基于运动估计EPZS算法的优化

Optimization of EPZS algorithm based on motion estimation

编码器中的运动估计、计算量非常巨大,消耗了整个编码时间的80%,严重降低了编码的实时性。为了高效节省运动估计时间和编码时间,在充分研究预测区域搜索算法(EPZS)的基础上,提出一种对H.264视频编码标准采纳的EPZS算法进行了初始中心点和搜索模板的优化方法。在H.264编码器的参考模型JM10.1中,对4个测试序列进行测试。优化试验结果显示,在图像质量不变的情况下,优化后的算法与原算法相比,增强了编码器的实时性,尤其是对运动序列比较复杂的序列效果更加明显。

The real-time of encoder is reduced seriously because of the tremendous computation of the motion estimation,which has to cost 80% time at least in the whole encode period.In order to save the time of motion estimation and encode as far as possible,a method for optimizing the initial center point and search template was presented for the EPZS（enhanced predictive zonal search） algorithm of the H.264 video coding standards.Under the same case of image quality,the four testing sequence compared with the original algorithm was tested in the reference model JM10.1 of the H.264 encoder.The experimental results show that the performance of optimal EPZS algorithm is better and more strong adaptability,especially the effect of the more complex sequences is more obvious by testing the four testing sequence.