Identification and Verification Datasets Based on Surface Electromyography
8-channel monopolar sEMG signals were acquired using the device developed by our research group at a sampling rate of 1000 Hz. Medical gel electrodes (CH50B, Shanghai Hanjie Electronic Technology Co., LTD., Shanghai, China) were used for data collection. The position of the electrodes is shown in Fig. 2. The REF electrode was placed on the inner side of the upper big arm near the elbow and the RLD electrode was placed on the outer side of the right upper arm near the elbow. Eight monopolar electrodes were placed on the right forearm. Two rings divide the length of the forearm (from wrist to elbow) evenly into three equal sections. Channels 1-4 were placed evenly on the first ring and the channels 5-8 were placed on the second ring.
During the experiment, the subjects stood still with their arms hanging down naturally. The subjects were asked to perform 3 gestures using only their right hand, with the forearm and upper arm remaining as still as possible. The 3 gestures as presented in Fig. 3 are the following: (1) static gesture: wrist flexion with the hand closed, (2) static gesture: index finger, middle finger, and little finger extension, and (3) dynamic gesture: wrist counterclockwise rotation with the hand closed - hand open - hand close (see Supplementary Video 1 demonstrating the 3 designed gestures). Before each trial, subjects had enough time to learn how to perform each gesture. During each trial, the instruction video was played to guide the subjects to perform gestures in accordance with the sequence. Each trial was compromised of a 10-second pre-trial resting period for getting ready, followed by 20 execution-rest pairs, and ended with a 5-second post-trial resting period., as shown in Fig. 4. Each execution-rest pair consisted of a 3-second gesture performance and a 3-second rest. Three trials of three gestures were performed separately. Between each trial, enough time was offered to rest. Wrong execution and malformed signals were removed from the database, and the collection was repeated until the database contained 20 complete sets of signals for each gesture of each subject. Two sessions with the same experimental procedure were acquired on different days. Data from 17 subjects were included in Session 1, and data from subjects 1 to 8 were included in Session 2 on another day (interval 2-77 days, 47.25±37.50 days on average). In Session 2, electrodes were replaced, thus the effect of minor electrode shift and minor gesture variation on personal identification and verification performance were considered in this study.