空间可分级视频编码的层间预测新算法

针对可分级视频编码中图像输出质量与编码所需时间的权衡问题，提出了一种可行的层间预测算法.该算法结合空间可分级的层间结构特点，充分利用基本层宏块及其邻域宏块的备选模式，依据其统计规律计算当前增强层待编码宏块可能的最优备选模式，有效地减少参与运动估计运算的模式数量，以达到降低编码时间的目的.通过JSVM的仿真实验，该层间预测算法与传统的层间预测算法相比，在输出图像质量变化较小的前提下，能够大幅降低编码时间，提高编码效率.

A novel inter layer prediction algorithm for spatial scalable video coding

In order to solve the tradeoff problem between the image output quality and encoding time in scalable video coding, a feasible inter layer prediction algorithm was proposed. Through combining the characteristics of spatial scalabe inter layer structure and utilizing the alternative modes of macroblocks both in the base layer and its neighbour area, the possible optimum alternative mode of macroblocks to be coded in the current enhancement layer was calculated with the proposed algorithm according to the statistical rule. The mode quantity involved in the motion estimation calculation gets effectively reduced, and thus, the goal of reducing the coding time is achieved. The simulated experiments on JSVM show that compared with the traditional inter layer prediction algorithms, the proposed inter layer prediction algorithm can substantially reduce the encoding time and improve the coding efficiency with samller change in the image output quality.