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視頻壓縮編碼的差錯(cuò)復(fù)原技術(shù)
摘要在無(wú)線(xiàn)移動(dòng)信道和因特網(wǎng)等環(huán)境下的壓縮視頻傳輸業(yè)務(wù),信道傳輸差錯(cuò)不但嚴(yán)重影響業(yè)務(wù)質(zhì)量,甚至?xí)䦟?dǎo)致整個(gè)視頻通訊完全失效,因此差錯(cuò)復(fù)原技術(shù)就成為易發(fā)生差錯(cuò)信道下視頻編碼的重要組成部分.在h.263 ,h.263 和mpeg-4等視頻編碼標(biāo)準(zhǔn)中均采用了若干差錯(cuò)復(fù)原技術(shù)或工具.該文對(duì)目前各種新的視頻編碼標(biāo)準(zhǔn)中所應(yīng)用的一些差錯(cuò)復(fù)原技術(shù),如重同步、數(shù)據(jù)分割、可逆變長(zhǎng)編碼、參考圖象選擇、差錯(cuò)掩蓋等的內(nèi)容、原理進(jìn)行了具體的敘述.并利用第三代移動(dòng)通訊系統(tǒng)的信道模型進(jìn)行了差錯(cuò)復(fù)原技術(shù)的實(shí)驗(yàn).結(jié)果表明,在應(yīng)用了差錯(cuò)復(fù)原技術(shù)后,重建圖象的主客觀質(zhì)量均得到了明顯的改善.關(guān)鍵詞視頻編碼差錯(cuò)復(fù)原數(shù)據(jù)分割可逆變長(zhǎng)編碼差錯(cuò)掩蓋errorresilienceinvideocoding
liangfan,weixiao-hui,xiaozi-mei,liuhong-mei
(schoolofinformationscienceandtechnology,zhongshanuniversity,guangzhou510275)
abstracttheproblemoferrorresilienceincompressedvideocommunicationisbecomingincreasinglyimportantbecauseofthegrowinginterestinvideodeliveryovererror-pronechannelssuchasmobilenetworksandtheinternet.oneinherentproblemofsucherror-pronechannelsischannelerrors.currentvideocompressionstandardsachieveefficientcompressionbyusingpredictivecodingandvariablelengthentropycoding.variablelengthcodingschemesarehighlyvulnerabletochannelerrors.predictivecodingmakemattersmuchworsesincetheerrorsquicklypropagateacrosstheentirevideosequence.sotheeffectoftheseerrorsnotonlycancausegreatdegradationofthequalityofservice,evencanleadtothefailureofthewholevideocommunicationsystem.someerrorresiliencetechnologieshavealreadybeenincludedinseveralvideocodinginternationalstandardssuchash.263 ,h.263 andmpeg-4.thisarticlegivesadetaildescriptionofthecontentandprincipleoferrorresiliencetechnologies,suchasresynchronization,datapartitioning,reversiblevariablelengthcoding,referencepictureselectionmodeanderrorconcealment,etc,whichareusedindiversifiednewvideocodinginternationalstandards.thisarticlealsogivessomesimulationresultsoferrorresiliencetechnologiesbasedonimt-2000channelmodels.theresultshowserrorresiliencetechnologiescanremarkablyimprovethesubjectiveandobjectivequalityofthereconstructedimage.keywordsvideocoding,errorresilience,datapartitioning,reversiblevariablelengthcoding,errorconcealment0
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