简介:前言自autodesk收购alisa之后,Maya软件的命运就蒙上了一层神秘的面纱,一时间预测,谣言不绝于耳,甚至有人认为autodesk会结束Maya而专注发展3dmax。重重疑云直至2006年7月31日方才散尽,因为在这一天,autodesk公司正式发布了Maya软件的最新版——Maya8.0。
简介:Weshowhowquantumentangledbiphotonstatescanbeusedtorealizeghostscattering,anonlocalschemetoobtainscatteringinformationofanunknownobjectthroughthecorrelationmeasurementofthescatteringphotonsintwodifferentopticalpaths.WepresentaframeworktodescribethebiphotonghostscatteringprocessfromtheT-matrixformulaofthescatteringtheory.Wefindthescatteringinformationofatestobjectcanberetrievedfromeitherthetestarmorthereferencearm.Byadjustingthebiphotonstates,theghostscatteringpatternsmaybevariedfromthescatteringpatternoftheobjectinthetestarmtotheobjectinthereferencearm.
简介:Ghostimagingcouldbeusedtomakeaquickidentificationoforthogonalobjectsbymeansofphotocurrentcorrelationmeasurements.Inthispaper,weextendthemethodtoidentifynonorthogonalobjects.Inthemethod,anobjectisilluminatedbyonephotonfromanentangledpair,andtheotheroneisdiffractedintoaparticulardirectionbyapre-establishedmultiple-exposurehologramintheidlerarm.Bythecorrelationmeasurements,thenonorthogonalobjectinthesignalarmcouldbediscriminatedwithinaveryshorttime.Theconstraintsfortheidentificationofnonorthogonalobjectsarepresented,whichshowthatthenonorthogonalobjectscanbediscriminatedwhentheoverlappingportionbetweenanytwoobjectsislessthanhalfofalltheobjectsintheset.Thenumericalsimulationsfurtherverifytheresult.
简介:Thefeaturesofthecharacteristicmatrixusedinlinearintensitycorrelationreconstructionmethodsaredirectlyrelatedtothequalityofghostimaging.Inordertosuppressthenoisecausedbytheoff-diagonalelementsinthecharacteristicmatrix,weproposeareconstructionmethodforghostimagingcalledscalar-matrix-structuredghostimaging(SMGI).Thecharacteristicmatrixismadetoapproximateascalarmatrixbymodifyingthemeasurementmatrix.ExperimentalresultsshowthatSMGIimprovesthepeaksignal-to-noiseratiooftheobjectreconstructionsignificantlycomparedwithdifferentialghostimaging,eveninthecaseofanonzerotwo-armlongitudinaldifference,whichisapromisingresultforpracticalapplications.
简介:Thevibrationisoneoftheimportantfactorsaffectingimagingqualityofconventionalremotesensingimagingbecausetherelativemotionbetweentheimagingsystemandthetargetcanresultinthedegradationofimagingquality.Theinfluenceofthevibrationofthedetectorinthetestpathonreflectiveghostimaging(RGI)isinvestigatedtheoreticallyandexperimentally.Weanalyzetheeffectsofthevibratingamplitudeandvelocity.Theresultsdemonstratethatthemicrovibrationsofthebucketdetectorhavealmostnoimpactontheimagingresolutionandsignal-to-noiseratio(SNR)ofRGI,i.e.,thedegradationofimagingqualitycausedbythevibrationofthedetectorcanbeovercometosomeextent.Ourresultscanbehelpfulforremotesensingimaging.
简介:WeassumegeneralizedghostPilgrimdarkenergy(GGPDE)modelinthepresenceofcolddarkmatterinflatFRWuniverse.WithsuitablechoiceofinteractiontermbetweenGGPDEandcolddarkmatter,weinvestigatethenatureofequationofstateparameterforGGPDE.Also,weinvestigatethenaturesofdynamicalscalarfieldmodels(suchasquintessence,tachyon,k-essence,anddilatondarkenergy)andconcernedpotentialsthroughthecorrespondencephenomenonbetweenGGPDEandthesemodels.
简介:Wepresentapseudo-inverseghostimaging(PGI)techniquewhichcandramaticallyenhancethespatialtransverseresolutionofpseudo-thermalghostimaging(GI).IncomparisonwithconventionalGI,PGIcanbreakthelimitationontheimagingresolutionimposedbythespeckle’stransversesizeontheobjectplaneandalsoenablesthereconstructionofanN-pixelimagefrommuchlessthanNmeasurements.Thisfeaturealsoallowshigh-resolutionimagingofgray-scaleobjects.Experimentalandnumericaldataassessingtheperformanceofthetechniquearepresented.