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Albadawi, Y. Driver Drowsiness Detection Systems. Encyclopedia. Available online: https://encyclopedia.pub/entry/20784 (accessed on 25 April 2024).
Albadawi Y. Driver Drowsiness Detection Systems. Encyclopedia. Available at: https://encyclopedia.pub/entry/20784. Accessed April 25, 2024.
Albadawi, Yaman. "Driver Drowsiness Detection Systems" Encyclopedia, https://encyclopedia.pub/entry/20784 (accessed April 25, 2024).
Albadawi, Y. (2022, March 21). Driver Drowsiness Detection Systems. In Encyclopedia. https://encyclopedia.pub/entry/20784
Albadawi, Yaman. "Driver Drowsiness Detection Systems." Encyclopedia. Web. 21 March, 2022.
Driver Drowsiness Detection Systems
Edit

Continuous advancements in computing technology and artificial intelligence have led to improvements in driver monitoring systems. Numerous experimental studies have collected real driver drowsiness data and applied various artificial intelligence algorithms and feature combinations with the goal of significantly enhancing the performance of these systems in real-time. 

biological-based measures driver drowsiness detection hybrid-based measures image-based measures vehicle-based measures

1. Introduction

Based on 2017 police and hospital reports, the National Highway Traffic Safety Administration (NHTSA) identified 91,000 car accidents as being caused by drowsy drivers. These accidents resulted in 50,000 injuries. In 2019, 697 fatalities involved a drowsy driver. However, NHTSA admits that it is hard to determine the precise number of drowsy-driving accidents, injuries, or deaths and that the reported numbers are underestimates [1]. For example, a study by the American Automobile Association’s foundation for traffic safety estimated that more than 320,000 drowsy driving accidents happen each year, including 6400 fatal crashes [2]. The high numbers indicate that drowsy driving is a serious concern that needs to be addressed to mitigate its impact.
Drowsiness refers to sleepiness, often in inappropriate situations [3]. Although the state of drowsiness may only last for a few minutes, its consequences can be disastrous. The reason for entering such a state is usually attributed to fatigue, which diminishes attention and alertness levels [4]. Drowsiness may happen either by driving for long distances without enough sleep or driving at a time when the driver would typically be asleep [5]. In such cases, the main problem is the drowsy driver’s lack of concentration, resulting in a delayed response to any event on the road [6].
Fortunately, it is possible to detect driver drowsiness in its early stages and alarm the driver to avoid any potential accident. Drowsy drivers exhibit various signs, which include repeated yawning, frequent eye closure, and repeatedly departing street lanes [6]. In fact, driver drowsiness detection (DDD) techniques have been researched intensively in recent years [7][8][9][10][11][12][13]. Researchers have proposed various measures to detect these drowsiness signs as early as possible, in order to avoid accidents. These measures can be divided into four main categories: firstly, image-based measures that are obtained using a camera to analyze the driver’s movements and facial expressions; secondly, biological-based measures that relate to the driver’s bio-signals and can be recorded by placing special sensors on the driver’s body; thirdly, vehicle-based measures, which depend on monitoring the behavior and movement of the vehicle; finally, hybrid-based measures, using two or more measures. According to the literature, in 2019, Ramzan et al. [9] presented a comprehensive analysis for the existing DDD methods, as well as a detailed analysis for the commonly used classification techniques in this sector. Ramzan et al. classified the DDD techniques into three categories: behavioral, physiological, and vehicular parameter-based techniques. Then, they reviewed the top supervised learning techniques used in detecting drowsiness. In the end, they discussed the pros and cons of the three DDD in a comparative study. On the other hand, Sikander and Anwar [10] presented an in-depth review of the recent advancements in the field of driver fatigue detection. Here, the DDD methods were categorized into five groups, depending on the extracted fatigue features, including physical features, vehicular features, biological features, subjective reporting, and hybrid features. Furthermore, the fatigue effect on driving performance was discussed, along with the existing commercial products for fatigue detection available on the market. Additionally, Dong et al. presented a review of driver inattention monitoring technologies. Inattention consists of distraction and fatigue [11]. Dong et al. summarized the detection measure into five groups, similar to Sikander and Anwar’s work [10]. In their review, Dong et al. introduced the concept of driver inattention and its effect on driving performance. Additionally, they covered some of the commercial products related to inattention detection, along with a detailed review of previous research on inattention detection.

2. Drowsiness Detection Measures

In order to detect the different stages of drowsiness, researchers have studied driver responses and vehicle driving patterns. This section provides an overview of the four widely used measures for DDD. The diagram in Figure 1 illustrates all the currently used measures for classifying driver drowsiness levels. Two of these measures are observed in the drivers themselves: image- and biological-based. The third measure is extracted from the car itself and referred to as the vehicle-based measure. The fourth measure considered is the hybrid measure, which combines at least two of the previously mentioned ones.
Sensors 22 02069 g001
Figure 1. Driver drowsiness detection measures.
Figure 2 illustrates a DDD system’s general block diagram and data flow that can employ any of the four measures mentioned above. Initially, data are captured using a suitable sensing device; then, the target features are extracted from the captured signals. This step is essential because it simplifies the system input by discarding irrelevant information and extracting useful ones. Next, some systems may employ feature transformation or dimensionality reduction, in order to project the data in another domain, where it is easier to analyze or reduce the computational load. The fourth step selects the features that best correlate to drowsiness, using different feature selection algorithms, such as backward selection or wrapper feature selection methods. After that, machine learning (ML) or deep learning is utilized to generate a model in the training phase that is used to classify the driver’s status. The trained model is used in the testing phase to detect the driver’s drowsiness level and, if required, take action, such as activating an alarm or alerting the driver to take a break.
Sensors 22 02069 g002
Figure 2. Driver drowsiness detection systems data flow.
Various metrics have been used to evaluate the ability of the system to detect drowsy subjects. These include accuracy, precision, and sensitivity. The equations for three metrics are listed below (1)–(3) [14][15].
(1)
(2)
(3)

2.1. Image-Based Measures

Some drowsiness signs are visible and can be recorded by cameras or visual sensors. They include the driver’s facial expressions and movements, especially the head movements. The literature refers to these signs as visual [8] or image-based measures [7]. Herein refers to them as image-based measures to highlight that these measures usually lead to features extracted from images or videos. Additionally, it is important to note here that image-based measures are a subcategory of the physical [10] or behavioral measures [9]. Physical and behavioral measures refer to the body movements captured either from videos or using motion sensors, such as a gyroscope and accelerometer [16][17].
Image-based DDD systems can be broadly categorized into three techniques, based on whether movements of the mouth, head, or eyes are observed. Table 1 lists some of the image-based measures.
Table 1. Some of the image-based measures.
Features Description
Blink frequency [18] The number of times an eye closes over a specific period of time.
Maximum closure duration of the eyes [18] The maximum time the eye was closed. However, it can be risky to delay detecting an extended eye closure that indicates a drowsy driver.
Percentage of eyelid closure (PERCLOS) [19] The percentage of time (per minute) in which the eye is 80% closed or more.
Eye aspect ratio (EAR) [20] EAR reflects the eye’s openness degree. The EAR value drops down to zero when the eyes are closed. On the other hand, it remains approximately constant when the eye is open. Thus, the EAR detects the eye closure at that time.
Yawning frequency [21] The number of times the mouth opens over a specific period of time.
Head pose [22] Is a figure that describes the driver’s head movements. It is determined by counting the video segments that show a large deviation of three Euler angles of head poses from their regular positions. These three angles are nodding, shaking, and tilting.

2.2. Biological-Based Measures

Many biological signals have been used to detect the driver’s drowsiness, such as brain activity, heart rate, breathing rate, pulse rate, and body temperature signals [10]. These biological signals, also known as physiological measures [9], are proven to be more accurate and reliable for detecting drowsiness. This accuracy is due to their ability to capture early biological changes that may appear, in the case of drowsiness, thus alerting the driver before any physical drowsiness signs appear. The most commonly used biological measures in literature are listed in Table 2.
Table 2. Some biological-based measures.
Biological Signals Description
Electroencephalography (EEG) [23] An EEG signal is a monitoring method that records the brain’s electrical activity from the scalp. It represents the microscopic activity of the brain’s surface layer underneath the scalp. Based on the frequency ranges (0.1 Hz–100 Hz), these signals are categorized as delta, theta, alpha, beta, and gamma.
Electrocardiography (ECG) [24] ECG signals represent the electrical activity of the heart, which are acquired using electrodes placed on the skin. ECG monitors heart functionality, including heart rhythm and rate.
Heart rate variability (HRV) [26] HRV signals are used to monitor the changes in the cardiac cycle, including the heartbeats.
Electrooculography (EOG) [27] EOG signals are used to measure the corneo-retinal standing potential between the front and back of the human eye and record the eye movements.
Electromyography (EMG) [28] EMG signals are the collective electric signals produced from muscles movement.

2.3. Vehicle-Based Measures

This method depends on tracing and analyzing driving patterns. Every driver forms a unique driving pattern. Thus, the driving patterns of a drowsy driver can be easily distinguished from those of an alert driver. According to Pratama et al. [8], vehicular-based measures are the least investigated methods, due to the difficulty of precisely determining drowsy driving state features. Thus, many researchers combine this measure with image-based or biological measures [29][30][31]. The two most common detected vehicle-based measures, used to identify driver drowsiness, are steering wheel angle (SWA) and lane departure. Table 3 provides a list of DDD systems based on vehicle measures.
Table 3. Vehicle-based drowsiness detection systems.
Ref. Vehicle
Parameters
Extracted Features Classification Method Description Quality Metric Dataset
[30] Steering wheel SWA RF Used SWA as input data and compared it with PERCLOS. The RF algorithm was trained by a series of decision trees, with a randomly selected feature. Accuracy: RF- steering model:
79%
PERCLOS: 55%
Prepared their own dataset
[31] Lateral distance Statistical features, derived from the time and wavelet domains, relevant to the lateral distance and lane trajectory SVM and neural network Detection was based on lateral distance. Additionally, it collects data of the driver’s facial and head movements to be used as ground truth for the vehicle data. Accuracy:
Over 90%
Prepared their own dataset
[32] Steering wheel SWA Specially designed binary decision classifier Used SWA data to apply online fatigue detection. The alertness state is determined using a specially designed classifier. Accuracy: Drowsy: 84.85%
Awake: 78.01%
Prepared their own dataset
[33] Steering wheel SWA, steering wheel velocity ANFIS for feature selection, PSO for optimizing the ANFIS parameters, and
SVM for classification
Detection was based on steering wheel data. The system used a selection method that utilized ANFIS. Accuracy: 98.12% Prepared their own dataset
[34] Steering wheel SW_Range_2, Amp_D2_Theta, PNS, and NMRHOLD MOL, SVM, and BPNN Used steering wheel status data. Using variance analysis, four parameters were selected, based on the correlation level with the driver’s status. MOL model performed best. Accuracy:
MOL: 72.92%
SVM: 63.86%
BPNN: 62.10%
Prepared their own dataset

2.4. Hybrid-Based Measures

A hybrid DDD system employs a combination of image-, biological-, and vehicle-based measures to extract drowsiness features, with the aim of producing a more robust, accurate, and reliable DDD system. Table 4 shows a list of some of the recently proposed hybrid DDD systems.
Table 4. Hybrid-based drowsiness detection systems.
Ref. Sensors Hybrid
Parameters
Extracted Features Classification Method Description Quality Metric Dataset
[29] Automatic gearbox, image-generating computers, and control-loaded steering system Image- and vehicle-based features Latera position, yaw angle, speed, steering angle, driver’s input torque, eyelid opening degree, etc. A series of mathematical operations, specified schemes from the study hypothesis A system that assists the driver in case drowsiness is detected to prevent lane departure. It gives the driver a specific duration of time to control the car. If not, the system controls the vehicle and parks it. Accuracies up to 100% in taking control of the car when the specified driving conditions were met Prepared their own dataset
[16] PPG, sensor, accelerometer, and gyroscope Biological- and vehicle-based features Heart rate, stress level, respiratory rate, adjustment counter, and pulse rate variability, steering wheel’s linear acceleration, and radian speed SVM It collected data from the sensors. Then, the features were extracted and fed to the SVM algorithm. If determined drowsy, the driver is alerted via the watch’s alarm. Accuracy: 98.3% Prepared their own dataset
[35] Smartphone camera Biological- and image-based features Blood volume pulse, blinking duration and frequency, HRV, and yawning frequency If any of the detected parameters showed a specific change/value Used a multichannel second-order blind identification based on the extended-PPG in a smartphone to extract blood volume pulse, yawning, and blinking signals. Sensitivity: Up to 94% Prepared their own dataset
[17] Headband, equipped with EEG electrodes, accelerometer, and
gyroscope
Biological- and behavioral-based features Eyeblink patterns analysis, head movement angle, and magnitude, and spectral power analysis Backward feature selection method applied followed by various classifiers Used a non-invasive and wearable headband that contains three sensors. This system combines the features extracted from the head movement analysis, eye blinking, and spectral signals. The features are then fed to a feature selection block followed by various classification methods. Linear SVM performed the best. Accuracy, sensitivity, and precision:
Linear SVM: 86.5%, 88%, and 84.6%
Linear SVM after feature selection: 92%, 88%, and 95.6%
Prepared their own dataset
[36] SCANeR Studio, faceLAB, electrocardiogram, PPG sensor,
electro-dermal activity, Biopac MP150 system, and AcqKnowledge software
Biological-, image-, and vehicle-based features Heart rate and variability, respiration rate, blink duration, frequency,
PERCLOS, head and eyelid movements, time-to-lane-crossing, position on the lane, speed, and SWA
ANN Included two models that used ANN. One is for detecting the drowsiness degree, and the other is for predicting the time needed to reach a specific drowsiness level. Different combinations of the features were tested. Overall mean square error of 0.22 for predicting various drowsiness levels
Overall mean square error of 4.18 min for predicting when a specific drowsiness level will be reached
Prepared their own dataset
[37] EEG, EOG, ECG
electrodes, and channels
Biological-based features and NIRS Heart rate, alpha and beta bands power, blinking rate, and eye closure duration Fisher’s linear discriminant analysis method A new approach that combined EEG and NIRS to detect driver drowsiness. The most informative parameters were the frontal beta band and the oxygenation. As for classification, Fisher’s linear discriminant analysis method was used. Additionally, time series analysis was employed to predict drowsiness. Accuracy: 79.2% MIT/BIH polysomnographic database [38]
[39] Multi-channel amplifier with active electrodes, projection screen, and touch screen Biological-based features and contextual information EEG signal: power spectra, five frequency characteristics, along with four power ratiosEOG signal: blinking duration and PERCLOS contextual information: the driving conditions (lighting condition and driving environment) and sleep/wake predictor value. KNN, SVM, case-based reasoning, and RF Used EOG, EEG, and contextual information. The scheme contained five sub-modules. Overall, the SVM classifier showed the best performance. Accuracy:
SVM multiclass classification: 79%
SVM binary classification: 93%
Sensitivity:
SVM multiclass classification: 74%
SVM binary classification: 94%.
Prepared their own data
[40] Smartphone Image-based features, as well as voice and touch information PERCLOS, vocal data, touch response data Linear SVM Utilized a smartphone for DDD. The system used three verification stages in the process of detection. If drowsiness is verified, an alarm will be initiated. Accuracy: 93.33% Prepared their own dataset called ‘Invedrifac’ [41]
[42] Driving simulator and monitoring system Biological-, image-, and vehicle-based features 80 features were extracted: PERCLOS, SWA, LF/HF, etc. RF and majority voting (logistic regression, SVM, KNN) classifiers Vehicle-based, physiological, and behavioral signs were used in this system. Two ways for labeling the driver’s drowsiness state were used, slightly drowsy and moderately drowsy. Accuracy, sensitivity, and precision:
RF classifier:
Slightly drowsy labeling: 82.4%, 84.1%, and 81.6%
Majority voting:
Moderately drowsy labeling: 95.4%, 92.9%, and 97.1%
Prepared their own dataset

3. Conclusions

Over the past decade, the drowsiness detection field has experienced significant enhancements, due to technological advancements in IoT, sensor miniaturization, and artificial intelligence. Herein has presented a detailed and up-to-date conclusion of the driver drowsiness detection systems that have been implemented in the last ten years. It has described the four main approaches followed in designing DDD systems and categorized them based on the type of drowsiness indicative parameters employed. These four categories are image-, biological-, vehicle-, and hybrid-based systems.
5G networks are expected to play a prominent role in enhancing DDD systems. With 5G connectivity, future DDD systems will be based on real driving scenarios. The data will be obtained from various drivers in actual vehicles, where factors such as ambient light, road surface vibrations, and individual differences among drivers are considered. The use of 5G connectivity will also enable the use of multi-access edge computing power for deep learning, resulting in highly accurate real-time decisions. Vehicles are expected to operate as members of Internet of vehicle networks, enabling the network to warn the drowsy driver, take control of the car (if needed), and contact neighboring vehicles in the network to alert them about the weary driver. These technologies will lead to safer roads and pave the way towards realizing smart cities.
Herein conclude by emphasizing that DDD technology has enormous market potential. Many car manufacturers, such as Toyota and Nissan, have recently installed or upgraded driver assistance devices in their products. The artificial intelligence and deep learning fields are developing tremendously. Soon, the DDD systems will most likely evolve, enabling the formation of smart cities.

Abbreviations

The nomenclature abbreviations, shown in Nomenclature, were used in this manuscript.
Nomenclature
NHTSA National highway traffic safety administration
DDD Driver drowsiness detection
IoT Internet of things
ML Machine learning
PERCLOS Percentage of eyelid closure
EAR Eye aspect ratio
SVM Support vector machine
KNN K-nearest neighbor
RF Random forest
ANN Artificial neural networks
CNN Convolutional neural network
EEG Electroencephalography
ECG Electrocardiography
PPG Photoplethysmography
HRV Heart rate variability
EOG Electrooculography
EMG Electromyography
HF High frequency
LF Low frequency
LF/HF Low to high frequency
SWA Steering wheel angle
ANFIS Adaptive neuro-fuzzy inference systems
MOL Multilevel ordered logit
BPNN Back propagation neural network
NIRS Near-infrared spectroscopy

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