摘要
为了使当前“尽力而为”的网络提供视频流服务时满足QoS要求 ,文章提出一种基于小波EBCOT的图像IP网络传输控制策略 .通过采用基于小波EBCOT的渐进可分级编码方法 ,对压缩后的比特流按其重要性分层打包传输 ,同时根据对当前网络可用带宽的估计及信道状态的判断 ,区分网络拥塞及不可靠传输两种不同情况进行自适应不等重丢包保护AUPLP .软件仿真表明 ,该文算法可大大增强小波EBCOT编码后数据的抗误码能力 ,在发生数据拥塞时有助于缓解网络的过负载状况 ,在发生不可靠传输时接收端解码图像能平均提高 1.2dB的PSNR .
In order to meet the requirements of QoS to transmit video streaming over present best effort network, a new streaming video transmission and controlling strategy based on wavelet EBCOT coding over IP network is proposed in this paper. The strategy analyzes the bit streams encoded by EBCOT and them into multiple transmission layers according to different importance, then applies unequal packet loss protection to them according to the network bandwidth estimation and channel state. The experimental results show that the proposed scheme can highly improve the error resilience of the bit stream, as well as efficiently relieve the IP network congestion, and it can obtain up to 1.2dB in PSNR when the transmission is unreliable.
出处
《计算机学报》
EI
CSCD
北大核心
2004年第2期264-269,共6页
Chinese Journal of Computers
基金
国家自然科学基金 (60 3 72 0 43 )资助
