MPEG-2视频编码标准及CLM4400视频编码芯片简介

本文通过MPEG-2和MPEG-1在视频方面的比较，简略地介绍了MPEG-2视频标准，并附带介绍了C-CUBE公司的MPEG-2视频编码芯片CLM4400的功能和应用前景。     

基于MPEG-4视频标准数字视频录像机的设计与实现

国内外许多公司都在开发有关MPEG-4视频标准的产品,最具代表意义的即是数字视频录像机(DVR)。为了缩短开发周期,这里介绍基于嵌入式Linux操作系统,应用专用音视频编解码芯片AT2042实现数字视频录像机功能,该系统实现MPEG-4视频标准高级框架的编解码器,并在此基础上添加数字硬盘的功能,例如编码存储、解码播放、快进、快退和暂停等功能。最后给出系统的实际运行的测试结果。该系统已实现对视频数据的编、解码,且实现MPEG-4/MPEG-2/MPEG-1 H.263视频标准,并已成为成型产品推向市场。     

基于TMS320C6201设计的MPEG-4 SVP视频解码器

TMS320C6201是美国TI公司生产的一种高性能数字信号处理芯片。利用TMS320C6201数字信号处理芯片可以实现MPEG-4SVP视频解码;文章阐述了视频解码器的解码过程、算法优化及程序优化方法;给出了MPEG-4 SVP解码器的实验测试结果。     

我视频编码国家标准AVS与国际标准MPEG的比较

本文从技术角度对MPEG-2的视频标准、MPEG-4AVC/H.264和AVS视频(GB/T 200090.2)三个视频标准进行对比,包括技术方案、主观测试、客观测试、复杂度等四个方面。一、技术对比AVS视频与MPEG标准都采用混合编码框架     

基于IP的MPEG-4视频编码器设计及其在应急通信中应用

介绍了MPEG-4视频压缩标准及视频采集、编码原理，以数字信号处理芯片DSP TMS320C6211构建平台．设计了应用于矿山救援应急多媒体通信中，基于IP传输的MPEG-4视频编码器硬软件，重点讨论算法优化方法．并给出实际应用结果。     

科达MPEG-2技术通过广电测试

最近，科达视频会议产品通过了国家广播电影电视总局广播电视规划的测试。测试结果表明，科达的视频会议系统支持标准的MPEG-2图像编码和MPEG Layer2的双声道音频编码，码流格式完全符合传输流（TS）规范，视频图像带宽可达到8M，     

基于MPEG-4视频采集PCI板卡的设计与实现

介绍一种基于MPEG-4的视频压缩编码卡。该板卡为4路的编码PCI卡，将采集到的模拟视频图像以MPEG-4的方式进行压缩处理。使用标准PCI2．2的规范，完成有CPU控制板与编码PCI卡之间的通信，使CPU控制板通过一块桥芯片可以访问编码芯片内部寄存器，读出编码芯片压缩的MPEG-4的视频压缩流、音频压缩流。从而使压缩的MPEG-4数据完成远程传输或本地存贮。另一个是完成视频预览功能。该板卡为实现远程实时监控提供了必要的硬件设备，他以最新的MPEG-4压缩方式进行编码，对整个数字监控系统和视频网络传输系统提供了最优化的硬件设计，使视频数据数字化管理更加方便、可靠，也使整个系统在市场竞争中更具有活力。     

展讯通信：高清AVS／MPEG-2系统级解码核芯片SV6111

展讯通信公司将于CCBN 2008推出高清AVS／MPEG-2系统级解码核芯片SV6111。 该芯片是一款先进的基于AVS标准和MPEG-2标准的机顶盒系统级解码芯片,主要应用于网络电视、有线数字电视、卫星数字电视和地面传输数字电视等多媒体领域。它支持AVS标准和MPEG-2标准的高清（HD）和标清（SD）的视频解码,同时支持多种流行的音频标准（如MPEG-1 Layer Ⅰ＆Ⅱ＆Ⅲ,AC3,AVS等）的音频解码。     

MPEG-2全Ⅰ帧压缩流的高清视频质量客观评价研究

主要研究对MPEG-2全I帧压缩的高清视频码流客观质量评价的方法,对不同码率的全I帧高清测试序列在压缩域进行压缩特征参数码率和平均量化因子的提取,并对其进行加权,得到客观质量评价值.实验结果表明,设计的视频质量客观评价系统得到的结果与主观评价具有较好的一致性,可用于MPEG-2全I帧压缩的高清视频质量评价.     

MPEG-2全I帧压缩流的高清视频质量客观评价研究

主要研究对MPEG-2全I帧压缩的高清视频码流客观质量评价的方法,对不同码率的全I帧高清测试序列在压缩域进行压缩特征参数码率和平均量化因子的提取,并对其进行加权,得到客观质量评价值。实验结果表明,设计的视频质量客观评价系统得到的结果与主观评价具有较好的一致性,可用于MPEG-2全I帧压缩的高清视频质量评价。     

Subjective evaluation of MPEG-4 video codec proposals: Methodological approach and test procedures

A new audio-visual coding standard, MPEG-4, is currently under development. MPEG-4 will address not only compression, but also completely new audio-video coding functionalities related to content-based interactivity and universal access. As part of the MPEG-4 standardization process, in November, 1995 assessments were performed on technologies proposed for incorporation in the standard. These assessments included formal subjective tests, as well as expert panel evaluations. This paper describes the MPEG-4 video formal subjective tests. Since MPEG-4 addresses new coding functionalities, and also operates at bit-rates lower than ever subjectively tested before on a large scale, standard ITU test methods were not directly applicable. These methods had to be adapted, and even new test methods devised, for the MPEG-4 video subjective tests. We describe here the test methods used in the MPEG-4 video subjective tests, how the tests were carried out, and how the test results were interpreted. We also evaluate the successes and shortcomings of the MPEG-4 video subjective tests, and suggest possible improvements for future tests. The MPEG-4 video subjective tests were successful, providing the MPEG community with critical information to guide in the selection of technologies for inclusion in the video part of the MPEG-4 standard.     

基于TM1300图像处理卡设计与实现

介绍了TM1300定点DSP芯片的硬件结构特点,设计了一套运行于TM1300之上基于MPEG-4编码标准的实时音、视频数据采集压缩卡,讨论了系统的工作原理,硬件驱动和基于PSOS操作系统的BSP及应用测试程序的编写方法.     

A 125 μW , Fully Scalable MPEG-2 and H.264/AVC Video Decoder for Mobile Applications

A low-power dual-standard video decoder has been developed for mobile applications. It supports MPEG-2 SP@ML and H.264/AVC BL@L4 video decoding in a single chip and features a scalable architecture to reach area/power efficiency. This chip integrates diverse algorithms of MPEG-2 and H.264/AVC to reduce silicon area. Three low-power techniques are proposed. First, a domain-pipelined scalability (DPS) technique is used to optimize the pipelined structure according to the number of processing cycles. Second, bandwidth scalability is implemented via a line-pixel-lookahead (LPL) scheme to improve the external bandwidth and reduce the internal memory size, leading to 51% of memory power reduction compared to a conventional design. Third, low-power motion compensation and deblocking filter are designed to reduce the operating frequency without degrading system performance. A test chip is fabricated in a 0.18mum one-poly six-metal CMOS technology with an area of 15.21 mm². For mobile applications, H.264/AVC and MPEG-2 video decoding of quarter-common intermediate format (QCIF) sequences at 15 frames per second are achieved at 1.15 MHz clock frequency with power dissipation of 125 muW and 108 muW, respectively, at 1V supply voltage     

MPEG-4解码器芯片的比较

介绍了目前市场上比较流行的一些MPEG-4编解码芯片，比较了它们的应用前景和特性，并简要介绍了新一代视频编解码标准H．264的芯片产品。     

基于ARM9的嵌入式多路视频监控系统设计

介绍一种基于ATMEL公司ARM9微处理器AT91RM9200的嵌入式多路视频监控系统方案。系统以嵌入式Linux操作系统为平台,采用TECHWELL公司的TW2834芯片对4路视频进行A／D转换,然后通过IMTIME公司MPEG-4的专用编码芯片IME6500对采集到的多路视频信号进行压缩编码,生成MPEG-4视频流。     

MPEG-2 video compression

MPEG-2 is an extension of the MPEG-1 international standard for digital compression of audio and video signals. MPEG-1 was designed to code progressively scanned video at bit rates up to about 1.5 Mbit/s for applications such as CD-I (compact disc interactive). MPEG-2 is directed at broadcast formats at higher data rates; it provides extra algorithmic 'tools' for efficiently coding interlaced video, supports a wide range of bit rates and provides for multichannel surround sound coding. This tutorial paper introduces the principles used for compressing video according to the MPEG-2 standard, outlines the general structure of a video coder and decoder, and describes the subsets ('profiles') of the toolkit and the sets of constraints on parameter values ('levels') defined to date.     

MPEG-4: a multimedia compression standard for interactiveapplications and services

The Moving Pictures Experts Group (MPEG), which produced the MPEG-1 and MPEG-2 video and audio compression standards, is developing the MPEG-4 standard. MPEG-4 targets interactive multimedia applications and will become a standard in 1999. As well as an increased compression efficiency, MPEG-4 will also offer content-based functionality, i.e. the possibility of accessing and manipulating individual objects in the picture. Furthermore, MPEG-4 will offer possibilities for efficient video storage and for transmission over poor audio and video channels at bit rates between 5 kbit/s and 4 Mbit/s. This paper gives an overview of the state of the art of MPEG-4 development, concentrating especially on video content-based functionality, which is so important for interactive applications     

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。     

Extraction of Video Objects via Surface Optimization and Voronoi Order

We implement a video object segmentation system that integrates the novel concept of Voronoi Order with existing surface optimization techniques to support the MPEG-4 functionality of object-addressable video content in the form of video objects. The major enabling technology for the MPEG-4 standard are systems that compute video object segmentation, i.e., the extraction of video objects from a given video sequence. Our surface optimization formulation describes the video object segmentation problem in the form of an energy function that integrates many visual processing techniques. By optimizing this surface, we balance visual information against predictions of models with a priori information and extract video objects from a video sequence. Since the global optimization of such an energy function is still an open problem, we use Voronoi Order to decompose our formulation into a tractable optimization via dynamic programming within an iterative framework. In conclusion, we show the results of the system on the MPEG-4 test sequences, introduce a novel objective measure, and compare results against those that are hand-segmented by the MPEG-4 committee.