HEVC帧内编码单元快速划分算法  

Fast intra coding unit partition algorithm for HEVC

作　　者：金智鹏[1] 代绍庆[1] 王利华[2] 

机构地区：[1]嘉兴职业技术学院信息技术分院,浙江嘉兴314036 [2]浙江(嘉兴)微软技术研究中心,浙江嘉兴314000

出　　处：《南京邮电大学学报（自然科学版）》2015年第2期58-63,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：浙江省教育厅科研项目(Y201431212);嘉兴市科技计划(2014AY11003)资助项目

摘　　要：针对HEVC帧内编码中CU(Coding Units)模式判决过程计算复杂度高的问题,分析了CU四叉树划分结构的特征,提出了一种新的帧内编码单元快速判决算法。首先,提取前一帧相同位置CU的最优划分结构,以预测当前CU的起始划分深度和终止划分深度。然后,结合亮度直方图的密集度特征,设置自适应的双阈值对当前CU划分的深度范围进行精确调整,从而跳过或终止部分不适合此纹理特征的划分模式。测试结果显示,该算法在BD-Rate损失仅为0.374%的情况下,提高了51.654%的编码速度,具有良好的实际应用价值。Aiming at the high complexity of coding unit（CU） mode decision in HEVC, the characteristics of CU quadtree partition structure are analyzed and a new fast intra coding mode decision algorithm is presented. Firstly, in order to predict the start depth and stop depth of current CU, the best partition structure from the co-located position of the previous frame is extracted. Then, combined with the density of histogram , adaptive double threshold is set for precise adjustment of the depth range, thus skipping or terminating some CU sizes that are not suitable for the texture features. Experimental results show that the proposed algorithm can reduce about 51. 654% eneoding time, while BD-Rate loss is only O. 374%, thus it ha.~ a high value of nractical annlication.

关 键 词：HEVC/H.265 帧内预测 模式判决 编码单元 

分 类 号：TN919.81[电子电信—通信与信息系统]