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A sparse Bayesian learning based scheme for multi-movement recognition using sEMG

  • Shuai DingEmail author
  • Liang Wang
Scientific Paper
  • 218 Downloads

Abstract

This paper proposed a feature extraction scheme based on sparse representation considering the non-stationary property of surface electromyography (sEMG). Sparse Bayesian learning was introduced to extract the feature with optimal class separability to improve recognition accuracy of multi-movement patterns. The extracted feature, sparse representation coefficients (SRC), represented time-varying characteristics of sEMG effectively because of the compressibility (or weak sparsity) of the signal in some transformed domains. We investigated the effect of the proposed feature by comparing with other fourteen individual features in offline recognition. The results demonstrated the proposed feature revealed important dynamic information in the sEMG signals. The multi-feature sets formed by the SRC and other single feature yielded more superior performance on recognition accuracy, compared with the single features. The best average recognition accuracy of 94.33 % was gained by using SVM classifier with the multi-feature set combining the feature SRC, Williston amplitude (WAMP), wavelength (WL) and the coefficients of the fourth order autoregressive model (ARC4) via multiple kernel learning framework. The proposed feature extraction scheme (known as SRC + WAMP + WL + ARC4) is a promising method for multi-movement recognition with high accuracy.

Keywords

Surface electromyography (sEMG) Feature extraction Non-stationarity Sparse representation Temporal MMV sparse Bayesian learning (T-MSBL) 

Notes

Acknowledgments

We thank S. L. Fang, C. Y. Zhang, C. C. Yu, Y. C. Liu, S. X. Cheng and T. Z. Xia for discussions and assistance with this work.

Compliance with ethical standards

Conflict of interest

No conflict of interest.

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Copyright information

© Australasian College of Physical Scientists and Engineers in Medicine 2015

Authors and Affiliations

  1. 1.School of Automation Science and Electrical EngineeringBeihang UniversityBeijingChina

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