the vidboard a video capture and processing peripheral for a distributed multimedia systemnew

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1、TheVidboard:AVideoCaptureandProcessingPeripheralforaDistributedMultimediaSystemJoelF.AdamandDavidL.TennenhouseMITLaboratoryforComputerScienceAbstract1IntroductionThispaperdescribesastand-alonenetwork-basedvideocaptureandprocessingperipheral(theVid-AsynchronousTransferMode[5](AT

2、M)isacommuni-board)foradistributedmultimediasystemcenteredcationparadigmthatofferssupportforseamlessbroad-aroundagigabit-per-secondAsynchronousTransferbandcommunicationacrossheterogeneousnetworkingMode(ATM)network.TheVidboardcapturesvideoenvironments,fromwide-areatothedesk-area[

3、8].ATMfromananalogNTSCtelevisionsourceandtransmitshasmanypropertieswhichmakeitwellsuitedtoittodeviceswithinthesystem.Devicescontrolthethetransportofreal-time(audioandvideo)informa-VidboardthroughasetofATMprotocols.Whereastion[1].Inturn,manyresearchgroupsaredesigningcaptureboard

4、stypicallygeneratevideostreamshavingdistributedmultimediasystemscenteredaroundATMfixedframeratecharacteristics,theVidboardiscapa-networks[12,6,4].bleofdecouplingvideofromthereal-timeconstraintsWiththeuseofATM,anewclassofdevicesispos-ofthetelevisionworld.Thisallowseasierintegrati

5、onsibleinwhichdevicesactassharednetworkresourcesofvideointothesoftwareenvironmentofcomputersys-andcommunicatewitheachotherthroughATM-basedtems.TheVidboardisbasedonafront-endframe-protocols.Intermsofmultimedia,examplesofsuchde-memoryprocessorarchitecturethatisalsocapableofvicesa

6、revideoandaudiocaptureboards,framestoresgeneratingfull-motionvideostreamshavingarangeandvideoservers.ofpresentation(picturesize,colorspace)andnetwork(traffic,pixelpacking)characteristics.Aseriesofex-ThispaperdescribesanATMnetwork-basedvideoperimentsarepresentedinwhichvideoistrans

7、mittedcaptureandprocessingperipheraldevicecalledtheVid-toaworkstationfordisplay.Framerateperformanceboard.TheVidboardwasdesignedinthecontextofandaremotevideosourcecontrolmodelaredescribed.theViewStationproject[12].TheViewStationsys-temisanall-digitaldistributedmultimediasystemc

8、en-Keywords:ATM,digitalvideo,distributedsystems,tereda