时间序列无缝拼接技术

通过对时间序列非重叠分帧滤波算法的仿真分析提出了时间序列的无缝拼接问题.讨论了一种重叠分帧滤波处理算法,该算法通过对相邻各帧分别进行重叠取样,实现了帧与帧之间的无缝拼接,仿真试验结果证实了该方法的有效性.     

任意帧结构MPEG-2到MPEG-4 FGS视频流转换编码算法

在从MPEG-2视频流到MPEG-4 FGS视频流的转换编码中,需要考虑多种帧结构类型。本文就三种帧结构:全I帧,IPPP,IBBP进行了分析,并选出对应的转换编码结构。其中兼顾了效率和输出质量。在IPPP帧结构中,转换编码结构需要对显著的色差漂移误差进行校正。对于IBBP帧结构,因色差漂移误差不明显,故选择较简单的编码端闭环结构转换编码器。     

数字HDTV TS流无缝拼接技术研究

针对两个不同数字HDTV TS节目流播放切换时产生短暂的黑屏进行研究。提出了调整第二个数字HDTV TS节目流解码、显示时间，使它解码、显示时间同第一个节目流解码、显示时间连续；调整拼接点处ES流码率，防止EB1缓冲区下溢两种方法来实现两个不同数字HDTV TS流的无缝拼接，除去了两个流一起播放时产生的黑屏现象。     

数字电视TS流无缝拼接技术的研究与实现

数字电视TS流无缝拼接技术是MPEG-2节目编辑的关键技术之一,它不需要进行数模转换,不必修改PES包,而直接基于MPEG-2 TS流的语法结构和MPEG-2的视频编解码方式进行单个节目或多个节目之间的拼接本文在简要介绍了TS流的基础上着重阐述了TS流拼接的基本概念TS拼接实现的整体框架以及几个重要模块功能的实现。     

三星首款无缝拼接液晶显示器量产

5月6日,三星首款无缝拼接液晶显示器——UT系列,近日在韩国三星显示器工厂正式批量生产,不久将在全球范围内同步投放,预计5月中下旬将全面推向中国市场。     

长虹展示大屏幕无缝拼接等离子屏

在2008中国国际消费电子博览会上．四川长虹集团展出了大屏幕无缝拼接等离子屏MPDP。     

MPEG-2 TS流无缝拼接技术的研究与实现

介绍了一种基于MPEG-2语法结构对TS流进行无缝拼接的方法,它不需要进行模数转换,而直接基于MPEG-2语法结构进行拼接,是一种全数字式的拼接方法,避免了由模数、数模转换中引入的噪声影响.整个系统只用到了数字处理FPGA芯片,以及缓存FIFO两块主要芯片,电路简单,同时它还有很好的通用性和可扩展性.     

无缝拼接边缘融合大屏幕显示技术

无缝拼接也叫边缘融合是指一组投影机投出的画面经过边缘融和技术实现一整幅完整画面的过程。边缘融合机是指可以实现边缘融合过程的设备。边缘融合由于采用多台投影机拼接．所以它带来的直接优点是：增大投影面积,增加投影分辨率．缩短投影距离。除此之外,应用边缘融合无缝拼接技术可以实现多个模拟VGA画面与视频AV画面的多重叠加,跨屏漫游,弧面、     

基于802.15.4无线网络与以太网帧结构转换

对比当前的无线传感器网络的主要特点,设计了一种新型的网络。提出了将监测区域再分区的设想,同时对同一监测区域的不同类型的节点和相同类型的不同节点进行了区分识别。提出了类似网桥功能的Sink节点模型,设计了Sink节点的帧结构转换流程。针对目前IEEE802.15.4 16位短地址格式没有统一规范的情况,提出了基于节点区分的短地址格式设置,使得用户能够更方便的管理传感器节点。     

数字电视节目无缝拼接的研究和实现

基于MPEG-2标准的来自于不同时间基准的两路数字电视节目流在切换时会产生短暂的黑屏现象,本文分析了其产生的原因,提出了一种方法即通过拼接点的选择和调整系统参考时钟PCR来实现不同TS流的无缝拼接,经验证消除了黑屏现象,实现电视画面的流畅衔接。     

Call Admission for MPEG Video Streams

In modern visual communications, transmitted data may be discarded because of network congestion. With the constraint on transmission delay, the lost data cannot be retransmitted and therefore may cause a fatal degradation on the visual quality. In this paper, we discuss some topics of delivering MPEG video over networks for robust transmission. Not only are relevant techniques introduced, but we also present an empirical bandwidth allocation strategy. The essential motivation of the proposed strategy is to eliminate the burst of MPEG video streams and thereby retain the quality of visual service. The experimental results indicate that the proposed strategy can allocate an effective bandwidth for MPEG video streams. Moreover, the proposed strategy can still maintain the same level of network utilization that compares to the optimum solution, which is found based on an exhaustive search.     

MPEG VBR视频流统计复用技术

ＭＰＥＧ的ＣＢＲ编码与ＶＢＲ编码各有优缺点,但经多路ＭＰＥＧ ＶＢＲ编码的视频流可通过统计复用获得较好的图像质量和较高的带宽增益。分析了一些典型的统计复用策略,指出了它们的缺欠,认为在数字视频广播中应采用联合码率控制技术代替统计复用技术。     

MPEG—2视频码流的拼接

1 前言 运动图像及其伴音的压缩编码技术是多媒体计算机、多媒体数据库、多媒体通信、标准清晰度电视(SDTV)、高清晰度电视(HDTV)及交互式电视(Interactive TV)等系统中的关键技术。国际标准化组织(ISO)1986年成立了制定运动图像及其伴音压缩编码标准的运动图像专家组MPEG(Moving Picture Expert Group)。1993年MPEG正式推出用于数字存储媒体、码率直到1.5Mbps的MPEG-1标准(ISO/IEC     

适用于MPEG2 MP@ML标准的视频解码器设计

设计了一个适用于 MPEG2 MP@ML 标准的视频解码器结构 ,用 VHDL 语言进行了系统级的仿真和综合。系统工作时钟频率 40 MHz。用标准图象测试序列进行了验证 ,给出了测试结果和有关参数 ,满足 MPEG2 MP@ML 视频解码的实时处理要求。     

一种基于MPEG-2视频流的有效性测量方法

提出了一种基于MPEG-2压缩域视频信号的测量方法,该方法根据压缩域视频信号中前后帧之间的相关性,提取出能够较好代表视频信号内容的Ⅰ帧.利用"钻石"波形显示法显示关键帧的RGB信号幅度是否超出了标准规定的范围,从而对整个视频序列的色域超标做出评价.这种方法由于无需全部解压,可以大大提高测量的速度,具有较高的实用价值.     

Reducing Encoder Bit-Rate Variation in MPEG Video

A shortcoming of current video transmission using the MPEG standard is that its encoder produces a variable bit rate (VBR). Due to this, the encoder output has to be buffered and released over the network at a constant rate. This buffering of the encoder output introduces an additional delay between the encoding and decoding phases of the video transmission. To remedy this problem, we present a strategy to distribute the load produced by the encoder as evenly as possible, i.e., try to have a constant bit rate (CBR). This is done by treating the slices in each frame separately while compressing them and then mixing the different kinds of slices that are sent over the network. The resulting load variation is much more uniform, reducing the buffering delay and making future bandwidth requirement estimates more accurate.This material is based upon work supported in part by the National Science Foundation under Award No. IRI-9526004, by the Texas Advanced Research Program under Grant No. 3652270, and by a grant from the University of Houston Institute of Space Systems Operations. Rajat Agarwal is now with Lucent Technologies. This paper is an extended version of a shorter paper presented at IEEE ICMCS 1999.Albert Mo Kim Cheng received the B.A. with Highest Honors in Computer Science at age 19, graduating Phi Beta Kappa, the M.S. in Computer Science with a minor in Electrical Engineering at age 21, and the Ph.D. in Computer Science at age 25, all from The University of Texas at Austin, where he held a GTE Foundation Doctoral Fellowship. Dr. Cheng is currently a tenured Associate Professor in the Department of Computer Science at the University of Houston, where he is the founding Director of the Real-Time Systems Laboratory. He has served as a technical consultant for several organizations, including IBM, and was also a visiting faculty in the Departments of Computer Science at Rice University (2000) and at the City University of Hong Kong (1995).He is the author/co-author of over seventy refereed publications in IEEE Transactions on Software Engineering, IEEE Transactions on Knowledge and Data Engineering, Real-Time Systems Symposium, Real-Time and Embedded Technology and Applications Symposium, and other leading conferences. One of his recent work presents a timing analysis of the NASA X-38 Space Station Crew Return Vehicle Avionics, which contains a fault-tolerant distributed system.Dr. Cheng has received numerous awards, including the National Science Foundation Research Initiation Award (now known as the NSF CAREER award). He has been invited to present seminars and tutorials at over 30 conferences, and has given invited seminars/keynotes at over 20 universities and organizations, most recently at ICEIS, Ecole Superieure de l Ouest (ESEO), Angers, France, April 2003. His next invited keynote speech will be at the 1st Intl. Conf. on Informatics in Control, Automation and Robotics (ICINCO), Setubal, Portugal, August 2004.He is an Associate Editor of the IEEE Transactions on Software Engineering (1998-2003), a Guest Co-Editor of two IEEE TSE Special Issues on Software and Performance (Nov. and Dec. 2000), an Associate Editor of the International Journal of Computer and Information Science, the work-in-progress program chair of the 2001 IEEE-CS Real-Time Technology and Applications Symposium, the work-in-progress session chair of the 2003 IEEE-CS Real-Time Systems Symposium, and the invited special panel chair for the software engineering for multimedia session at the 1999 IEEE-CS International Conference on Multimedia Computing Systems (ICMCS). Currently, he is a member of the program committees of RTSS, RTAS, ICEIS, ICECCS, RTAS, LCN, COMPSAC, ICCCN, AIA, DBA, PDCN, SE, and ICINCO. Dr. Cheng is an Honorary Member of the Institute for Systems and Technologies of Information, Control and Communication (INSTICC). He is a Senior Member of the IEEE.Dr. Cheng is the author of several book chapters on E-commerce/Enterprise Information Systems, and an article entitled Embedded OS, in the upcoming Encyclopedia of Computer Science and Engineering (John Wiley & Sons). He is the author of the new senior/graduate-level textbook entitled Real-Time Systems: Scheduling, Analysis, and Verification (John Wiley & Sons). cheng@cs.uh.eduRajat Agarwal received the M.S. in Computer Science from the University of Houston. He is currently a Member of the Technical Staff at Lucent Technologies. His research interest is in real-time multimedia systems.     

Modeling the MPEG-1 Video Traffic

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎＢＩＳＤＮ，ＶＢＲｖｉｄｅｏｔｒａｆｉｃｗｉｌｂｅａｎｉｍｐｏｒｔａｎｔｔｙｐｅｏｆｔｒａｆｉｃ．ＴｈｅｔｙｐｅｏｆｔｒａｆｉｃｗｉｌｂｅｃｏｄｅｄａｃｃｏｒｄｉｎｇｔｏＭＰＥＧｓｔａｎｄａｒｄｍａｉｎｌｙ．Ｂｅｃａｕ...     

基于 MPEG-4的视频编解码系统研究与实现

采用了专用 MPEG-4芯片(vw2010) 方案来实现 MPEG-4音视频编解码功能。首先介 绍了 VW2010的特点以及其工作原理，然后详细地阐述了以此芯片为核心的电路模块的设计，主要包括 编解码系统电路原理设计、接口设计、编解码工作原理及编解码流程等。最后就实现的编解码功能给予 分析与展望。     

MPEG2专用视频解码VLSI中的控制策略

本文提出了一种新的适用于MPEG2专用视频解码芯片的控制策略：分散控制。该方案完全由各功能模块相互协调控制整个视频解码过程，而不需要总体控制，它满足对MPEG2视频规定的所有级别尤其是MP@HL进行实时解码的要求。与总体控制方式比较，分散控制机制对视频解码各功能模块没有严格的时间限制，可根据具体解码任务特性设计模块从而达到局部性能最优；同时分散控制过程简单，解码效率高，而且连接各功能模块间的缓存相当小，可大幅度的减小芯片的硬件开销，使得系统整体性能最优。     

视频流传输中的差错复原视频编码技术

视频压缩技术在采用预测技术、变换编码技术和可变长熵编码技术以减少冗余信息的同时,也降低了视频流的容错能力.传输信道中的差错,不仅严重损害了视频服务质量,甚至会使通信系统崩溃,因此,在有错信道上进行视频传输,差错复原视频编码技术就显得尤为重要.对差错复原视频编码技术进行了概括和总结,首先指出在视频传输过程中存在的由于传输错误而引发的比特流同步丢失及错误蔓延问题,然后研究了解决这些问题的差错复原视频编码方法,最后指出:可伸缩视频编码和多描述视频编码是差错复原视频编码的发展方向;多描述编码同多路径技术相结合,能显著提高压缩视频信号的错误恢复能力和传输信道的性能.