简介:Amethodforshadowdetectionandcompensationforcoloraerialimagesispresented.Itisconsideredthattheintensityvalueofeachimagepixelistheproductofilluminationfunctionandgroundobjectreflection,andtheshadowedregionsontheimagearemainlycausedbytheshortofillumination,sotheinformationcompensationfortheshadowedregionsshouldconcentrateontheilluminationadjustmentofconcernedareaonthebasisoftheanalysisofwholeimage.Theshadowdetectionandcompensationprocedureproposedbythispaperconsistsoffoursteps.
简介:Jiaxing:SteppingOutFromShanghai'sShadowBystaffreporterLuHUISUZHOUANDHangzhouhavelongbeendescribedbytheChineseasaparadiseforda...
简介:Heightextractionforbuildingsisafundamentalstepof3Dscenereconstructioninmanyvirtualrealityapplications.Inthispaper,weproposeanautomaticmethodtoextracttheheightofbuildingsinhighresolutionsatelliteimagerybasedonthelengthofshadow.Takingintoaccountthelimitationoftraditionalalgorithms,wemakeuseoftheboundaryinformationofabuildingtofacilitatedetectingandmatchingtheshadowregionswithhigheraccuracy.Then,weintroduceashadow-castmodeltocorrecttheshadowlocationinoursystem.Theexperimentalresultshowsthatwhenextractingtheheightofbuildingsfromcomplexurbanregions,ourmethodhasbetteraccuracy.
简介:Amacro-cellwasusedtostudythephenomenonofanodestriationona34VGAShadowMaskPlasmaDisplayPanel(SMPDP).Thebreakdownprocessinthesustainingperiodofthemacro-cellwastakenbyanIntensifiedChargeCoupledDevice(ICCD)withnarrowbandfilters.ThemechanismofformationandevolutionoftheanodestriationonSMPDPwereinvestigated.Theinfluenceofthewidthoftheelectrode,thesustainingvoltage,sustainingfrequencyandthevoltageoftheshadowmaskontheanodestriationwasalsostudied.Theresultsshowedthatthewidthoftheelectrodes,thesustainingvoltageandfrequencyhadastronginfluenceontheanodestriation.Thevoltageoftheshadowmask,however,hardlyaffectedtheanodestriation,thefiringvoltageorthesustainingvoltage.
简介:Videoobjectsegmentationisimportantforvideosurveillance,objecttracking,videoobjectrecognitionandvideoediting.Anadaptivevideosegmentationalgorithmbasedonhiddenconditionalrandomfields(HCRFs)isproposed,whichmodelsspatio-temporalconstraintsofvideosequence.Inordertoimprovethesegmentationquality,theweightsofspatio-temporalcon-straintsareadaptivelyupdatedbyon-linelearningforHCRFs.Shadowsarethefactorsaffectingsegmentationquality.Toseparateforegroundobjectsfromtheshadowstheycast,lineartransformforGaussiandistributionofthebackgroundisadoptedtomodeltheshadow.Theexperimentalresultsdemonstratedthattheerrorratioofouralgorithmisreducedby23%and19%respectively,comparedwiththeGaussianmixturemodel(GMM)andspatio-temporalMarkovrandomfields(MRFs).
简介:Theshadowofacirclecastingonaunparallelplaneisanellipse,theshadowalgorithminvolvesaperspectiveaffinetransformation.Undercommonlyusedlight,thetransformationmatrixforparallelcirclesofdifferentdiameterscastingshadowsontothesameplaneisidentical.UsingAutoCADtogettheshadowofageneralobjectofrevolution,itonlyneedstotakeaseriesofcirclesalongtheaxisofsymmetryandgettheircorrespondingshadowsofellipses,drawinganenvelopetocoverallthesesilhouettesresultsintherequiredoverallshadow.Thenthediscretepointsofshadowcontourlineareprojectedbackontotheoriginalobjectsurface,shadowontheobjectisobtainedaltogether.
简介:中国从严肃的水问题正在经历。在在堤的构造的中国的九主要的河盆之中有许多差别,水库,制约,洪水分泌物工程,洪水转向工程,浇生态的建设,水管理管理,等等。为九条主要的河的水资源的阴影价格能提供建议给中国政府。这篇文章开发价格基于优化模型的amultiperiod输入产量接近的一个动态阴影。不同于以前的途径,新模型基于动态可计算出来的一般平衡(DCGE)解决水资源的边缘的long-termprices的问题的模型。首先,DCGE的定义和算法被详细描述。第二,为在在用国家的水管理input-holding-output的中国的1949-2050的九条主要的河的水资源的阴影价格的结果搁置因为在1999的九条主要的河被列出。这篇文章的Aconclusion是为九条主要的河的水资源的阴影价格大部分基于缺乏的程度。水资源的售价应该经由代表阴影价格的参数的用法被修订。
简介:摘要:本文对linux系统shadow文件SHA512模式下密码的生成方式进行了详细的讨论,同时对密码学安全进行了简要介绍。