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Comparative Study
. 2024 Jun 4;24(11):3638.
doi: 10.3390/s24113638.

Comparative Study of sEMG Feature Evaluation Methods Based on the Hand Gesture Classification Performance

Affiliations
Comparative Study

Comparative Study of sEMG Feature Evaluation Methods Based on the Hand Gesture Classification Performance

Hiba Hellara et al. Sensors (Basel). .

Abstract

Effective feature extraction and selection are crucial for the accurate classification and prediction of hand gestures based on electromyographic signals. In this paper, we systematically compare six filter and wrapper feature evaluation methods and investigate their respective impacts on the accuracy of gesture recognition. The investigation is based on several benchmark datasets and one real hand gesture dataset, including 15 hand force exercises collected from 14 healthy subjects using eight commercial sEMG sensors. A total of 37 time- and frequency-domain features were extracted from each sEMG channel. The benchmark dataset revealed that the minimum Redundancy Maximum Relevance (mRMR) feature evaluation method had the poorest performance, resulting in a decrease in classification accuracy. However, the RFE method demonstrated the potential to enhance classification accuracy across most of the datasets. It selected a feature subset comprising 65 features, which led to an accuracy of 97.14%. The Mutual Information (MI) method selected 200 features to reach an accuracy of 97.38%. The Feature Importance (FI) method reached a higher accuracy of 97.62% but selected 140 features. Further investigations have shown that selecting 65 and 75 features with the RFE methods led to an identical accuracy of 97.14%. A thorough examination of the selected features revealed the potential for three additional features from three specific sensors to enhance the classification accuracy to 97.38%. These results highlight the significance of employing an appropriate feature selection method to significantly reduce the number of necessary features while maintaining classification accuracy. They also underscore the necessity for further analysis and refinement to achieve optimal solutions.

Keywords: feature evaluation; feature extraction; feature selection; gesture recognition; myography; surface electromyography.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Flowchart of classification performance evaluation with and without feature evaluation methods.
Figure 2
Figure 2
Hand force exercise gestures.
Figure 3
Figure 3
sEMG sensor positions in the forearm muscles.
Figure 4
Figure 4
Raw signals recorded using sEMG sensors during hand force exercises for 4 s measurement.
Figure 4
Figure 4
Raw signals recorded using sEMG sensors during hand force exercises for 4 s measurement.
Figure 5
Figure 5
Classification accuracy improvement for the benchmark dataset after feature selection.
Figure 6
Figure 6
Comparison of validation accuracy of feature selection methods on sEMG dataset.
Figure 7
Figure 7
Radar plot of the top selected features with RFE method.
Figure 8
Figure 8
Confusion matrix with 65 selected features by RFE.
Figure 9
Figure 9
Confusion matrix with 75 selected features by RFE.
Figure 10
Figure 10
Confusion matrix with 68 selected features by RFE.

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