动力环境及视频集中监控系统构建

为实现全网机房的集中维护管理,必须建立一套完善的动力环境及视频集中监控系统,结合陕西广电网络的实际情况,阐述了动力环境及视频集中监控系统的结构和功能,可实现监控对象的集中控制、维护和管理,提高整个系统的可靠性和设备的安全性。     

Human perception-based distributed architecture for scalable video conferencing services: theoretical models and performance

This research work proposes a human perception-based distributed architecture for the multiparty video conferencing services. The new architecture can effectively reduce the unnecessary traffic of the multilayer video streams on the overlay network. Rich theoretical models of the three different architectures: the proposed perception-based distributed architecture, the conventional centralized architecture, and perception-based centralized architecture have been constructed by using queuing theory to reflect the traffic generated, transmitted, and processed by the three architectures. The performance has been considered in different aspects from the total waiting time to the required service rates. Together, the modeling tools, the analysis, and the numerical results help to answer the common concern about advantages and disadvantages of the centralized and distributed architectures. Overall, the proposed human perception-based distributed architecture can maintain a smaller total waiting time with a much smaller requirement of service rate in comparison with the conventional centralized architecture and perception-based centralized architecture.     

基于广电特色的视频会议集控系统

主要阐述了海盐县广播电视台对海盐县大剧院原有的视频会议系统进行的改造调整,并由此形成了一个完善的视频集控会议系统.调整后的视频会议系统极大提高了链路的稳定性,改善了视频图像质量,并且考虑到了安全因素的问题,取得了良好的社会效益和经济效益.在此基础上,所积累的经验,特别是专线视频会议的整合及升级等方面,供同行参考.     

电网统一视频监控平台分布式部署架构研究与实现

在提升视频监控信息资源共享利用水平的同时,电网统一视频监控平台系统及网络负载均不断提高。本文分析了电网统一视频监控平台集中式部署关键性能影响因素,并通过分布式部署解决了多用户并发访问、视频接入量扩大给系统带来高负载、大视频量问题,为系统的深化应用及后续扩大视频点接入提供了保障。     

一种基于FPGA的实时视频采集与远程传输系统

以FPGA器件XC5VLX110T作为核心,选用芯片AD9980进实时视频采集,扩充大容量DDR2 SDRAM作为系统运算缓存,内置TEMAC控制器建立以太网通信链路,配置软核处理器MicroBlaze管理各模块,并设计配套软件,构成一种功能强大的视频采集板卡,并支持组网集中管理.     

“去电信化”融合视频通信产品方案分析

从网络实现架构、业务开通方式、功能、可靠性、接入协议、号码、QoS、终端、与现有业务的互通性等多方面对互联网模式的视频通信和运营商实现的IMS视频通信进行了详细对比分析,提出了"去电信化"是影响运营商视频通信业务成功的关键要素,即终端非定制化、体系架构开放化、管理流程互联网化、部署集中化、运营集约化等,并在此基础上,对运营商如何提供融合视频通信的产品实现方案、产品形态以及推广策略给出了初步建议。     

基于4G无线传输的视频应用体系的研究与分析

本文在介绍TD-LTE移动通信技术的基础上,从TD-LTE的定义和技术特点等方面浅析了4G技术在视频业务上的拓展功能,阐述了4G视频监控平台的技术架构,研究与分析了基于4G的视频监控系统的优势和对视频应用体系的影响,并对未来视频的功能业务发展趋势进行了研究及探讨,同时细化了如何在大数据时代将云计算、数据中心统一在集中式监控平台上运营,最后再通过结合多个视频应用场景对当前的视频监控业务市场进行了分析。     

Maximizing the number of users in an interactive video-on-demand system

Video prefetching is a technique that has been proposed for the transmission of variable-bit-rate (VBR) videos over packet-switched networks. The objective of these protocols is to prefetch future frames at the customers' set-top box (STB) during light load periods. Experimental results have shown that video prefetching is very effective and it achieves much higher network utilization (and potentially larger number of simultaneous connections) than the traditional video smoothing schemes. The previously proposed prefetching algorithms, however, can only be efficiently implemented when there is one centralized server. In a distributed environment there is a large degradation in their performance. In this paper we introduce a new scheme that utilizes smoothing along with prefetching, to overcome the problem of distributed prefetching. We show that our scheme performs almost as well as the centralized prefetching protocol even though it is implemented in a distributed environment. In addition, we introduce a call admission control algorithm for a fully interactive video-on-demand (VoD) system that utilizes this concept of distributed video prefetching. Using the theory of effective bandwidths, we develop an admission control algorithm for new requests, based on the user's viewing behavior and the required quality of service (QoS).     

IPv6视频监控系统的实现与奥运创新应用

随着信息通信宽带产业的发展,视频多媒体应用已普遍得到电信运营商的重视,并将其作为重点转型业务之一。目前视频监控市场正由行业专业监控向社会公共领域及家庭个人普及,以及由分散分割的监控专网向大规模部署、集中管理的运营级公众服务方向发展,视频监控已越来越得到广泛应用。本文结合中国下一代互联网总体发展目标,论述了基于IPv6的视频监控系统的技术研发、实现方案和应用情况。     

中心式VOD视频点播系统及其关键技术实现

介绍了一种基于IP骨干网的中心式VOD视频点播结构，并与分布式结构进行了比较，指出了它的主要优缺点。讨论了中心式VOD系统所面临的若干关键技术，最后简述了VOD over IP的操作过程。     

Federated learning based intelligent edge computing technique for video surveillance

With the explosion of global data,centralized cloud computing cannot provide low-latency,high-efficiency video surveillance services.A distributed edge computing model was proposed,which directly processed video data at the edge node to reduce the transmission pressure of the network,eased the computational burden of the central cloud server,and reduced the processing delay of the video surveillance system.Combined with the federated learning algorithm,a lightweight neural network was used,which trained in different scenarios and deployed on edge devices with limited computing power.Experimental results show that,compared with the general neural network model,the detection accuracy of the proposed method is improved by 18%,and the model training time is reduced.     

Collaborative resource exchanges for peer-to-peer video streaming over wireless mesh networks

Peer-to-peer collaboration paradigms fundamentally change the passive way wireless stations currently adapt their transmission strategies to match available resources, by enabling them to proactively influence system dynamics through exchange of information and resources. In this paper, we focus on delay-sensitive multimedia transmission among multiple peers over wireless multi-hop enterprise mesh networks. We propose a distributed and efficient framework for resource exchanges that enables peers to collaboratively distribute available wireless resources among themselves based on their quality of service requirements, the underlying channel conditions, and network topology. The resource exchanges are enabled by the scalable coding of the video content and the design of cross-layer optimization strategies, which allow efficient adaptation to varying channel conditions and available resources. We compare our designed low complexity distributed resource exchange algorithms against an optimal centralized resource management scheme and show how their performance varies with the level of collaboration among the peers. We measure system utility in terms of the multimedia quality and show that collaborative approaches achieve ~50% improvement over non-collaborative approaches. Additionally, our distributed algorithms perform within 10% system utility of a centralized optimal resource management scheme. Finally, we observe 2-5 dB improvement in decoded PSNR for each peer due to the deployed cross-layer strategy     

构建互联网视听节目集中监管平台的探索和设想

随着互联网技术的发展,互联网视听节目的传播手段、内容、形式也发生了巨大变化。在监管系统建设构成中针对不同的传播方式,适时建设相应的专项监管系统,多个功能专一的监管系统,给使用和信息的互联互通带来很多不便,造成工作效率低,信息资源不能充分发挥作用。针对广电系统内视听节目监管系统存在的问题以及缺乏全局的、系统化的解决方案的现状,提出构建互联网视听节目综合的集中监管平台,主要是建设“互联网视听节目信息资源库”,以及“监管数据集中分析处理系统”和“监管业务集中处理系统”两个系统,实现对各类海量视听节目数据快速分析处理,更加准确地掌握各类视听节目网络传播的数量、动态、范围、影响等情况,综合提升舆情分析能力,提高监管效率。     

WiFace: A Secure Geosocial Networking System Using Wi-Fi Based Multihop MANET

A number of mobile Online Social Networking (OSN) services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastructure is not always available. Nor are location-based services offered to mobile devices without GPS. To take advantage of cloud and to address these problems, a Wi-Fi based multihop networking system called MoNet is proposed. On top of MoNET we propose a privacy-aware geosocial networking service called WiFace. Where there is no infrastructure, a distributed content sharing protocol significantly shortens the relay path, reduces conflicts, and improves data availability. Furthermore, a security mechanism is developed to protect privacy. Comprehensive experiments performed on MoNet show that the system is more than sufficient to support social networking and even audio and video applications.     

WCDMA网络集中监测系统中3G-H324M议监测方案研究

在介绍WCDMA集中监测系统的设计架构和功能的基础上,结合对3G-H324M协议栈和可视电话呼叫流程的深入分析,创新性的提出了一种在WCDMA网络集中监测系统中3G-H324M协议监测的设计方案,通过现网测试,效果良好.     

视音频切换器集中控制系统的设计与实现

基于视音频切换器提供的串口通信协议,通过协议分析,利用V isual Basic 6.0提供的MSComm通信控件,实现了计算机对多台切换器进行电视信号切换操作的集中控制,并对系统软件开发过程中的重要控件以及核心代码作了详细说明。     

一个分层的实时视频传输系统模型及其实现

本文提出了一个分层的实时视频传输系统模型CRR.在CRR中,作者设计了一个高效的应用级的Multicast协议RTMTP,利用逻辑时钟和缓冲队列的处理保证视频传输的实时性;加入了分层的反馈-调整机制以改进对网络流量的管理,避免了传统模型中集中处理、灵活性较差的流量控制;通过Repeater实现了QoS的层次化,还解决了Multicast报文的转发问题.最后介绍了CRR模型的实现技术,测试了基于该模型的实例系统Virtual Lab的性能.     

Rateless scalable video coding for overlay multisource streaming in MANETs

Recent advances in forward error correction and scalable video coding enable new approaches for robust, distributed streaming in Mobile Ad Hoc Networks (MANETs). This paper presents an approach for distribution of real time video by uncoordinated peer-to-peer relay or source nodes in an overlay network on top of a MANET. The approach proposed here allows for distributed, rate-distortion optimized transmission-rate allocation for competing scalable video streams at relay nodes in the overlay network. The approach has the desirable feature of path/source diversity that can be used for enhancing reliability in connectivity to serving nodes and/or attaining a higher throughput. The distributed approach reduces signaling overhead as well as avoiding scalability issues that come with centralized processing in MANETs. Results show a significant performance gain over both single-server systems and previously proposed multi-source systems.     

Distributed interactive video system design and analysis

The interactive video (IV) market has been expected to capture a significant share of the huge potential revenues to be generated by the business and residential markets. The level of revenues generated depends on the completion rate of calls the service provider can support, no matter what the IV system or network condition. Thus, a cost-effective, scalable fault-tolerant IV system is needed to maximize the video call completion rate at an affordable cost. This article describes design methodologies for a scalable, fault-tolerant IV system and an IV system design and analysis research prototype called IVSDNA (IV System Designer and Analyzer). The IVSDNA prototype is designed to help network planners and engineers to evaluate quantitative trade-offs (in terms of network communications costs, video storage costs, and degree of system fault tolerance) between two major IV system architectures (centralized and distributed) with a variety of video distribution methods, replication strategies, and fault-tolerant access protocols     

A cost comparison of distributed and centralized approaches tovideo-on-demand

With video-on-demand (VoD) regarded as one of the drivers for the deployment of broadband integrated service digital networks (B-ISDNs), an important issue is how to provide wide area VoD services most efficiently. A large contributor to the cost of a VoD system is storage. The nature of the service requires massive amounts of storage and bandwidth to be supplied from a video server located within the network. We examine the costs of storage in such servers and develop an efficient allocation scheme designed to minimize this cost. Using this scheme, centralized and distributed approaches to VoD are compared. We conclude that a distributed approach to storage costs no more than a centralized approach and offers considerable advantages in terms of bandwidth requirements and service quality