Title :
A real-time EMG pattern recognition based on linear-nonlinear feature projection for multifunction myoelectric hand
Author :
Chu, Jun-Uk ; Moon, Inhyuk ; Mun, Mu-seong
Author_Institution :
Korea Orthopedics & Rehabilitation Eng. Center, Incheon, South Korea
fDate :
28 June-1 July 2005
Abstract :
This paper proposes a novel real-time EMG pattern recognition for the control of multifunction myoelectric hand from four channel EMG signals. To cope with the nonstationary signal property of the EMG, features are extracted by wavelet packet transform. For dimensionality reduction and nonlinear mapping of the features, we also propose a linear-nonlinear feature projection composed of PCA and SOFM. The dimensionality reduction by PCA simplifies the structure of the classifier, and reduces processing time for the pattern recognition. The nonlinear mapping by SOFM transforms the PCA-reduced features to a new feature space with high class separability. Finally a multilayer neural network is employed as the pattern classifier. We implement a real-time control system for a multifunction virtual hand. From experimental results, we show that all processes, including virtual hand control, are completed within 125 msec, and the proposed method is applicable to real-time myoelectric hand control without an operation time delay.
Keywords :
electromyography; feature extraction; medical control systems; medical signal processing; neural nets; principal component analysis; wavelet transforms; PCA; SOFM; feature extraction; linear-nonlinear feature projection; multifunction myoelectric hand control; multilayer neural network; nonstationary signal property; real-time EMG pattern recognition; wavelet packet transform; Control systems; Electromyography; Feature extraction; Multi-layer neural network; Neural networks; Pattern recognition; Principal component analysis; Real time systems; Wavelet packets; Wavelet transforms;
Conference_Titel :
Rehabilitation Robotics, 2005. ICORR 2005. 9th International Conference on
Print_ISBN :
0-7803-9003-2
DOI :
10.1109/ICORR.2005.1501105