结合视频内容的AV1快速块划分决策  

Fast Coding Block Partition Decision for AV1 Combining Video Content

作　　者：谢璇 黄婉溦 陈钰 王宝土[1] 陈建[1] XIE Xuan;HUANG Wanwei;CHEN Yu;WANG Baotu;CHEN Jian(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China;School of Foreign Languages,Tianjin University of Technology and Education,Tianjin 300222,China)

机构地区：[1]福州大学物理与信息工程学院,福建福州350108 [2]天津职业技术师范大学外国语学院,天津300222

出　　处：《无线电通信技术》2024年第5期1029-1036,共8页Radio Communications Technology

基　　金：国家自然科学基金(62001117);产学研联合项目(2021031505)。

摘　　要：针对AOMedia Video 1(AV1)编码时间较长的问题,基于不同纹理的视频内容与分区模式之间的联系,引入了虚拟子块的跨块梯度差来衡量图像纹理分布的差异,提出了一种快速块划分决策算法,以跳过非必要的分区模式。利用分区终止块大小与性能损失之间的联系,根据当前块大小自适应调整快速块划分的判断阈值,使得较小的编码块具有较宽松的跳过条件。与libaom相比,该算法在全帧内(All-Intra,AI)配置下平均可节省16.15%的编码时间,同时性能损失较小,有望被用于减少高分辨率视频的编码时间。To solve the problem of long encoding time of AOMedia Video 1(AV1),based on the connection between video content with different textures and partition modes,we propose a method that utilizes the cross-block gradient difference of virtual sub-blocks to measure the difference in image texture distribution.And a fast coding block partition decision to skip unnecessary partition modes is proposed.Besides,the connection between the partition termination block size and the increment of performance loss has been considered.The threshold for fast coding block partition decision can be adjusted adaptively according to the current block size,with smaller blocks having relatively loose judgment conditions.Compared with libaom,the proposed method can achieve an average encoding time saving of 16.15%in All-Intra(AI)configuration,without a significant loss in compression performance.It is expected to be applied to reduce the encoding time of high-resolution video.

关 键 词：AV1 视频编码 分区决策 梯度差异 

分 类 号：TN919.81[电子电信—通信与信息系统]