欢迎来到天天文库
浏览记录
ID:53022226
大小:1.19 MB
页数:5页
时间:2020-04-12
《《高效率视频编码中基于块整合的错误隐藏算法》.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofComputerApplicationsISSN10o1—9081201506—10计算机应用,2015,35(6):1744—1748CODENJYIIDUhttp://www.joca.CB文章编号:1001.9081(2015)06—174—05doi:10.11772/j.issn.1001—9081.2015.06.174高效率视频编码中基于块整合的错误隐藏算法高文华,张义云。,王海东(太原科技大学电子信息工程学院,太原030024)(}通信作者电子邮箱ha~syiyunl123@163.corn)摘要:针对新一代视频编码标准高效率视频编码(HE
2、VC)编码单元(CU)尺寸较大所导致的丢包后错误隐藏恢复效果不佳的问题,提出了对CU下的分割块进行块融合的错误隐藏方法。首先,分析了残差能量与块分割的相关性;然后,通过参考帧残差能量与所设阈值进行比较判决,对当前丢失CU分割块进行融合,得到丢失CU的块分割方式;其次,对矢量外推法进行权值优化,保证了算法在HEVC错误隐藏的适用性;最后,对融合块采用优化后的矢量外推法进行错误隐藏。实验结果表明,与经典错误隐藏方法如拷贝法、运动补偿法等相比,基于块融合的错误隐藏在保证解码视频结构相似性(SSIM)的同时提高了不同运动性的解码视频峰值信噪比(PSNR),验证了算法的可行性。关键词
3、:高效率视频编码;编码单元;残差能量;块融合;矢量外推中图分类号:TP391.41文献标志码:AErrorconcealmentforhighefficiencyvideocodingbasedonblock-mergingGAOWenhua,ZHANGYiyun,WANGHaidong(CollegeofElectronicInformationEngineering,TaiyuanUniversityofScienceandTechnology,TaiyuanShanxi030024,China)Abstract:TheCodingUnit(CU)sizeinHighE
4、ficiencyVideoCoding(HEVC)ismoretimesthanthatinpreviouscodingstandards,SOtheerrorconcealmentinHEVChasapoorresultinvideodecodingwhenpacketlossoccurs.Anerrorconcealmentmethodbasedonblock—mergingofsegmentationblockunderCUwasproposed.Firstly,thecorrelationbetweenresidualenergyandblocksegmentati
5、onWasanalyzed.Secondly,thereferenceframeresidualenergywascomparedwithasetthreshold,andthelostCUsegmentationblockwasmergedbasedonthecomparisoninformation.Then,thevectorextrapolationmethodwasoptimizedbyweightstoensuretheapplicabilityoftheproposedalgorithminHEVCerrorconcealment.Finally,theopt
6、imizedvectorextrapolationmethodwasusedforerorconcealmentofmergedblock.Theexperimentalresultsshowthat,comparedwiththeclassicerorconcealmentmethodssuchasthemethodsofcopy,motioncompensation,theproposedmethodguaranteestheStructuralSimilarityIndexMeasurement(SSIM)ofdecodedvideoandimprovesthePea
7、kSignal—To—NoiseRatio(PSNR)ofdecodedvideoindifferentmotility,andthefeasibilityoftheproposedalgorithmisverified.Keywords:HighEficiencyVideoCoding(HEVC);CodingUnit(CU);residualenergy;block—merging;motionvectorextrapolation帧内进行最佳匹配块选择。但针对H.264的错误隐藏方法0引言通常设计目的是为恢复
此文档下载收益归作者所有