浅谈视频会议系统的运行与维护

视频会议是一种新兴的虚拟会议形式,主要是通过现代计算机通讯技术来实现的,视频会议中,参会人员要通过视频信息和音频信息的网络传递来进行交流沟通。会议期间,参会人员还可以相互分享信息资源,视频会议极大的促进了会议的效率。同时也为参会人员带来了很多方便。要进行视频会议,需要专门的系统作为依托,而视频会议系统在运行过程中难免会出现一些问题,对此,本文探析视频会议系统的运行与维护,为有关工作提供参考。     

大庆油田高清视频会议系统建设方案

通过建设大庆油田统一的高清视频会议系统,可为油田各单位提供高清、实时、交互的沟通协作平台。本文介绍了大庆油田高清视频会议项目的背景和现状,并论述了系统建设方案。     

试论视频会议系统结构和平台选择

在当今社会，利用WEB开展视频会议是最具潜力和最具应用基础的模式。本文通过对视频会议系统的特点，选择适合的结构与平台使用户无需安装视频会议客户端软件，直接就可以利用WEB浏览器来进行多方语音和视频交流。     

如何在视频会议集成中灵活应用各种类型话筒

要实现高质量的视频会议系统，产品的哪个特性最重要？多数人大概都会说一流的视频信号体现，然而情况并非如此。目前对于视频会议的直观效果来讲，好的音频表现仍然是最重要的。因为与会者之间重要信息的交流通常是通过对话和讨论实现的。具备出色的音频系统与好的视频系统同样重要。     

视频会议系统探析

本文首先介绍了视频会议的发展状况，和组成视频会议系统的几个部分，接着总结了现在常用的视频会议的类型，最后分析了影响视频会议效果的几个主要因素，并提出获得高质量会议视频效果的措施。     

电力系统中高清视频会议系统的应用研究

在网络技术的发展中,越来越多的企业开始使用视频会议系统。在增加视频会议的同时,也提高了对电力系统的要求。为了达到视频会议要求,视频会议系统已经从标清视频升级为高清视频。高清型视频会议系统具有较多的优势,逐渐得到广泛应用。本文主要介绍了高清视频会议系统的结构、设备和应用优势,并研究电力系统中高清视频会议系统的主要应用。     

IP视频会议系统的研究与应用

本文从视频会议的概述出发，介绍了视频会议系统的组成及其关键技术，在次基础上，讨论了QoS的策略与实现以及确保OoS的具体方法。由此可见，IP视频会议系统有很好的应用前景。     

浅析视频会议系统设计基础

在互联网应用高速发展的当今社会，利用WEB开展视频会议足最具潜力和最具应用基础的模式。本文选用的系统设计为完全基于IE浏览器、通过纯软件实现的一套视频会议系统。通过对系统特点的分析，找到系统设计的基础，从而使用户无需安装视频会议客户端软件，直接就可以利用WEB浏览器来进行多方语音和视频交流。     

中国石油视频会议系统的建设与发展

视频会议的发展1.视频会议与电视会议视频会议是通过终端与网络,使身处异地的与会者就同一议题参与讨论,相互之间不仅可以听到发言者声音、图像及背景,同时还可以进行数据、文字、图表的交流。它利用视频、音频压缩技术及点到点或点到多点的通信规程、帧同步控制和指示信号等技术设备,通过不同的传输信道进行码流的传送。通常把视频会议也称为会议电视。其实,视频会议只是电视会议最主要的应用领域,会议电视还包括远程教育系统、远程监控系统、视频点播以及电子商务等。视频会议系统在用户组成模式上分为点对点和群组视频会议系统,按技术实…     

标准化视频会议室的构建方案

为认真贯彻落实《十八届中央政治局关于改进工作作风、密切联系群众的八项规定》,省局（公司）出台具体实施办法,要求一般采用电视电话会议的形式召开各种专业性会议,然而原有视频会议系统存在的一些问题,在一定程度上影响了视频会议系统的使用效果。为此,温州烟草根据自身工作实际,通过深入研究和分析视频会议室建设标准,构建了标准化视频会议室,并取得了初步效果。     

蒸汽管网的智能监测系统

利用正常蒸汽管网的实测数据作为神经网络学习样本,通过神经网络的学习不断调整通过传热理论建立的正常管网传热模型中的温度分布系数,由此建立一个逼近实际蒸汽管网模型的传热模型,并以此作为蒸汽管网的诊断系统的诊断标准.再结合数据采集系统和对管网实时运行状况模拟和故障报警系统,组成蒸汽管网的智能监测系统.最后,用VC编程实现了该系统.     

IGM‐based perceptual multimodal medical image fusion using free energy motivated adaptive PCNN

Multimodal medical image fusion merges two medical images to produce a visual enhanced fused image, to provide more accurate comprehensive pathological information to doctors for better diagnosis and treatment. In this article, we present a perceptual multimodal medical image fusion method with free energy (FE) motivated adaptive pulse coupled neural network (PCNN) by employing Internal Generative Mechanism (IGM). First, source images are divided into predicted layers and detail layers with Bayesian prediction model. Then to retain human visual system inspired features, FE is used to motivate the PCNN for processing detail layers, and large firing times are selected as coefficients. The predicted layers are fused with the averaging strategy as activity level measurement. Finally, the fused image is reconstructed by merging coefficients in both fused layers. Experimental results visually and quantitatively show that the proposed fusion strategy is superior to the state‐of‐the‐art methods.     

品牌视觉识别系统的建构

本文论述了在建构品牌视觉识别系统时,在运用品牌视觉识别系统中要注意和考虑的重要因素,使建构品牌视觉识别系统时采取更加科学、更加合理,正确而全面的方法.     

Visual Prostheses: Technological and Socioeconomic Challenges

Visual prostheses are now entering the clinical marketplace. Such prostheses were originally targeted for patients suff ering from blindness through retinitis pigmentosa(RP). However, in late July of this year, for the first time a patient was given a retinal implant in order to treat dry agerelated macular degeneration. Retinal implants are suitable solutions for diseases that attack photoreceptors but spare most of the remaining retinal neurons. For eye diseases that result in loss of retinal output, implants that interface with more central structures in the visual system are needed. The standard site for central visual prostheses under development is the visual cortex. This perspective discusses the technical and socioeconomic challenges faced by visual prostheses.     

O fly,where art thou?

In this paper, the design of a real-time image acquisition system for tracking the movement of Drosophila in three-dimensional space is presented. The system uses three calibrated and synchronized cameras to detect multiple flies and integrates the detected fly silhouettes to construct the three-dimensional visual hull models of each fly. We used an extended Kalman filter to estimate the state of each fly, given past positions from the reconstructed fly visual hulls. The results show that our approach constructs the three-dimensional visual hull of each fly from the detected image silhouettes and robustly tracks them at real-time rates. The system is suitable for a more detailed analysis of fly behaviour.     

面向轨道装备的可视化人因综合仿真分析平台研究

目的提出一个集研究作业人员行为、作业设备和作业环境于一体的可视化人因综合仿真分析平台,为轨道装备设计方案提供直观可视、可重复的人体工程学评估手段。方法通过研究分析行为观察系统、运动捕捉系统、肌电测试系统、JACK虚拟人仿真系统和CAD设计及建模系统的功能及匹配性,构建能将真人作业虚拟化,能对虚拟动素进行评估,能对设计方案进行可视化人因适配分析,能生成虚拟人作业数据等功能的可视化人因综合仿真分析平台,并用案例论证了该平台的有效性。结论该平台适合用于轨道车辆、一些大型装备及相关工作空间设计方案的人体工效学评估。     

New human visual system model and its application for designing image transmission systems

The advantage of the new human visual system model consists in its ability to take visual system properties into account more accurately. Because of this, it guarantees close agreement between subjective image impairment assessment on the one hand, and estimations obtained by this model on the other. This fact gives good grounds to exclude the human observer of the iteration process of parameters optimization for television equipment to be developed.     

多视觉传感器CAN总线检测系统的设计

研究了多传感器CAN总线视觉检测系统的架构方式与设计方法,给出了视觉传感器的控制电路单元CAN总线控制方法,多路视频信号切换开关单元的信号切换方法,CAN总线控制网络通讯的软件设计.文章介绍的CAN总线控制系统实现了多视觉传感器的分布式网络化控制,尤其适合对实时性、可靠性和精度等要求较高的大型多传感器视觉测量系统的实时控制.     

Local image statistics: maximum-entropy constructions and perceptual salience

The space of visual signals is high-dimensional and natural visual images have a highly complex statistical structure. While many studies suggest that only a limited number of image statistics are used for perceptual judgments, a full understanding of visual function requires analysis not only of the impact of individual image statistics, but also, how they interact. In natural images, these statistical elements (luminance distributions, correlations of low and high order, edges, occlusions, etc.) are intermixed, and their effects are difficult to disentangle. Thus, there is a need for construction of stimuli in which one or more statistical elements are introduced in a controlled fashion, so that their individual and joint contributions can be analyzed. With this as motivation, we present algorithms to construct synthetic images in which local image statistics--including luminance distributions, pair-wise correlations, and higher-order correlations--are explicitly specified and all other statistics are determined implicitly by maximum-entropy. We then apply this approach to measure the sensitivity of the human visual system to local image statistics and to sample their interactions.     

基于谱质心直方图-SVM的滚动轴承故障诊断

轴承早期故障信号的信噪比较低,较难识别。为提高轴承早期故障诊断的准确率,分析了现有方法和视觉信息处理方式的相似点,从视觉信息处理的角度进行研究,提出一种基于谱质心直方图的滚动轴承故障特征提取方法,将所提出方法用于滚动轴承不同运行状态下的故障特征提取,将所提取特征作为支持向量机的输入特征向量从而实现对滚动轴承不同运行状态的智能分类。实验证明,谱质心直方图提高了轴承早期故障诊断准确率,准确率平均提高了2 %,优于Mel频率倒谱系数特征。