MPEG-7及其在CADTV-STB中的应用

CADTV(有线数字电视)系统的STB(机顶盒),向用户提供了更为宽松的交互环境,用适合于用户的多媒体交互业务,把TV(电视)节目和广告连接到网页,提供着信息的交互应用。而交互应用的实现,对于MPEG-4来讲,可说是“正中下怀”、“恰到好处”,因为MPEG—4就是为支撑这些交互应用而诞生的。     

宽带数据网基础知识讲座(9)CADTV-STB

(上接第 0 9/10期 )1　引言如今 ,由于世界各国大多数有线电视系统尚未升级到数字式 ,广大的有线电视观众还无法与他们的电视实现交互 ,即使已经升级 ,可供播放的交互式数字电视节目也是寥寥无几 ,但对一些有线电视观众而言 ,CADTV(有线数字电视 )系统中STB(Set -Top -Box ,机顶盒 )的应用与信息发布的最大不同 :一是其主动性 ,二是其选择性 ,这种形式更符合信息资源消费者的深层需要。相对于功能日益强大的CADTV -STB来说 ,实现交互式电视是一件不值一提的小事 ,专家们认为 ,CADTV -STB将会成为家庭各种电器的控制中心。目前 ,…     

MPEG—4编码技术及其应用

本文从编码理念、数据结构、时域、空域、可调性和抗差错措施4个方面介绍了MPEG－4编码技术，并介绍了MPEG－4技术的部分应用。     

MPEG—4与MPEG—7浅释

MPEG-4是最近推出来的视频格式,其势头很猛,而MPEG-7标准也已经在研究之中,大约在明年年初拿出方案。那么,它同我们市面上的VCD(MPEG-1)和DVD(MPEG-2)有何异同呢,下面浅释一下它们的特点: MPEG本是Moving Pictures Experts Group,运动图像专家组的英文缩写,这个专家组始建于1988年,专门负责为CD建立视频和音频标准,其成员均为视频、音频及系统领域的技术专家。由于ISO/IEC11172压缩编码标准是由该小组     

论MPEG-4及其在数字CATV-STB中的应用

数字CATV(有线电视)系统的STB(Set-Top-Box：机顶盒)向用户提供了更为宽松的交互环境，用适合于用户的多媒体交互业务，把TV(电视)节目和广告连接到网页，提供着信息的交互应用.而交互应用的实现，对于MPEG-4来讲，可以说是“正中下怀”、“恰到好处”，因为MPEG-4就是为支撑这些交互应用而诞生的。     

论CADTV广播通道的传输协议

在有线数字电视(Cable Digital Television CADTV)系统中．中间件提供的CADTV业务应用的运行环境包含了对CADTV广播通道的传输协议和内容格式的支持。一方面中间件通过定义，规范CADTV系统的传输协议、内容格式和系统应用框架．实现CADTV业务系统的互操作性．另一方面．中间件作为一个独立的软件层运行在CADTV系统以及接收终端机顶盒(STB)上．     

MPEG—4在多媒体移动通信中的应用研究

从MPEG－4系统层分析了MPEG－4用于多媒体移动通信的可行性,并给出了其中一个基于PDA的目标应用。根据MPEG－4系统的主要任务,采用现代软硬件系统集成方法,对系统实现进行了软硬件划分,开发了一套相应的IP模块,主要包括灵活分路器、同步层析解、同步控制、二进制格式场景（BIFS0译码、对象描述器（OD）译码和视频组合器。     

浅议MPEG-4标准及其应用

本文从MPEG-4标准的主要特点、MPEG-4标准的技术体系、MPEG-4音频对象（AO）的编码、MPEG-4视频对象（VO）的编码、MPEG-4交互式AV场景描述、MPEG-4的多媒体应用等方面，分析与概述了MPEG—4标准的技术内容以及MPEG-4标准的应用情况。     

论MPEG—7及其应用

随着“信息黑洞”这一名词的出现，人们从遍布全球的信源处查询所需要的多媒体信息变得异常复杂和困难。亟需一种解决方案，来完成这类信息的“描述”和“搜索”／“过滤”，以便应用于各种场合。MPEG－7就是为提供这一解决方案而诞生的。     

浅议MPEG-7标准及其应用

本文主要从MPEG-7标准与MPEG-1、MPEG-2、MPEG-4标准的关系、MPEG-7标准的目标、MPEG-7 标准的构成要素等方面,分析与概述了MPEG-7标准的技术内容,并从MPEG-7标准的Pull类应用和Push类应用两方面介绍了MPEG-7标准的应用情况。     

MPEG—2数字压缩视频的转换编码及其应用

文章介绍了四种基本的MPEG－2编码视频的转换编码器结构，对其在数字电视系统和数字视频产品中的应用前景进行了分析。     

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.     

MPEG-4流媒体技术及其实现方法

详细地介绍了一种基于MPEG-4压缩的嵌入式网络流媒体采集、传输和控制应用系统的设计与实现技术。该嵌入式平台采用203 MHz的ARM920T内核处理器S3C2410B,嵌入式操作系统采用Linux操作系统,用户可在这个系统平台上进行自主软件开发。视频采集模块采用TI公司的TVP5145,视频压缩芯片采用硬压缩W IS GO7007B进行处理,将Y:Cb:Cr格式的视频流转换为MPEG-4编码。     

MPEG—4标准及多媒体应用

MPEG 4标准面向众多而非特定的应用。它不仅是针对一定比特率下的视频、音频编码 ,更加注重多媒体系统的交互性和灵活性。MPEG 4试图达到两个目标 :一是低比特率下的多媒体通信 ;二是多工业的多媒体通信的综合。MPEG 4可满足未来音频视频应用的广泛需求 ,实现基于内容的交互性、可重用性和可伸缩性。文章介绍了MPEG 4系统框架模型、基于模型编码及基于语义编码及多媒体上的应用示例     

The MPEG-4 Multimedia Coding Standard: Algorithms, Architectures and Applications

The upcoming MPEG-4 standard provides new possibilities for the compression and presentation of multimedia contents. The main characteristics of MPEG-4 are the object-based coding and representation of an audio-visual scene and the ability to code objects of natural or synthetic origin. These features will enhance existing applications with new functionalities and enable standardised solutions for new applications. This paper provides an overview of the three major parts Systems, Visual and Audio of the new MPEG-4 standard, highlights implementation aspects for some envisaged types of MPEG-4 terminals and describes possible future multimedia application scenarios using MPEG-4 functionalities.     

A Computational Memory Architecture for MPEG-4 Applications with Mobile Devices

This paper presents a Computational Memory architecture for MPEG-4 applications with mobile devices. The proposed architecture is used for real-time block-based motion estimation, which is the most computational intensive task in the video encoder. It uses the exhaustive block-matching algorithm (EBMA) for motion estimation. The proposed architecture consists of embedded SRAMs and a number of block-matching units working in parallel to process video data while stored in the memory. The block-matching units access the embedded SRAMs simultaneously, which increases the speed of the architecture. The architecture processes CIF format video sequences (i.e., the frame size is 352 × 288 pixels) with block size of 16 × 16 pixels and ±15 pixels search range. The proposed architecture has been designed, prototyped, and simulated for 0.18 μm TSMC CMOS technology. The simulation shows that the proposed architectures processes up to 126 CIF frames per second with clock frequency 100 MHz. The synthesized prototype of the proposed architecture includes 200 KB memory and it has an area of 33.75 mm² and consumes 986.96 mW @100 MHz. Mohammed Sayed received his B.Sc. degree from Zagazig University, Zagazig, Egypt, in 1997 and a postgraduate diploma in VLSI design from the Information Technology Institute (ITI), Cairo, Egypt, in 1998. In 2003 he received his M.Sc. degree from University of Calgary, Calgary, Canada. From 1998 to 2001 he was a research and teaching assistant at the Electronics & Communications Engineering Department, Zagazig University, Egypt. In 2001 he became a research assistant at the Department of Electrical and Computer Engineering, University of Calgary, Canada. His current research interests are System-on-Chip, Embedded Memories, and Digital Video Processing. Mr. Sayed received a number of scholarships and awards such as iCORE Scholarship from 2003 to 2005, SMC Industrial Collaboration Award in June 2003, and the Micronet Annual Workshop Best Paper Award in April 2002. He has a number of journal and conference publications and a number of contributions to the MPEG-4 standard (ISO/IEC JTC1/SC29/WG11 MPEG2002/ M8562 and M8563). Wael Badawy is an associate professor in the Department of Electrical and Computer Engineering. He holds an adjunct professor in the Department of Mechanical Engineering, University of Alberta. Dr. Badawy's research interests are in the areas of: Microelectronics, VLSI architectures for video applications with low-bit rate applications, digital video processing, low power design methodologies, and VLSI prototyping. His research involves designing new models, techniques, algorithms, architectures and low power prototype for novel system and consumer products. Dr. Badawy authored and co-authored more than 100 peer reviewed Journal and Conference papers and about 30 technical reports. He is the Guest Editor for the special issue on System on Chip for Real-Time Applications in the Canadian Journal on Electrical and Computer Engineering, the Technical Chair for the 2002 International Workshop on SoC for real-time applications, and a technical reviewer in several IEEE journals and conferences. He is currently a member of the IEEE-CAS Technical Committee on Communication. Dr. Badawy was honored with the “2002 Petro Canada Young Innovator Award”, “2001 Micralyne Microsystems Design Award” and the 1998 Upsilon Pi Epsilon Honor Society and IEEE Computer Society Award for Academic Excellence in Computer Disciplines. He is currently the Chairman of the Canadian Advisor Committee (CAC) and Head of the Canadian Delegation on ISO/IEC/JTC1/SC6 “Telecommunications and Information Exchange Between Systems”. Member, The Canadian Advisory Committee for the Standards Council of Canada—Subcommittee 29: Coding of Audio, Picture Multimedia and Hypermedia Information, and Canadian Delegate, The ISO/IEC MPEG standard committee. He is a voting Member on the VSI Alliance. He is also the Chair of the IEEE-Southern Alberta Society-Computer Chapter.     

一种基于八叉树的Huffman解码方法及其在MPEG-4中的应用

传统的二值Huffman解码方法的解码效率较低。为了提高解码速度,该文提出了一种基于八叉树的Huffman解码方法。该方法将Huffman码表示为八叉树结构,并根据各个节点在树中的位置将码表重建为一维数组。解码时,每次从码流中读取3 bit码元,并使用数值计算代替判断和跳转操作,从而提高了解码效率。将本文方法应用于MPEG-4 VLC和RVLC解码的实验结果表明,该方法在内存增加不大的情况下能大幅度提高Huffman解码效率,其性能优于其它方法。