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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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