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1、外文原文TheImplementationofEmbeddedImageAcquisitionBasedonV4L2LUYinliYUHongliZHANGPengpengPhysicalElectronicsDepartmentofElectricalEngineeringofUniversityofSouthChinaHengyangPeople’sRepublicofChinaluyinli198755@tianqing924@A
2、bstractInviewofthecurrentsituationofthelessembeddedLinuximageacquisitionapplicationbasedonV4L2(VideofLinuxTwo)embeddedimageacquisitionsystembasedonV4L2isdesigned.S3C6410isadoptedashardwaredevelopmentplatfmLinuxassoftware
3、platfm.AfterloadingthedriverofCMOScameraOV9650otherrelativedriversimageacquisitionapplicationsonthebasisofV4L2iscompiledadoptingdoubleframebuffertoreduceCPUutilizationratetoaccomplishacquisitionpreviewimage.Withthesizeof
4、400480theframerateof15framespersecondthepicturecollectedshowsclearlyithasgoodquality.Theexperimentresultindicatesthatthesystemhasgoodscalabilityitoffersanewideafembeddedhhelddevices.KeywdsV4L2OV9650imageacquisitionS3C641
5、0doubleframebufferINTRODUCTIONThevideoimageprocessingtechnologyiswidelyusedinelectronictechnologycomputertechnology.Theimagefromacameraotherimageacquisitionequipmentsistransfmedmathematicallytogettheinfmationofdigitalima
6、gethenitisencodedfilteredenhancedrecoveredcompressedstedotherprocessesconductedbythecomputervisualimagesotherresultsfinallywillbereceived.Withthedevelopmentofembeddedtechnologythecurrentimageacquisitiontechnologyistransf
7、medfromtheanaloguetothedigital.Amongthemembeddedimageacquisitionattractsmemepeoplesattentionfitssuperiperfmance.Embeddedmicroprocessisthebestchoiceftheimageprocessingsystembecauseofitshighperfmancecosteffectivelowpower.S
8、amsungS3C6410hasARM11ceadopts6432bitinternalbusarchitecture.Italsoincludesmanypowerfulhardwareacceleratssuchasmotionvideoprocessingaudioprocesssoon.AnintegratedMFC(MultiFmatcodec)supptsencodingdecodingofinterfacecircuits
9、oon.BecauseOV9650registerscontrolprotocolSCCB(serialcameracontrolbus)canbecompatiblewithI2CsoweuseI2CofbackendplatfmtosimulateSCCBtoconfiguretheOV9650internalregisters.III.SOFTWAREDESIGNTherearetwostepstoachievetherealiz
10、ationofimagecollection:firstlyloadtherelatingdrivertoLinuxkernelonthebottomsecondlycompileimageacquisitionapplicationsonthetoptogetimagedatawhichwillbeshowedonLCDfinally.A.LoadtherelatingDriverBefecompilingtheapplication
11、sproceduredriversrelatedshouldbeloadedatfirst.Becausethekerneladoptedincludesthedriverssojustaddcrelativeconfigurationtothekernel.1)kernelconfiguration:Inthedirectyofkernelusethecomm“makemenuconfig“fkernelconfiguration:c
12、hooseDeviceDriversMultimediadeviceVideoflinuxloadvideo4linuxmoduletoprovideprogramminginterfacefvideodevicechooseDeviceDriversMultimediadevicesVideocaptureadaptersSamsungCameraInterfacedriversExternalCameraOVTOV965xaddth
13、esupptofCMOSimagesenstothekernel.Savetheconfigurationquit.2)generatekernelimage?Usethecommsbelow:makedep:readtheconfigurationfilecreatdependencytreecrespondingtotheconfigurationtodeterminecompileoptionsmakezImage:generat
14、ethekernelimagethatcansupptV4L2OV9650.WhenthekernelstartsifthereisthesameinfmationasfollowsitindicatesthatthedriverofOV9650hasbeenloadedsuccessfully:[CAM]OV9650initregstart...[CAM]OV9650initregend.Afterthesystemstartsitc
15、anautomaticallyidentifyOV9650SystemcallscanbeutilizedtoobtainequipmentinfmationtofacilitateapplicationdevelopmenttheIOoperationinterfacefunctionprovidedbyCMOSimagesensdrivercanrealizetherelevantoperation.B.ImageAcquisiti
16、onApplicationsV4LisarangeofinterfacefunctionsprovidedbyLinuxfvideodevicesapplicationstheimagedatacanbereadoutfromvideoequipmentbyusingAPIfunctions.1)V4L2driverstructureV4Lhastwoshtages:whendrivingprogramisbeingdesignedyo
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