简介:Non-destructivetesting(NDT)hasbeenwidelyusedinmanyfields,wecaneasilyseeitisbeingusedinshipbuilding,aerospace,weaponsmanufacturingandsoon.ICTisoneofthebestnondestructivetestingmethodscurrently,butithasnotbeenusedwidely,becauseitrequiresmuchcomputeandcostsmuchtime.Defectlocationisoneofthemostimportantprocessingstepsinthedigitalimageanalysis.Defectlocationwouldcorrespondinglyreducethetimespentinthetesting.Wemayonlyrequirelocatingthedefectsinsomecase.So,wedividetheCTimagesintoseverallittleblockswhichthesquareisequal,andthencalculatethefractaloneachblock.Bydeterminingthevalueandconnectedregionnumberofthefractaldimension,wecanlocatedefectsoftheimage.Theresultsshowthattheblockfractaldimensionisausefulandtime-savingdefectlocationmethod.
简介:Natural,efficient,intelligent,andbarrier-freeHCI(Human-ComputerInterface)willbethemaindevelopingdirectionofthenewintelligentHCI.Buildinganintelligent,natural,harmoniousandhumanisticHCIhasbeentheprimarydevelopingtendencyofthenewHCI.'Selectonefrommany'isoneofthekeyquestionsinresearchinganddesigningHCIbasedongestures.Onthesinglechannelinteractiveconditionwhichisbasedon3Dgestureoperation,webuildainteractivemodelof'Selectonefrommany'.Combiningthismodelwith'Token'technologyandreciprocatingmovementfeature,wepresentandrealizeasimpleefficient'Selectonefrommany'algorithm,whichisusedinaconcreteSOR(Selection-Operation-Release)system.IntheSORsystem,werealizeareal-timeselection,trackingandinteractionofnaturalgestures.
简介:AnewmethodtotheproblemoffairingplanarcubicB-splinecurvesisintroducedinthispaper.Themethodisbasedonweightedprogressiveiterativeapproximation(WPIAforshort)andconsistsoffollowingsteps:findingthebadpointwhichneedstofair,deletingthebadpoint,re-insertinganewdatapointtokeepthestructureofthecurveandapplyingWPIAmethodwiththenewsetofthedatapointstoobtainthefairedcurve.Thenewsetofthedatapointsisformedbytherestoftheoriginaldatapointsandthenewinsertedpoint.Themethodcanbeusedforshapedesignanddataprocessing.Numericalexamplesareprovidedtodemonstratetheeffectivenessofthemethod.
简介:人物形象的动态表现中。对头发动态表现的要求是最为详细的,同时也最花费心思。发型不仅仅是一个人的外貌特征,同时也是人的内在表现。但是,到目前为止,对于这样一个相当重要的人体组成部分,表现方式往往是光头、戴帽子或者戴钢盔。好像在逃避观众的注意。这完全是因为在制作头发的动态效果时,受到了表现技术的限制。其实,以戴帽子等方式来回避制作头发的动态效果,并不可取,这种做法往往会引起观众的好奇,更加注意观察头发。在技术日益发展的今天,我们再也没有逃避的理由了,因为我们完全可以表现出高水平的头发动态效果。下面,我们就利用Maya最新推出的“ShaveandaHaircutforMaya”插件程序制作头发的动态效果。