JPEG2000编码优化.doc

辽宁工程技术大学硕士学位论文I摘要JPEG2000是新一代静止图象压缩标准，它具有现代图象压缩所要求的新性能如良好的低比特率压缩性能、支持图象质量和分辨率渐进传输、支持感兴趣区域编码等，可应用于数码相机、网络传输、无线通信、医疗图象等领域。本文首先介绍了小波变换理论在图象压缩中的应用，接着由嵌入式零树小波编码算法引到JPEG2000静态图象压缩标准。通过对JPEG2000标准及其核心算法EBCOT的分析和研究，针对EBCOT中位平面编码比较费时、比较复杂等问题，依据图象的相关性，提出了根据前一帧截断点来预测当前帧截断点的方法，并通过VC编程对优化后的算法进行实现，实验分析表明该优化方法达到了提高编解码速度的目的。关键字：图象压缩；JPEG2000；小波变换；EBCOT辽宁工程技术大学硕士学位论文IIAbstractJPEG2000isthenewgenerationofstationarypicturecompressionstanded,ithasthenewperformancelikegoodlowbitratecompressionperformance,thesupportpicturequalityandtheresolutionwhichthemodernimagecompressionrequestsadvancesgraduallythetransmission,thesupportfeelstheInterestregioncodeandsoon,ithasagreatvarietyofapplicationssuchasDigitalCameras,Networktransmission,WirelessCommunication,MedicalImagingandsoon.Thealgorithmhavingintroducedthattheminorwaveshiftscodeoftheoryminorwaveinzerotreesapplying,catchingfromimplantingstyleinimagecompressionfirstcausesthemainbodyofabooktoarriveattheJPEG2000staticstateimagecompressionstandard.AndpasstoJPEG2000standardandtheircorealgorithmEBCOTanalysisandstudy,correlativityspecificallyforplaceflatsurfacecodeproblemsuchasbetime-consumingcomparatively,comparativelycomplicated,judgesbyimageinEBCOT,havesuggestedthatthetruncationforecaststhemethodcuttingoffpointcurrentlyframeaccordingtothefirstonecoming,methodachievesrisearrangeintodecipherspeedspurposebythefactthattheVC+programmingcarryingoutrealizationonthealgorithmoptimizingthequeen,theexperimentanalysisindicatingthatoptimization.Keywords:Imagecompression；JPEG2000；Wavelettransform；EBCOT辽宁工程技术大学硕士学位论文III目录1绪论11.1引言11.2JPEG2000图象编码研究历史与现状11.3小波理论在图象编码中的作用31.4本文研究的主要内容42图象编码理论基础52.1图象编码的基本方法52.2小波理论基础62.2.1小波函数62.2.2离散小波变换72.3多分辨分析(MRA)82.4Mallat算法92.5嵌入式零树小波编码算法（EZW）112.5.1算法步骤112.5.2算法分析142.6JPEG2000标准简介152.6.1JPEG2000概述162.6.2JPEG2000特征集183JPEG2000标准253.1JPEG2000编解码系统253.1.1预处理273.1.2分量转换273.1.3小波变换283.1.4量化323.1.5熵编码333.2JPEG2000核心算法EBCOT343.2.1Tier-1编码35辽宁工程