视频运动目标检测及跟踪算法测试平台设计与实现

给出了平台构架、设计思路与实现方法,对七个核心算法模块进行了详细说明,给出了采用VC++6.0实现时的主要程序段及技术关键点.提供了一种高速路交通车辆检测和跟踪实例,提供了实例算法结构图、性能参数和实际测试效果.试验结果表明,所提平台具有良好的实时性和有效性.     

Research on tasks schedule and data transmission of video sensor networks based on intelligent agents and intelligent algorithms

As a novel application technology, wireless video sensor networks become the current research focus, especially on target tracking and surveillance scenario. Based on multiple agents'technique, this article introduces a series of intelligent algorithms such as simulated annealing algorithm (SA), genetic algorithm (GA), and ant colony optimization algorithm (ACO) or their mixed algorithms, to resolve the optimization of tasks schedule and data transmission. This article analyzes the performance of abovementioned algorithms and verifies their feasibility associated with agents. The simulations demonstrates that the mixed algorithms based on SA and GA obtain the optimal solution to tasks schedule, and those combined with SA-ACO show advantages on multimedia sensor networks routing optimization.     

Inferring playback rate and rate resets of P2P video streaming transmissions by piecewise line envelope approximation

Conventionally, P2P video is regarded as CBR traffic. However, our measurements have shown that the rate reset cannot be neglected in a practical IPTV system because each rate reset often leads to performance degradation. Thus, addressing the problem of inferring playback rate and rate reset in a P2P video system is significant. In this article, an algorithm termed piecewise linear envelope approximation (PLEA) is proposed, in which a follow-up time is introduced to smooth rate fluctuations in a small time scale and to adapt rate jumps in a large time scale automatically. With the PLEA algorithm, discontinuity introduced by blind segmentations adopted by current methods is avoided. Furthermore, unlike existing algorithms in which both segmentation and combinations are performed in multiple runs, only a single computation path is involved in the PLEA algorithm. This makes PLEA algorithm amenable to implementation of low complexity by either software or hardware. Both theoretical analysis and experiment based on measured data show that the PLEA outperforms existing algorithms based on segmentation.     

支持H．264高清编解码器的片上系统MG3500

MG3500SoC是支持H．264高清编解码器的片上系统,内部集成一个嵌入式ARM926处理器,支持高清H．264编解码、MPEG-2解码和JPEG编解码。介绍了MG3500SoC的主要性能特点、引脚排列、主要接口功能及在DVR上的应用,以及MG3500SoC及其周围器件的硬件设计,提出了在设计中应注意的问题。     

数字水印技术分析及其在电视领域的应用

数字水印是多媒体版权保护的一种有效技术手段。介绍数字水印技术的基本原理,阐述了视频数字水印应具有的特点,讨论压缩域视频数字水印算法。在此基础上,提出数字水印在电视领域的应用方案。该技术为电视版权管理的有效实施具有一定的借鉴作用。     

具有遮挡鲁棒性的目标中心距离加权的跟踪算法

本文提出了一种实时跟踪算法,以目标中心距离加权的目标图像直方图作为模板,采用mean-shift迭代方法进行目标定位;当目标被部分遮挡时,用"分块匹配"的方法提高算法鲁棒性;对于超过一定像素的较大目标,本算法进行"降采样",大大减小运算量,从而实现了对大尺度目标的实时跟踪.实时视频流的实际跟踪系统验证了该方法的有效性.     

采用软件编解码技术和IO通道卡的数字Stream RT视频服务器播出系统

根据数字化进程和节目播出的需要,张家口电视台对原有的3个频道进行了全硬盘播出和数字化改造,分析了该系统的构成,对数据库服务器、视频服务器、控制系统、远程上载系统、数字字幕伺服器作介绍。     

网络化电工电子实验教学系统优化

本文讨论了利用数字化网络视频监控技术和网络化实验装置,设计一种以开放性电工电子实验为基础的实验教学和管理系统.该系统可在开放性实验教学中,用于远程教学,能够规范实验管理,提高实验教学和实验管理水平,并有效地解决了在传统实验中存在的问题.在该系统的开放式实验教学平台上,学生可自主选择实验时间和实验项目,为学生提供了一个适合个性化发展的空间和平台.     

Power Dissipation of the Network-on-Chip in Multi-Processor System-on-Chip Dedicated for Video Coding Applications

In the near future, small electronic hand-held devices will be equipped with digital cameras capable of acquiring high resolution images (HDTV) at real-time rates, resulting in video streams of dozens of megabytes per second. The real-time video decoding and especially encoding of such streams with AVC/ H.264 or SVC standards require a huge amount of computing power that, in the case of a hand-held device, has to be delivered under the constraint of low power dissipation. In this paper we present a Multi-Processor System-on-Chip dedicated for high performance, low-power video coding applications using Network-on-Chip (NoC) as communication infrastructure. Extensive experiments have established the power dissipation models of individual NoC components, i.e. network interfaces, routers and wires. Based on these models and the NoC topology, we build the power model of the complete NoC. For three different implementation scenarios of the AVC/H.264 simple profile encoder we derive the power dissipation of the NoC for image resolutions up to HDTV at rate of 30 frames per second. The results obtained show that for the same application mapping scenario (worst case), moving from CIF to HDTV resolution will result in a 35% increase of the total power dissipation. Finally, for HDTV resolution, the difference in power dissipation between the worst (21 mW) and the best case application mapping scenario is 26%.

聚焦视频交互式多媒体业务：视频交互式多媒体业务研究进展

随着互联网和移动通信网的逐渐普及,视频交互式多媒体业务迅速发展,带来了庞大的市场和产业价值,成为未来通信业务新的增长点。本文首先介绍了国内外视频交互式多媒体业务的开展情况,然后,从共性技术、基础标准．系统标准和系统平台四个方面详细介绍了视频交互式多媒体业务的技术体系。近年来视频交互式多媒体业务技术变化日新月异,新技术层出不穷,极大地提高了业务的服务质量。本文最后着重介绍了视频交互式多媒体业务中的虚拟现实技术、视频转码技术、多媒体检索技术及最新技术进展及其给视频交互式多媒体业务所带来的变化。