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ID:37372160
大小:2.72 MB
页数:84页
时间:2019-05-22
《快速分形图像编码算法的研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北京交通大学硕士学位论文快速分形图像编码算法的研究姓名:刘美琴申请学位级别:硕士专业:信号与信息处理指导教师:赵耀20061201ABSTRACTFIChasattractedtheattentionofmanynativeorabroadresearcherssinceItwasintroducedintothefieldofimagecoding,duetoitsadvantages,suchashilghcompressionperformance,simpleandfastdecodin
2、gprocess,novelencodinganddecodingtheoryandresolutionindependence.Themainconsumingtimeistheprocessoffindingthebestmatcheddomainblockinalargedomainpoolfuragivenrangeblock,computingandquantizingtheparametersandtheprocessofimagepartition.Thisdissertation
3、beginswiththedevelopment,advantagesanddisadvantagesoffractalimagecoding,andthenintroducessomeimprovedFICalgorithms.Themaincontributionsoftllisdissertationareasfuliows:①Accordingtotherelationshipbetweenthevariancesofrangeblocksanddomainblocks,aalgorit
4、hmisproposedtoimproveFisher’sscheme.ExperimentresultsshowthattheproposedalgorithmneedslessencodingtimeandhavealmostthesamedecodedimagequalityasFisher’s.②AfastfractalimagecodingalgorithmbasedonFGSEisproposedinthisdissertation.It锄speeduptheencodingproc
5、essandkc印thesamedecodedimagequality.Nowadays,mostimprovedfractalimagecodingalgorithmsareinthecostofthedecreaseofthedecodedimage.AfastoptimalblockmatchinginmotionestimationnamedFGSEisfeaturedbyprovidingasequenceoffinegrainedboundarylevelsinanaimtoreje
6、ctacheckingcandidateasearlyaspossible.ALemmawasintroducedtodescribetherelationshipbetweenFICandFGSE.AndthenFGSEcanbeusedinthesearchprocessforthematchedblocksinFIC.③Amultipledescriptionscodingalgorithmbasedonfractalimagecodingisproposedinsectionfive。M
7、ultipledescriptionscoding(MDC)hasemergedasanattractiveframeworkforrobusttransmissionoverunreliablechannels.Inthisthesis,FICisintroducedintoMDCaftertransformingtheparameters.Meanwhile,thefastfractalimagecodingalgorithmbasedonFGSEintroducedaboveisalsou
8、sedinthealgorithmtospeeduptheimagecodingfurther.KEYWORDS:FIC,Variance,FGSE,Lemma,MDC,MDLVQ,MDSQCLASSNo:致谢本论文的工作是在我尊敬的导师赵耀教授的悉心指导下完成的,从开始选题到最后的论文完成,无不倾注着导师的大量心血。当科研工作陷入困境时,赵耀教授总是给予我启迪和帮助,当论文工作进展顺利时,赵耀教授总是鼓励我再接再厉。同时赵教授严谨的治学态度、科学的工作方法、渊博的知识、敏锐的洞察力给我留下了深
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