论文标题
使用变分模式分解的EEG信号分类
EEG Signal Classification using Variational Mode Decomposition
论文作者
论文摘要
癫痫每年影响约1%的人口,其特征是大脑中神经元的异常和突然的超同时激发。脑电图(EEG)是记录脑信号并诊断癫痫和癫痫病例的最广泛使用的方法。在本文中,我们在分析中使用变分模式分解方法(VMD)来对癫痫发作/无发作信号进行分类。与其他方法(例如经验模式(EMD)和Hilbert-huang变换)相比,该技术使用变异性非递归模式分解,这些方法会递归分解信号,从而使它们更容易受到噪声和采样率的影响。 VMD将信号分解到其组件中,该组件称为主模式。在我们的分析中,研究了分解信号的4个特征,即Renyi熵,二阶差异图(SODP),第四阶差异图(FODP)和平均幅度,无论是单独的还是使用等级方法,同时考虑了所有4个功能。分解信号模式的SODP是椭圆结构。从分解信号模式的SODP测量的95%置信椭圆面积已被用作特征,以区分癫痫发作癫痫发作EEG信号,以区分无癫痫发作的EEG信号。对于分类,使用了带有背部传播算法的多层感知器(MLP)作为训练方法。当将特征单独用于分类时,获得了很高的精度,并且使用排名方法时获得了更高的准确性。
Epilepsy affects about 1% of the population every year, and is characterized by abnormal and sudden hyper-synchronous excitation of the neurons in the brain. The electroencephalogram(EEG) is the most widely used method to record brain signals and diagnose epilepsy and seizure cases. In this paper we use the method of Variational Mode Decomposition (VMD) in our analysis to classify seizure/seizure free signals. This technique uses variational non recursive mode decomposition, in comparison to other methods like Empirical Mode (EMD) and Hilbert-Huang transform which recursively decompose the signals, making them more susceptible to noise and sampling rate. VMD decomposes a signal into its components which are called principal modes. In our analysis, 4 features of the decomposed signals namely Renyi Entropy, second order difference plot (SODP), fourth order difference plot(FODP) and average amplitude are investigated, both individually and using a ranking methodology considering all 4 features at the same time. The SODP of decomposed signal modes is an elliptical structure. The 95% confidence ellipse area measured from the SODP of the decomposed signal modes has been used as a feature in order to discriminate seizure-free EEG signals from the epileptic seizure EEG signal. For the classification, a Multilayer Perceptron(MLP) with back propagation algorithm as the training method was used. A high percentage of accuracy was obtained when the features were used individually for classification and an even higher degree of accuracy was obtained when the ranking methodology was used.