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第1页共7页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共7页...../...../DesigningRoomLightingForVideoconferencingThenewDesignGuidefromIESNAistheclosestthingproAVhastoaninternationalstandardforvideoconferencinglightingdesign.Source:PROAVMagazinePublicationdate:December1,2005ByTimCape,CTS-DWhiletheultimategoalinvideoconferencingisgoodinteractivitybetweennear-andfar-endrooms,onecommonlightingdesignproblemcanbesummedupinaquestionthat'sremainedconstantthroughouttheevolutionofvideoconferencingtechnology:Howcanyouprovidegood,comfortablelightingtooptimizethecameraandvideocodecoperationinanarchitecturalenvironmentratherthaninastudio?Althoughit'safairlysimplequestion,theanswercanbequitecomplicated.Theremustbesomelightintheroomofthespaceyou'redesigningjustforthecameratoproduceanimage,butmakingthatimagelookgoodwhilemaintainingagoodprojectedvideoimagecanbeeasiersaidthandone.Ontopofjustgettingthecameratoproduceadecentimage,youalsohavetobeconcernedaboutwhatthecodecwilldotothatimage(particularlyatlowbitrates),puttingmoreconstraintsonnotjustthelightingdesignbutalsotheinteriordesignoftheroomitself—onceagaingoingbeyondthetenetsofabasicAVsystem.第2页共7页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共7页Upuntilnow,AVprofessionalshaven'thadmuchconsistentguidanceonvideoconferencingroomlightingdesign,butthenewdesignguide,offeredbytheIlluminatingEngineeringSocietyofNorthAmerica(IESNA),givesthemanauthoritativeplacetostart.ThenewdesignguideIndevelopmentsince2002,the“VideoconferencingLightingDesignGuide,”DG-17-05,isnowavailableforpurchasethroughtheIESNAwebsite(..iesna.org).Itincludesawiderangeofrecommendedcriteriaandgeneralrecommendationsforapproachestolightingforvideoconferencingfacilities.It'sspecificallyorientedtowardsmall-tomid-sizedvideoconferencingroomswithasinglecameraaxis(fromdisplaystoseatedparticipants).Itdoesn'tspecificallycoverdual-axisroomsthatincludeapresenternearthedisplaysorlargerfacilities,thoughmuchofthecriteriacanbeappliedtothiswiderrangeofrooms.TheGuideisintendedtosomeextentfordesignersbothwithandwithoutabackgroundinlightingdesign.TheolddesignproblemBeforeansweringthequestionpresentedaboveabouthowtooptimizethecameraandvideocodecoperationinanarchitecturalenvironment,youmustunderstandseveralbasicandsometimesconflictingrequirements.Andit'snotjustabouttheluminairesthatemitthelight,it'sabouttheroom,too.Theprimarytasksintermsoflightingare:Lighttheparticipantsforgoodvideo.Thisinvolveslimitingthevariationinlightlevelenoughtoallowthecameratoreproducethefullrangeoflightandshadowinthepicture.Atthesametime,thereneedstobeenoughvariationinthepicturetokeepitfromlooking“flat”withnoshadowordepth.Lighttheroomtocomplementtheparticipants.Thismeanspayingattentiontothelightingforthewalls,floor,andceilingareasthatmightbeinthecameraview.Coordinatetheroomfinishesfromthestandpointofcolor,contrast,andpattern,andhowtheyrelatetothepeopleinthepicture.Thisalsoinvolvesconsiderationofthetypeoffinish,andhowitmayaffecttheimagepickedupbythecameraandtransmittedtotheremotesite.Forexample,reflective,orspecular,finishessuchaschromecancreateproblemsforthecamerabycreatinganexcessivelybrightspotintheimage.Sometimestherearemoreparticularconstraintsplacedonthelightingsystemwhenspecialcamerasorhigherthannormalcolorrenderingareneededforspecializedapplicationslikeretail,fashion...