Nonlinear multiscale Maximal Lyapunov Exponent for accurate myoelectric signal classification

Yina Guo, Ganesh R. Naik, Shuhua Huang, Ajith Abraham, Hung T. Nguyen

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


Surface Electromyography (sEMG) is a non-invasive, easy to record signal of superficial muscles from the skin surface. The sEMG is widely used in evaluating the functional status of the hand to assist in hand gesture recognition, prosthetics and rehabilitation applications. Considering the nonlinear and non-stationary characteristics of sEMG, hand gesture recognition using sEMG signals necessitate designers to use Maximal Lyapunov Exponent (MLE) or ensemble Empirical Mode Decomposition (EMD) based MLEs. In this research, we propose a hand gesture recognition method of sEMG based on nonlinear multiscale MLE. The aim is to increase the classification accuracy of sEMG features while reducing the complexity of EMD. The nonlinear MLE features are classified using Flexible Neural Tree (FNT), which can solve highly structured dependent problems of the Artificial Neural Network (ANN). The testing has been conducted using several experiments with five participants. The classification performance of nonlinear multiscale MLE method is compared with MLE and EMD-based MLE through simulations. Experimental results demonstrate that the former algorithm outperforms the two latter algorithms and can classify six different hand gestures up to 97.6% accuracy.

Original languageEnglish
Pages (from-to)633-640
Number of pages8
JournalApplied Soft Computing Journal
Publication statusPublished - Nov 2015
Externally publishedYes


  • Empirical Mode Decomposition (EMD)
  • Flexible Neural Trees (FNT)
  • Hand gesture recognition
  • Maximal Lyapunov Exponent (MLE)
  • Principal Component Analysis (PCA)
  • Surface Electromyography (sEMG)


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