基于条件经验模式分解和串并行CNN的脑电信号识别

唐贤伦; 李伟; 马伟昌; 孔德松; 马艺玮

doi:10.11999/JEIT190124

基于条件经验模式分解和串并行CNN的脑电信号识别

doi: 10.11999/JEIT190124

重庆邮电大学自动化学院重庆 400065

基金项目: 国家自然科学基金(61673079, 61703068)，重庆市基础研究与前沿探索项目(cstc2018jcyjAX0160)

详细信息

作者简介:
唐贤伦：男，1977年生，教授，博士，研究方向为智能系统与机器人，模式识别理论与应用

李伟：男，1996年生，硕士生，研究方向为深度学习、脑电信号识别

马伟昌：男，1995年生，硕士生，研究方向为机器人控制

孔德松：男，1993年生，硕士生，研究方向为深度学习

马艺玮：女，1980年生，副教授，博士，研究方向为智能信息处理

通讯作者:
李伟　cqyddxliwei@foxmail.com

中图分类号: TP391.4
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出版历程
- 收稿日期: 2019-03-01
- 修回日期: 2019-11-22
- 网络出版日期: 2019-12-14
- 刊出日期: 2020-06-04

Conditional Empirical Mode Decomposition and Serial Parallel CNN for ElectroEncephaloGram Signal Recognition

School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The National Natural Science Foundation of China (61673079, 61703068), The Basic Research and Frontier Exploration Project of Chongqing (cstc2018jcyjAX0160)

摘要

摘要:
针对运动想象脑电信号(EEG)的非线性、非平稳特点，该文提出一种结合条件经验模式分解(CEMD)和串并行卷积神经网络(SPCNN)的脑电信号识别方法。在CEMD过程中，采用各阶固有模式分量(IMF)与原始信号的相关性系数作为第1个IMF筛选条件，在此基础上，提出各阶IMF之间的相对能量占有率作为第2个IMF筛选条件。此外，为了考虑脑电信号各个通道之间的特征和突出每个通道内的特征，该文提出SPCNN网络模型对进行CEMD过程后的脑电信号进行分类。实验结果表明，在自行采集的脑电数据集上平均识别率达到94.58%。在公开数据集BCI competition IV 2b上平均识别率达到82.13%，比卷积神经网络提高了3.85%。最后，在自行设计的智能轮椅脑电控制平台上进行了轮椅前进、左转和右转在线控制实验，验证了该文算法对脑电信号识别的有效性。
- 脑电信号识别 /
- 经验模式分解 /
- 卷积神经网络 /
- 特征提取 /
- 智能轮椅
Abstract:
For the non-linear and non-stationary characteristics of motor imagery ElectroEncephaloGram (EEG) signals, an EEG signal recognition method based on Conditional Empirical Mode Decomposition (CEMD) and Serial Parallel Convolutional Neural Network (SPCNN) is proposed. In the CEMD process, the correlation coefficient between the Intrinsic Mode Functions (IMFs) and the original signal is used as the first condition to select IMFs. Based on this, the relative energy occupancy rates between the IMFs are proposed as the second condition to select IMFs. Further, to consider the characteristics between the EEG signal channels and highlight the features in each EEG signal channel, a SPCNN model is proposed to classify the processed EEG signals. The experimental results show that the average recognition rate reaches 94.58% on the dataset collected by ourselves. And the average recognition rate reaches 82.13% on the BCI competition IV 2b dataset, which is 3.85% higher than the average recognition rate of convolutional neural network. Finally, the online control experiments are carried out on the designed intelligent wheelchair platform, which proves the effectiveness of the proposed algorithm for EEG signals recognition.
- Electro Encephalo Gram(EEG) recognition /
- Empirical Mode Decomposition (EMD) /
- Convolutional Neural Network (CNN) /
- Feature extraction /
- Intelligent wheelchair

HTML全文

图 1 串并行卷积神经网络结构图

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图 2 Emotiv脑电采集仪

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图 3 Emotiv脑电采集仪电极安放位置

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图 4 单次脑电信号采集过程

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图 5 设定不同的阈值$\alpha $时识别率情况

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图 6 设定不同的阈值$\beta $时识别率情况

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图 7 采用不同处理方法的识别准确率对比

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图 8 智能轮椅系统结构图

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表 1 不同算法对5受试者脑电信号的识别准确率(%)

算法	CSP	ACSP	DBN	CNN	STFT-CNN	SPCNN	本文CEMD-SPCNN
S01	65.00	77.50	87.08	86.25	88.75	90.42	93.33
S02	81.67	82.92	87.50	87.92	89.17	91.25	94.17
S03	98.33	97.08	95.83	95.83	96.67	97.08	99.16
S04	76.25	78.33	83.33	85.42	85.42	86.25	89.58
S05	95.42	96.25	93.75	91.67	92.50	94.17	96.67
均值	83.33	86.41	89.50	89.42	90.50	91.83	94.58
方差	190.01	91.88	26.51	18.61	18.18	16.62	13.02

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表 2 不同算法对BCI competition IV 2b数据集的识别准确率(%)

算法	Chin	Gan	Coyle	CSP	ACSP	DBN	CNN	STFT-CNN	SPCNN	本文CEMD-SPCNN
B01	70.00	71.00	60.00	66.56	67.50	66.56	72.22	75.00	76.39	80.56
B02	61.00	61.00	56.00	57.81	55.31	62.50	61.03	61.76	63.24	64.71
B03	61.00	57.00	56.00	61.25	62.19	60.00	61.11	62.50	62.50	64.58
B04	98.00	97.00	89.00	94.06	94.69	96.87	98.65	98.65	99.32	99.32
B05	93.00	86.00	79.00	80.63	76.88	82.19	86.48	87.16	87.84	88.51
B06	81.00	81.00	75.00	75.00	75.94	77.50	79.17	80.56	81.25	83.33
B07	78.00	81.00	69.00	72.50	71.25	76.56	78.47	77.08	79.17	81.25
B08	93.00	92.00	93.00	89.38	89.38	88.75	86.18	86.18	86.84	90.13
B09	87.00	89.00	73.00	85.63	81.25	85.94	81.25	82.64	84.03	86.81
均值	80.22	79.44	72.22	75.86	74.93	77.43	78.28	79.06	80.06	82.13
方差	192.19	190.03	181.69	158.75	157.50	155.85	147.92	138.63	137.52	129.78

下载: 导出CSV

表 3 各类操作在线识别准确率(%)

操作	直行	左转	右转
S01	96	84	86
S02	94	90	82
S03	98	88	92

下载: 导出CSV

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