Open Access

ARTICLE

User Recognition System Based on Spectrogram Image Conversion Using EMG Signals

Jae Myung Kim^1,2, Gyu Ho Choi², Min-Gu Kim², Sung Bum Pan^1,2,*

1 Interdisciplinary Program in IT-Bio Convergence System, Chosun University, Gwangju, 61452, Korea
2 IT Research Institute, Chosun University, Gwangju, 61452, Korea

* Corresponding Author: Sung Bum Pan. Email:

(This article belongs to the Special Issue: Security and Privacy Issues in Systems and Networks Beyond 5G)

Computers, Materials & Continua 2022, 72(1), 1213-1227. https://doi.org/10.32604/cmc.2022.025213

Received 16 November 2021; Accepted 28 December 2021; Issue published 24 February 2022

Abstract

Recently, user recognition methods to authenticate personal identity has attracted significant attention especially with increased availability of various internet of things (IoT) services through fifth-generation technology (5G) based mobile devices. The EMG signals generated inside the body with unique individual characteristics are being studied as a part of next-generation user recognition methods. However, there is a limitation when applying EMG signals to user recognition systems as the same operation needs to be repeated while maintaining a constant strength of muscle over time. Hence, it is necessary to conduct research on multidimensional feature transformation that includes changes in frequency features over time. In this paper, we propose a user recognition system that applies EMG signals to the short-time fourier transform (STFT), and converts the signals into EMG spectrogram images while adjusting the time-frequency resolution to extract multidimensional features. The proposed system is composed of a data pre-processing and normalization process, spectrogram image conversion process, and final classification process. The experimental results revealed that the proposed EMG spectrogram image-based user recognition system has a 95.4% accuracy performance, which is 13% higher than the EMG signal-based system. Such a user recognition accuracy improvement was achieved by using multidimensional features, in the time-frequency domain.

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Keywords

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