synchronous capture of image sequences from multiple cameras

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1、SynchronousCaptureofImageSequencesfromMultipleCamerasP.J.Narayanan,PeterRander,TakeoKanadeCMU-RI-TR-95-25TheRoboticsInstituteCarnegieMellonUniversityPittsburgh,Pennsylvania15213December1995©1995CarnegieMellonUniversityAbstractSeveralapplicationstodayneedtodigitallycaptureeveryfra

2、meofavideostreamoracamera.Theserangefrompsychologicalstudiestosurveillancetovideoprocessing.Someapplicationsalsoneedtocapturetheframesfrommultiplevideostreamssynchro-nouslyandtocorrelatethemwithoneanother.Avideostreamofcolordata,though,rep-resentsasustainedbandwidthofabout26Mbyte

3、spersecondfromthedigitizinghardwaretoasecondarystoragedevicewithoutcompression.Thisrateiswellbeyondthecapabilitiesofmostaffordablesystemstoday.Wepresentasystemthatcansynchronouslycaptureeveryframe--oranyuser-speci-fiedsubsetofthem--frommultiplecamerasatfullresolutionandstorethemo

4、nareg-ularsecondarystoragedevice.TheoutputsofthecamerasarerecordedontapeusingconventionalVCRs.TheVerticalIntervalTimeCode(VITC)isinsertedontoeachstreambeforerecording.Eachtapeisplayedback,repeatedlyundercomputercontrolifnecessary,off-lineonaneditingVCRtograbtheframesusingacommerc

5、ialdigitizer.TheVITCdataisusedtodirectlyidentifytheframeswhilethetapeisplayedback.Webelievethisisthefirstsystemintheworldthatcancaptureeveryframefrommultiplevideostreamssynchronously,fullyscalableinthenumberofstreamsandthedurationofcapture.Finally,thesystemisinexpensive,costing$5

6、00perchannel.Wepresentthesys-tem,itscomponents,andtheprocessofverifyingthecapturingprocess.Wethendiscussafewcomputervisionresearchprojectsmadefeasiblebysuchasystem.1IntroductionSeveralapplicationstodayneedtodigitallycaptureeveryframeofavideostreamfromacamera.Theserangefromimage/v

7、ideoprocessingtopsychologicalstudiestosurveillance.Manyalsoneedtocapturetheframesofmultiplevideostreamssynchronouslyandcorrelatethedatafrommultipleviewingangles.Avid-eostreamfromacamerafollowingtheNTSCstandardsproduces30framesofvideodatapersecond,eachofwhichistypicallydigitizedin

8、to480rowsof640pixelswithgraylevelvaluesr