外文翻译--从实验设计到曲面重建的探测团浮雕.DOC外文翻译--从实验设计到曲面重建的探测团浮雕.DOC

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西安文理学院本科毕业设计(论文)第1页附录原文PROBINGPICTORIALRELIEFFROMEXPERIMENTALDESIGNTOSURFACERECONSTRUCTIONABSTRACTTHEPERCEPTIONOFPICTONALSURFACESHASBEENSTUDIEDQUANTITATIVELYFORMORETHAN20YEARSDUTINGTHISTIME,THE“GAUGEFIGUREMETHOD”HASBEENSHOWNTOBEAFASTANDINTUITIVEMETHODTOQUANTIFYPICTORIALRELIEFINTHISMETHOD,OBSERVERSHAVETOADJUSTTHEATTITUDEOFAGAUGEFIGURESUCHTHATITAPPEARSTOLIEFLATONASURFACEINPICTORIALSPACEALTHOUGHTHEMETHODHASRECEIVEDSUBSTANTIALATTENTIONINTHELITERATUREANDHASBECOMEINCREASINGLYPOPULAR,ACLEAR,STEPBYSTEPDESCRIPTIONHASNOTBEENPUBLISHEDYETINTHISARTICLE,ADETAILEDDESCRIPTIONOFTHEMETHODISPROVIDEDSTIMULUSANDSAMPLEPREPARATION,PERFORMINGTHEEXPERIMENT,ANDRECONSTRUCTINGA3DSURFACEFROMTHEEXPERIMENTALDATAFURTHERMORE,SOFTWAREWRITTENINPSYCHTOOLBOXBASEDONTHISDESCRIPTIONISPROVIDEDINANONLINESUPPLEMENTTHISREPORTSERVESTHREEPURPOSESFIRST,ITFACILITATESEXPERIMENTERSWHOWANTTOUSETHEGAUGEFIGURETASKBUTHAVEBEENUNABLETODESIGNIT,DUETOTHELACKOFINFORMATIONINTHELITERATURESECOND,THEDETAILEDDESCRIPTIONCANFACILITATETHEDESIGNOFSOFTWAREFORVARIOUSOTHERPLATFORMS,POSSIBLYWEBBASEDTHIRD,THEMETHODDESCRIBEDINTHISARTICLEISEXTENDEDTOOBJECTSWITHHOLESANDINNERCONTOURSTHISCLASSOFOBJECTSHAVENOTYETBEENINVESTIGATEDWITHTHEGAUGEFIGURETASKKEYWORDSDEPTHPERCEPTIONPICTORIALSPACE3DSHAPEINTRODUCTIONALMOST20YEARSAGO,KOENDERINK,VANDOORN,ANDKAPPERS1992PUBLISHEDAKEYSTUDYONQUANTIFYINGTHEPERCEIVED3DSTRUCTUREOFAPICTORIALSURFACETHEIREXPERIENTALTASKWASTOADJUSTTHEATTITUDEOFAGAUGEFIGUREPROBETHEGAUGEFIGURECONSISTSOFACIRCLEWITHARODTHATSTICKSOUTPERPENDICULARLYFROMTHEMIDDLEOBSERVERSAREINSTRUCTEDTOMANIPULATETHE3DORIENTATIONOFTHISPROBESUCHTHATTHEDISKAPPEARSTOLIEFLATONTHEPICTORIALSURFACE,WHILETHERODCONSEQUENTLYSTICKSOUTINTHENORMALDIRECTIONSINCETHEN,NUMEROUSRESEARCHERSHAVEUSEDTHISPARADIGMTOSTUDYVISUALPERCEPTIONOR3DSHAPEYETTHECOMMUNITYOFSCIENTISTSUSINGTHISMETHODHASBEENLIMITEDTOTHOSEWHOUNDERSTANDTHEUNDERLYINGMATHEMATICSANDAREABLETOEXPERIMENTALLYIMPLEMENTTHISMETHODDETAILEDDOCUMENTATIONHASNEVERBEENPUBLISHED西安文理学院本科毕业设计(论文)第2页INACOMPLETEFASHIONTHISARTICLEWILLEXPLAININDETAILALLSTEPSOFTHEPROCEDUREFURTHERMORE,SOFTWAREWRITTENFORPSYCHTOOLBOXBRAINARD,1997;PELLI,1997ISMADEAVAILABLETHATCOVERSALLOFTHESESTEPSANDSHOULDLEADTOANEASILYUSABLEPROCEDURE,BYMEANSOFWHICHANYUSEROFPSYCHTOOLBOXCANCONDUCTGAUGEFIGUREEXPERIMENTSTHEPROCEDUREFORRUNNINGANEXPERIMENTISVISUALIZEDINFIG1EACHOFTHESTEPSCANBEDESCRIBEDASFOLLOWSCONTOURSELECTIONAFTERSELECTINGASTIMULUSIMAGE,THEEXPERIMENTERNEEDSTOSELECTWHICHPARTOFTHEPICTORIALSURFACEISTOBEUSEDFORTHEEXPERIMENTTRIANGULATIONWITHINTHECONTOUR,MEASUREMENTSAMPLESNEEDTOBEDEFINEDTHISISDONEUSINGATRIANGULATIONGRIDEXPERIMENTAFTERITISSETUP,THEEXPERIMENTCANBECONDUCTEDTHEGAUGEFIGUREPROBESHOULDBERENDEREDINTHEPICTURE,ANDTHEOBSERVERSHOULDBEABLETOMANIPULATEITSATTITUDEFIG1ILLUSTRATIONOFTHEFOURPROCEDURALSTEPS3DRECONSTRUCTIONONTHEBASISOFTHEOBSERVERS’SETTINGS,THE3DSURFACECANBERECONSTRUCTEDTHESEDATAARETHEFINALRESULT;FURTHERANALYSISWILLDEPENDONTHESPECIFICRESEARCHQUESTION,ANDSHOULDTHUSBEDESIGNEDBYTHEEXPERIMENTERTHESEFOURSTEPSWILLNOWBEEXPLAINEDINDETAILCONTOURSELECTIONFIRST,ANIMAGEISNEEDEDSOMESHAPESHOULDBEVISIBLE,PREFERABLYASMOOTHONEINPREVIOUSRESEARCH,ONLYANOUTERCONTOURWASDEFINEDTHEMETHODPRESENTEDHEREALSOALLOWSFORDEFININGAHOLEANDINNERCONTOURSTHESETHREETYPESOFCONTOURSAREVISUALIZEDINFIG2THEEXPERIMENTERCANDEFINETHECONTOURMANUALLYBYSELECTINGCONTOURSAMPLEPOINTSTHATFORMAPOLYGONTHATAPPROXIMATESTHEACTUALCONTOURTHEDISTANCEBETWEENTHECONTOURSAMPLEPOINTSCANHAVEAPPROXIMATELYTHESAMESIZEASTHETRIANGULATIONFACESASAMPLINGOFCONTOURPOINTS,ASSHOWNBYTHEREDDOTSINFIG3,ISTHUSSUFFICIENTLYDETAILEDTHEOUTPUTOFTHECONTOURPROCEDURECONSISTSOFTHREESETSOFCOORDINATES,FORTHEOUTER,INNER,ANDHOLECONTOURS,WHICHCANBEWRITTENINNBY2ARRAYSAPOINTONTHECONTOURCANBEWRITTENASCJXJ;YJ,WHEREQDEFINESTHECONTOURTYPEBYTHELETTERO,H,ORIFOROUTER,HOLE,ORCONTOURS,THELASTELEMENTSAY,NANDM,RESPECTIVELYTRIANGULATION西安文理学院本科毕业设计(论文)第3页BASEDONTHECONTOURDATA,THETRIANGULATIONCANBEDEFINEDTOTHISEND,ATRIANGULARGRIDISUSEDTHATINPRINCIPLECOVERSTHEWHOLESCREENHOWEVER,ONLYPOINTSWITHINTHEOUTERCONTOURTHATARENOTWITHINTHEHOLECONTOURSHOULDBEUSEDANDDISPLAYEDATTHISSTAGE,INNERCONTOURSARENEGLECTEDTHISREQUIRESANALGORITHMTOTESTWHETHERAPOINTISBETWEENTHEOUTERANDHOLECONTOURSCONTOURENCLOSEDPOINTSFILTERINGASCANBESEENINFIG3,ASIMPLERULECANBEDEFINEDTOASSESSWHETHERAPOINTPIISWITHINTHECLOSEDCONTOURSWHENAHORIZONTALLINEISDRAWNINTHEPOSITIVEXDIRECTION,ITINTERSECTSANUMBEROFTIMESWITHTHECLOSEDCONTOURIFTHISNUMBERISODD,PIISWITHINTHECLOSEDCONTOURSTHUS,THENUMBEROFINTERSECTIONSNEEDSTOBECALCULATEDFIRST,WENEEDTOSELECTCONTOURPOINTPAIRSWHOSECOORDINATESENCLOSETHEYCOORDINATEOFTHEPOINTINFIG3,THESEPAIRSARE{CI,CI1}AND{CJ,CJ1}NOWWECANDEFINESTRAIGHTLINESTHROUGHTHESEPOINTPAIRSASTRAIGHTLINETHROUGHTWOSUBSEQUENTCONTOURPOINTSCIXI,YIANDCI1XI1,YI1CANBEDEFINEDASYAXB,WITHAYI1–YI/XI1–XIANDBYI–AXIFIG2DEFINITIONOFTHETHREETYPESOFCONTOURS西安文理学院本科毕业设计(论文)第4页FIG3VISUALIZATIONOFTHEALGORITHMTHATTESTWHETHERAPOINTISWITHINTHECLOSEDCONTOURSWHENTHISPROCEDUREISPERFORMEDFORALLPOINTS,WEGETONEINTERSECTIONFORP1ODD,ANDTHUSTHISPOINTISINSIDETHECLOSEDCONTOURS,TWOINTERSECTIONSFORP2OUTSIDE,ANDSOFORTHTESTINGWHETHERAPOINTISWITHINTHECLOSEDCONTOURSISCOMPUTATIONALLYLABORIOUSTHEREFORE,THEPROCEDUREMAYINCLUDEANINITIALSELECTIONOFTHETRIANGULATIONPOSITIONSTHATAREWITHINTHERECTANGLEDEFINEDBYTHEWIDTHANDHEIGHTOFTHEOUTERCONTOUR,ASISSHOWNBYTHEOUTERDOTTEDLINEINFIG3ADJUSTINGTHETRIANGULATIONGRIDSIZEANDPOSITIONITCANBEUSEFULFORTHEEXPERIMENTERTOADJUSTTHEGRIDSIZEANDPOSITIONOFTHETRIANGULATIONINREALTIMETHISCANBEDONEUSINGTHEPROCEDURESDESCRIBEDABOVE,WHICHAREALSOIMPLEMENTEDINTHESUPPLEMENTALSOFTWAREINTHESOFTWARE,THEPOSITIONCANBEADJUSTEDWITHTHEMOUSEANDGRIDSIZEBYTHEARROWKEYS,ASISILLUSTRATEDINFIG4A,BUTOTHERTYPESOFIMPLEMENTATIONSMAYBEEQUALLYUSERFRIENDLYCALCULATINGFACESANDBARYCENTRESANDPERFORMINGFINALPOINTFILTERINGUPTONOW,ONLYPOINTSTHATSPANTHETRIANGULARGRIDHAVEBEENUSED,WITHOUTEXPLICITFACENUMBERINGHOWEVER,THERECONSTRUCTIONALGORITHMREQUIRESEXPLICITINFORMATIONABOUTTHEVERTEXNUMBERSTHATCONSTITUTETHETRIANGLESEACHFACETRIANGLEISDEFINEDBYTHREEVERTICES,SOADEFINITIONOFALLFACESCOMPRISESANMBY3MATRIX,WITHASETOFTHREENUMBERSINEACHROWTHATREFERTOTHEVERTICESNOTETHATTHENUMBEROFFACESDOESNOTEQUALTHENUMBEROFVERTICESTHEFACESCANBECALCULATEDWITHABRUTEFORCEMETHOD,WHICHISWHYTHISALGORITHMISNOTUSEDDURINGTHEREALTIMEADJUSTMENTOFGRIDSIZEANDLOCATIONHAVINGDEFINEDTHEINDIVIDUALTRIANGLES,WECANCALCULATETHEBARYCENTRESOFTHEFACES,WHICHARETHEACTUALSAMPLEPOINTSWHERETHEGAUGEFIGUREWILLBERENDEREDLASTLY,TRIANGLESCROSSINGTHEINNERCONTOURSNEEDTOBEFILTEREDTOTHISEND,ALINEINTERSECTIONALGORITHMISNEEDEDTHEBASICQUESTIONIS,DOTHELINESBETWEENTWOPOINTPAIRS{P1,P2}AND{P3,P4},ASSHOWNINFIG5,COINCIDETHISCANSIMPLYBECALCULATEDBYPARAMETERIZINGVECTORSTHROUGHTHESELINESV12TTP2–P1P1ANDV34SSP4–P3P3WHEN0T1,V12TLIESBETWEENP1ANDP2,ANDTHEEQUIVALENTHOLDSFORTHEPARAMETERSTHEINTERSECTIONPARAMETERSCANBEFOUNDBYSOLVINGV12TV34SIFBOTHINTERSECTIONPARAMETERSAREBETWEENZEROANDONE,THELINESINTERSECTASCANBESEENINFIG4,ITCANHAPPENTHATATRIANGLELINECROSSESTHEHOLE,WHICHISUNWANTEDTOOVERCOMETHISPROBLEM,THEHOLECONTOURSHOULDBEINCLUDEDINTHELASTFILTERINGPROCEDUREWHENTHEEXPERIMENTERISSATISFIEDWITHTHETRIANGULATIONPARAMETERS,THEPOINTSVERTICES,FACES,ANDBARYCENTRESSHOULDBESAVEDASCREENSHOTOFTHEFINALRESULTFROMTHESUPPLEMENTALSOFTWAREISALSOEXPORTED,FORLATERREFERENCESEEFIG4B
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