Inattentive Driving Detection Using Body-Worn Sensors: Feasibility Study
Abstract
:1. Introduction
2. Overview of the Proposed System
2.1. Detection Algorithm
- Body Movement Detection: Based on the anomaly detection approach, this model detects wrist movements during monotonous steering operation as a non-anomaly (i.e., “no body movement’’) and other large body movements such as changing the hand position or releasing the steering wheel as an anomaly. Features of wrist movements such as the mean and variance of acceleration, which are widely used in Human Activity Recognition (HAR) [29,30,31], are computed from accelerometer data and used as input to the model. If “no body movement” is determined, the next model determines the state.
- Drowsiness Detection: Based on the anomaly detection approach, this model detects a state with an ordinary arousal level as a non-anomaly (i.e., “no drowsiness”), and a decrease in arousal from the normal state is considered an anomaly. Features of heart rate variability (HRV), widely used as an indicator of autonomic nervous system activity, are computed from RR interval (RRI) data and used as input to the model. The RR interval is the time interval of the R wave, which is the positive peak included in the ECG waveform, as shown in Figure 1. If “no drowsiness” is determined, the next model determines the state.
- Inattention Detection: Based on the anomaly detection approach, this model detects wrist movements during monotonous steering operation as a non-anomaly (i.e., “no inattention”), and wrist movements during monotonous steering operation in a state of reduced vigilance are considered an anomaly. Motion features described in the below section are computed from accelerometer data to obtain the fine-grained changes of the wrist movement and used as input in the model. If “no inattention” is determined, the state is defined as “normal state”.
2.2. Feature Extraction
2.2.1. Heart Rate Variability Features
2.2.2. Motion Features
- Consider a subsequence extracted by the sliding window [34] of length W [s] from the acceleration signal of th-axis.
- The subsequence is divided into sub-windows and calculated by taking the difference in average amplitude between the adjacent sub-window:
- Calculate a histogram for the , and its statistics are used as the motion features. In this study, we use three statistics: variance, skewness, and kurtosis to describe the distribution shape. Note that the three motion features, variance/skewness/kurtosis of the difference values within the subsequence, were defined experimentally, which provided the best overall estimation.
2.3. Multivariate Statistical Process Control Model
3. Experiment
3.1. Participants
3.2. Experimental Design and Procedures
3.3. Annotation of Driver State
3.4. Data Acquisition
4. Results and Discussions
4.1. Drowsiness Detection Model
4.2. Inattentive Detection Model
4.3. Detection Results
4.4. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Drowsiness | Inattention | |||
---|---|---|---|---|
Subj. | Sensitivity | Specificity | Sensitivity | Specificity |
1 | 0.59 | 0.33 | 0.94 | 0.47 |
2 | 0.06 | 0.86 | 0.73 | 0.75 |
3 | - | - | 0.12 | 0.99 |
4 | 1.00 | 0.26 | 0.87 | 0.17 |
5 | 0.41 | 0.91 | 0.91 | 0.49 |
Avg. | 0.52 | 0.59 | 0.71 | 0.58 |
Study | Category | Measuring Method | Participant# (Male:Female, Age) | Scenario | Platform | Ground Truth |
---|---|---|---|---|---|---|
Abe et al. (2016) [15] | Drowsiness | Wearable RRI telemetry | 27 (17:10, 20 s to 40 s) | Driving on a highway loop line at night for two hours | DS | Facial expression rating by human referees |
Lee et al. (2019) [40] | Drowsiness | Wristwatch-type PPG and Chest-belt-type ECG sensor | 6 (n/a, 20 to 35) | n/a | DS | Visual evaluation of facial and body movement |
Iwamoto et al. (2021) [17] | Drowsiness | ECG with chest electrode | 25 (17:8, mean ) | A monotonous driving task in a dark room for three hours | DS | Labeled based on sleep specialist’s score |
Lee et al. (2015) [23] | Drowsiness | Wristwatch-type PPG and Wrist-worn IMU sensors | 12 (9:3, 21 to 45) | Highway driving simulation | DS | Karolinska sleepiness scale (KSS) every 2 min |
Jiang et al. (2018) [24] | Manual distraction | Wrist-worn IMU sensor (on the right wrist) | 20 (10:10, 25 to 35) | Participants perform five different hand gestures, such as smartphone use | Real | Manually labeled |
Tanaka et al. (2020) [25] | Cognitive distraction | Wrist-worn IMU sensors | 7 (7:0, mean ) | A monotonous driving task with a cognitive task called N-back task | DS | The task level, that is, N in the N-back task |
Sun et al. (2021) [26] | Manual distraction | Wrist-worn IMU sensor (on the right wrist) | 20 (14:6, 21 to 35) | Participants perform four types of gestures; three manual distractions and one regular driving motion | Real | Manually labeling by a passenger |
Kume et al. (2014) [3] | Drowsiness and absentminded state | Steering wheel angles and vehicle speed | 34 (16:18, 20 s to 60 s) | Driving for 1.5 h on the specified highway section | Real | Subjective evaluation on a 5-point scale per 3 min |
This study | Drowsiness and absentminded state | Wrist-worn IMU sensors and ECG with chest electrode | 5 (2:3, 20 to 45) | A monotonous driving task for approximately an hour | DS | Facial expression rating and reaction time (see Section 3.3) |
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Akiduki, T.; Nagasawa, J.; Zhang, Z.; Omae, Y.; Arakawa, T.; Takahashi, H. Inattentive Driving Detection Using Body-Worn Sensors: Feasibility Study. Sensors 2022, 22, 352. https://doi.org/10.3390/s22010352
Akiduki T, Nagasawa J, Zhang Z, Omae Y, Arakawa T, Takahashi H. Inattentive Driving Detection Using Body-Worn Sensors: Feasibility Study. Sensors. 2022; 22(1):352. https://doi.org/10.3390/s22010352
Chicago/Turabian StyleAkiduki, Takuma, Jun Nagasawa, Zhong Zhang, Yuto Omae, Toshiya Arakawa, and Hirotaka Takahashi. 2022. "Inattentive Driving Detection Using Body-Worn Sensors: Feasibility Study" Sensors 22, no. 1: 352. https://doi.org/10.3390/s22010352
APA StyleAkiduki, T., Nagasawa, J., Zhang, Z., Omae, Y., Arakawa, T., & Takahashi, H. (2022). Inattentive Driving Detection Using Body-Worn Sensors: Feasibility Study. Sensors, 22(1), 352. https://doi.org/10.3390/s22010352