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A novel feature extraction method for machine learning based on surface electromyography from healthy brain

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Abstract

Feature extraction is one of most important steps in the control of multifunctional prosthesis based on surface electromyography (sEMG) pattern recognition. In this paper, a new sEMG feature extraction method based on muscle active region is proposed. This paper designs an experiment to classify four hand motions using different features. This experiment is used to prove that new features have better classification performance. The experimental results show that the new feature, active muscle regions (AMR), has better classification performance than other traditional features, mean absolute value (MAV), waveform length (WL), zero crossing (ZC) and slope sign changes (SSC). The average classification errors of AMR, MAV, WL, ZC and SSC are 13%, 19%, 26%, 24% and 22%, respectively. The new EMG features are based on the mapping relationship between hand movements and forearm active muscle regions. This mapping relationship has been confirmed in medicine. We obtain the active muscle regions data from the original EMG signal by the new feature extraction algorithm. The results obtained from this algorithm can well represent hand motions. On the other hand, the new feature vector size is much smaller than other features. The new feature can narrow the computational cost. This proves that the AMR can improve sEMG pattern recognition accuracy rate.

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Acknowledgements

This work was supported by grants of Natural Science Foundation of China (Grant Nos. 51575407, 51575338, 51575412, 61733011), Grants of National Natural Science Foundation of China (Grant Nos. 51505349, 51575407, 51575338, 51575412, 61733011) and the Grants of National Defense Pre-Research Foundation of Wuhan University of Science and Technology (GF201705). This paper is funded by Wuhan University of Science and Technology graduate students short-term study abroad special funds.

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Authors and Affiliations

  1. Key Laboratory of Metallurgical Equipment and Control Technology, Wuhan University of Science and Technology, Ministry of Education, Wuhan, 430080, China

    Gongfa Li, Jiahan Li, Ying Sun & Jianyi Kong

  2. School of Computing, University of Portsmouth, Portsmouth, PO1 3HE, UK

    Zhaojie Ju

  3. Research Center for Biomimetic Robot and Intelligent Measurement and Control, Wuhan University of Science and Technology, Wuhan, 430081, China

    Gongfa Li

  4. Institute of Precision Manufacturing, Wuhan University of Science and Technology, Wuhan, 430081, China

    Gongfa Li

  5. Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan, 430080, China

    Ying Sun & Jianyi Kong

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  1. Gongfa Li
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Correspondence to Gongfa Li.

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Li, G., Li, J., Ju, Z. et al. A novel feature extraction method for machine learning based on surface electromyography from healthy brain. Neural Comput & Applic 31, 9013–9022 (2019). https://doi.org/10.1007/s00521-019-04147-3

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