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Spatio-spectral filters for low-density surface electromyographic signal classification

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Abstract

In this paper, we proposed to utilize a novel spatio-spectral filter, common spatio-spectral pattern (CSSP), to improve the classification accuracy in identifying intended motions based on low-density surface electromyography (EMG). Five able-bodied subjects and a transradial amputee participated in an experiment of eight-task wrist and hand motion recognition. Low-density (six channels) surface EMG signals were collected on forearms. Since surface EMG signals are contaminated by large amount of noises from various sources, the performance of the conventional time-domain feature extraction method is limited. The CSSP method is a classification-oriented optimal spatio-spectral filter, which is capable of separating discriminative information from noise and, thus, leads to better classification accuracy. The substantially improved classification accuracy of the CSSP method over the time-domain and other methods is observed in all five able-bodied subjects and verified via the cross-validation. The CSSP method can also achieve better classification accuracy in the amputee, which shows its potential use for functional prosthetic control.

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Acknowledgments

This work is supported by the National Basic Research Program (973 Program) of China (Grant No. 2011CB013305), the Science and Technology Commission of Shanghai Municipality (Grant No. 11JC1406000) and the State Key Laboratory of Mechanical System and Vibration (Grant No. MSVZD201204). Zhiguo Zhang is partially supported by the University of Hong Kong Seed Funding Programme for Basic Research (Grant No. 201203159009).

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Authors and Affiliations

  1. State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University, Shanghai, 200240, China

    Gan Huang, Dingguo Zhang & Xiangyang Zhu

  2. Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China

    Zhiguo Zhang

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  1. Gan Huang
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  2. Zhiguo Zhang
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  3. Dingguo Zhang
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  4. Xiangyang Zhu
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Correspondence to Gan Huang.

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Huang, G., Zhang, Z., Zhang, D. et al. Spatio-spectral filters for low-density surface electromyographic signal classification. Med Biol Eng Comput 51, 547–555 (2013). https://doi.org/10.1007/s11517-012-1024-3

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  • DOI: https://doi.org/10.1007/s11517-012-1024-3

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