摘要
提出了一种H.264快速多参考帧选择算法,它利用视频序列的空间相关特性,在运动估计之前判断当前宏块的Skip编码模式,实现在运动估计过程中快速选择编码模式,基于对Skip编码模式占用概率的统计分析,设置多模式下参考帧数量。实验结果表明,本算法在PSNR损耗与全搜索算法相比不超过0.07dB的情况下,平均节约72.5%的编码时间。
A fast multiple reference frame selection algorithm was proposed for a H.264 encoder to compute the optimal reference frame number.According to the spatial correlation in natural videos,the current macro block’s Skip mode was determined before performing the motion estimation in terms of the information from its adjacent macro block coding mode.A fast inter frame selection model algorithm was presented to improve the efficiency of motion estimation.Based on the probability characteristics of the Skip mode in the sequence,the optimal reference frame number was obtained for fast motion estimation.Experiments show that the proposed algorithm can reduce the average encoding time up to 72.5% with the average PSNR degradation no more than 0.07dB.
出处
《通信学报》
EI
CSCD
北大核心
2010年第7期40-45,共6页
Journal on Communications
基金
国家高技术研究发展计划("863"计划)基金资助项目(2008AA01A315)
河南省高校杰出人才创新工程基金资助项目(2005KYCX003)~~
