资源描述:
《种基于小波的眼伪影校正的脑电图去噪技术毕业论文外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、AWAVELETBASEDDE-NOISINGTECHNIQUEFOROCULARARTIFACTCORRECTIONOFTHEELECTROENCEPHALOGRAMTatjanaZikov,StéphaneBibian,GuyA.Dumont,MihaiHuzmezanDepartmentofElectricalandComputerEngineering,theUniversityofBritishColumbia,BC,CANADA.Abstract–Thispaperinvestigatesawaveletbaseddenoisingofthee
2、lectroencephalogram(EEG)signaltocorrectforthepresenceoftheocularartifact(OA).Theproposedtechniqueisbasedonanover-completewaveletexpansionoftheEEGasfollows:i)astationarywavelettransform(SWT)isappliedtothecorruptedEEG;ii)thethresholdingofthecoefficientsinthelowerfrequencybandsisperf
3、ormed;iii)thede-noisedsignalisreconstructed.ThispaperdemonstratesthepotentialoftheproposedtechniqueforsuccessfulOAcorrection.Theadvantageoverconventionalmethodsisthatthereisnoneedfortherecordingoftheelectrooculogram(EOG)signalitself.Theapproachworksbothforeyeblinksandeyemovements.
4、Hence,thereisnoneedtodiscriminatebetweendifferentartifacts.Toallowforapropercomparison,thecontaminatedEEGsignalsaswellasthecorrectedsignalsarepresentedtogetherwiththeircorrespondingpowerspectra.Keywords-stationarywavelettransform(SWT),electroencephalogram(EEG),electrooculogram(EOG
5、),ocularartifact(OA).I.INTRODUCTIONTheelectroencephalogram(EEG)givesresearchersanon-invasiveinsightintotheintricacyofthehumanbrain.Itisavaluabletoolforcliniciansinnumerousapplications,fromthediagnosisofneurologicaldisorders,totheclinicalmonitoringofdepthofanesthesia.Forawakehealth
6、ysubject,normalEEGamplitudeisintheorderof20-50μV.TheEEGisverysusceptibletovariousartifacts,causingproblemsforanalysisandinterpretation.Incurrentdataacquisition,eyemovementandblinkrelatedartifactsareoftendominantoverotherelectrophysiologicalcontaminatingsignals(e.g.heartandmuscleac
7、tivity,headandbodymovements),aswellasexternalinterferencesduetopowersources.Eyemovementsandblinksproducealargeelectricalsignalaroundtheeyes(intheorderofmV),knownaselectrooculogram(EOG),whichspreadsacrossthescalpandcontaminatestheEEG.Thesecontaminatingpotentialsarecommonlyreferredt
8、oasocularartifact(OA).Therejectio