding algorithms and VLSI architecture for image and video processing. Chih-Wei Hsu was born in Taipei, Taiwan, in 1979. He received the B.S.E.E and M.S.E.E degrees from National Taiwan University (NTU), Taipei, in 2001 and 2003, respectively. He joined MediaTek, Inc., Hsinchu, Taiwan, in 2003, where he develops integrated circuits related to multimedia systems and optical storage devices. His research interests include object tracking, video coding, baseband signal processing, and VLSI design. Liang-Gee Chen was born in Yun-Lin, Taiwan, in 1956. He received the B.S., M.S., and Ph.D. degrees in electrical engineering from National Cheng Kung University, Tainan, Taiwan, in 1979, 1981, and 1986, respectively. He was an Instructor (1981-1986), and an Associate Professor (1986-1988) in the Department of Electrical Engineering, National Cheng Kung University. In the military service during 1987 to 1988, he was an Associate Professor in the Institute of Resource Management, Defense Management College. In 1988, he joined the Department of Electrical Engineering, National Taiwan University. During 1993 to 1994 he was a Visiting Consultant of DSP Research Department, AT & T Bell Lab, Murray Hill. In 1997, he was a visiting scholar of the Department of Electrical Engineering, University of Washington, Seattle. During 2001 to 2004, he was the first director of the Graduate Institute of Electronics Engineering (GIEE) in National Taiwan University (NTU). Currently, he is a Professor of the Department of Electrical Engineering and GIEE in NTU, Taipei, Taiwan. He is also the director of the Electronics Research and Service Organization in Industrial Technology Research Institute, Hsinchu, Taiwan. His current research interests are DSP architecture design, video processor design, and video coding systems. Dr. Chen has served as an Associate Editor of IEEE Transactions on Circuits and Systems for Video Technology since 1996, as Associate Editor of IEEE Transactions on VLSI Systems since 1999, and as Associate Editor of IEEE Transactions on Circuits and Systems II since 2000. He has been the Associate Editor of the Journal of Circuits, Systems, and Signal Processing since 1999, and a Guest Editor for the Journal of Video Signal Processing Systems. He is also the Associate Editor of the Proceedings of the IEEE. He was the General Chairman of the 7th VLSI Design/CAD Symposium in 1995 and of the 1999 IEEE Workshop on Signal Processing Systems: Design and Implementation. He is the Past-Chair of Taipei Chapter of IEEE Circuits and Systems (CAS) Society, and is a member of the IEEE CAS Technical Committee of VLSI Systems and Applications, the Technical Committee of Visual Signal Processing and Communications, and the IEEE Signal Processing Technical Committee of Design and Implementation of SP Systems. He is the Chair-Elect of the IEEE CAS Technical Committee on Multimedia Systems and Applications. During 2001--2002, he served as a Distinguished Lecturer of the IEEE CAS Society. He received the Best Paper Award from the R.O.C. Computer Society in 1990 and 1994. Annually from 1991 to 1999, he received Long-Term (Acer) Paper Awards. In 1992, he received the Best Paper Award of the 1992 Asia-Pacific Conference on circuits and systems in the VLSI design track. In 1993, he received the Annual Paper Award of the Chinese Engineer Society. In 1996 and 2000, he received the Outstanding Research Award from the National Science Council, and in 2000, the Dragon Excellence Award from Acer. He is a member of Phi Tan Phi.     

数字水印算法及其在MPEG-4上的应用

文中阐述了数字水印的几个特有性质和实际应用中的几种典型算法,并在离散余弦变换的直流系数嵌入法的基础上,改进了现有MPEG-4视频中的数字水印的编码和解码算法.改进后的算法与原有算法相比,数字水印的安全性、保真性、鲁棒性、稳定性、信息容量、自恢复性等各方面都有很大的提高和改进,同时也降低了一些计算上的复杂度.     

一种新的MPEG-4二值形状空域可扩展编码算法

可扩展编码和形状编码技术是MPEG-4视频编码部分的两个关键技术。文章在分析视频图像二值形状信息特点的基础上．提出了一种新的MPEG—4二值形状空域可扩展编码算法。试验结果表明这种算法编解码简单，速度快．码率较小。     

基于ARM926EJ-S处理器的MPEG-4视频解码研究及实现

详细分析了MPEG-4视频解码算法,设计出基于ARM926EJ-S处理器的MPEG-4软件解码方案.通过对模块算法进行优化,提高了嵌入武终端MPEC-4解码器的性能.