基于非负矩阵分解的癫痫脑电自动检测

Journal of Jilin University(Information Science Edition)(2017)

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Abstract
针对多分类癫痫检测算法因特征维数多而导致识别率不理想的问题,提出了一种基于分数阶傅里叶变换(FrFT:Fractional Fourier Transform)和非负矩阵分解(NMF:Non-negative Matrix Factorization)的癫痫脑电自动识别算法.首先采用FrFT对脑电信号进行时频聚焦,并利用短时傅里叶变换(STFT:Short-Time FourierTransform)提取脑电信号的时频特征;再应用NMF对提取的时频特征进行降维;最后将降维后的特征输入到支持向量机(SVM:Support Vector Machine)分类器中进行识别.实验结果表明,该方法能识别正常、癫痫发作间期和癫痫发作期3类脑电信号,其分类准确率可达98.8%.
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