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《Journal of Optoelectronics·Laser》 2018-06
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Fast intra prediction for HEVC screen content

HUANG Sheng;CHENG Fang;SI Peng-tao;XIANG Jin-song;Key Laboratory of Optical Communication and Networks,Chongqing University of Posts and Telecommunication;  
Screen content coding(SCC)is the extension of high efficiency video coding(HEVC).However,the intrinsic HEVC recursive partitioning scheme and the additional SCC tools impose significant computational burden on the encoder,primarily during the seeking of optimal combinations of coding units(CU)partitions and CU modes.This paper presents a fast Intra prediction method based on screen content.First,we propose a classification method about CUs.CUs are classified into completely smooth content CUs(PSCU),natural contend CUs(NCCU)and screen content CUs(SCCU)based on the statistic characteristics of the content.For PSCUs,the newly adopted prediction modes include the DC mode,planar mode,horizontal angle mode and vertical angle mode,while the intra block copy(IBC)and palette coding transform(PLT)modes are skipped.In addition,the quadtree partition process is also terminated,as the homogeneous and smooth block usually chooses a large size CU.For NCCUs,the traditional 35 kinds of intra modes are selected as candidates,and the IBC and PLT modes are skipped.For SCCUs,the IBC model is used for prediction and then the spatial correlation is used to determine whether skipping the traditional intra prediction mode.Under all-intra configurations,experimental results show that the algorithm we propose can save 35.96%coding time on average compared with SCM-3.0,only with a negligible bitrate increase.
【Fund】: 国家自然科学基金(61371096 61571072);; 重庆市基础与前沿研究计划(cstc2015jcyjA40015、cstc2013jcyjA40052、CSTC2013jcyjA40012)资助项目
【CateGory Index】: TN919.81
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