1、A Referencenumber ISO113152:1997 (E) INTERNATIONAL STANDARD ISO 113152 Firstedition 19971115 PhotographyProjectioninindoor rooms Part2: Screenluminancetestforstillandvideo projection PhotographieProjectionensalles Partie2:Essaideluminancedelcranpourpro jectionfixeetvidoISO113152:1997(E) ISO1997 Allr
2、ightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproduced orutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingand microfilm,withoutpermissioninwritingfromthepublisher. InternationalOrganizationforStandardization Casepostale56 CH1211Genve20 Switzerland Inte
3、rnet centraliso.ch X.400 c=ch;a=400net;p=iso;o=isocs;s=central PrintedinSwitzerland ii Foreword ISO(theInternationalOrganizationforStandardization)isaworldwide federationofnationalstandardsbodies(ISOmemberbodies).Theworkof preparingInternationalStandardsisnormallycarriedoutthroughISO technicalcommit
4、tees.Eachmemberbodyinterestedinasubjectforwhich atechnicalcommitteehasbeenestablishedhastherighttoberepresented onthatcommittee.Internationalorganizations,governmentalandnon governmental,inliaisonwithISO,alsotakepartinthework.ISO collaboratescloselywiththeInternationalElectrotechnicalCommission (IEC
5、)onallmattersofelectrotechnicalstandardization. DraftInternationalStandardsadoptedbythetechnicalcommitteesare circulatedtothememberbodiesforvoting.PublicationasanInternational Standardrequiresapprovalbyatleast75%ofthememberbodiescasting avote. InternationalStandardISO113152waspreparedbyTechnicalComm
6、ittee ISO/TC42, Photography. ISO 11315consistsofthefollowingparts,underthegeneraltitle PhotographyProjectioninindoorrooms : Part1:Screenilluminationtestforstillprojectors Part2:Screenluminancetestforstillandvideoprojection Part3:Projectionreflectingscreens Part 4:ReflectingprojectionscreensClassific
7、ationand measurementofreflectedscreenluminancelevelsandsound attenuation AnnexesAandBofthispartofISO11315areforinformationonly.INTERNATIONALSTANDARD ISO ISO113152:1997(E) 1 PhotographyProjectioninindoorrooms Part2: Screenluminancetestforstillandvideoprojection 1Scope ThispartofISO11315specifiestheme
8、asurementofscreenluminancelevel,asseenbya (seated)viewerforalltypesofpurelyopticalstillprojectionindarkenedprojectionrooms.Since theopticalcharacteristicsofthesurfaceofthisscreenhaveadirectbearingonluminance,the screenshallbeconsideredanintegralpartoftheprojectionsystemforthispartofISO11315. Astanda
9、rdizedlightmeasuringsystemallowscomparisonofscreenluminancevaluesfor differentprojectionsystemsusedalternatelyinpracticaluse. 2Normativereferences Thefollowingstandardscontainprovisionswhich,throughreferenceinthistext,constitute provisionsofthispartof11315.Atthetimeofpublication,theeditionsindicated
10、werevalid.All standardsaresubjecttorevision,andpartiestoagreementsbasedonthispartofISO11315 areencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthe standardsindicatedbelow.MembersofIECandISOmaintainregistersofcurrentlyvalid InternationalStandards. ISO2910:1990, CinematographyScr
11、eenluminancefortheprojectionofmotion pictureprintsinindoortheatresandreviewrooms. ISO113151:1997, PhotographyProjectioninindoorroomsPart1:Screen illuminationtestforstillprojectors. CIENo.15.2:1986, Colorimetry(2ndedition). CIENo.69:1987, MethodsofCharacterizingIlluminanceMetersandLuminance MetersPer
12、formance,CharacteristicsandSpecifications.ISO113152:1997(E) ISO 2 3Definitions ForthepurposesofthispartofISO11315,thefollowingdefinitionsapply. 3.1luminance: Thequotientofthefluxleaving,arrivingatorpassingthroughanelementof surfaceandpropagatedindirectionsdefinedbyanelementaryconecontainingthegiven
13、directionbytheproductofsolidangleoftheconeandtheareaoftheorthogonalprojectionof theelementofsurfaceonaplaneperpendiculartothegivendirection. CIEPubl.No.17 3.2screen: Alightreflectingorlighttransmittingsurfacewithdefinedopticalpropertiesforthe purposeofprojection.InthispartofISO11315,screenmeansthesc
14、reenpictureareaofthe completeinstalledprojectionscreenonlyappropriatetotheprintformat(slide)andprojection systeminuse. 3.3theatricalprojection: Anindoorpublicprojectionsystem(e.g.inmultipurposehalls, auditoriumsofuniversities,cinemas,etc.) 3.4viewingarea: Alimitedareaforthepreferablyseatedviewers.It
15、allowsgoodviewing conditionsindependentoftherelativedimensionsoftheprojectionscreenarea.(SeeannexA, A.5.) 3.5stillprojection: Allprojectionmethodswithoneormoreprojectorsforslides,overhead projectiontransparencies,episcopicpicturesforprojectionandtransparentLCDs. 3.6uniformityratio, g 2 : Theratiooft
16、helowestmeasuredilluminance/luminancetothehighest measuredilluminance/luminance,e.g. L min /L max (x100in%). CIEPubl.No.17 4Testmethodfordeterminingthescreenluminance Thedistributionofluminanceoverthescreensurfacefromacompleteprojectioninstallation (i.e.includingprojectorandscreeninaprojectionroom)i
17、sinfluencedbyimpinginglight generatedbytheprojector(not byroomlighting),andthepropertiesofthescreen. Theluminancetowardstheviewingareaisdirectlydependentontheangleofthereflected(or transmitted)lightbythescreensurfaceaswellasontheviewingposition.Itisexpressedasa curvebytheluminancefactorindicatrix(se
18、enotebelow).Toachievethis,theluminance distributionshallbedeterminedatthreetestpoints(seefigure1)forthreeselectedviewing positions. NOTETheluminancefactorindicatrixwillbecoveredinISO113154whichisbeingprepared.ISO ISO113152:1997(E) 3 Key w Widthoftheprojectedimage h Heightoftheprojectedimage NOTEThef
19、inallocationofrelevanttestpointsisdeterminedbythescreenratioactuallyusedduringprojection. Figure1Locationofthetestpoints(123)onthescreen Luminanceshallbemeasuredfromthreepositionsofthemeasuringdeviceintheviewingarea (seefigure2,BAC)tothreetestpoints(123)onthescreen. 5Measurementofscreenluminance 5.1
20、Preconditioning Thepreparationprocedureshallbethesameasforthemeasurementofscreenillumination accordingtoISO113151:1997,subclause4.1. 5.2Measuringdevice Thescreenluminanceshallbemeasuredwithaluminancemeterhavingarecommendedfield anglenotgreaterthan1,5andthespectralsensitivityofaStandardColorimetricOb
21、server (CIEPubl.No.15.2). Themeasuringinaccuracyshallnotexceed10%.Theluminancemetershallcomplywiththe requirementsofclassB(CIEPubl.No.69).ISO113152:1997(E) ISO 4 Key w Screenwidth x Distancefromscreentolastrowofseats BAC Positionofmeasuringdevice R Lastrowofseating Figure2Positionofmeasuringdevicein
22、viewingarea 5.3Positionofmeasuringdeviceintheviewingarea Themeasurementsshallbetakenwiththeluminancemeterlocatedapproximately1mabove theflooronthelongitudinalaxisoftheprojectionroominthecentreofthemainseatingarea andataposition2/3ofthedistancefromthescreentothelastrowofseats.Toensure satisfactoryper
23、formanceinallpartsoftheprojectionroom,measurementsshallalsobetaken withtheluminancemeterlocatedapproximately1mabovethefloorattwopointsona transverselineacrosstheprojectionroom,ataposition2/3ofthedistancefromthescreento thelastrowofseats(measuredfromthescreen)andadistanceof1/2ofthescreenswidthto each
24、sideofthelongitudinalaxisoftheprojectionroom. 5.4Testpointsonthescreen Thescreenluminanceshallbemeasuredasshowninfigure1atthreetestpoints(123). 5.5Measurementofluminanceinthecentreofthescreen (L 2 ) Thescreenluminanceisdeterminedbytheluminancevalue L 2 ,measuredatthecentraltest point2onthescreen(see
25、figure1),andshallbemeasuredfromthetestpositionAinthe viewingarea. 5.6Measurementofluminanceatpoints1and3 Thescreenluminanceatpoints1and3isdeterminedbyluminancevalues L 1 and L 3 measured fromthetestpositionsBandCintheprojectionroom. Thisresultsinthefollowingvalues: FrompositionB: L 1B and L 3B Fromp
26、ositionC: L 1C and L 3CISO ISO113152:1997(E) 5 6Uniformityratio g 2 ofscreenluminance Calculatetheuniformityratio g 2 fromthefollowingequation: g LLLLL LLLLL 2 1B 3B 1C 3C 2 1B 3B 1C 3C 2 m i n ., max. , , , , x100% = (calculatedtoonedecimalplace) 7Testresults Givetheresultsofthetestaccordingtothisp
27、artofISO11315intheformoftheexample below. totestpointonscreen fromposition luminancecd/m 2(centre) A(centre) L 2 =. 1BL 1B =. 3BL 3B =. 1CL 1C =. 3CL 3C =. uniformityratio g 2 =.% 8Uniformityofluminancedistribution Overthecompletescreensurface,thescreenluminanceshallappeartobeevenand substantiallysy
28、mmetricalaboutthescreencentre.Thisshallbecheckedfrommultiplepositions oftheviewingarea. 9Frequencyofmeasurement Toaccountforchangesinthelighthandlingpropertiesofaprojectionsysteminthecourseof time(e.g.ageingofthelampreflector,darkeningofthebulb,misadjustmentandreductionof theprojectionpropertiesofth
29、escreen),itisrecommendedthattheluminancemeasurementbe repeated,atleastinthecentreofthescreen,atintervalsofthreemonths.ISO113152:1997(E) ISO 6 AnnexA (informative) Measuringmethods A.1General Itisbecomingincreasinglycommontodaytouseseveralalternativetypesofprojectionduringa singleshow.Thisfactmakesit
30、necessarytosetupastandardizedtechniqueformeasuring lightonascreenforall projectionmethods,inordertoreachdefinedprojectionconditions duringapresentationwithdifferenttypesofprojectors. AllprojectionmethodsincludedinthispartofISO11315involveopticalprojection,i.e.the projectionofanimageontoaprojectionsc
31、reen byopticalmeans.Electronicprojectionmethods whichprojectimagesontomonitortypescreens (e.g.TVmonitors,TVreceivers,computers, etc.)donotfallwithinthescopeofthispartofISO11315.Furthermore,holographicsystems arenotwithinthescopeofthispartofISO11315. Measuringmethodsarerequiredforthe screenilluminanc
32、e: ISO113151,forstillprojection (revisionofISO8341:1989) screenluminance: thispartofISO11315,forstillprojection ISO2910:1990,formotionpictureprojection distributionofscreenluminance: ISO113153forrearprojection screens,stillprojection ISO113154(whichisbeingprepared) forfrontprojectionscreens,stilland
33、 motionpictureprojection A.2Recommendedluminancelevel FormotionpictureprojectionseeISO2910:1990. A.2.1Luminancelevelofscreencentre Forallkindsofpublicprojection,theluminancelevelofthescreencentre L 2 ,50cd/m 15cd/m,foreachformatofinterestwillberecommendedifpossible. A.2.2Acceptablelimitsofscreenlumi
34、nance Therangeofthescreenluminanceacceptableforindoortheatresisbasedonpractical experienceandlimitations.Itshouldbeunderstoodthatthenominallightlevelinreviewrooms hasbeenestablishedat50cd/mforallformats.Therefore,inordertoreproducethepictorial qualitiesseeninthereviewroom,thevaluefortheatresshouldal
35、sobe50cd/m.However, satisfactoryperformancescanbeobtainedwithinthestatedlimits.Thelowerlimitof35cd/mis dictatedbytheneedtomaintainsufficientluminancetoperceivecolouranddetail,especiallyin darkpictures. NOTEProjectioninsemidimmedrooms(validinthefieldofeducation,advertisingandpromotion)needs separatec
36、onditionsfortherelationshipbetweentheprojectionlightandthedimmedlightintheprojectionroom.ISO ISO113152:1997(E) 7 A.2.3Evennessofluminancelevel Thelimitof g 2 shallbeatmin.50%. A.2.4Spectraldistributionofluminance Whenusingincandescenttungstenlight,thelightreflected(ortransmitted)fromthescreen shallh
37、aveaspectraldistributioncomparabletothatofablackbodyatacolourtemperatureof 3 200K350K. WhenusingXenonlightsources,thelightreflected(ortransmitted)fromthescreenshallhave aspectraldistributioncomparabletothatofablackbodyatacolourtemperatureof 5 400K400K. A.3Multipleprojectoradjustment A.3.1Luminancema
38、tchforprojectioninstallationsofsameformat Theluminancefromallprojectorsintendedforuseinthecontinuousviewingofmaterialsofthe sameformatshallnotvarybymorethan10cd/matthescreencentre. A.3.2Luminancematchforprojectioninstallationsofdifferentformatsordifferent projectionsystems Theluminancefromallproject
39、orsintendedforuseinthesequentialviewingofmaterialsof differentformatsordifferentprojectionsystemsshallnotvarybymorethan15cd/matthe screencentre. A.3.3Colourtemperaturematch Thedifferenceincorrelatedcolourtemperatureofthelightreflected(ortransmitted)fromthe screenwhenusingprojectorsintendedforsequent
40、ialoperationshallnotbemorethan400K. A.4Projectionunits Thisprojectionsystemmeanstheinclusionofaprojectorandatransmissionscreeninasingle apparatus,inpracticeusedasmicrofilmreaders,devicesforslideprojectionoreditingtables.In practice,lightmeasurementsonthisprojectionsystemarelimitedtoluminancelevelonl
41、y, measuredfromastandardposition. A.5Distanceoflastrow6 . w Therelationship6 . w(distanceoflastrowtothescreenbasedon6timesthescreenswidth w) istheresultofmanyexperiencesfortheperceptionofsmallestdetailsbyaviewerinthelast rowduringtheprojection.Forallkindsofprojection(education,advertisingandpromotion included),thevalue6 . wshallnotbeexceeded.ISO113152:1997(E) ISO 8 AnnexB (informative) Bibliography 1ISO1755:1987, PhotographyProjectorslidesDimensions. 2ISO79431:1987, PhotographyOverheadprojectorsPart1:Project
