SVC空域增强层快速运动估计算法

Fast motion estimation algorithm in spatial enhancement layer based on SVC

基于分级编码空域增强层运动估计的特点,提出了一种增强层快速运动估计算法.该算法利用基本层信息产生增强层无残差预测运动估计的整像素SAD门限,由该门限对是否进行基于残差预测的运动估计进行终止判决,由此使大量的编码宏块避免了不必要的基于残差预测的运动估计.并且对基于残差预测的运动估计,直接在层间预测模式下,以层间预测矢量为预测值进行运动估计,进一步加快了编码速度.实验结果表明,该算法在保持信噪比几乎不变的同时,使增强层的运动估计时间比原联合编码模型减少了35%,从而降低了编码器的运算复杂度.

Based on the analysis of the characteristics of motion estimation in the spatial enhancement layer, a new algorithm is proposed. The algorithm estimates the prediction threshold of pixel SAD with the information from the base layer. It makes a decision of whether the motion estimation with the residual-prediction is terminated, so a lot of macroblock can avoid the undesirable motion estimation with the residual-prediction. And it makes use of the upsampled motion vectors to do the motion estimation with the residual-prediction if it is unavoidable. Simulation results indicate that the proposed algorithm can decrease the coding time of the motion estimation in the enhancement layer by 35%, and the computational complexity of encoder is significantly reduced.