JPS60178596A - Dozing driving preventor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drowsy driving prevention device that detects drowsiness in vehicle driving sounds and provides a wake-up effect to the driver.

[Prior Art] In recent years, with the development of electronic 11i control equipment, new devices have been developed with the aim of improving vehicle accident avoidance, and one of these is the prevention of drowsy driving by drivers. A device to prevent drowsy driving is being considered, which detects the driver and issues a warning to the driver to prevent drowsy driving.

By the way, conventional drowsy-driving prevention devices focus on steering movements to prevent the driver from falling asleep while driving.
If the driver makes periodic steering wheel imitations that appear to be similar to that of a driver, the system determines that the driver is falling asleep at the wheel and warns the driver. Therefore, the accuracy of detecting drowsy driving is low, and erroneous determination of drowsy driving may be made due to vehicle driving conditions such as road surface conditions or the driver's conscious steering operation. There is also the problem that detecting drowsy driving based on steering wheel operations requires a certain amount of driving distance, so detection takes time.

[Purpose of the Invention] Therefore, the present invention takes note of the periodic movement of the driver's upper body during drowsy driving, detects drowsy driving from changes in the driver's upper body position, and provides a wake-up effect to the driver. By providing a drowsy driving prevention device, it is possible to more quickly and accurately detect drowsy driving and prevent accidents caused by drowsy driving.

[Structure of the Invention] As shown in FIG. 1, the structure of the present invention, which has been made to achieve the above object, includes a means I for detecting the body position of a vehicle driver, and a means for detecting the detected body position periodically. A drowsy driving detection means ■ detects drowsy driving by the driver based on the fluctuation; and a notification means ■ issues a warning to the driver when drowsy driving is detected by the drowsy driving detection means ■. The gist of this paper is a drowsy driving prevention device that is characterized by:

[Example] Hereinafter, the drowsy driving prevention device of the present invention will be described with reference to the drawings and examples.

FIG. 2 is a layout diagram of the instrument panel and seat of a vehicle in which the IFT device is installed during drowsy driving. In the figure, 1 is the driver, 2 is the driver's seat, 3 is the passenger seat, 4
is the steering wheel, 5 is the air outlet of the air conditioner,
Reference numeral 6 designates an air conditioner operation unit equipped with an air conditioner operating switch and a temperature setting device, 7 a car radio, and 8 a speaker. Also, 10 is equipped with a speedometer etc.
In addition to the normally installed instruments, the instrument panel 10 is equipped with a light emitting section 11 for detecting the riding position of the driver 1, and image detection devices 1112 and 13.

The light emitting unit 11 and the image detecting units 12 and 13 are installed on the instrument panel 10 so that the upper body of the driver 1 can be seen from these devices, that is, without being obstructed by the steering wheel 4, as is clear from the figure. A light emitting unit 11 is installed at a central position in the left-right direction of the driver's seat 2, and image detecting units 12 and 13 are installed at symmetrical positions of the driver's seat 2, respectively.

In this embodiment, when it is detected that the driver 1 is falling asleep, cold air is blown from the air outlet 5 of the air conditioner to the face of the driver 1 to wake the driver 1. As shown in Figure 3, the drowsy driving prevention device is installed on the Fmr! ! a room temperature sensor 14 that detects L;
An outside air temperature sensor 15 that detects the outside air temperature, an air conditioner activation switch 16, an air conditioner temperature setting device 17, and an air conditioner 1T-IQ that adjusts the angle of the air direction change plate of the air outlet 5 provided on the driver's seat 2 side. -11 The wind direction sensor 1) which detects the negative angle of the digit is constituted by the wind direction sensor 19 and the control circuit 20. Further, as shown in the figure, the control circuit 20 includes an input/output section 21 equipped with an A/D transformer, an amplifier circuit, etc. for inputting/outputting signals to each of the above-mentioned devices, and a two-dimensional memory storage section 21. A dozing detection process that detects the upper body position Iff of the driver 1 (in this example, the face position) from the image and detects dozing of the driver 1 from periodic fluctuations in the F body position, and when dozing is detected. A CPU 22, CP executes a wake-up process to wake up the driver 1 by blowing cold air to the driver.
71 when executing abstract processing at LJ 22! 'I It has a ROM 23 in which necessary data is stored in advance, a RAM 24 in which data necessary for executing the weft processing is temporarily stored, and a backup RAM 25 to which power is constantly supplied. The battery 2 is connected to the battery 2 through a power supply circuit 27 directly connected to the battery 26 to supply power, and an ignition switch 28 that supplies power to each part other than the backup RAM 25.
6 and a power supply circuit 29 connected to the power supply circuit 6.

Next, as described above, the actuator 18 is used to adjust the wind direction change plate of the air outlet 5 on the side of the driver's seat 2 and blow cool air to the face of the driver @1. The outlets 5 are the two air outlets 01, the air outlet on the back right side of the two air outlets provided in the center of the instrument panel shown in FIG. 2, and the air outlet at the right end of the instrument panel. Either one of the air outlets. Furthermore, since the air outlet 5 is equipped with a wind direction changing plate that adjusts the wind direction in the horizontal direction and a wind direction changing plate that adjusts the wind direction in the vertical direction, the actuator 18 provided in the air outlet 5 also adjusts the wind direction in each direction. Adjust the angle of the wind direction change plate! l! ! The wind direction sensor 19 similarly includes a left and right detection part 19a that detects the wind direction change plate angle in each direction, and a vertical direction adjustment part 18b that detects the angle of the wind direction change plate in each direction. Part 19b
are provided.

Here, the configuration of the adjustment section 18a (or 18b) will be explained using FIG. 4. As shown in the figure, the adjustment section 18a (or 18b) includes a geared motor 31 in which an electric motor 11J III and a reduction gear are integrated, a pinion 32 stepped on the rotating shaft of the geared motor 31, and a pinion 32 and a gear adapter 34 on which a rack 33 is carved for converting the rotational movement of the geared motor 31 into linear movement. is transmitted to the mounting member 37 of.

Since the wind direction changing plate 36 is installed inside the air outlet 5 so as to be rotatable in the left and right directions around the support member 38,
The linear movement of the mounting member 37 allows the wind direction to be adjusted in the left and right directions. The detection unit 19a (or 19h) of the direction change plate 119 is installed on the gear adapter 34, and the angle of the direction change plate 36 is adjusted between the rack 33 and the pinion 3.
The occlusal position with 2 is hereinafter referred to as the actual rack position. ) and consists of a potentiometer.

Next, the light emitting section 11 and the image detecting sections 12 and 13 are provided in the 31 panel 10 section in front of the driver's seat as described above, but in this embodiment, an infrared strobe is used as the light emitting section 11. , two-dimensional solid-state imaging devices (hereinafter simply referred to as two-dimensional CCD) are used as the image detecting sections 12 and 13, and the respective configurations will be explained using FIGS. 5 and 6.

FIG. 5 is a side view of the light emitting unit 11 using an infrared strobe, where 40 is an infrared light emitter, 41 is a lens for broadly irradiating the driver 1 with infrared light, and 42 is infrared light. 43 is a case, 44 is an inner that fixes the lens 41 and filter 42 to the case 43, and the main light emitting unit 11 is attached to the instrument panel 10 using bolts 45. This is done by screwing together the nut 46.

Here, the filter 42 is intended to block visible light, but this is because the emission spectrum from the infrared emitter 40 does not necessarily include only those in the infrared region, but also includes those in the visible light region. This filter 42 cuts out light with a wavelength of 800 nm or less, for example, so that the driver does not feel dazzled.

9116 is a side view of the image detection unit 19 (or 13) using 9 yRw C(':n, 50 is a two-dimensional CCD mounted on a printed circuit board 51, 52 to 56
60 is a printed circuit board equipped with an image signal control circuit that controls image reading from the two-dimensional CCD 50, and 60 is a lens 6 with a focal length t that focuses the image on the two-dimensional CCD 50.
1. A liquid crystal diaphragm 62 that adjusts the amount of light focused on the two-dimensional CCD 50. A mounting I-adapter incorporating a phototransistor 63 that detects the amount of light focused on the two-dimensional CCD 50. ing. Also, 65 is the case of the main image detection unit 12 (or 13) C1 Norange P 6
6, it is fixed to the instrument panel 10 by screwing together the pole 1-67 and the nut 68.

As shown in FIG. 7, the 14-piece aperture element 62 includes a liquid crystal layer 71, transparent electrode layers 72 and 73 sandwiching the liquid crystal layer 71, and a polarizing plate m74 having polarization planes perpendicular to each other. and 75, and the liquid crystal layer 71 and the transparent electrode layers 72 and 73 are arranged concentrically with a, b, c, d, and 75, respectively, so that the liquid crystal diaphragm element 62 can adjust the amount of light in five stages.
It is classified as e. Each part of the electrode layers 72 and 73, that is, 72a-73a, 72b-73b, 72
cm73c, 72d-73d can be supplied with power at the same time, and depending on the amount of light detected by the phototransistor 63, that is, depending on the current flowing through the phototransistor 63, the electrode layer 72a is supplied from the outside of the electrode layer.
-73a, 72b -73b.

The voltages can be applied in the order of...

Therefore, when no power is applied to each electrode layer,
Since the liquid crystal layer 71 has the property of rotating the polarization plane of transmitted light by 90 degrees, the external light passes through the polarizing plate layer 74 and becomes single-width light.The polarization plane of the external light is rotated by 90 degrees by the liquid crystal 71, and the other polarization It will pass through the plate layer 75,
When a voltage is applied to the electrode layers 72 and 73, the liquid crystal layer 71 changes the crystal alignment direction, so the polarization plane of the single-width light after passing through the polarizer layer 74 is rotated by 900 degrees by the liquid crystal layer 71. Instead, the light is blocked by the other polarizing plate layer 75, and the amount of light passing through the liquid crystal aperture element 62 is significantly reduced.

Therefore, in the image detection units 12 and 13, the amount of light transmitted to the lens 61 side is adjusted by the liquid crystal aperture element 62, so that the average light 1 focused on the entire two-dimensional COD 50 can be kept constant. It becomes like this. The light whose light intensity has been adjusted in this way forms an external image on the two-dimensional CCD 50 by the lens 61, and is suspended by each element of the two-dimensional CCD 50, and is transmitted according to the light intensity for each element. After the charge conversion, it is stored as a charge. In FIG. 7, (a) is a plan view of the liquid crystal diaphragm 62, and (l)
]) shows a sectional view taken along line A-A.

In the present drowsy driving prevention device configured as described above, the control circuit 20 executes processing according to a control program as shown in FIG. 8, and detects drowsy driving based on periodic changes in the driver's facial position. , blows cold air to the driver's face.

As shown in the figure, first, in step 100, initialization processing is executed to set registers, parameters, etc. used in image processing and mirror angle change adjustment processing, which will be described later.
In the next step 200, a drowsiness detection process is executed to detect whether the driver is drowsy while driving. Then, when the driver's drowsy driving is detected in step C 200, step 300 continues.
Then, a wake-up process is executed in which cold air is sent to the driver's face to prevent him from falling asleep while driving.

Note that this control process is performed by the driver operating the key switch.
It starts when the ignition switch 28 is turned on as shown in the figure, and when the ignition switch 28 is turned off.
Until the F state is reached, the processes of step 200 and step 300 are repeatedly executed.

The dozing detection process and the awakening process executed in steps 200 and 300 will be described in detail below.

First, the dozing detection process shown in step 200 is executed according to the control program shown in FIG.

In step 201, a light emission signal for causing the infrared light emitter 40 of the light emitting unit 11 to emit light is output, and a synchronization signal for reading out the two-dimensional image data detected by the image detection units 12 and 13 is output, and each image Detection units 12 and 1
Image No. 48 is read out from each image line by the image signal control circuit mounted on the L-ring mill plates 52 to 56 of No. 3.

In the subsequent step 202, the read image signal is input into the main control circuit 20, and each image detection section 12
and 13 are processed to store the image data Rf and L in a predetermined area set in the RAM 24, and in the next step 203, the input of the image No. 18 is input to each image detection unit 12 and It is determined whether or not the process has been performed for all 13 pixels.Then, this step 2
In step 03, until image signals are input for all pixels, it is determined to be 1'NOJ, and the processes of step 202 and step 203 are repeatedly executed.

Next, when image signals are inputted for all pixels, the process moves to the following step 204, where a binarization process is performed on the image data R[ and [r] stored in a predetermined area of the RAM 24, Binarized image data Rf −, Lf
− is obtained. Here, what is the process of 2 immortalization? 1. The respective gray scale data of the L image data Rf and Lf are compared in size with a predetermined determination level, and portions darker than the determination level are clearly separated into black levels, while portions lighter than the determination level are clearly separated into white levels. This refers to the process of

That is, as shown in FIG. 10, for example, when the image data detected by the image detection section and stored in the RAM 24 is image data Ir (Rr) as shown in (a), 2 of this image data When the digitization process is executed, the image data becomes f'(Rf->) as shown in (b).This binarized image changes depending on the judgment level, but each image is detected by the liquid crystal aperture element 62 described above. Since the amount of light transmitted through the parts 12 and 13 is adjusted, it is easy to set the determination level so that the driver's face is at the white level and the dorsal fin is at the black level, as shown in the figure.

Next, in step 205, step 2 of the above step 204 is performed.
Two binarized image data R obtained by rectification processing
For each f' and if', a process of detecting the maximum open part of the white level area, that is, a process of detecting the driver's face part, is performed, and the process moves to the following step 206.

In step 206, processing is performed to calculate the area center of the white level maximum opening portion of each of the detected binary image data Rf-, Lr"', and in the subsequent step 207, this area center position is calculated on the driver's face. As the special point position of the part,
Processing is performed to calculate the distance 1llld between the image detection unit and the singular point using the principle of a so-called triangulation unit.

That is, first in step 206, as shown in FIG. 11,
A process is performed to calculate the area center P of the most closed part O representing the driver's face, and in the next step 207, this area center P is calculated.
The distance 111id from the image detection unit to the singular point P on the driver's face is calculated from the two image data captured using the following formula (%). Incidentally, as shown in FIG. 12, the above a9 sentence, Xr, and X sentence are as shown in FIG. The distance between the centers in the horizontal direction (x direction) 1Il11(i) indicates the deviation of the area center (singular point) P from the image center for each image detection unit 12.13 with the horizontal center as the base pointJX Store mark (Xr
1)+jL) respectively. Also in this case 1/
f = 1/a + 1/d Since it is assumed that a<d, the distance 1lIlld can also be determined by the following formula. f is the focal length of the lens 61 as described above.

When the distance ll1lld between the singular point P on the driver's face and the image detection unit is calculated in this way, in the following step 208, the deviation XS of the singular point P in the left-right direction (x direction) with respect to the center of the driver's seat is calculated. The process of calculating % is executed using the following formula % formula %. Furthermore, in this formula, the aforementioned distance d
For the same reason as in the case of calculation, it may be set as Xs −Xixd /f−tachi/2.

Next, in step 209, the excluded distance 11
111d, the X coordinate XS, and the special W point position U shown in FIG.
The vertical direction (Y direction) deviation of
Data that three-dimensionally represents singular points on the driver's face (d, x
s, '1/s) in a predetermined area of the backup RAM 25, and the process proceeds to step 210.

In step 210, a process of incrementing the counter i is executed, and in the next step 211, it is determined whether the value of the counter i is above the setting start N1 step. and i
<N, it is determined that I N is 0.1 in step 211, and the process moves to re+X step 201 to detect the position of the singular point P on the driver's face and store it in a predetermined area of the backup RAM 25. A series of processes will be executed.

In addition, N areas from P(0) to P(N-1>) are provided as predetermined areas of the backup RAM 25 in which the singular point P position is stored in step 209, and the singular point P If the position is 1-2, it will be stored in the area P(2).

Next, when i≧N, it is determined as rYES1 in step 211, and the value of counter i is set to "0" in step 212.
Then, the process moves to step 213. Then, in step 213, the backup RAM 2
From the N singular points P positions stored in each area of 5, it is possible to determine whether the driver's face position t has periodically changed, that is, whether the driver's face is in the left-right direction and front-rear direction with respect to the driver's seat. , or by determining whether the driver has periodically moved in a diagonal direction, a process of detecting whether the driver is falling asleep is executed. Note that this process includes, for example, 1. l2 Backup R
Among the singular points P(0) to P(N-1> of NIII stored in AM25, two with a predetermined separation distance
If there are three or more sets of seed position coordinates and the 211 position coordinates are detected alternately, it may be determined that the driver's face position has changed periodically. Alternatively, the moving direction of the singular point may be calculated, and if the moving direction changes in the same direction three or more times, a synchronous change in the driver's face position may be determined.

Next, the driver's face position changes periodically, and step 21
If rYEsJ is determined in step 3, the main dozing detection process is completed, and the process proceeds to the awakening process, not shown in step 300 of FIG. On the other hand, if the position of the driver's face does not change periodically and it is determined as NOJ in step 213, step 2 is repeated.
A series of processes from step 01 to step 211 are repeatedly executed.

Next, the awakening process that is executed when the driver's dozing is detected is executed according to the control program shown in FIG. 13.

When the awakening process is executed as shown in Figure 1, first step 3
At step 01, it is determined whether or not the air conditioner operation switch 16 is in the OFF state, and if the operation switch 16 is in the OFF state, the process moves to step 302 and the operation switch 16 is turned off.
The controller is turned on, and the process moves to the next step 303. On the other hand, if the air conditioner operating switch 16 is in the ON state, the process moves from step 301 to step 303.

In step 303, the room temperature Tin and the outside air ff3 are determined based on the signals from the room temperature sensor 14 and the outside air temperature sensor 15.
7 Detect out. Then, in the next step 304, the air conditioner setting mF[Ts is determined from the map using the detected room temperature and outside temperature as parameters, and the following step 30
Move to 5. The set temperature TS set in step 304 is the temperature of cold air blown to the driver's face in order to prevent the driver from falling asleep while driving, and is set to a temperature lower than the normally set comfortable temperature.

In step 305, the above-determined setting field exactly S
The temperature setting device 17 of the air conditioner is set according to the following, and the process moves to the following step 306.

In step 306, the target rack position (Pao, Pbo) of the actuator 18 is determined in accordance with the position of the singular point P on the driver's face detected when executing the drowsiness detection process.
to exclude. Here, as the position of the singular point P, it is sufficient to use the average position of the N singular point P positions stored in the backup RAM 25. The target rack position of the adjustment unit 18a [Pao is the target rack position pbo of the adjustment unit 18b of the adjustment unit, which is the singularity Each of the points d and YS indicating the position of point P can be obtained from a map in which parameters are used.

In the following step 307, a process is executed to detect the actual rack position If (Pa, Pb) of the actuator 18 from the detection signals of the detection unit 19a and the detection unit 19b, and in the next step 308, the actual rack position If (Pa, Pb) of the actuator 18 is detected. 'l li? / (
P aO, P bo ) and actual position IF'/(Pa,
Pb) difference from I Pao-Pal, l Pbo-P
It is determined whether b I is smaller than the set values εa and εb, respectively.

Then, until l Pao - Pa l < εa te exists, cut Ph0 - PL) l < εb, rNOJ is determined in this step 308, and the process proceeds to step 309, where the rack (O Posted 141!
The actuator 18 is driven so that the rack position Ill (Pao, Pbo) is reached, and the process returns to step 307.

In this way, the actuator 18 is driven, and 1 p
ao-pa 1 < εa, and Pbo-pl
+(・guεI), [YESI
When it is determined that this is the case, the main wake-up process is ended, the process returns to the dozing detection process, and the above-described process is repeatedly executed.

As explained above, in the drowsy driving prevention device of this embodiment, the three-dimensional position of the driver's face is determined by using the area center of the face area obtained from two two-dimensional solid-state image sensors as a singular point, and the singular point The system detects whether the driver is falling asleep when there are periodic changes in position. Therefore, compared to the conventional method of detecting drowsiness while driving based on the driver's steering operation, drowsiness can be detected more quickly and accurately, and there is no possibility of erroneous detection depending on the road the driver is driving. Furthermore, when the system detects that the driver is drowsy while driving, the air conditioner is controlled to blow cool air toward the driver's face until the driver wakes up, thereby increasing the wakefulness effect.

In this embodiment, the control circuit 20 includes the above-mentioned detection means (1).
It includes all of the drowsy driving detection means (■) and the notification means (■), and the light emitting unit 11 and the image detection units 12 and 13 correspond to the detection means (■), and the notification means (■) include the air conditioner and the air conditioner. Examples include a wind direction changing plate 36 provided at the air outlet and an actuator 18 that can adjust the angle of the wind direction changing plate 36.

In the above embodiment, the air conditioner is used to send cold air to the driver's face in order to wake up the driver, but a radio speaker may be used to emit a warning sound, or a warning sound may be emitted in advance. Memorize the signal, for example [
Please take a break.

A first-class voice may be emitted. Furthermore, use both the alarm sound and cold air from the air conditioner air outlet, or install something that stimulates the driver, such as a diaphragm, in the driver's seat), and make sure to wake up the driver with J:. can also be considered.

Further, in the above embodiment, a two-dimensional solid-state thermal @ element is used to detect the singular point position of the driver's face, but in addition, for example, a two-dimensional solid-state road image element 1 [1i1 and an ultrasonic transceiver] are used. The position of the driver's nose is detected from the two-dimensional image detected by the two-dimensional solid-state Ili image element, and the position of the nose is detected by the ultrasonic transmitter/receiver. You can also do this. The reason for detecting the position of the nose in this case is that the nose is the most prominent part of the human face and is easy to detect with an ultrasonic transmitter/receiver. In addition, it is also possible to detect the three-dimensional position of the eye by scanning the ultrasonic beam using only an ultrasonic transmitter/receiver on the instep.

Furthermore, in the embodiment described in E, it is possible to detect the driver's drowsiness.
As the driver's body position to detect the driver's body position, we use the singular point position of the driving @ face area obtained from two image data, but in addition, for example, the position of the driver's eyes, the position of the nose, A two-body position that can detect head position, shoulder position, etc. would be useful, for example, detecting the position of the driver's eyes and automatically adjusting the angle of the rearview mirror, or detecting the position of the head and adjusting the headrest. The position may be adjusted, or the position of the shoulder may be detected to adjust the tilt amount of the tilt steering at the same time.

[Advantageous Effects of the Invention 1] As detailed above, the drowsy driving prevention device of the present invention is equipped with a detection means for detecting the position of the driver's body, detects drowsiness from periodic fluctuations in the body position, and detects the drowsiness while driving. We are trying to issue a warning.

Therefore, drowsiness of the driver can be detected quickly and accurately to prevent drowsy driving, and the occurrence of accidents caused by drowsy driving can be suppressed.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the present invention, Figs. 2 to 13 show embodiments of the present invention, Fig. 2 is a layout diagram showing the instrument panel and seats in the vehicle interior, and Fig. 3 is a diagram of the entire device. FIG. 4 is an explanatory diagram showing the structure of the actuator, FIG. 5 is a partial sectional view showing the structure of the optical section 11, and FIG. 6 is a block diagram showing the structure of the image detecting section 12 (or 13). The partial sectional view shown in FIG. 7 shows the m structure of the liquid crystal aperture element 62,
(A) is a plan view, (B) is a sectional view taken along line A-A, FIG. 8 is a flowchart showing the control program executed by the control circuit 20, FIG. 9 is a flowchart showing the dozing detection process, The figures show image data, (a) is an image data diagram obtained by the image detection unit 12 (or 13), (b) is a binarized image data diagram obtained by binarization processing, 11th 1-Image data diagram; FIG. 12 is an explanatory diagram illustrating the calculation method of the singular point position for the image detection units 12 and 13; and FIG.
The figure is a flowchart showing the awakening process. 5...Air outlet 11...Light emitting unit 12.13...Image detection unit 14...Room temperature sensor 15...Outside temperature sensor 16...Activation switch 17...Temperature setting device 18... Actuator 20... Control circuit 36... Wind direction change plate agent Patent attorney Tsutomu Sadatsu et al. 11", a Figure 4/78a (78b) Figure 5 6 "1 R 7 Figure (A) (B) 73b 73d Figure 8 Figure 10 Figure 11 X coordinate Patent applicant address 1-1 Showacho, Kariya City, Aichi Prefecture Name (426) Nippon Denso Co., Ltd. Representative Door 1) Kengo 4, Agent 460 Address Nagoya City Naka Address: 2-9127 Nishiki, Naka-ku, Nagoya City 2-9-27 Nishiki, Naka-ku, Nagoya 2-9-27 Nishiki, Naka-ku, Nagoya City, Japan , Contents of the amendment (1) 1 on page 15, line 11 of Ming #I West. In addition, the image data diagram shown in Figure 10 (A) is a diagram that schematically represents the W4 light of the actual image data using the density of diagonal lines. , and as shown in FIG. 10 (b)...'' is corrected. (2) In the first line of page 27 of Meiji Ill., the phrase ``obtained image data diagram'' is corrected to ``image data diagram schematically representing the obtained image data with the density of diagonal lines.''

Claims (1)

[Scope of Claims] 111 A device for detecting the body position of a vehicle driver; a drowsy driving detection device for detecting drowsy driving of the driver from periodic fluctuations in the detected body position; and drowsy driving. A drowsy driving prevention side L2 characterized by comprising: a notification means for issuing a warning to the driver when drowsiness is detected by the detection means; and two detection means provided in front of the driver's seat. A drowsy driving prevention device according to claim 1, comprising a two-dimensional solid-state image sensing element. 3. The drowsy driving prevention device according to claim 1, wherein the detection means includes one two-dimensional solid-state image sensor and an ultrasonic transmitter/receiver provided in front of the driver's seat. The drowsy driving prevention device according to claim 1, comprising a wave transmitter/receiver. 5. The drowsy driving prevention device according to any one of claims 1 to 5, wherein the notification means emits sound and/or wind.