视频会议系统中一种基于FLC的流控策略

在Ｉｎｔｅｒｎｅｔ视频会议应用中，必须对注入网络的视频流量进行控制以避免网络拥塞。文中针对Ｈ。２６３视频编码器，提出一种基于模糊逻辑控制（ＦＬＣ）的速率控制机制，将视频的编码长度信息通过ＦＬＣ映射至编码器的量化系数，调节下一帧的码流长度，在保证通信的连续性和图像质量的前提下使编码器的输出码率明显地降低，尽可能地避免网络拥塞。文中具体描述了这种拥塞避免机制，最后给出了实验结果，结合与相关拥塞避免策略

A FLOW CONTROL SCHEME BASED ON FLC FOR VIDEOCONFERENCING SYSTEM

For the Internet videoconferencing applications, the rate of video flow to network must be controlled to prevent the network from congestion. A rate control scheme based on fuzzy logic control(FLC) is brought forward in this paper, in which the compressed code length is mapped into coefficients of quantizer used in the video coder to adjust the compressed code length of next video frame. By using this scheme, the code rate output of the coder can be reduced apparently on the basis of communication continuity and image quality guarantee to avoid the network congestion. The scheme of congestion avoidance is described in detail. Experimental results are shown and a simple performance evaluation is presented by comparing the scheme with relative congestion avoidance mechanism.