基于H.263的实时视频编码技术研究

为了提高H．263编码技术现有算法的执行效率，本文提出了一种基于时域预测的预判零方法，该方法在保证一定图像质量的条件下具有较高的判别效率，能节约大量的编码时间：并在此基础上结合“钻石”运动搜索算法、MMX优化技术，实现了利用软件进行实时视频编码。     

基于TMS320C6211的实时视频编码器

介绍了一种以TMS320621为核心处理器的实时视频编码器，它采用ITU-T的H.263压缩标准，可以满足当前远程视频监控、会议电视等诸多视频/图像处理和传输领域的需求。同时，对编码器的硬件资源选择、系统工程流程、视频采集、软件开发等关键技术作了详细讨论。最后，分析了该编码器的实时性能和其它性能。     

基于H.263视频压缩的新钻石搜索算法

提出了一种基于H．263的改进的新钻石搜索算法。给出了算法流程图，重点对根据该算法自行编写并检验通过的精华程序段进行了详细的介绍和讨论。仿真实验的结果证明，实际编程实现的新钻石搜索算法远远胜于传统三步搜索法，从而大大提高了计算速度和压缩率。     

基于H.263标准的视频压缩算法的优化及研发

介绍了基于H．263标准的视频压缩算法，对作为视频压缩关键技术的运动估计算法进行了深入的研究，提出了一种改进算法，并引入英特尔公司的MMX技术进行双重优化后的新钻石搜索算法，以消除原钻石搜索算法中大量的重复计算。仿真实验结果证明，双重优化的新算法大大地提高了计算速度和压缩率。相应的研发成果已在本课题组与烟台正达公司的合作项目中得到了应用，并通过了验收，取得了令人满意的效果。     

基于DSP的H.263视频压缩处理信息存取策略研究

结合Ti公司的TMS320C6711DSP的结构特点和ITU-TH．263视频压缩标准的实时性要求，研究了H．263视频压缩编码程序和数据的存取策略，提出实现方案。     

On Design of Parallel Memory Access Schemes for Video Coding

Some of the modern powerful digital signal processors (DSPs) have byte-addressable internal data memory. This property is valuable especially in computationally demanding inter frame video encoding, where data accesses are typically unaligned according to word boundaries. The byte-addressable memory allows load or store command to start accessing from any byte-address, providing at most as many successive bytes from subsequent addresses as data bus can handle in parallel. Maybe the simplest way to construct such a byte-addressable memory is to use N 8-bit memory modules or banks to be accessed in parallel, when N is data bus width in bytes. However, in addition to byte-addressable subsequent bytes, memory consisting of parallel memory modules can provide much more versatile addressing capabilities with reasonable implementation cost. Versatile access formats can significantly reduce the need for data reordering in the register file. At first, we provide motivation for using parallel memory architecture with versatile access formats as an internal on-chip data memory of modern DSP. After this, notations are described and general view of parallel memory design is given. We propose some example parallel data memory architecture designs with data access formats especially helpful in H.263 encoding and MPEG-4 core profile motion and texture encoding. The examples are given for different data bus widths (16, 32, 64, and 128 bits). Finally, performance is shortly compared to other memory architectures and area, delay, and power figures are estimated.Jarno K. Tanskanen was born in Joensuu, Finland in 1975. He studied analog and digital electronics in the Department of Electrical Engineering, and computer architecture in the Department of Information Technology at Tampere University of Technology, where he received his M.Sc. degree in 1999. He is currently working as a research scientist in the Institute of Digital and Computer Systems at TUT. His Dr.Tech. research concerns parallel processing of video compression. jarno.tanskanen@tut.fiReiner Creutzburg received his Diploma in Mathematics in 1976 and attained his Ph.D. in Mathematics in 1984 from the Rostock University, Germany. Prof. Creutzburg has published 3 books, filed 2 patents, and produced approximately 100 articles, preprint, and conference papers. Professional Experience: Since 2000—Part-time Professor for Multimedia technology, Tampere University of Technology, Finland. Since 1992—Full-time Professor of Computer Science, Fachhochschule Brandenburg-University of Applied Sciences, Brandenburg, Germany. 1990 to 1992—Assistant Professor, University of Karlsruhe, Institute of Algorithms and Cognitive Systems, Germany. 1987 to 1989—Head of the Research Section Image Processing. 1986 to 1989—Founder and Head of the International Base Laboratory of Image Processing and Computer Graphics for East European countries at the Central Institute of Cybernetics and Information Processes of the Academy of Sciences (Berlin), Germany. 1976 to 1989—Researcher and Assistant Professor in various Universities and the Academy of Sciences, Central Institute of Cybernetics and Information, Berlin. creutzburg@fh-brandenburg.deJarkko T. Niittylahti was born in Orivesi, Finland, in 1962. He received the M.Sc, Lic.Tech, and Dr.Tech degrees at Tampere University of Technology (TUT) in 1988, 1992, and 1995, respectively. From 1987 to 1992, he was a researcher at TUT. In 1992–93, he was a researcher at CERN in Geneva, Switzerland. In 1993–95, he was with Nokia Consumer Electronics, Bochum, Germany, and in 1995–97 with Nokia Research Center, Tampere, Finland. In 1997–2000, he was a Professor at Signal Processing Laboratory, TUT, and in 2000–2002 at Institute of Digital and Computer Systems, TUT. Currently, he is a Docent of Digital Techniques at TUT and the managing director of Staselog Ltd. He is also a co-founder and President of Atostek Ltd. He is interested in designing digital systems and architectures. jarkko.niittylahti@tut.fi     

视频会议系统多画面软件设计与分析

多画面合成是视频会议中的关键技术.文中对视频数据流的捕获、解码及对任意多.个画面合成的原理进行了分析.给出了采用多画面合成技术来设计视频会议系统的具体方案.该方案具有计算复杂度低、处理速度快、延时小且画面质量高等特点.     

一种基于IP的视频监控系统设计

提出了一种基于IP的视频监控系统设计,阐述了视频编码系统的硬件结构体系和实时视频软件解码系统的设计方案,就视频数据网络传输中的数据处理等关键技术进行了分析。     

Heat Killed Lactobacillus reuteri GMNL-263 Reduces Fibrosis Effects on the Liver and Heart in High Fat Diet-Hamsters via TGF-β Suppression

Obesity is one of the major risk factors for nonalcoholic fatty liver disease (NAFLD), and NAFLD is highly associated with an increased risk of cardiovascular disease (CVD). Scholars have suggested that certain probiotics may significantly impact cardiovascular health, particularly certain Lactobacillus species, such as Lactobacillus reuteri GMNL-263 (Lr263) probiotics, which have been shown to reduce obesity and arteriosclerosis in vivo. In the present study, we examined the potential of heat-killed bacteria to attenuate high fat diet (HFD)-induced hepatic and cardiac damages and the possible underlying mechanism of the positive effects of heat-killed Lr263 oral supplements. Heat-killed Lr263 treatments (625 and 3125 mg/kg-hamster/day) were provided as a daily supplement by oral gavage to HFD-fed hamsters for eight weeks. The results show that heat-killed Lr263 treatments reduce fatty liver syndrome. Moreover, heat-killed Lactobacillus reuteri GMNL-263 supplementation in HFD hamsters also reduced fibrosis in the liver and heart by reducing transforming growth factor β (TGF-β) expression levels. In conclusion, heat-killed Lr263 can reduce lipid metabolic stress in HFD hamsters and decrease the risk of fatty liver and cardiovascular disease.     

AVS编解码技术标准及其在数字视频监控系统上的应用

本文简单介绍了MPEG-4,H.264视频编码技术,主要介绍了我国"数字音视频编解码技术标准工作组"制定的AVS标准,并对上述视频编码技术进行简单的对比。重点讲述AVS标准及其在视频监控系统中的应用。希望通过本文能引起业内的注意,在视频监控中更多地使用AVS视频编码技术,解决目前困扰数字视频监控系统发展的瓶颈。