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視頻壓縮編碼的差錯復原技術
摘要在無線移動信道和因特網等環(huán)境下的壓縮視頻傳輸業(yè)務,信道傳輸差錯不但嚴重影響業(yè)務質量,甚至會導致整個視頻通訊完全失效,因此差錯復原技術就成為易發(fā)生差錯信道下視頻編碼的重要組成部分.在h.263 ,h.263 和mpeg-4等視頻編碼標準中均采用了若干差錯復原技術或工具.該文對目前各種新的視頻編碼標準中所應用的一些差錯復原技術,如重同步、數據分割、可逆變長編碼、參考圖象選擇、差錯掩蓋等的內容、原理進行了具體的敘述.并利用第三代移動通訊系統(tǒng)的信道模型進行了差錯復原技術的實驗.結果表明,在應用了差錯復原技術后,重建圖象的主客觀質量均得到了明顯的改善.關鍵詞視頻編碼差錯復原數據分割可逆變長編碼差錯掩蓋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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