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中文摘要：
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．
英文摘要：
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.
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