采用联合特征的H.266/VVC屏幕内容快速模式选择算法  

Fast Mode Selection Algorithm for H.266/VVC Screen Content Using Joint Features

作　　者：岳洋洋 曾焕强[1,2] 陈婧 林晓丹[1] 蔡灿辉[2] YUE Yangyang;ZENG Huanqiang;CHEN Jing;LIN Xiaodan;CAI Canhui(School of Information Science and Engineering,Huaqiao University,Xiamen,Fujian 361021,China;School of Engineering,Huaqiao University,Quanzhou,Fujian 362021,China)

机构地区：[1]华侨大学信息科学与工程学院,福建厦门361021 [2]华侨大学工学院,福建泉州362021

出　　处：《信号处理》2021年第8期1479-1486,共8页Journal of Signal Processing

基　　金：国家自然科学基金(61871434,61802136);福建省自然科学基金杰出青年项目(2019J06017);厦门市科技重大项目(3502ZCQ20191005);厦门市科技局产学研协同创新项目(3502Z20203033);福建省教改项目(FBJG20180038)。

摘　　要：新一代视频编码标准H.266/VVC针对屏幕内容编码引入帧内块复制、调色板等预测模式,在提高编码效率的同时也带来了巨大的计算复杂度。本文采用角点、水平/垂直活动度和平均颜色亮度差联合特征对屏幕内容视频帧和当前编码单元(Coding Unit,CU)进行分类,将视频帧分为低对比度屏幕视频帧和高对比度屏幕视频帧,将CU细分为自然内容背景CU、屏幕内容背景CU和屏幕内容前景CU,进而对CU模式进行选择性跳过,减少模式选择代价。实验结果显示,在全帧内的条件下,该算法与开启IBC和PLT的H.266/VVC VTM-7.3标准相比,在码率仅增加1.21%的情况下节省了26.41%的编码时间,降低了编码复杂度。For screen content video coding,new prediction modes,such as Intra Block Copy(IBC)and Palette mode(PLT)are introduced into the new generation video coding standard H.266/VVC.Though improves the coding efficiency,the computational complexity increases a lot.To reduce the cost of intra mode prediction,features of corner,horizontal/vertical activity and mean luminance gap are jointly considered to classify the screen content video frame into low-contrast and high-contrast screen videos;and current coding unit(CU)are divided into natural content background CU,screen content background CU,screen content foreground CU.For each sort of CU,some intra prediction modes are selectively skipped to reduce the best mode decision cost.Experimental results show that compared with H.266/VVC VTM-7.3 standard with IBC and PLT enabled,the proposed algorithm saves 26.41%of coding time with only 1.21%bitrate increasement under the configuration of all-intra(AI),which reduces the coding complexity effectively.

关 键 词：H.266/VVC 屏幕内容编码 快速模式选择 

分 类 号：TN919.81[电子电信—通信与信息系统]