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1、Two-stageimagesegmentationbasedonedgeandregioninformationJournalofHarbinInstituteofTechnolo(NewSeries),Vo1.14,No.4,2007Two-stageimagesegmentationbasedonedgeandregioninformationRANXin.QIFei—hu冉鑫,戚飞虎(1.MerchantMarineCollege,ShanghaiMaritimeUniversity,Shanghai20
2、0135,China,E—mail:simonran@sjtu.edu.cn2.Dept.ofComputerScienceandEngineering,ShanghaiJiaotongUniversity,Shahghai200030,China)Abstract:Atwo—stagemethodforimagesegmentationbasedonedgeandregioninformationisproposed.Differ-entdeformationschemesareusedattwostagesf
3、orsegmentingtheobjeetcorrectlyinimageplane.Atthefirststage,thecontourofthemodelisdividedintoseveralsegmentshierarchicallythatdeformrespectivelyusingaf-finetransformation.Afterthecontourisdeformedtotheapproximateboundaryofobject,afinematchmecha—nismusingstatis
4、ticalinformationoflocalregiontoredefinetheexternalenergyofthemodelisusedtomakethecontourfittheobject~boundaryexactly.Thealgorithmiseffective,asthehierarchicalsegmentaldeformationmakesuseoftheglobeandlocalinformationoftheimage,theaffinetransformationkeepstheco
5、nsistencyofthemodel,andthereformativeapproachesofcomputingtheinternalenergyandexternalenergyareproposedtore—ducethealgorithmcomplexity.Theadaptivemethodofdefiningthesearchareaatthesecondstagemakesthemodelconvergequickly.Theexperimentalresultsindicatethatthepr
6、oposedmodeliseffectiveandrobusttolo—calminimaandabletosearchforconcaveobjects.Keywords:activecontourmodel;regiongrowing;imagesegmentation;affinetransformationCLCnumber:TP391Documentcode:AArticleID:1005—9113(2007)04-0533-08Activecontourmodels,alsoknownassnakes
7、…,areenergy—mi'ni'mi'zi'ngsplinesthatcandeformtofitim—agefeaturesundertheinternalforcescomingfromwith.inthecontouritselfandexternalforcescomputedfromtheimagedata.Asactivecontourmodelsutilizetheglobalconstraintsandkeepsmoothandcontinuousdur—ingdeformation,they
8、canextracttheobject~boundarycorrectlyevenwhenlocalboundaryisweakordiscon—nected.Now,activecontourmodelshavebeenusedextensivelyinimageanalysis,videosegmentationandtracking['.andbiomedicala
