省略B帧运动补偿的转码算法实现 MPEG-2到MPEG-4视频流转码

MPEG-2和MPEG-4作为最流行的通用编码国际标准,将长期并存于不同的系统和网络服务中.为实现不同视频系统和网络间对以上两种压缩标准的兼容性,本文在详细分析它们压缩算法运算复杂度的基础上,提出三种压缩视频流转码算法.重点讨论了两种高性能转码算法的原理与实现过程,它们均是运算复杂性和视频质量之间的折衷方案:一是针对演播室和后处理环境的最高目标视频质量要求的运动参数重用算法;另一个是针对网络服务器和用户终端系统处理性能有限,具有最小延时要求的实时低复杂度转码算法.大量测试序列的仿真结果证明了算法的良好性能.

Omit Motion Compensation of B-pictures Algorithm for MPEG-2 to MPEG-4 Video Transcoding

Abstract:MPEG-2 and MPEG-4 are two most popular international video compression standards.They will coexist in different systems and networks for a long time.For compatibility of these two video standards,this paper put forward three transcoding algorithms on the basis of detailed analysis of computational complexity.In the paper,the principle and implementation of two efficient transcoding algorithms are emphasized.Both of them are compromise between the computational complexity and reconstructed video quality.One is motion-information reusing algorithm,which meets the highest video quality requirement of studio.The other is real-time low complexity transcoding algorithm,which applies to lowest delay requirement of the network server and user terminal with limited computational performance.The simulation results of many test sequences testified the excellent performance of the algorithms.