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采用的低码率视频编码方法是以全局运动补偿和局部运动补偿为核心的混合编码方法.主要针对MPEG-4中原有算法计算量大、复杂度高的特点进行了编码系统优化,将这一编码方法实用化.该优化方法是针对占编码系统70%计算量的全局运动估计进行的,采用了基于运动特征的运动估计方法和鲁棒的目标函数,并在优化方法中引入了三级金字塔的分层计算.从对比实验结果来看,优化方法对不同运动类别视频的编码都是有效的,系统编码速度提高了3倍以上.目前,这项优化方法已经被MPEG-4视频编码优化小组采用.
The low bit rate video coding method is based on the global motion compensation and local motion compensation as the core of the hybrid coding method.Mainly for MPEG-4 in the original algorithm has a large amount of calculation, high complexity of the coding system optimization, this The optimization method is based on the global motion estimation which accounts for 70% of the computation amount of the coding system. The motion estimation method based on the motion characteristics and the robust objective function are adopted. In the optimization method, the third-level pyramid From the comparative experimental results, the optimization method for different categories of video coding is effective, the system encoding speed increased by more than three times.Today, this optimization method has been MPEG-4 Video Coding Optimization Group use.