基于PSTN传输信道的视频编码器码率控制  

Rate Control Scheme of the Video Encoder on the PSTN Channel

作　　者：周兵[1] 李晓强[1] 苏士美[1] 

机构地区：[1]郑州大学信息网络重点开放实验室,河南郑州450052

出　　处：《小型微型计算机系统》2005年第5期810-812,共3页Journal of Chinese Computer Systems

基　　金：国家"八六三"计划项目 (2 0 0 1AA114 14 2 )资助 ;国家自然科学基金 (60 0 75 0 0 6)资助

摘　　要：码率控制是在低带宽信道上传输低延迟、高质量视频的关键技术之一.根据基于PSTN信道的远程视频监控应用需求,提出一种甚低码率控制策略,通过为视频编码器增加I帧码率控制,改进P帧的位率控制算法,以及引入二阶率失真模型,较好地解决了甚低带宽下视频编码器的码率控制问题.实验结果表明,算法降低了编码缓冲区延迟同时提高了重建图像的质量.Rate control is one of critical technologies that are used to transmit low-delay and high-quality images on the channel of very low bandwidth. According to the application demand of remote surveillance system based on PSTN, this paper proposed a rate control scheme of very low bandwidth. The video coder gained good performance at even low bandwidth by adding I-frame rate control and improved P-frame control based on the quadratic rate distortion model. Experiments show that this scheme reduces the delay of encoder buffer greatly, and improves the quality of reconstructed images as well.

关 键 词：MPEG 码率控制 PSNT 二阶模型 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]