DOI:10.16136/j.joel.2023.02.0218一种基于子块纹理差异的VVC快速CU划分算法李亚1,2,李强1,2*,孟慧1,2(1.重庆邮电大学通信与信息工程学院,重庆400065;2.信号与信息处理重庆市重点实验室,重庆400065)摘要:针对多功能视频编码(versatilevideocoding,VVC)由于在四叉树(quadtree,QT)划分的基础上引入多叉树(multi-typetree,MTT)划分结构导致编码复杂度过高的问题,本文提出了一种基于编码单元(codingunit,CU)子块纹理特征差异的VVC快速CU划分算法。该算法能够有效降低VVC的编码复杂度,缩短编码时间。首先通过不同划分方向的子块的纹理复杂度差异提前判断MTT划分的方向,跳过不必要的MTT划分方向;然后根据当前CU的相邻子块间的纹理差异判断是否跳过三叉树(ternarytree,TT)划分,以进一步减少候选列表中划分模式的数量。实验结果表明,在全帧内(allintra,AI)的编码配置下,与官方测试平台VTM-7.0相比,本文算法平均能够节省47.24%的编码时间,BDBR(Bjϕntegaarddeltabitrate)仅增加1.26%。关键词:多功能视频编码;编码单元划分;纹理特征;快速算法中图分类号:TN919.8文献标识码:A文章编号:1005-0086(2023)02-0200-08AfastCUpartitionalgorithmforVVCbasedonsub-blocktexturedifferenceLIYa1,2,LIQiang1,2*,MENGHui1,2(1.SchoolofCommunicationandInformationEngineering,ChongqingUniversityofPostsandTelecommunica-tions,Chongqing400065,China;2.ChongqingKeyLaboratoryofSignalandInformationProcessing,Chongqing400065,China)Abstract:Aimingattheproblemofhighcodingcomplexityduetotheintroductionofmulti-typetree(MTT)partitionstructurebasedonquadtree(QT)partitioninversatilevideocoding(VVC),afastcodingunit(CU)partitionalgorithmbasedonthedifferenceoftexturefeaturesofCUsub-blocksispro-posedinthispaper.ThisalgorithmcaneffectivelyreducethecodingcomplexityofVVCandshortenthecodingtime.Firstly,throughthetextcomplexitydifferenceofsub-blocksindifferentpartitiondirections,thedirectionofMTTpartitionisjudgedinadvance,andunnecessaryMTTpartitiondirectionsareskipped;Then,accordingtothetexturedifferencebetweenadjacentsub-blocksofcurrentCU,itisfur-therdeterminedwhethertoskiptheternarytree(TT)partition,soastofurtherreducethenumberofpartitionmodesinthecandidatelist.Theexperimentalresultsshowthatunderthecodin...
