学科分类
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3 个结果
  • 简介:Toaimathighercodingefficiencyformultiviewvideocoding,themultiviewvideowithamodifiedhighefficiencyvideocoding(MV-HEVC)codecisproposedtoencodethedependentviews.However,thecomputationalcomplexityofMV-HEVCencoderisalsoincreasedsignificantlysinceMV-HEVCinheritsallcomputationalcomplexityofHEVC.ThispaperpresentsanefficientalgorithmforreducingthehighcomputationalcomplexityofMV-HEVCbyfastdecidingthecodingunitduringtheencodingprocess.Inourproposal,thedepthinformationofthelargestcodingunits(LCUs)fromindependentviewandneighboringLCUsisanalyzedfirst.Afterwards,theanalyzedresultsareusedtoearlydeterminethedepthfordependentviewandthusachievecomputationalcomplexityreduction.Furthermore,apredictionunit(PU)decisionstrategyisalsoproposedtomaintainthevideoquality.Experimentalresultsdemonstratethatouralgorithmcanachieve57%timesavingonaverage,whilemaintaininggoodvideoqualityandbit-rateperformancecomparedwithHTM8.0.

  • 标签: 视频编码 预测单元 决策算法 多视点 计算复杂度 视频质量
  • 简介:Space-TimeBlock(STB)codehasbeenaneffectivetransmitdiversitytechniqueforcombatingfadingduetoitsorthogonaldesign,simpledecodingandhighdiversitygains.Inthispaper,aunit-ratecomplexorthogonalSTBcodeformultipleantennasinTimeDivisionDuplex(TDD)modeisproposed.Meanwhile,TurboCoding(TC)isemployedtoimprovetheperformanceofproposedSTBcodefurtherbyutilizingitsgoodabilitytocombatthebursterroroffadingchannel.Comparedwithfull-diversitymultipleantennasSTBcodes,theproposedcodecanimplementunitrateandpartialdiversity;andithasmuchsmallercomputationalcomplexityunderthesamesystemthroughput.Moreover,theapplicationofTCcaneffectivelymakeupfortheperformancelossduetopartialdiversity.SimulationresultsshowthatontheconditionofsamesystemthroughputandconcatenationofTC,theproposedcodehaslowerBitErrorRate(BER)thanthosefull-diversitycodes.

  • 标签: 时空块码 传输多样性 编码 天线