JPEG2000編碼優(yōu)化.doc

遼寧工程技術(shù)大學(xué)碩士學(xué)位論文I摘要JPEG2000是新一代靜止圖象壓縮標(biāo)準(zhǔn)，它具有現(xiàn)代圖象壓縮所要求的新性能如良好的低比特率壓縮性能、支持圖象質(zhì)量和分辨率漸進(jìn)傳輸、支持感興趣區(qū)域編碼等，可應(yīng)用于數(shù)碼相機(jī)、網(wǎng)絡(luò)傳輸、無線通信、醫(yī)療圖象等領(lǐng)域。本文首先介紹了小波變換理論在圖象壓縮中的應(yīng)用，接著由嵌入式零樹小波編碼算法引到JPEG2000靜態(tài)圖象壓縮標(biāo)準(zhǔn)。通過對(duì)JPEG2000標(biāo)準(zhǔn)及其核心算法EBCOT的分析和研究，針對(duì)EBCOT中位平面編碼比較費(fèi)時(shí)、比較復(fù)雜等問題，依據(jù)圖象的相關(guān)性，提出了根據(jù)前一幀截?cái)帱c(diǎn)來預(yù)測(cè)當(dāng)前幀截?cái)帱c(diǎn)的方法，并通過VC編程對(duì)優(yōu)化后的算法進(jìn)行實(shí)現(xiàn)，實(shí)驗(yàn)分析表明該優(yōu)化方法達(dá)到了提高編解碼速度的目的。關(guān)鍵字：圖象壓縮；JPEG2000；小波變換；EBCOT遼寧工程技術(shù)大學(xué)碩士學(xué)位論文IIAbstractJPEG2000isthenewgenerationofstationarypicturecompressionstanded,ithasthenewperformancelikegoodlowbitratecompressionperformance,thesupportpicturequalityandtheresolutionwhichthemodernimagecompressionrequestsadvancesgraduallythetransmission,thesupportfeelstheInterestregioncodeandsoon,ithasagreatvarietyofapplicationssuchasDigitalCameras,Networktransmission,WirelessCommunication,MedicalImagingandsoon.Thealgorithmhavingintroducedthattheminorwaveshiftscodeoftheoryminorwaveinzerotreesapplying,catchingfromimplantingstyleinimagecompressionfirstcausesthemainbodyofabooktoarriveattheJPEG2000staticstateimagecompressionstandard.AndpasstoJPEG2000standardandtheircorealgorithmEBCOTanalysisandstudy,correlativityspecificallyforplaceflatsurfacecodeproblemsuchasbetime-consumingcomparatively,comparativelycomplicated,judgesbyimageinEBCOT,havesuggestedthatthetruncationforecaststhemethodcuttingoffpointcurrentlyframeaccordingtothefirstonecoming,methodachievesrisearrangeintodecipherspeedspurposebythefactthattheVC+programmingcarryingoutrealizationonthealgorithmoptimizingthequeen,theexperimentanalysisindicatingthatoptimization.Keywords:Imagecompression；JPEG2000；Wavelettransform；EBCOT遼寧工程技術(shù)大學(xué)碩士學(xué)位論文III目錄1緒論11.1引言11.2JPEG2000圖象編碼研究歷史與現(xiàn)狀11.3小波理論在圖象編碼中的作用31.4本文研究的主要內(nèi)容42圖象編碼理論基礎(chǔ)52.1圖象編碼的基本方法52.2小波理論基礎(chǔ)62.2.1小波函數(shù)62.2.2離散小波變換72.3多分辨分析(MRA)82.4Mallat算法92.5嵌入式零樹小波編碼算法（EZW）112.5.1算法步驟112.5.2算法分析142.6JPEG2000標(biāo)準(zhǔn)簡(jiǎn)介152.6.1JPEG2000概述162.6.2JPEG2000特征集183JPEG2000標(biāo)準(zhǔn)253.1JPEG2000編解碼系統(tǒng)253.1.1預(yù)處理273.1.2分量轉(zhuǎn)換273.1.3小波變換283.1.4量化323.1.5熵編碼333.2JPEG2000核心算法EBCOT343.2.1Tier-1編碼35遼寧工程