SAR圖像無監(jiān)督變化檢測算法研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文SAR圖像無監(jiān)督變化檢測算法研究姓名：常寶申請學(xué)位級別：碩士專業(yè)：信號與信息處理指導(dǎo)教師：張弓201012SAR圖像無監(jiān)督變化檢測算法研究IIABSTRACTSARimagedetectionasapartofremotesensingtechnologiesisplayingamemeimptantroleincivilmilitaryaffairs.Imagechangedetectionmainlyme

2、ansthatjudgingthetrueearthssurfacechangesnotbetweenmultitempalimages.Thebasicpreconditionofthistechnologyisthatthechangesarousedbyromfactsthechangesarousedbyobjectaredisjunctive.Accdingtotheacteristicofdataprocessingvari

3、oustypesofchangedetectionmethodscanbeclassifiedintosupervisedunsupervised.Thefirstoneneedpriinfmationtogetthetrainingsetbutthesecondonecomparesthemultitempalimagesdirectlywithoutanyextrainfmation.Thoughthesupervisedmetho

4、dsmayhavebetterdetectionperfmanceappropriatepreinfmationcannotalwaysbegot.ThisthesisstudiedunsupervisedSARimagechangedetectionputfwardsomenewideasnewalgithmsobtainedacertainachievement.Mainwksofthispaperareasfollows:1.An

5、alyzethebackgroundresearchsituationofSARimagechangedetectionsystematicallyintroducethebasictheymainmethods.Clarifythescopeideasofthistopic.2.ProposeaDCTbasedunsupervisedSARimagechangedetectionalgithm.CarryonDCTtransfmtot

6、helogratioimagefromtwomultitempalimagesreshapetheDCTcoefficientmatrixbyZigzagtransfmwhichhashigherbrightnessrelativesensitivityhigherlowfrequencyvisualacuityofhumanbiologicalvisualacteristicsthencompresstheDCTmatrixconst

7、ructafeaturevectspacebycompresssamplingmatrixaccdingtoDCTtransfmacteristicsofenergycompressiondecrelation.FinallyobtainthechangemapbyFCMclusteringaccdingtotheproposedmembershipdivisioncriterion.Experimentalresultsshowgre

8、atnoiserobustnessgooddetectionperfmance.3.TraditionalstatisticallybasedSARimagechangedetectionisusuallylimitedbyimagingconditions.Weproposeanunsupervisedchangedetectionalgithmbasedontheimageinherentgeometricalstructures.

9、Firstlyanapproximatecompletedatasetisconstructedtodescribetheimagelocalfeaturesviafuzzyderivativesthenafeaturevectspaceismadetorepresenttheimageinherentstructuresusingimagelocalneighbhoodinfmationspatialcrelation.Finally