摘要
高效视频编码(HEVC)采用编码单元(CU)四叉树的分割结构,相比H.264/AVC显著地提升了编码效率,但却使编码复杂度急剧增加。为此,本文提出一种帧内快速编码算法。首先,根据视频图像纹理复杂度,提前判断是否进行最大编码单元(LCU)分割。然后,根据空域相邻CU的深度预测当前CU的深度范围,跳过不必要的计算;最后,根据预测模式被选为最优预测模式的统计特性,去掉可能性小的帧内预测模式。本文算法在HM14.0的基础上实现。仿真结果表明,本文算法在全I帧模式下与HM14.0相比,帧内编码时间平均减少38%,码率(BR)只增加1.41%,峰值信噪比(PSNR)只降低0.29dB,在保证编码性能和视频质量几乎不变的情况下,本文算法降低了编码的计算复杂度。
High efficiency video coding （HEVC） adopts the coding unit with a quad-tree partitioning structure that can improve the coding efficiency significantly,but this causes a dramatic increase in com- putational complexity compared with H. 264/AVC. Therefore, this paper proposes a fast algorithm for intra coding. Firstly,the texture complexity of a largest coding unit （LCU） is used in advance to deter- mine whether it should be split or not. Then,the depth range of the current coding unit is predicted based on depths of the spatially nearby CUs and helps to skip the unnecessary calculation. Finally, based on statistical characteristics that the intra prediction modes are selected to be the optimal prediction modes, the intra prediction modes with small possibility are excluded. The experimental results show that the proposed algorithm can reduce encoding time by 38% on average compared with HM14.0, with negli- gible loss of coding efficiency,and it cuts down the computational complexity of coding.
作者
黄胜
付雄
郝言明
向劲松
杨晓非
HUANG Sheng FU Xiong HAO Yan-ming XIANG Jin-song YANG Xiao-fei(Key Laboratory of Optical Communication and Networks, Chongqing University of Posts and Telecommunica- tions ,Chongqing 400065, Chin)
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2017年第3期296-303,共8页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61371096
61171158
61571072)
重庆市基础与前沿研究计划(cstc2015jcyjA40015)资助项目
