重用运动矢量和预测残差的MPEG-2/H.264空间分辨率转码

Reuse of Motion Vector and Predictive Residue for MPEG-2 to H.264/AVC Spatial Downscaling Video Transcoding

本文提出一种新的MPEG-2到H.264的视频转码算法.它通过充分利用MPEG-2解码过程中得到的运动矢量和宏块编码残差等信息,可显著减少H.264编码过程中宏码编码模式确定和运动估计过程的计算复杂度,并得到最终的H.264视频流.几种典型视频测试序列的仿真实验结果表明,本算法对视频质量的损失较小,有稳定的率失真性能,有利于实时转码的实现.

In this paper, a novel scheme, which is based on the reuse of motion vector and prediction residues, is proposed for MPEG-2 to H. 264/AVC spatial downscaling video transcoding. It full utilizes the motion vectors and predictive residues gathered in MPEG-2 decoding to greatly decrease the computational complexity of macroblock coding model decision and motion vector re-estimation in H. 264, and generates the H. 264 bit streams. Simulation results on several video test sequences demonstrate that the proposed approach can significantly reduce the computational complexity of the transcoder with just slight sacrificing the rate-distortion performance, which does benefit to real time transcoding.