无线视频传输中MPEG-4自适应分包算法  

Adaptive Packetization of MPEG-4 Visual Stream in Wireless Transmission

作　　者：许呙兢[1] 罗志祥[1] 曹明翠[1] 

机构地区：[1]华中科技大学光电子科学与工程学院,武汉430074

出　　处：《计算机工程》2007年第18期242-244,275,共4页Computer Engineering

摘　　要：MPEG-4视频流在无线信道中传输时,视频数据必须符合一定的结构,以便当信息丢失和比特错误时,能够进行差错控制。将视频净载荷按一定结构进行适当分组的处理称为打包或者分包。该文对分包的理论模型进行了分析,提出了一种兼顾封装效率和图像质量的自适应分包算法,并利用实时传输协议在GPRS无线信道中进行传输,取得了理想的视觉效果。When the MPEG-4 visual stream is transferred in wireless channel, the visual data must be in accordance with certain structure for better error control when the bit error happens. The grouping of the payload of the visual： data according to certain structure is called as packetization. The model of the pac^etization is analyzed and an algorithm of adaptive packetization based on both encapsulation efficiency and video quality is proposed. Experiments using real-time transport protocol over GPRS （general packet radio services） network are used to validate the analysis of the most efficient scheme.

关 键 词：MPEG-4 分包 有效误码率 实时传输协议 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]