简介:Non-destructivetesting(NDT)hasbeenwidelyusedinmanyfields,wecaneasilyseeitisbeingusedinshipbuilding,aerospace,weaponsmanufacturingandsoon.ICTisoneofthebestnondestructivetestingmethodscurrently,butithasnotbeenusedwidely,becauseitrequiresmuchcomputeandcostsmuchtime.Defectlocationisoneofthemostimportantprocessingstepsinthedigitalimageanalysis.Defectlocationwouldcorrespondinglyreducethetimespentinthetesting.Wemayonlyrequirelocatingthedefectsinsomecase.So,wedividetheCTimagesintoseverallittleblockswhichthesquareisequal,andthencalculatethefractaloneachblock.Bydeterminingthevalueandconnectedregionnumberofthefractaldimension,wecanlocatedefectsoftheimage.Theresultsshowthattheblockfractaldimensionisausefulandtime-savingdefectlocationmethod.
简介:Inmanyvideostandardsbasedoninter-framecompressionsuchasH.26xandMPEG,block-matchingalgorithmhasbeenwidelyadoptedasthemethodformotionestimationbecauseofitssimplicityandeffectiveness.Nevertheless,sincemotionestimationisverycomplexincomputing.Fastalgorithmformotionestimationhasalwaysbeenanimportantandattractivetopicinvideocompression.Fromtheviewpointofmakingmotionvectorfieldsmoother,thispaperproposesanewalgorithmSMVFAST.Onthebasisofmotioncorrelation,itpredictsthestartingpointbyneighboringmotionvectorsaccordingtotheirSADs.Adaptivesearchmodesareusedinitssearchprocessthroughsimplyclassifyingmotionactivity.AfterdiscoveringtheubiquitousratiobetweentheSADsofthecollocatedblocksintheconsecutiveframes,thepaperproposesaneffectivehalf-stopcriterionthatcanquicklystopthesearchprocesswithgoodenoughresults.ExperimentsshowthatSMVFASTobtainsalmostthesameresultsasthefullsearchatverylowcomputationcost,andoutperformsMVFASTandPMVFASTinspeedandquality,whichareadoptedbyMPEG-4.