JP2021002181A - Detection system - Google Patents

Abstract

To provide a detection system capable of appropriately detecting a position of a detection target in the eyes of an occupant.SOLUTION: A detection system 1 comprises an LED unit 20, a camera 10, a spectacles wearing determination unit 31, a position detection unit 32, and a control unit 34. The LED unit 20 comprises a light source 21 and an irradiation direction changing unit 22. The irradiation direction changing unit 22 changes an irradiation direction of light that is emitted from the light source 21 toward the face of a driver P. The position detection unit 32 detects a position of the pupil E in an eye of the driver P based on an image captured by the camera 10. The control unit 34 determines that the driver P is wearing a pair of spectacles G by the spectacles wearing determination unit 31, and controls the irradiation direction changing unit 22 to change the irradiation direction of the light that is emitted from the light source 21 to a direction that is different from the current irradiation direction so as to detect the position of the pupil E if the position detection unit 32 cannot detect the position of the pupil E.SELECTED DRAWING: Figure 1

Description

The present invention relates to a detection system.

Conventionally, as a detection system, for example, Patent Document 1 includes a light projecting means for projecting light toward the driver's eyeball and an imaging unit for capturing a driver's face image. By properly setting the positional relationship of the means, when the driver wears spectacles, the reflected light reflected on the spectacles does not overlap with the position of the driver's eyes. The device is disclosed.

Japanese Unexamined Patent Publication No. 2012-11976

By the way, in the vehicle face image imaging device described in Patent Document 1 described above, for example, the reflected light reflected on the glasses may overlap with the position of the driver's eyes depending on the difference in the sitting height of the occupant or the change in the posture. Yes, there is room for further improvement in this regard.

Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a detection system capable of appropriately detecting the position of a detection target in the eyes of an occupant.

In order to solve the above-mentioned problems and achieve the object, the detection system according to the present invention irradiates a light source that irradiates light toward the face of a vehicle occupant, and irradiates the light source toward the occupant's face. Based on a light irradiation unit having an irradiation direction changing unit that changes the light irradiation direction, an imaging unit that captures an image by reflected light from the light emitted to the occupant's face, and an image captured by the imaging unit. Determination of the spectacles wearing determination unit for determining the wearing of the spectacles of the occupant, the position detection unit for detecting the position of the detection target in the eyes of the occupant based on the image captured by the imaging unit, and the spectacles wearing determination unit. A control unit that controls the irradiation direction changing unit based on the result and the detection result of the position detection unit is provided, and the control unit determines that the occupant is wearing the spectacles by the spectacles wearing determination unit. If the position of the detection target cannot be detected by the position detection unit, the irradiation direction changing unit is controlled to change the irradiation direction of the light emitted from the light source to a direction different from the current irradiation direction. It is characterized by controlling so as to detect the position of the target.

In the detection system, the light source has a light emitting element that irradiates light, and the irradiation direction changing unit changes the irradiation direction of the light emitted from the light source by changing the direction of the light emitting element. Is preferable.

In the detection system, in the initial state, the light irradiation unit irradiates light along a predetermined reference irradiation direction, and the control unit moves from the light source to a first irradiation direction different from the reference irradiation direction. If the position of the detection target cannot be detected by the position detection unit when irradiating light, the irradiation direction changing unit is controlled to once set the first irradiation direction to the reference irradiation direction, and then the reference irradiation. It is preferable to set the second irradiation direction different from the first irradiation direction from the direction and irradiate the light from the light source.

The detection system further includes a specific unit that specifies the moving direction of the occupant's face from the position of the occupant's face specified based on the image captured by the imaging unit, and the control unit is the position detection unit. When the position of the detection target cannot be detected, when the face of the occupant moves in the specific movement direction specified by the specific unit, the position detection unit can detect the position of the detection target, and then When the position of the detection target cannot be detected by the position detection unit, it is preferable to shift the irradiation direction of the light emitted from the light source in the direction opposite to the specific movement direction.

In the detection system according to the present invention, when the spectacle wearing determination unit determines that the occupant is wearing the spectacles and the position detection unit cannot detect the position of the detection target, the irradiation direction of the light emitted from the light source is currently determined. Since it is controlled to detect the position of the detection target by changing the direction different from the irradiation direction of the occupant, the position of the detection target in the eyes of the occupant can be appropriately detected.

FIG. 1 is a block diagram showing a configuration example of a detection system according to an embodiment. FIG. 2 is a diagram showing an example of superimposition of the pupil and the reflected light according to the embodiment. FIG. 3 is a diagram showing an example of non-superimposition of the pupil and the reflected light according to the embodiment. FIG. 4 is a flowchart showing an operation example of the detection system according to the embodiment.

An embodiment (embodiment) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited to the contents described in the following embodiments. In addition, the components described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described below can be combined as appropriate. In addition, various omissions, substitutions or changes of the configuration can be made without departing from the gist of the present invention.

[Embodiment]
The detection system 1 according to the embodiment will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the detection system 1 according to the embodiment. FIG. 2 is a diagram showing an example of superimposition of the pupil E and the reflected light L according to the embodiment. FIG. 3 is a diagram showing an example of non-superimposition of the pupil E and the reflected light L according to the embodiment. The detection system 1 is mounted on a vehicle and detects the position of a detection target in the eyes of the occupants of the vehicle. The occupant is, for example, the driver P who drives the vehicle. The detection target in the eyes of the driver P is, for example, the pupil E. The detection system 1 outputs the detected information on the pupil E of the driver P to an estimation device (not shown) that estimates the drowsiness, fatigue, etc. of the driver P. Hereinafter, the detection system 1 will be described in detail.

Here, the vertical direction used in the following description is a direction along the height direction of the vehicle, and is typically a direction along the vertical direction. The left-right direction is a direction along the width direction of the vehicle. The vertical and horizontal directions are orthogonal to each other.

As shown in FIG. 1, the detection system 1 includes, for example, a camera 10 as an imaging unit, an LED unit 20 as a light irradiation unit, and a control board 30.

The camera 10 captures a still image or a moving image (hereinafter, simply referred to as an “image”), and is, for example, a near-infrared camera. The camera 10 is installed at a position where the face image of the driver P can be captured, and is installed on, for example, an instrument panel, a dashboard, a steering column, or the like. In the camera 10, the camera lens is arranged toward the face of the driver P, and the face image of the driver P is captured. For example, the camera 10 receives the reflected light L due to the light applied to the face of the driver P by the LED unit 20 and captures the face image of the driver P. The camera 10 is activated when the ACC (accessory) power supply or the IG (ignition) power supply of the vehicle is turned on, and captures the face image of the driver P until these power supplies are turned off. The camera 10 is connected to the control board 30 and outputs the captured facial image of the driver P to the control board 30.

The LED unit 20 irradiates light, for example, irradiates near infrared rays. The LED unit 20 is installed at a position where light can be applied to the face of the driver P. The LED unit 20 has a light source 21, an irradiation direction changing portion 22, and a unit housing 23. The light source 21 irradiates light toward the face of the driver P of the vehicle. The light source 21 includes, for example, an LED (Light Emitting Diode) 21a as a light emitting element, an LED substrate 21b, and an LED housing 21c. The LED 21a emits light and is mounted on the LED substrate 21b. The LED 21a outputs, for example, near infrared rays under the control of the LED substrate 21b. The LED substrate 21b controls the light emission of the LED 21a.

The LED housing 21c is formed in a box shape, and the LED 21a and the LED substrate 21b are assembled. The LED housing 21c holds the LED 21a in a state where the LED 21a faces the driver's seat side. The LED housing 21c is movably assembled to the unit housing 23. The LED housing 21c is assembled to the unit housing 23 so as to be rotatable along the vertical direction of the vehicle, for example. As a result, the LED unit 20 can set the irradiation direction of the LED 21a along the vertical direction of the vehicle with the LED 21a facing the driver's seat side. Further, the LED housing 21c is assembled to the unit housing 23 so as to be rotatable along the left-right direction (width direction) of the vehicle. As a result, the LED unit 20 can set the irradiation direction of the LED 21a along the width direction of the vehicle with the LED 21a facing the driver's seat side. The LED unit 20 moves within a range in which the LED 21a can irradiate the face of the driver P, and irradiates the face of the driver P in the driver's seat with light. In the initial state, the LED unit 20 irradiates light along a predetermined reference irradiation direction. This reference irradiation direction is, for example, the direction in which the faces of the driver P in the driver's seat are located on average.

The irradiation direction changing unit 22 is a mechanical moving mechanism that changes the irradiation direction of the LED 21a. The irradiation direction changing unit 22 has, for example, an LED gear 22a, a unit gear 22b, and a worm 22c. The LED gear 22a is assembled to the LED housing 21c. The unit gear 22b is assembled to the unit housing 23. The worm 22c is fitted to the LED gear 22a and the unit gear 22b. The irradiation direction changing unit 22 rotates the LED gear 22a via the worm 22c by rotationally driving the unit gear 22b, changes the vertical direction of the LED 21a, and changes the irradiation direction of the light emitted from the LED 21a up and down. To do. Further, the irradiation direction changing unit 22 has a mechanical moving mechanism (not shown), and this mechanical moving mechanism changes the direction of the LED 21a in the left-right direction and changes the irradiation direction of the light emitted from the LED 21a to the left and right. To do.

The unit housing 23 accommodates the device. The unit housing 23 is formed in a box shape and has an internal space inside. The unit housing 23 accommodates a part of the light source 21 and the irradiation direction changing portion 22 in the internal space portion. The unit housing 23 is assembled so that the LED 21a can rotate along the vertical and horizontal directions of the vehicle with the LED 21a facing the driver's seat side.

The control board 30 controls the LED unit 20. The control board 30 includes a CPU, a ROM that constitutes a storage unit, a RAM, and an electronic circuit mainly composed of a well-known microcomputer including an interface. The control board 30 includes a spectacles wearing determination unit 31, a position detection unit 32, a specific unit 33, and a control unit 34. The eyeglass wearing determination unit 31, the position detection unit 32, the specific unit 33, and the control unit 34 constitute face recognition middleware.

The spectacles wearing determination unit 31 determines whether the driver P wears the spectacles G. The spectacles wearing determination unit 31 determines the wearing of the spectacles G of the driver P by well-known image processing such as image pattern matching. The spectacles wearing determination unit 31 compares, for example, a predetermined image of the spectacles G with the face image of the driver P captured by the camera 10, and the image of the spectacles G is selected from the facial images of the driver P. Is detected. When the image of the spectacles G can be detected from the face image of the driver P, the spectacles wearing determination unit 31 determines that the driver P is wearing the spectacles G. On the other hand, when the image of the spectacles G cannot be detected from the face image of the driver P, the spectacles wearing determination unit 31 determines that the driver P is not wearing the spectacles G. The eyeglass wearing determination unit 31 is connected to the control unit 34 and outputs the determination result to the control unit 34.

The position detection unit 32 detects the position of the pupil E in both eyes of the driver P. The position detection unit 32 detects the position of the pupil E of the driver P by well-known image processing such as image pattern matching. The position detection unit 32 compares, for example, a predetermined eye image with the face image of the driver P captured by the camera 10, and selects the pupil E of the driver P from the face image of the driver P. Detect the position of. The position detection unit 32 is connected to the control unit 34 and outputs the detection result to the control unit 34. The position detection unit 32 controls, for example, a detection result indicating that the pupil E can be detected when the position of the pupil E of the driver P can be detected from the face image of the driver P. Output to unit 34. On the other hand, as shown in FIG. 2, the position detection unit 32 reflects the light emitted from the LED 21a on the lens of the spectacles G, and the reflected light L is superimposed on the pupil E to superimpose the reflected light L on the pupil E from the driver P's face image. When the position of the pupil E of P cannot be detected, the detection result indicating that the pupil E could not be detected is output to the control unit 34.

The identification unit 33 specifies the moving direction of the driver P's face. The identification unit 33 specifies the moving direction of the driver P's face based on the driver P's face image captured by the camera 10 by a well-known image process. For example, the specific unit 33 compares the face images of the driver P captured by the camera 10 in chronological order, and calculates a change in the position (angle) of the face of the driver P. The identification unit 33 specifies the moving direction of the driver P's face from the change in the position (angle) of the driver P's face. For example, when the position (angle) of the face image of the driver P changes along the left-right direction, the identification unit 33 specifies that the face of the driver P has moved along the left-right direction. Further, when the position (angle) of the face image of the driver P changes along the vertical direction, the specific unit 33 identifies that the face of the driver P has moved along the vertical direction. The specific unit 33 is connected to the control unit 34 and outputs the specified result to the control unit 34.

The control unit 34 controls the irradiation direction changing unit 22. The control unit 34 is connected to the spectacles wearing determination unit 31, and the spectacles wearing determination unit 31 outputs the determination result of wearing the spectacles G. The control unit 34 is connected to the position detection unit 32, and the detection result of the pupil E is output from the position detection unit 32. The control unit 34 controls the irradiation direction changing unit 22 based on the determination result of the eyeglass wearing determination unit 31 and the detection result of the position detection unit 32. For example, when the control unit 34 determines that the driver P is wearing the spectacles G by the spectacles wearing determination unit 31, and the position detection unit 32 can detect the position of the pupil E, the control unit 34 emits light from the LED 21a. Maintain the irradiation direction.

On the other hand, when the control unit 34 determines that the driver P is wearing the spectacles G by the spectacles wearing determination unit 31 and the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 uses the irradiation direction changing unit 22. It is controlled and the irradiation direction of the light emitted from the LED 21a is changed to a direction different from the current irradiation direction. For example, when the control unit 34 irradiates light from the LED 21a in the first irradiation direction different from the reference irradiation direction, the position detection unit 32 cannot detect the position of the pupil E (see FIG. 2), the irradiation direction changing unit 22 is controlled and the first irradiation direction is once set to the reference irradiation direction. Next, the control unit 34 sets the reference irradiation direction to a second irradiation direction different from the first irradiation direction (see FIG. 3), and irradiates light from the light source 21 along the second irradiation direction. Here, the second irradiation direction is, for example, a direction of movement from the reference irradiation direction to a direction different from the direction of movement from the first irradiation direction. Further, the second irradiation direction may be moved in the same direction as the direction of movement from the reference irradiation direction to the first irradiation direction, and may be a direction farther from the reference irradiation direction than the first irradiation direction.

Further, the control unit 34 controls the irradiation direction changing unit 22 based on the moving direction of the face of the driver P specified by the specific unit 33. For example, when the position of the pupil E cannot be detected by the position detection unit 32 and the face of the driver P moves in the specific movement direction specified by the specific unit 33, the control unit 34 uses the position detection unit 32. When the position of the pupil E can be detected, this specific moving direction is determined to be a useful moving direction and stored in a storage unit (not shown). After that, when the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 shifts the irradiation direction of the light emitted from the LED 21a in the direction opposite to the specific movement direction stored in the storage unit.

Specifically, for example, when the face of the driver P moves upward in the vertical direction, the control unit 34 can detect the position of the pupil E by the position detecting unit 32, and then the upper side in the vertical direction. Is determined to be a useful moving direction. Then, when the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 shifts the irradiation direction of the light emitted from the LED 21a to the lower side in the vertical direction, which is the opposite direction of the upper side in the vertical direction. As a result, the control unit 34 can suppress the superposition of the pupil E of the driver P and the reflected light L of the spectacles G.

In another operation example, when the position detection unit 32 can detect the position of the pupil E when the face of the driver P moves to the left side in the left-right direction, for example, the control unit 34 is in the left-right direction. The left side is judged to be a useful moving direction. Then, when the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 shifts the irradiation direction of the light emitted from the LED 21a to the right side in the left-right direction, which is the opposite direction to the left side in the left-right direction. As a result, the control unit 34 can suppress the superposition of the pupil E of the driver P and the reflected light L of the spectacles G.

Next, an operation example of the detection system 1 will be described. FIG. 4 is a flowchart showing an operation example of the detection system 1 according to the embodiment. In the detection system 1, the control unit 34 acquires the face image of the driver P from the camera 10 as shown in FIG. 4 (step S1). Next, the control unit 34 inputs the face image of the driver P into the face recognition middleware (step S2). The control unit 34 inputs the face image of the driver P to, for example, the eyeglasses wearing determination unit 31 and the position detection unit 32 that constitute the face recognition middleware.

Next, the spectacles wearing determination unit 31 determines whether or not the driver P is wearing the spectacles G (step S3). The spectacles wearing determination unit 31 determines the wearing of the spectacles G of the driver P by, for example, well-known image processing such as image pattern matching. When the control unit 34 determines that the driver P is wearing the spectacles G by the spectacles wearing determination unit 31 (step S3; Yes), the position detection unit 32 can detect the pupils E of both eyes of the driver P. It is determined whether or not it is (step S4). The position detection unit 32 detects the position of the pupil E of the driver P by, for example, a well-known image process such as image pattern matching. When the position detection unit 32 determines that the pupil E of both eyes of the driver P can be detected by the control unit 34 (step S4; Yes), the control unit 34 ends the process of detecting the pupil E. On the other hand, when the position detection unit 32 determines that the pupil E of both eyes of the driver P cannot be detected (step S4; No), the control unit 34 determines that the pupil E cannot be detected by the reflected light L (step). S5).

Then, the control unit 34 once sets the irradiation direction of irradiating the light from the LED 21a to the reference irradiation direction (step S6). The control unit 34 controls, for example, the irradiation direction changing unit 22, changes the vertical direction and the horizontal direction of the LED 21a, and changes the direction of the LED 21a, thereby temporarily irradiating the irradiation direction from the LED 21a with reference. Set in the direction. Next, the control unit 34 controls to irradiate the light in an irradiation direction different from the current irradiation direction (step S7). For example, the control unit 34 sets the irradiation direction for irradiating light from the LED 21a to a second irradiation direction different from the previous first irradiation direction from the reference irradiation direction, and emits light from the LED 21a along the second irradiation direction. Irradiate. At this time, for example, when the above-mentioned specific movement direction is stored in the storage unit, the control unit 34 first sets the second irradiation direction based on the specific movement direction. As a result, the control unit 34 can shorten the time for detecting the position of the pupil E of the driver P.

Next, the control unit 34 acquires the face image of the driver P from the camera 10 (step S8), and inputs the face image of the driver P into the face recognition middleware (step S9). Then, the control unit 34 determines whether or not the position detection unit 32 can detect the pupils E of both eyes of the driver P (step S10). When the position detection unit 32 can detect the pupils E of both eyes of the driver P (step S10; Yes), the control unit 34 ends the process. On the other hand, when the position detection unit 32 cannot detect the pupils E of both eyes of the driver P (step S10; No), the control unit 34 returns to the above-mentioned step S6 and temporarily sets the irradiation direction of irradiating the light from the LED 21a. The reference irradiation direction is set (step S6). When the control unit 34 determines in step S3 above that the driver P is not wearing the glasses G by the eyeglasses wearing determination unit 31 (step S3; No), the control unit 34 ends the process.

As described above, the detection system 1 according to the embodiment includes the LED unit 20, the camera 10, the eyeglass wearing determination unit 31, the position detection unit 32, and the control unit 34. The LED unit 20 has a light source 21 and an irradiation direction changing unit 22. The light source 21 irradiates light toward the face of the driver P of the vehicle. The irradiation direction changing unit 22 changes the irradiation direction of the light emitted from the light source 21 toward the driver P's face. The camera 10 captures an image by the reflected light L due to the light applied to the face of the driver P. The eyeglass wearing determination unit 31 determines that the driver P wears the eyeglasses G based on the image captured by the camera 10. The position detection unit 32 detects the position of the pupil E in the eyes of the driver P based on the image captured by the camera 10. The control unit 34 controls the irradiation direction changing unit 22 based on the determination result of the eyeglass wearing determination unit 31 and the detection result of the position detection unit 32. When the control unit 34 determines that the driver P is wearing the spectacles G by the spectacles wearing determination unit 31 and the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 controls the irradiation direction changing unit 22. The irradiation direction of the light emitted from the light source 21 is changed to a direction different from the current irradiation direction, and the position of the pupil E is controlled to be detected.

With this configuration, the detection system 1 can suppress the superposition of the pupil E of the driver P and the reflected light L of the spectacles G. Further, since the detection system 1 can capture the face image of the driver P while maintaining the amount of light of the LED 21a, it is not necessary to increase the number of the LEDs 21a and it is not necessary to increase the radiation intensity. As a result, since it is not necessary to install a heat exhaust device for exhausting heat in the detection system 1, it is possible to suppress an increase in the size of the system and an increase in manufacturing cost due to the installation of the heat exhaust device. As a result, the detection system 1 can properly detect the position of the pupil E of the driver P even when the driver P wears the glasses G.

In the detection system 1, the light source 21 has an LED 21a that irradiates light. The irradiation direction changing unit 22 changes the irradiation direction of the light emitted from the light source 21 by changing the direction of the LED 21a. With this configuration, the detection system 1 can suppress the superposition of the pupil E of the driver P and the reflected light L of the spectacles G.

In the detection system 1, in the initial state, the LED unit 20 irradiates light along a predetermined reference irradiation direction. When the position detection unit 32 cannot detect the position of the pupil E when the light source 21 irradiates light in the first irradiation direction different from the reference irradiation direction, the control unit 34 controls the irradiation direction changing unit 22 to perform the first irradiation. The direction is once set to the reference irradiation direction, then the reference irradiation direction is set to a second irradiation direction different from the first irradiation direction, and the light source 21 irradiates light. With this configuration, the detection system 1 can appropriately set the irradiation direction in which the light is emitted from the light source 21.

The detection system 1 includes a specific unit 33 that specifies the moving direction of the driver P's face from the position of the driver P's face specified based on the image captured by the camera 10. When the position of the pupil E cannot be detected by the position detection unit 32, the control unit 34 moves the face of the driver P in the specific movement direction specified by the specific unit 33, and the position detection unit 32 causes the pupil E to move. The position can be detected, and then, when the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 shifts the irradiation direction of the light emitted from the light source 21 in the direction opposite to the specific movement direction. With this configuration, the detection system 1 can set the irradiation direction in which the position of the pupil E is likely to be detected by the position detection unit 32 based on the specific movement direction. Therefore, the pupil E of the driver P can be set. It is possible to shorten the time for detecting the position of.

[Modification example]
Next, a modified example of the embodiment will be described. The irradiation direction changing unit 22 has described an example in which the direction of the LED 21a is changed to change the irradiation direction of the light emitted from the light source 21, but the present invention is not limited to this, and the irradiation direction of the light is changed by, for example, a reflection mirror or the like. You may try to do it.

When the position detection unit 32 cannot detect the position of the pupil E, the control unit 34 describes an example in which the first irradiation direction is once set to the reference irradiation direction, and then the reference irradiation direction is set to the second irradiation direction. However, it is not limited to this. For example, the control unit 34 may set the first irradiation direction to the second irradiation direction directly from the first irradiation direction without setting the first irradiation direction to the reference irradiation direction once.

The control unit 34 has described an example in which the irradiation direction of the light emitted from the light source 21 is shifted in the direction opposite to the specific movement direction when the position of the pupil E cannot be detected by the position detection unit 32. It is not necessary to perform the control based on.

The detection system 1 has described an example of detecting the pupil E of the driver P, but the present invention is not limited to this, and the pupil E of an occupant other than the driver P may be detected.

Although the example in which the detection target in the eyes of the driver P is the pupil E has been described, the detection target is not limited to this, and may include, for example, an iris.

Although the example in which the detection target in the eyes of the driver P is the pupil E of both eyes has been described, the detection target is not limited to this, and may be, for example, the pupil E of one eye.

Although the example in which the camera 10 is a near-infrared camera has been described, the camera 10 is not limited to this, and may be another camera.

Although the example of irradiating the LED unit 20 with near infrared rays has been described, the LED unit 20 is not limited to this, and may irradiate other light.

The spectacles wearing determination unit 31 has described an example of determining the wearing of the spectacles G of the driver P by pattern matching of images, but the present invention is not limited to this, and the spectacles wearing determination unit 31 determines the wearing of the spectacles G of the driver P by another method. You may.

The position detection unit 32 has described an example of detecting the position of the pupil E of the driver P by pattern matching of images, but the present invention is not limited to this, and the position detection unit 32 detects the position of the pupil E of the driver P by another method. May be good.

1 Detection system 10 Camera (imaging unit)
20 LED unit (light irradiation unit)
21 Light source 21a LED (light emitting element)
22 Irradiation direction changing unit 31 Glasses wearing judgment unit 32 Position detection unit 33 Specific unit 34 Control unit E Pupil (detection target)
L Reflected light P Driver (occupant)

Claims (4)

A light source that irradiates light toward the face of the occupant of the vehicle, and a light irradiation unit having an irradiation direction changing unit that changes the irradiation direction of light radiated from the light source toward the face of the occupant.
An imaging unit that captures an image by reflected light from the light radiated on the occupant's face,
A spectacles wearing determination unit that determines the wearing of the occupant's spectacles based on the image captured by the imaging unit, and
A position detection unit that detects the position of the detection target in the eyes of the occupant based on the image captured by the imaging unit, and
A control unit that controls the irradiation direction changing unit based on the determination result of the eyeglass wearing determination unit and the detection result of the position detection unit is provided.
The control unit controls the irradiation direction changing unit when the spectacles wearing determination unit determines that the occupant is wearing the spectacles and the position detection unit cannot detect the position of the detection target. A detection system characterized in that the irradiation direction of light emitted from the light source is changed to a direction different from the current irradiation direction, and the position of the detection target is controlled to be detected. The light source has a light emitting element that irradiates light.
The detection system according to claim 1, wherein the irradiation direction changing unit changes the irradiation direction of the light emitted from the light source by changing the direction of the light emitting element. In the initial state, the light irradiation unit irradiates light along a predetermined reference irradiation direction.
When the control unit irradiates light from the light source in a first irradiation direction different from the reference irradiation direction and the position of the detection target cannot be detected by the position detection unit, the control unit controls the irradiation direction changing unit. According to claim 1 or 2, the first irradiation direction is once set to the reference irradiation direction, then the reference irradiation direction is set to a second irradiation direction different from the first irradiation direction, and light is emitted from the light source. The detection system described. A specific unit for specifying the moving direction of the occupant's face from the position of the occupant's face specified based on the image captured by the imaging unit is further provided.
When the position of the detection target cannot be detected by the position detection unit, the control unit moves the occupant's face in the specific movement direction specified by the specific unit, and the position detection unit detects the target. If the position of the detection target cannot be detected by the position detection unit, then the irradiation direction of the light emitted from the light source is shifted in the direction opposite to the specific movement direction. The detection system according to any one of 3.