基于网络带宽非均匀划分的可分级码流无缝切换方法  

A Seamless Switching Method of Scalable Video Bitstream Based on UIB

作　　者：张建龙[1] 高新波[1] 杜建超[2] 李云松[2] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071 [2]西安电子科技大学ISN国家重点实验室,西安710071

出　　处：《计算机学报》2007年第5期845-850,共6页Chinese Journal of Computers

基　　金：国家自然科学基金(60202004)资助

摘　　要：提出了一种新的基于无缝切换技术的可分级码流切换方法.首先建立了可分级码流的不等份带宽划分模型.在此基础上,按照对网络拥塞影响的重要性,将视频服务器的向上切换和向下切换分别处理,另外结合网络带宽的平均变化特性和瞬时变化特性,判断码流如何切换.实验表明文中方法能够更好地适应网络带宽变化,降低网络拥塞,提高图像质量的平滑性,平均PSNR比简单的无缝切换方法高0.4dB.A novel seamless switching method of scalable video stream is presented. Firstly, a mathematics model with unequal interval of bandwidth is established by the character of scalable video bitstreams. The video server processes the request of switching up and switching down differently based on seamless switching and this model, with different effect on network congestion. Then switching is judged according to the average variation and instantaneous variation of bandwidth. Simulation results show that this scheme can gain about 0.4dB in PSNR compared with the simple seamless switching method. Adapting to network are improved rapidly.

关 键 词：可分级 无缝切换 不等带宽划分(UIB) 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]