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Estimation of continuous thumb angle and force using electromyogram classification

Siddiqi, Abdul Rahman and Sidek, Shahrul Na'im (2016) Estimation of continuous thumb angle and force using electromyogram classification. International Journal of Advanced Robotic Systems, 13 (5). ISSN 17298814 E-ISSN 17298814

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Human hand functions range from precise minute handling to heavy and robust movements. Remarkably, 50% of all hand functions are made possible by the thumb. Therefore, developing an artificial thumb that can mimic the actions of a real thumb precisely is a major achievement. Despite many efforts dedicated to this area of research, control of artificialthumb movements in resemblance to our natural movement still poses as a challenge. Most of the development in thisarea is based on discontinuous thumb position control, which makes it possible to recreate several of the most important functions of the thumb but does not result in total imitation. This work looks into the classification of electromyogram signals from thumb muscles for the prediction of thumb angle and force during flexion motion. For this purpose, an experimental setup is developed to measure the thumb angle and force throughout the range of flexion and simultaneously gather the electromyogram signals. Further, various features are extracted from these signals for classification and the most suitable feature set is determined and applied to different classifiers. A ‘‘piecewise discretization’’ approach is used for continuous angle prediction. Breaking away from previous research studies, the frequency-domain features performed better than the time-domain features, with the best feature combination turning out to be median frequency–mean frequency–mean power. As for the classifiers, the support vector machine proved to be the most accurate classifier giving about 70% accuracy for both angle and force classification and close to 50% for joint angle–force classification.

Item Type: Article (Journal)
Uncontrolled Keywords: Electromyogram, biosignal processing, classification, features extraction, motion prediction.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA164 Bioengineering
T Technology > TJ Mechanical engineering and machinery
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechatronics Engineering
Depositing User: Dr. Shahrul Naim Sidek
Date Deposited: 21 Dec 2016 12:37
Last Modified: 13 Apr 2017 15:37
URI: http://irep.iium.edu.my/id/eprint/53827

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