大规模视频会议中的多人桌面共享系统的设计与实现

Research and Implementation of a Multipoint Desktop Share System in Large Scale Video Conference

桌面共享是数据共享中的一种重要应用,在视频会议中经常用于文档展示、操作演示、问题协同解决等,是音视频、文本消息等交互方式的重要且有效的补充。AT&T剑桥实验室开发的虚拟网络计算软件VNC是一个强大的远程桌面共享工具,能够让多个用户通过复杂的互联网环境实时观看到远端的服务器桌面并进行操作。然而VNC系统的星型结构在实际应用中很容易造成服务器端网络的拥塞,使得可用性大大降低。本文在兼容原有VNC系统基础上,提出了VNC网关模型,将VNC和Admire视频会议系统进行了应用整合,增加了安全性并大大提高了实际用户容量,已经在Admire系统中得到了良好的应用。

Desktop Share is an important application in data share field and often used in remote document presentation, operation demostration, collaborative troubleshooting, etc. It is an effective supplement of other interaction ways such as video/audio and instant message. VNC （Virtual Network Computing） is a powerful remote desktop share tool developed by AT＆T Cambridge Lab. With the help of VNC, users can access to the remote server and make operations via internet. In this paper, a VNC Gatewaymodel is described. VNC Gateway transfers the computing and bandwidth bottleneck to special server, increases the capability of concurrent user amout and has been well used in Admire system.