Browsing by Author "Bista, Saroj"

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    A 3-channel Active Electrode EEG Device for the Classification of MotorImagery Brain waves for Brain Computer Interface
    (Pulchowk Campus, 2017-11) Bista, Saroj
    Thisthesisworkpresentsacosteffectivemethodtorecordbrainwavesignalsusing threechannelactiveelectrodeEEGdeviceandclassifybrainwavesrelatedtomotor imagery(MI)leftandrighthandmovement,basedonelectroencephalography(EEG) measuredfromthecentrallobe,thatcouldbeusedfortheBrainComputerInterface (BCI)systems.ThegoalofthisthesisistouseIndependentComponentAnalysis (ICA)fortheremovalofEEGartifacts,andthenextractthebrainwavesfeaturesforMI lefthandandMIrighthandmovementusingWaveletDecomposition(WD).The‘Mor- let’motherwaveletisusedforwaveletdecompositionasitshowsbetterperformance foranalysisofnon-stationarybiomedicalsignalslikeEEG.Thebrainwavefeatureslike MaximumPoweramongalldecompositionlevel(MMP),Frequencycorrespondingto MMP(MAF),andMaximumAmplitudeofthesignalwithMAF(MMA)ischosen astheclassificationfeaturesfortheclassificationofMIbrainwaves.Theclassifica-tionofMIbrainwavesignalsisdoneusingLinearDiscriminantAnalysis(LDA)which showedtheaccuracyof81.6%.Thus,thedesignedthreechannelactiveelectrodeEEG deviceusedshowedgoodperformanceforrecordingEEGsignals.Furthermore,signal preprocessingalgorithmICA,featureextractionmethodWaveletDecomposition,and classificationmethodLDAshowedgoodperformancefortheclassificationofMIleft handandMIrighthandactivities.