Toward Robust and Accurate Myoelectric Controller Design Based on Multiobjective Optimization Using Evolutionary Computation

Myoelectric pattern recognition holds significant importance in designing control strategies for a range of applications, including upper limb prostheses and biorobotic hand movement systems. It serves as a crucial aspect in formulating effective control strategies for these applications. This study...

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Published in:	IEEE sensors journal Vol. 24; no. 5; pp. 6418 - 6429
Main Authors:	Shaikh, Ahmed Aqeel, Mukhopadhyay, Anand Kumar, Poddar, Soumyajit, Samui, Suman
Format:	Journal Article
Language:	English
Published:	New York IEEE 01.03.2024 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Accuracy Classification Classifiers Control systems design Controllers Design optimization Electromyogram (EMG) Electromyography Evolutionary algorithms Evolutionary computation evolutionary computation (EC) Genetic algorithms Machine learning machine learning (ML) multiobjective optimization Multiple objective analysis myoelectric control Myoelectricity Optimization Pattern recognition Prostheses Robust control Sensors Sorting algorithms Supervised learning Support vector machines surface electromyography (sEMG) signal classification System effectiveness Training
ISSN:	1530-437X, 1558-1748
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Abstract	Myoelectric pattern recognition holds significant importance in designing control strategies for a range of applications, including upper limb prostheses and biorobotic hand movement systems. It serves as a crucial aspect in formulating effective control strategies for these applications. This study presents a novel method for creating a robust and accurate electromyogram (EMG)-based controller. The approach involves leveraging a kernelized support vector machine (SVM) classifier to interpret surface electromyography (sEMG) signals and accurately deduce muscle movements. The primary objective in designing the classifier is to minimize false movements specifically during the "rest" position of the controller, thereby optimizing the overall performance of the EMG-based controller (EBC). To achieve this, the training algorithm of the supervised learning system is formulated as a problem of constrained multiobjective optimization. For tuning the hyperparameters of SVM, we employ the nondominated sorting genetic algorithm II (NSGA-II), which is an elitist multiobjective evolutionary algorithm (MOEA). Experimental results are presented using a dataset comprising sEMG signals obtained from 11 subjects at five different positions of the upper limb. Furthermore, the performance of the trained models based on the two-objective metrics, namely classification accuracy and false-negative have been evaluated on two different test sets to examine the generalization capability of the proposed training approach while implementing limb-position invariant EMG classification. The results presented clearly demonstrate that the proposed approach offers increased flexibility to the designer in selecting classifier parameters, enabling them to optimize the robustness and accuracy of the EBC more effectively.
AbstractList	Myoelectric pattern recognition holds significant importance in designing control strategies for a range of applications, including upper limb prostheses and biorobotic hand movement systems. It serves as a crucial aspect in formulating effective control strategies for these applications. This study presents a novel method for creating a robust and accurate electromyogram (EMG)-based controller. The approach involves leveraging a kernelized support vector machine (SVM) classifier to interpret surface electromyography (sEMG) signals and accurately deduce muscle movements. The primary objective in designing the classifier is to minimize false movements specifically during the "rest" position of the controller, thereby optimizing the overall performance of the EMG-based controller (EBC). To achieve this, the training algorithm of the supervised learning system is formulated as a problem of constrained multiobjective optimization. For tuning the hyperparameters of SVM, we employ the nondominated sorting genetic algorithm II (NSGA-II), which is an elitist multiobjective evolutionary algorithm (MOEA). Experimental results are presented using a dataset comprising sEMG signals obtained from 11 subjects at five different positions of the upper limb. Furthermore, the performance of the trained models based on the two-objective metrics, namely classification accuracy and false-negative have been evaluated on two different test sets to examine the generalization capability of the proposed training approach while implementing limb-position invariant EMG classification. The results presented clearly demonstrate that the proposed approach offers increased flexibility to the designer in selecting classifier parameters, enabling them to optimize the robustness and accuracy of the EBC more effectively.
Author	Poddar, Soumyajit Shaikh, Ahmed Aqeel Samui, Suman Mukhopadhyay, Anand Kumar
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SubjectTerms	Accuracy Classification Classifiers Control systems design Controllers Design optimization Electromyogram (EMG) Electromyography Evolutionary algorithms Evolutionary computation evolutionary computation (EC) Genetic algorithms Machine learning machine learning (ML) multiobjective optimization Multiple objective analysis myoelectric control Myoelectricity Optimization Pattern recognition Prostheses Robust control Sensors Sorting algorithms Supervised learning Support vector machines surface electromyography (sEMG) signal classification System effectiveness Training
Title	Toward Robust and Accurate Myoelectric Controller Design Based on Multiobjective Optimization Using Evolutionary Computation
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