协同设计工具中视频数据的多方传输

视频工具是协同设计环境下人－人交互的重要手段之一，为了支持群体工作，视频工具应该具有多方和多路视频的特征，这将使普通视频工具原本存在的网络带宽资源占用量大的问题表现的尤其突出，基于ｍｕｌｔｉｃａｓｔ传输，提出一种混合式的数据处理与传输方法，使系统中视频数据的网络带宽占有量明显下降，并且为视频源数据流引入了自适应控制机制，根据网络负载大小调整视频的充理，使视频流的质量和网络带宽分配达到折中，另外，采

VIDEO DATA MULTIPARTY TRANSMISSION IN COOPERATIVE DESIGN TOOL

The video tool is one of the essential means in cooperative design environment. In order to support group work, the video tool should possess the characteristics of multiple parties and multiple views. This feature will enlarge very much the problem for the occupation of large volume network bandwidth resource, which exists originally in ordinary video tools. Based on multicast transmission, a hybrid data processing and transmission method is put forward, which makes the occupation of network bandwidth for video data decreased distinctly. And an adapted control engine is introduced for source video stream, which can adjust the size of video data stream according to the load on network in order to compromise between the quality of video and the allocation of network bandwidth. Besides, we adopt the centralized strategies to allocate and reserve the network bandwidth resource and to make the video data higher priority, in order to guarantee the transmission of the real time video continuously on LAN.