EP3583540A1

EP3583540A1 - System and method for detecting the fatigue of a vehicle driver

Info

Publication number: EP3583540A1
Application number: EP17800733.2A
Authority: EP
Inventors: Elisabeth Schmidt; Stefan Wiedemann
Original assignee: Bayerische Motoren Werke AG
Current assignee: Bayerische Motoren Werke AG
Priority date: 2017-02-20
Filing date: 2017-11-02
Publication date: 2019-12-25
Also published as: US20190370582A1; DE102017202659A1; WO2018149519A1; US10832068B2; CN110313007A; CN110313007B

Abstract

The invention relates to a system for the exact detection of the fatigue of a driver of a vehicle. The system comprises at least one camera for detecting the pupil diameter of the driver of the vehicle; at least one sensor for detecting a current luminance in the vehicle; and at least one computer module for detecting the fatigue of the driver of the vehicle by calculation, wherein the calculation is based on the detected pupil diameter and the detected, current luminance in the vehicle.

Description

System and method for detecting the fatigue of a driver

The present invention relates to a system and method for detecting the fatigue of a driver of a vehicle.

It is known that drivers of vehicles or drivers a particularly high

Have to have constant attention (vigilance). If the height of the driver's attention falls, for example as a result of tiredness due to lack of sleep and / or a monotonous driving situation, the risk of accidents increases and thus represents a risk for the driver and other road users. It may be drivers of vehicles even during day trips difficult to maintain a constant attention to the vehicle. This is especially true for long and monotonous routes such as. Motorway trips too. One challenge with fatigue detection systems for a driver of a vehicle is to be sure of when the driver is experiencing fatigue. If the fatigue is erroneously recognized (i.e., the vigilance of the leader of the

Vehicle is present), so appropriate measures for the driver are highly uncomfortable. If, however, fatigue or a reduction in vigilance is incorrectly not recognized, this represents a danger to the vehicle driver and the road users involved.

The object of the invention is to avoid the above-mentioned disadvantages and to provide a solution which provides an accurate detection of the fatigue of the leader

Vehicle allows. This object is achieved by the features of the independent claims. Preferred embodiments are subject of the dependent claims.

According to a first aspect, there is provided a system for accurately detecting the fatigue of a driver of a vehicle, comprising:

at least one camera for detecting the pupil diameter of the leader of

vehicle;

at least one sensor for detecting a timely luminance in the vehicle; and

l at least one calculation module for detecting the fatigue of the driver of the vehicle by calculation, wherein the calculation based on the detected pupil diameter and the detected, timely luminance in the vehicle. The vehicle may be, for example, a motor vehicle, a rail vehicle, an aircraft, a watercraft, etc. In the vehicle, at least one camera can be arranged, which is designed to recognize the pupil diameter of the driver of the vehicle (also referred to below as the driver). In addition, the vehicle may include at least one sensor for detecting a timely luminance in the vehicle. The luminance of a surface determines with which surface brightness the eye of the driver perceives the surface and thus has a direct relation to the optical

Sensory perception. The vehicle also includes a computing module configured to detect the fatigue of the driver of the vehicle by calculation. The calculation is based on the pupil diameter detected by the at least one camera and the detected, up-to-date luminance in the vehicle.

The at least one camera preferably comprises a high-resolution interior camera and / or a high-resolution infrared camera. The at least one camera may include a high-resolution interior camera.

Advantageously, by a high-resolution interior camera of the

Pupil diameter can be determined very accurately. In addition, or alternatively, the at least one camera may comprise a high-resolution infrared camera. Advantageously, the pupil diameter can still be determined very precisely even in very poor lighting conditions in the vehicle. The high-resolution interior camera and the high-resolution infrared camera can be implemented in a camera module. In another example, these may be implemented in different camera modules. The at least one camera can be any and / or suitable numerical combination

Indoor cameras and / or infrared cameras include.

Preferably, the at least one sensor for detecting the up-to-date luminance in the vehicle comprises a sensor for the automatic driving light control, AFL sensor. For example, the sensor for the automatic driving light control (AFL sensor) can detect a current luminance x. If the AFL sensor is for example arranged to detect an illumination intensity E on the vehicle environment (ie, which luminous flux in lumen, Im, to the vehicle surrounded unit area in m ² falls, Lux, Ix, named: l lx = 1 ^) , a corresponding conversion can first be done in the light intensity in cd and then in the (current) luminance x in cd / m ² .

/ E - r ²

X ⁼ A = -

Here, the luminance x [cd / m ² ] is the quotient of light intensity I [cd] and the visible illuminated area [m ² ]. The light intensity I [cd] is the product on the illuminance E [Ix] and the squared distance r [m] between the illuminated surface and the eye. The

Parameters A and r are mainly determined by the size of the windshield and the distance between the eye and the windshields and are in the range A = 1, 5m-2.5m and r = 0.5m-0.9m. The conversion can be done for example by the computing module or any other suitable module with appropriate computing capacity in the vehicle. Advantageously, such an AFL sensor already installed in the vehicle (in addition to the automatic driving light control of the vehicle) can be used for detecting the current luminance x, so that there is no need for an additional sensor for detecting the current luminance in the vehicle.

Preferably, the detection of the fatigue of the driver of the vehicle by the computing module comprises:

Calculation of the pupil diameter with reference to the detected, up-to-the-minute

Luminance;

Comparison of the recorded pupil diameter with the calculated one

Pupil diameter with respect to the detected luminance; and

if the detected pupil diameter is more than a constant range [k-0.3mm; k + 1, 4mm] is a constant k = 0.6mm less than the calculated pupil diameter:

Detecting the fatigue of the driver of the vehicle,

wherein the detection of the fatigue of the driver of the vehicle by a temporal correction factor with respect to the speed of reduction of the

Pupil diameter; and / or a sensor for high beam regulation can be corrected. The calculation of the pupil diameter D _x in [mm] with respect to the detected, current luminance x can be calculated, for example, by the following formula: β _ ^ Q 0.8558-0.000401 + 8.4) ³

However, this calculation applies only to the pupil diameter with respect to the current luminance x (that is, without further influencing factors).

The detected pupil diameter D _xy, on the other hand, indicates the pupil diameter of the driver with respect to the current luminance x and the fatigue of the driver y and can be represented as follows:

Γ) _ - ^ g0,8558-0,00040l (iO5X + 8,4) ³ _. y

The following now applies:

If

D _x -D _xy > [k- 0.3mm; k + 1.4mm], where k = 0.6mm; then there is a tiredness of the driver. In order to achieve a particularly accurate determination of fatigue and thus avoid a false alarm in the detection of fatigue, preferably the fatigue for [k - 0.1mm; k + 1.4mm].

The calculation of the fatigue of the driver of the vehicle by the computing unit may include appropriate correction factors. For example, a correction factor with respect to the speed of reduction of the pupil diameter of the driver can be introduced or used, for example, by a temporal derivative of the pupil diameter of the driver. For example, if the pupil diameter of the driver decreases very rapidly, then the cause is a sudden incidence of light, and the detection of the

Fatigue caused by the calculation module does not occur. Reduced, however, the

The pupil diameter of the driver slowly over time (see Figure 3 and Figure 4), then the detection of fatigue by the computing module.

The correction factor can result, for example, from the following formula:

AD mm

if -> -0.05, then the narrowing of the pupil diameter is fatigued AD mm

if- <-0.05, άαηη is the constriction of the pupil diameter due to the incidence of light

D = detected pupil diameter of the driver 120;

t = time (point);

AD _ D ₂ - £> _!

At ^~ t ₂ - t '

ie the difference of the pupil diameter D ₂ detected by the camera at time t ₂ and the pupil diameter Di recorded by the camera at time ti in relation to the distance of time t ₂ at time ti. In another example, the computing module may also be previously for the driver

(For example, in a storage unit in the vehicle) stored data for

Gain pupil diameter on alertness and / or fatigue to further refine driver fatigue calculations. Additionally or alternatively, the up-to-date luminance x can be corrected or regulated by the automatic high beam light sensor. Advantageously, can be detected by the use of the sensor for automatic high beam light control, for example, at night driving an oncoming vehicle with the light on. From this, a correction factor for influencing the pupil diameter of the driver by the light of oncoming vehicles can be taken into account. The correction factor may include suspending the driver's fatigue calculation by the computing module when the oncoming vehicle is oncoming light detected by the automatic high beam light sensor. Optionally, the computing module may take into account other correction factors in the calculation of the driver's fatigue, e.g. Day and / or seasons and / or current weather conditions in connection with the vehicle orientation. The

Vehicle orientation can be determined, for example, by a navigation system in the vehicle, with data relating to the daily and / or seasons and current

Weather conditions can be obtained from a storage unit in the vehicle and / or one or more (backend) servers. Preferably, the system further comprises:

at least one control unit, wherein the control unit is set up to initiate at least a corresponding countermeasure when the driver of the vehicle detects tiredness. For example, the countermeasure may be an optical (eg via a

Output unit in the vehicle) and / or acoustic (for example via a speaker in the vehicle) and / or to reduce the interior temperature, for example by a

appropriate temperature control via the air conditioning in the vehicle act.

According to a second aspect of the present invention, the underlying object is achieved by a method for accurately detecting the fatigue of a driver of a vehicle, comprising:

Detecting, by at least one camera, the pupil diameter of the leader of the

vehicle;

Detecting, by at least one sensor, a timely luminance in the vehicle; and

Recognizing, by calculation in a calculation module, whether the driver of the vehicle is fatigued, the calculation being based on the detected pupil diameter and the detected, up-to-date luminance in the vehicle.

The at least one camera preferably comprises a high-resolution interior camera and / or a high-resolution infrared camera.

Preferably, the at least one sensor for detecting the up-to-date luminance in the vehicle comprises a sensor for the automatic driving light control, AFL sensor.

Calculate the pupil diameter with reference to the detected, timely

Luminance;

Comparing the detected pupil diameter with the calculated one

Pupil diameter with respect to the detected luminance; and

if the detected pupil diameter is more than a constant range [k-0.3; k + 1, 4] is a constant k = 0.6 mm less than the calculated pupil diameter:

Recognizing the fatigue of the driver of the vehicle; wherein detecting the fatigue of the driver of the vehicle by a temporal correction factor with respect to the speed of reduction of the

Pupil diameter; and / or a sensor for high beam regulation can be corrected. In addition, the method preferably includes initiating, by means of at least one control unit, a countermeasure when fatigue is detected.

These and other objects, features and advantages of the present invention will become more apparent from a study of the following detailed description of preferred embodiments and the accompanying drawings. It will be appreciated that although embodiments are described separately, individual features thereof may be combined to form additional embodiments.

Fig. 1 shows an exemplary system for the exact detection of fatigue of a

Leader of a vehicle;

Fig. 2 shows an exemplary method for the exact detection of fatigue

a driver of a vehicle;

Fig. 3 shows a decrease in the pupil diameter of subjects at

monotonous driving with time in constant light conditions, whereby the subjects were confronted with external stimuli at certain times;

FIG. 4 shows an exemplary decrease of the pupil diameter of subjects during monotonous driving and constant light conditions with time as well as the positive influence of an external stimulus on the fatigue of the person

Volunteers.

FIG. 1 shows an exemplary system 100 for the exact detection of the tiredness of a driver 120 of a vehicle 110 (hereinafter also referred to as driver 120). The vehicle 110 may be, for example, a motor vehicle, a rail vehicle, an aircraft, a watercraft, etc. The system 100 includes at least one camera 1 12 for detecting the pupil diameter of the driver 120. The at least one camera 1 12 can include a high-resolution indoor camera. Advantageously, the pupil diameter of the driver 120 can be determined very accurately by means of a high-resolution interior camera. In addition, or alternatively, the at least one camera 12 may comprise a high-resolution infrared camera. Advantageously, the pupil diameter of the driver 120 can still be determined very accurately even in very poor light conditions (eg darkness, tunnels, etc.) in the vehicle 110. The high-resolution interior camera and the high-resolution infrared camera can be implemented in a camera module. In another example, these may be implemented in different camera modules. The at least one camera 12 may comprise any desired and / or suitable numerical combination of interior cameras and / or infrared cameras.

The system 100 also includes at least one sensor 1 16 A for detecting a

Timing luminance in the vehicle 100. The luminance (of a surface in the vehicle 1 10) determines the surface brightness with which the eye of the driver 120 perceives the surface and thus has a direct relation to the visual sensory perception. The at least one sensor 1 16 A for detecting the timely luminance in the vehicle 1 10 may include a sensor for the automatic driving light control, AFL sensor 1 16 A.

The sensor for the automatic driving light control (AFL sensor) 1 16 A, for example, a timely luminance x detect. For example, if the AFL sensor 1 16 A is configured to detect illuminance on the vehicle surroundings (ie, which luminous flux in lumens, Im, falls on a unit area surrounding the vehicle in m ² , also Lux,

Ix, called: l lx = 1 ^), a corresponding conversion can be made first in the light intensity in cd and finally in the (current) luminance x in cd / m ² .

/ E - r ²

= - = -

A A

Parameters A and r are mainly determined by the size of the windshield and the distance between the eye and the windshields and are in the range A = 1, 5m-2.5m and r = 0.5m-0.9m. The conversion can for example be done by the computing module 1 14, see below, or any other suitable module (not shown) with corresponding computing capacity in the vehicle 1 10. Advantageously, such an AFL sensor 1 16 A already installed in the vehicle 1 10 (in addition to the automatic driving light control of the vehicle 1 10) can be used for detecting the current luminance x, so that there is no additional sensor for detecting the timely luminance in the vehicle 1 10 needs.

The system 100 may further comprise at least one calculation module 1 14 for detecting the fatigue of the driver of the vehicle 120 by calculation, wherein the calculation based on the detected pupil diameter and the detected, timely luminance in the vehicle 1 10. The computing module 1 14 may perform the calculation based on the detected by the at least one camera 1 12 pupil diameter of the driver 120 and the detected by the at least one sensor 1 16 A, timely luminance in the vehicle 1 10. In particular, the computing module 1 14, the calculation of the

Pupil diameter D _x in [mm] with respect to the detected timely luminance x, for example, by referring to the following formula:

ß _ ^ Q 0,8558-0,000401 +8,4) ³

However, this calculation applies only to the pupil diameter with respect to the timely luminance x (i.e., without other influencing factors such as the tiredness of the driver 120).

The pupil diameter D _xy detected by the at least one camera 12, on the other hand, indicates the pupil diameter of the driver 120 with reference to the current luminance x and the fatigue of the driver y and can be represented as follows:

D = - Q0,8558-0,00040l +8,4) ³ _. y

In a next step, a comparison of the pupil diameter detected by the at least one camera 12 with the pupil diameter calculated by the computing module 1 14 can be compared

Pupil diameter with respect to the detected luminance done. If the pupil diameter detected by the at least one camera 12 is more than a range [k-0.3 mm; k + 1, 4mm] is a constant k = 0.6mm less than the calculated one

Pupil diameter, i. if

D _x -D _xy > [k- 0.3mm; k + 1.4mm], where k = 0.6mm; Then, the tiredness of the driver 120 of the vehicle 110 is detected. To obtain a particularly accurate determination of fatigue and thus a false alarm in the

To avoid fatigue detection, fatigue for [k - 0,1mm; k +

1.4mm], where k = 0.6mm are determined.

The calculation of the fatigue of the driver 120 of the vehicle 1 10 by the computing unit 1 14 may include appropriate correction factors. For example, a

Correction factor with respect to the speed of reduction of the pupil diameter of the driver 120 may be introduced or used, for example, by taking a time derivative of the pupil diameter of the driver 120. For example, if the pupil diameter of the driver 120 decreases very rapidly, then the cause is a sudden one

Light incidence, and the detection of fatigue by the computing module 1 14 does not take place.

If, on the other hand, the pupil diameter of the driver 120 reduces slowly over time (cf., FIGS. 3 and 4), then the fatigue detection is performed by the computing module 1 14.

The correction factor can result, for example, from the following formula:

AD mm

if-> -0.05, then the narrowing of the pupil diameter is fatigued

AD mm

if <-0.05, then the constriction of the pupil diameter is due to the incidence of light

D = detected pupil diameter of the driver 120;

t = time (point);

AD D ₂ - D ₁

~ Et ^~ t ₂ - t _t '

ie the difference of the pupil diameter D ₂ detected by the camera at time .2 and the pupil diameter Di detected by the camera at time ti in relation to the distance of time t ₂ at time ti.

In a further example, the computing module 1 14 can also be used for data previously stored for the driver 120 (for example in a memory unit 1 18 in the vehicle 1 10)

Pupil diameter on wakefulness and / or fatigue to further clarify the driver's fatigue calculation. Additionally or alternatively, the up-to-the-minute luminance x can be corrected or regulated by the automatic highbeam control sensor 1 16 B Advantageously, by using the sensor for automatic high beam regulation 1 16 B, for example, a night driving

oncoming vehicle are detected with the light on. From this, a correction factor for influencing the pupil diameter of the driver 120 by the light of oncoming vehicles can be considered. The correction factor may be detected by the sensor for automatic high beam regulation 1 16 B,

Oncoming vehicle with the light on the suspension of the calculation of the fatigue of the driver 120 by the computing module 1 14 include. Optionally, that can

Calculation module 1 14 take into account further correction factors in the calculation of the driver's fatigue 120, e.g. Daily and / or seasons and / or current

Weather conditions in connection with the vehicle orientation. The vehicle orientation can be determined, for example, by a navigation system in the vehicle, wherein data relating to the times of day and / or seasons and current weather conditions can be obtained from a memory unit 118 in the vehicle 110 and / or from one or more (backend) servers 130 ,

The system 100 may further comprise at least one control unit 118, wherein the

Control unit 1 18 is set to initiate at least recognized a corresponding countermeasure if fatigue of the driver 120 or driver 120 of the vehicle 1 10 detected.

For example, the countermeasure may be an optical (e.g.

Output unit in the on-board computer of the vehicle 1 10) and / or acoustic (for example via a speaker in the vehicle 1 10) and / or a reduction in the interior temperature, for example by a corresponding temperature control via the air conditioning in

Vehicle 1 10 act, as exemplified below with reference to Figures 3 and 4 explained.

FIG. 2 shows an exemplary method 200 for the exact detection of the fatigue of a driver 120 of a vehicle 110 (hereinafter also referred to as driver 120), wherein the

Method steps can be performed by a system 100 as described with reference to Figure 1, and the method steps can be carried out as described with reference to Figure 1. The method comprises:

Detecting 210, by at least one camera 1 12, the pupil diameter of the guide 120 of the vehicle 1 10, wherein the at least one camera 1 12 may include a high-resolution interior camera and / or a high-resolution infrared camera. Detecting 220, by at least one sensor 1 16 A, a timely luminance in the vehicle 1 10, wherein the at least one sensor 1 16 A may include a sensor for the automatic driving light control, AFL sensor 1 16 A; and

Detect 230, by calculation in a computing module 1 14, if there is fatigue of the driver 120 of the vehicle 1 10, wherein the calculation based on the at least one camera 1 12 detected pupil diameter and the detected, timely luminance in the vehicle 1 10.

Detecting 230 the fatigue of the driver 120 of the vehicle 1 10 (or driver 120) by the computing module 14 may include:

Calculating 232 the pupil diameter with respect to the, by the at least one sensor 1 16 A detected, timely luminance;

Compare 234 of the detected by the at least one camera 1 12

Pupil diameter with the pupil diameter calculated by the calculation module 1 14 with respect to the detected luminance; and

if the pupil diameter detected by the at least one camera 12 is more than a constant range [k-0.3; k + 1, 4] is a constant k = 0.6 mm smaller than the pupil diameter calculated by the calculation module 1 14:

Recognizing 236 the fatigue of the driver 120 of the vehicle 122;

wherein the recognition 236 of the fatigue of the driver 120 of the vehicle 1 10 by a temporal correction factor with respect to the speed of reduction of the

Pupil diameter; and / or a sensor for high beam regulation 1 16 B can be corrected. The method may also include initiating 240, by at least one control unit 118, a countermeasure of fatigue 236 detected by the computing module 1 14, as described with reference to FIGS. 3 and 4, for example.

FIG. 3 shows a decrease in the average pupil diameter in millimeters (mm) 310 of subjects during monotonous travel over time in minutes (min) 320, whereby the subjects were confronted with external stimuli at specific times, in particular in minutes 5, 10 and 27 , These are average values of two monotonous rides of a large number of subjects, which clearly show that the monotone rides continuously increase the tiredness of the subjects and thus continuously reduce the pupil diameter. In particular, it was possible to establish that the pupil diameter of the test persons already appears at half-hourly journeys as shown in FIGS. 3 and 4 on the basis of

Fatigue already reduced by about 0.6 mm. The enlargement of the

Pupil diameters in minutes 5, 10 and 27 were created in particular by verbal questioning of the subjects during the test drives in the simulator. In particular, this involves the evaluation or results of a driving simulator study. It thus turns out that a cognitive effort, such as the answer to questions, a widening of the pupil diameter and thus an increased alertness or an increased

Attention level includes.

FIG. 4 shows an exemplary decrease in the diameter of the pupil in mm 410 of subjects during monotonous driving with time in min 420. In particular, the positive influence of an external stimulus on the fatigue of the subjects is shown as of minute 20 as the result of another driving simulator study. A first trip was performed similar to that described with reference to FIG. 3 (= monotone drive) with polls in minutes 6 and 16 (= monotonous drive 430). In a second monotonous journey (= countermeasure 440), a minute from 20 minutes

Countermeasure initiated, in this case by activation of the respective subjects by a thermal stimulus. It can be clearly seen that the thermal stimulus affects the enlargement of the pupil diameter of the subjects. It turned out that the difference of the pupil diameter between the monotone drive 430 and the drive with countermeasure 440 the marked minutes with ^* or ^{** shows} a statistically significant difference, in which the differences of the pupil diameter of the subjects are no longer due to scattering or by chance, with ^* a significant difference with p <0.05 and ^** a highly significant difference with p <0.001.

It is thus shown that the pupil diameter is very well suited as indicator for the tiredness or vigilance of drivers, as long as the lighting conditions are constant. The system 100 and method 200 described with reference to FIGS. 1 and 2 now permit accurate detection of the fatigue of drivers 120 by taking into account non-constant lighting conditions related to the pupil diameter.

Claims

claims

1 . A system (100) for accurately detecting the fatigue of a driver (120) of a vehicle (110), comprising:

at least one camera (1 12) for detecting the pupil diameter of the driver (120) of the vehicle (1 10);

at least one sensor (1 16 A) for detecting a timely luminance in the vehicle (1 10); and

at least one computing module (1 14) for detecting the tiredness of the driver (120) of the

Vehicle (1 10) by calculation, with the calculation on the recorded

Pupil diameter and the detected, timely luminance in the vehicle (1 10) based.

2. System (100) according to claim 1, wherein the at least one camera (1 12) comprises a high-resolution interior camera and / or a high-resolution infrared camera.

3. System (100) according to one of the preceding claims, wherein the at least one sensor (1 16 A) for detecting the timely luminance in the vehicle (1 10) comprises a sensor for the automatic driving light control, AFL sensor (1 16 A) ,

4. System (100) according to one of the preceding claims, wherein the detection of the fatigue of the driver (120) of the vehicle (1 10) by the computing module (1 14) comprises:

Luminance;

Comparison of the recorded pupil diameter with the calculated one

Pupil diameter with respect to the detected luminance; and

Detecting the fatigue of the driver (120) of the vehicle (1 10);

wherein the detection of the fatigue of the driver (120) of the vehicle (1 10) by a temporal correction factor with respect to the speed of reduction of the

Pupil diameter; and / or a sensor for high beam regulation (1 16 B) can be corrected.

The system (100) of any one of the preceding claims, further comprising:

at least one control unit (1 18), wherein the control unit (1 18) is arranged to initiate at least one corresponding countermeasure when fatigue of the driver (120) of the vehicle (1 10) is detected.

6. A method (200) for accurately detecting the fatigue of a leader (120) of a

Vehicle (1 10), comprising:

Detecting (210), by at least one camera (1 12), the pupil diameter of the driver (120) of the vehicle (1 10);

Detecting (220), by at least one sensor (1 16 A), a timely luminance in the vehicle (1 10); and

Detecting (230), by calculation in a computing module (1 14), if there is fatigue of the driver (120) of the vehicle (1 10), wherein the calculation on the detected

Pupil diameter and the detected, timely luminance in the vehicle (1 10) based.

7. The method (200) according to claim 6, wherein the at least one camera (1 12) comprises a high-resolution interior camera and / or a high-resolution infrared camera.

8. The method (200) according to claim 6 or 7, wherein the at least one sensor (1 16 A) for detecting the timely luminance in the vehicle (1 10) has a sensor for automatic

Driving light control, AFL sensor (1 16 A) AFL sensor, includes.

9. Method (200) according to one of claims 6 to 8, wherein the recognition of the

Fatigue of the driver (120) of the vehicle (1 10) by the computing module (1 14) comprises:

Calculating (232) the pupil diameter with reference to the detected, timely

Luminance;

Comparing (234) the detected pupil diameter with the calculated one

Pupil diameter with respect to the detected luminance; and

Recognizing (236) the fatigue of the driver of the vehicle (1 10),

wherein recognizing (236) the fatigue of the driver (120) of the vehicle (110) by a time related correction factor with respect to the speed of reduction of the vehicle Pupil diameter; and / or a sensor for high beam regulation (1 16 B) can be corrected.

The method (200) of any one of claims 6 to 9, further comprising:

Initiate (240), by at least one control unit (1 18), a countermeasure when detected fatigue.