一种MPEG-4编码的视频源业务建模  

Traffic Model of MPEG-4 Coded Video Source

作　　者：陶蒙华[1] 黄孝建[2] 沈树群[1] 

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]北京邮电大学电信工程学院,北京100876

出　　处：《小型微型计算机系统》2003年第2期265-268,共4页Journal of Chinese Computer Systems

摘　　要：针对 MPEG- 4的低质量和高质量两种编码质量的视频源 ,给出了一种混合模型 ,此模型在多个时间尺度上反映帧大小的变化 :场景的变化和同一场景内码流的波动 .用几何分布来描述场景的变化 ,用 AR( 2 )模型来反映同一场景内码流的波动 .对 I帧采用合成模型建模 ,对 P,B帧采用几何分布建模 .最后将此模型与不考虑场景变化的几种情况进行了比较 ,并且对它们的排队性能作了分析 。Based on the MPEG-4 video traffic of low quality and high quality, a hybrid model is presented to capture the frame size at multiple time scales: the change of scene and fluctuation of bit-rate.Geometric distribution is used to depict the change of scene and the fluctuation is described by the AR(2) model in the same scene. A composite model is applied to model I frame while Geometric model to model P,B frames. Finally,the model is compared with other models without considering the change of scene and the performace of queue are analyzed.The result proves that the model captures the characterization of video traffic.

关 键 词：MPEG-4 视频源业务建模 视频编码 图像压缩解码 AR(2)模型 场景分布 

分 类 号：TN919.81[电子电信—通信与信息系统] TP391.41[电子电信—信息与通信工程]