H.264 SVC快速模式选择算法

摘要

To reduce the computational complexity of scalable video coding（SVC）,a novel fast mode decision algorithm for H.264 scalable video coding is proposed.First,according to the analysis of mode occurrence frequency and conditional probability,the frequently occurred modes were examined at priority.If both the local-optimal condition and the monotony of rate-distortion cost condition were satisfied,the mode search process was terminated.Moreover,the candidate modes were selected based on the inter-layer mode correlation and the not suitable modes were eliminated.Comparing with the full mode search method,the proposed method accelerates the coding speed remarkably with negligible loss of quality and bit-rate.%为了减小可伸缩视频编码（SVC）的编码复杂度,提出了一种H.264 SVC快速模式选择算法.通过分析SVC各编码模式的使用频率和条件概率情况,对出现概率高的模式进行优先搜索,当满足局部最优和率失真代价单调性条件时,提早结束模式搜索.同时,利用层间模式相关性,除去不适用的模式.缩小候选模式搜索范围.实验结果表明,与模式全搜索方法相比,本文算法在图像质量和码率损失极小的前提下,编码速度显著提高.