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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境下的壓縮視頻傳輸業務,信道傳輸差錯不但嚴重影響業務質量,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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