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ID:32288452
大小:4.83 MB
页数:81页
时间:2019-02-02
《静止灰度图像分形压缩编码算法的改进的研究优化》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、AbstractFractalimagecompressing(FIC)takesadvantageofself-similaritywhichexistsintheimagescommonly.Itusestheself-similarityindifferentscalesofimagetoremovethegeometryredundancyandachieveaveryhighcompressionratio.However,themaindrawbacksofFICaretheexpensivecomputationalcostintheencodingprocess,theb
2、lock-effectindecodingimage,etc.Thisauthorstudiesmainlyhowtoimproveimagequalityandruntimeintheencodingprocess.Theprojectissupportedbythementorprojectfunds.Themainresearchworkcanbeorganizedinthefollowingaspects:1.Basedonintroducingtheimageencodingandfractaltheory,thispaperanalyzedtheexistingFICalgo
3、rithmsystematically.ThentheemphasiswasprogrammingforthebasicFICalgorithm(Jacquinalgorithm).Ittestedtheencodingtime,imagecompressionratioandthepeakvaluesignal-to-noiseratioaftercompressedtheselectionofdifferentimageandobjectivelyanalyzedtheadvantagesanddisadvantagesofthebasicFICalgorithm.Forresolv
4、ingtheproblemauthormainlysumsupsomecommonstrategy.2.Basedonthesemi-normalgorithm,thispaperpresentedanimprovedalgorithmonimagesegmentationstrategy,themodeofsamplingcontractionforthecodebookandsearchforthenearestfartherblock.Inthisway,itcanreducethesearchingrangeofthematchedblockandimprovethematche
5、daccuracy,andinordertocutwaybackonthecodingtimeandimprovedecodingimagequality.Experimentalresultsshowthatthenewalgorithmcanmaintainthecodingtimewhilereducingboxeffectandprovingthequalityoftheimage.3.Basedonresearchingtheimagewaveletcoefficientscorrelation,afastfractalimagecodingalgorithmispropose
6、d.Itcombinedthegoodpointsfromliftingwavelettransformandfractalencoding.Firstly,thisalgorithmhasathree-leveldecompositiontotheimagetakingadvantagingofliftingwavelet,andthen,processesdifferentsub-bandimagerespectivelybyusingtherelativitycharacteristicsbetweenwaveletcoefficient:inconnectionwiththelo
7、w-frequencyingredientLL3afterdecomposing,adoptsanadvancedfractalencodingmethod;andalsoappliesafractalencodingmethodofstationarycode-poolfor3-leveland2-levelsub-bandexceptLL3;whileit'savailabletohaveaevaluatetoworkitout
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