JPH0868630A - Vehicle gaze direction measuring device and image input device used therefor - Google Patents

Abstract

(57) [Summary] [Purpose] A simple configuration follows the movement of the driver's head to efficiently obtain the line-of-sight direction. [Structure] The image input unit 50 includes the lights 1 and 2 and the driver D.
It has a wide-angle optical system that captures a wide range of facial images and a narrow-angle optical system that magnifies and captures the eyeball. Both optical systems are coaxial with the illumination 1, and the incident light is guided by the optical path branching unit 52 to the image pickup devices 5.
Divide into 1A and 51B. Wide-angle optical system image sensor 51A
The retinal reflection image is extracted by the pupil extraction unit 5A from the output of 1. and the rotation direction and rotation amount of the image input unit are calculated by the image input unit rotation amount calculation unit 6 so that the eyeball is positioned in the center of the observation visual field from this extraction result. To do. Based on this, the image input section driving actuators 7V and 7H change the image pickup direction of the image input section. Then, using the output of the image sensor 51B of the narrow-angle optical system, each reflection image position for calculating the line-of-sight direction is obtained through the pupil extraction unit 5B and the cornea reflection image extraction unit 8. The image captured by the narrow-angle optics always shows the driver's pupil, which makes extraction easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual line direction measuring device for a vehicle for remotely measuring the visual line direction of a vehicle driver without contact.

[0002]

2. Description of the Related Art Such a line-of-sight direction measuring device is used as a non-contact human machine interface for a vehicle, for example, to display visual information in the direction in which a vehicle driver is paying attention, or to display radio information in accordance with the line-of-sight direction. It is expected to be used for various purposes such as a line-of-sight switch that operates a specific switch of an in-vehicle device such as an air conditioner. As a device for measuring the line-of-sight direction of a vehicle driver, which is necessary to configure such an interface, a device for measuring the position of a corneal reflection image of an eyeball as image information has been conventionally proposed. The corneal reflection image is an image generated by the irradiation light to the eyeball being reflected and refracted by each surface of the optical system forming the eyeball, and is also called a Purkinje image.

By the way, since the driver's head position is constantly moving during driving, it is necessary to measure the line of sight of the driver while following it. As such a follow-up type gaze direction measuring device, a method using two cameras has been proposed (Beno et al., “Putting eye gaze detection device and prototype of gaze detection device allowing movement of head”). IEICE Transactions, V
ol. J76-D-2 No. 3 pp. 636-64
6, March 1993). This is to measure the line-of-sight direction while controlling the camera direction so that the position of the driver's eyeball is always captured in the center of the visual fields of both cameras.

[0004]

However, in such a conventional tracking type eye-gaze measuring device, since two independent cameras are used, both cameras must control their directions independently. I won't. Therefore, the entire configuration becomes complicated, and the images obtained by the two cameras must be subjected to the same processing in order to extract the feature points, which causes a problem of low efficiency. Therefore, in view of the above-mentioned conventional problems, the present invention is a driver's gaze direction measuring device for realizing a vehicle interface device that performs control by the driver's gaze, and a driver's head that is a measurement target is large. It is an object of the present invention to provide a visual line direction measuring device for a vehicle, which has a simple configuration and can efficiently follow the visual line direction even when moving, and can measure the visual line direction quickly and accurately.

[0005]

Therefore, the vehicle gaze direction measuring device according to claim 1 illuminates the face of the vehicle driver with a plurality of light sources spatially arranged at mutually different positions, and The image input unit for obtaining the image data by capturing the reflection image in the eyeball part of the eye, and the reflection image extraction means for extracting the retina reflection image and the corneal reflection image from the image data are provided, and from each position of the retina reflection image and the corneal reflection image. In a gaze direction measuring device for a vehicle for calculating a gaze direction of a driver, an image input section includes a wide-angle optical system which is arranged coaxially with each other and widely captures a facial image of the driver, and an eyeball section of the driver. In addition to the narrow-angle optical system that magnifies and captures the image, it also has a direction-changing unit that can change the imaging direction, and the image data obtained by the wide-angle optical system causes the eyeball to be positioned at the center of the image field. Controls the direction of the input section The reflection image extraction means has a control means for extracting the retinal reflection image and the corneal reflection image based on the image data obtained by the narrow-angle optical system after the eyeball portion is located in the center of the image visual field. I decided to do it.

According to a sixth aspect of the present invention, a plurality of light sources arranged spatially at mutually different positions, and a plurality of light sources which are coaxial with one of the plurality of light sources, each of which includes an image pickup device, are provided, and a facial image of a driver is included. An image input device for a line-of-sight direction measuring device for a vehicle, which is provided with a wide-angle optical system that captures a wide angle and a narrow-angle optical system that magnifies and captures a driver's eyeball.

[0007]

The image input unit is provided with the coaxial wide-angle optical system and the narrow-angle optical system, and the control means changes the direction changing means so that the eyeball portion based on the image data obtained by the wide-angle optical system is located in the center of the image visual field. The orientation of the image input unit is controlled and changed. As a result, the imaging directions of the wide-angle optical system and the narrow-angle optical system are changed at the same time. As a result, even if the driver's head moves greatly, the image input unit follows it. In this way, the reflection image extracting means extracts the retina reflection image and the cornea reflection image based on the image data obtained by the narrow-angle optical system in the state of being directed to the eyeball part. At this time, the retinal reflection image is always observed in the center of the image,
The extraction process becomes very simple. The line-of-sight direction of the driver is calculated based on the positions of these reflection images.

At least the wide-angle optical system of the image input unit includes an image pickup device formed in a vertical and horizontal matrix, and the direction changing means is independently rotatable about a rotation axis parallel to each vertical and horizontal sides of the image pickup device. You can At this time, it is preferable that the rotation axis of the direction changing means passes through the focal position of the narrow-angle optical system because the movement amount of the eyeball position with respect to the rotation amount of the image input unit can be described by a simple function.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1, FIG. 2 and FIG. 3 show an embodiment in which the present invention is applied to an interface system in which a switch, which is HUD-displayed on a front window of an automobile, is operated by a driver's gaze. In particular, FIG. 1 shows the configuration of the gaze direction measuring function part, and FIG. 2 shows the configuration of the switch control function part using the measured gaze direction. Moreover, FIG. 3 is the vehicle-mounted layout.

First, the outline of the gaze direction measuring function portion will be described with reference to FIG. The image input unit 5 for inputting an image of the driver's D face area on the instrument panel near the steering wheel 42.
0 is set. The eyeball position of the vehicle driver is, for example, JI
As shown in S (Japanese Industrial Standard) D0021, the image pickup unit 50 can limit the image pickup range of the vehicle driver because it exists in a limited area statistically shown as the eye range of the driver of the vehicle. Can be installed relatively close to.

The image input unit 50 includes two image pickup devices 51A and 51B arranged in a coaxial system, each of which is composed of a CCD or the like.
Is provided. In front of the two image pickup devices, an optical path branching unit 52 composed of a half mirror, a beam splitter, etc. for splitting the incident light in the directions of these two image pickup devices 51A and 51B is provided and divided. One image sensor 5
A relay lens 53 is installed on the optical path toward 1A. In addition, a coaxial system with two image sensors is formed to provide illumination 1.
And the illumination 2 is installed at a position where the relative relationship with the illumination 1 is known. Illumination 1 and illumination 2 are infrared L
The EDs and the like have the same specifications and irradiate invisible light.

Here, the optical system formed by including the image pickup device 51A and the relay lens 53 is a wide-angle optical system for observing a wide field of view, and the optical system formed by including the other image pickup device 51B has a narrow field of view. It is set to observe. The illumination angles of the illuminations 1 and 2 are set to be equal to or larger than the angle of view of the wide-angle optical system in the image input section 50. The image input unit 50 configured as described above includes the image pickup devices 51A and 51A.
It has a rotation mechanism (not shown) rotatable about each axis of the vertical side and the horizontal side of B. It should be noted that it is desirable that the rotation axes of the image input unit 50 are set at the focal position of the narrow-angle optical system including the image pickup device 51B for both axes. As a result, the movement amount of the eyeball position with respect to the rotation amount of the image input unit 50 becomes tan.
It can be described by a simple function such as proportional to (rotation angle).

The output of the image pickup device 51A is the A / D converter 4A.
After being A / D converted by, the image is sent to the pupil extraction unit 5A, where the retina reflection image is extracted. The image input unit rotation amount calculation unit 6 calculates the rotation direction and the rotation amount of the image input unit 50 based on the extraction result so that the eyeball of the driver D can be captured in the center of the observation visual field of the image input unit 50. To do. The image input unit rotation amount calculation unit 6 is connected to an image input unit drive actuator and 7V and 7H. The actuator 7V rotates the image input unit 50 around an axis parallel to the vertical axis of the image sensor, and the actuator 7H rotates the image input unit 50 around an axis parallel to the horizontal axis of the image sensor. The image input section driving actuators 7V and 7H are respectively driven according to the calculated rotation direction and rotation amount, and the imaging direction of the image input section 50 is controlled to a predetermined direction. The image input section driving actuators 7V and 7H and the above-mentioned rotating mechanism constitute the direction changing means of the invention.

An A / D converter 4B is connected to the image pickup device 51B, and after the rotation control of the image input section 50 is completed, its output is A / D converted and sent to the pupil extraction section 5B. Has become. The pupil extraction unit 5B extracts the retina reflection image, and the cornea reflection image extraction unit 8 extracts the corneal reflection image. A line-of-sight direction calculation unit 10 is provided connected to the corneal reflection image extraction unit 8 and the image input unit rotation amount calculation unit 6, where the detection positions of the retina reflection image and the corneal reflection image, and the image input unit. The line-of-sight direction of the driver D is calculated from the imaging direction of the image input unit 50 based on the calculation result of the rotation amount calculation unit 6. It is to be noted that turning on / off of the illumination 1 and the illumination 2 is controlled by the illumination light emission control unit 11, and the illumination light emission control unit 11,
Overall control including the A / D converters 4A and 4B is performed by the overall control unit 12.

Next, the switch control function portion will be described with reference to FIG. In FIG. 2, the line-of-sight direction measuring function portion described with reference to FIG. A main switch 21 is connected to the overall control unit 12, and by pressing this switch, the entire system starts operating. Line-of-sight calculation unit 10
The line-of-sight direction information calculated in step 3 is analyzed by the line-of-sight stop determination unit 23, and the switch display area 2 is HUD-displayed on the windshield 41 as illustrated in FIG.
It is determined where the user is looking at 6 and whether the user is gazing for a predetermined time. In the switch display area 26, as shown in (b) of the figure, a button display having switch names corresponding to respective control targets described later is displayed.

Based on the result of this judgment, the HUD display control unit 24 switches the HUD display, and the controller switching unit 27 is driven to drive the air conditioner controller 2
8, CD controller 29, radio controller 30,
Headlight controller 31, wiper controller 3
A predetermined controller is selected from control objects such as 2 and switching to the control mode is performed. Detailed control of each control target is performed by the steering switch 22.

As shown in FIG. 3 (a), the main switch 21 and the steering switch 22 are installed on the steering 42, and the image input section 50 is arranged substantially in the center of the instrument panel below the windshield. . Further, the steering switch 22 includes an up / down button 22A used for adjusting the set temperature of the air conditioner up and down, as shown in FIG.

Next, the flow of processing in the gaze direction measuring function portion will be described in detail with reference to FIGS. First, the control is started by pushing the main switch 21 provided on the steering wheel. And step 10
1, the illumination 1 is turned on by the control signal of the illumination light emission control unit 11. The illumination 2 remains off. In step 102, a face image of the driver D by the illumination 1 is captured by the image pickup device 51A of the image input unit 50 and A / D converted by the A / D converter 4A. This image data is I1
Let (x, y). In step 103, the control signal from the illumination light emission control unit 11 turns off the illumination 1 and turns on the illumination 2 this time. Then, in step 104, the face image is captured by the image pickup device 51A of the image input unit 50 and is A / D converted by the A / D converter 4A. This image data is I2 (x, y).

Thereafter, the pupil extraction unit 5 extracts the retina reflection image in the image data I1 (x, y) by image processing. That is, in step 105, the image data I
I2 (x, y) is subtracted from 1 (x, y) to generate image data I3 (x, y).
(X, y) is binarized with a fixed threshold Th1 to generate a binary image I4 (x, y). Next step 107
Then, the labeling process is performed on the image data I4 (x, y) to number the regions.

Then, in steps 108 and 109, selection is performed according to the area and shape of the region. This is because, in addition to the retina reflection image, various noises are included in the labeled image, such as a spectacle lens reflection image, a spectacle frame reflection image, and a part of the face caused by a change in external illumination. there is a possibility. Since these noises generally have an indefinite shape and an indefinite area, a retinal reflection image observed as a circle or an ellipse having a previously predicted area is distinguished from these noises.

First, in step 108, the area Si of each region obtained as a result of labeling is compared with preset threshold values S1 and S2 (S1 <S2), and S1 <Si <
Only the area that satisfies S2 is extracted. Where S1 and S2
May be set to an expected pupil diameter value estimated from the photographing magnification of the camera (area represented by the number of pixels corresponding to a pupil having a diameter of 2 to 8 mm). Although the spectacle lens reflection image is also observed as a circular area, for example, by narrowing the diaphragm of the lens, the area of the spectacle lens reflection image is always smaller than the area of the retinal reflection image, depending on the area, Both can be distinguished.

In step 109, the ratio F of the area of the circumscribed rectangle to the area remaining as a result of the selection based on the area is calculated. Since the retina reflection image is observed as a circle or an ellipse, the ratio F is equal to or greater than a certain fixed value Fth, whereas, for example, the spectacle frame reflection is an elongated area along the frame, and is therefore equivalent to the retinal reflection image. Even if it has the area of, it can be identified because F becomes small. In this way, the area that remains after being sorted is used as a retina reflection image,
At step 110, the position of the center of gravity (xg1, yg
Find 1).

Then, the image input unit rotation amount calculation unit 6 calculates the rotation direction and the rotation amount of the image input unit 50 necessary for capturing the extracted retina reflection image at the center of the screen. First, in step 111, the deviation of the barycentric position (xg1, yg1) of the retina reflection image from the center of the screen is obtained as the horizontal direction α and the vertical direction β. And step 112
Then, the image input unit 5
A rotation amount of 0 is obtained. If the relationship between the rotation angle of the image input unit 50 and the deviation of the retina reflection image is registered in the LUT (look-up table) in advance, the rotation direction and the rotation amount with respect to α and β can be easily calculated.

In step 113, the image input unit 50 is rotated by the rotation direction and the rotation amount signal determined by the image input unit rotation amount calculation unit 6. That is, the image input unit driving actuator 7V rotates the image input unit 50 in the direction to set the deviation α to 0, and the image input unit driving actuator 7H moves to the direction to set the deviation β to 0.
Rotate 0.

Next, at step 114, the illumination 1 is turned on again by the control signal from the illumination light emission control section 11, and the illumination 2 is turned on.
Is turned off. Then, in step 115, the image signal is taken in from the image pickup device 51B of the image input section 50 this time, and is A / D converted by the A / D converter 4B. This image is designated as I5 (x, y). In step 116, the illumination 1 is turned off and the illumination 2 is turned on. And step 117
Then, the image signal is input from the image pickup element 51B and is A / D converted by the A / D converter 4B. This image is I6 (x, y)
And

Thereafter, in step 118, the pupil extraction unit 5
In B, image data I5 (x, y) to I6 (x, y
y) is subtracted to generate image data I7 (x, y),
In step 119, the image data I7 (x, y) is binarized with the fixed threshold Th1 to generate a binary image I8 (x, y). Then, in step 120, the position of the retina reflection image (pupil) is obtained. Here, the image sensor 51A
Since the image pickup device 51B and the image pickup device 51B are installed in the coaxial system, the image I8 (x, y) obtained after the image input unit 50 is rotationally controlled.
At that time, the retina reflection image will be observed in the center.
Therefore, the center of gravity (xg2, yg2) of the region observed on the image I8 (x, y) is calculated, and this is determined as the pupil position.

In step 121, the corneal reflection image extraction unit 8
In, the corneal reflection image observed by the image sensor 51B when the illumination 1 is turned on and the corneal reflection image observed by the image sensor 51B when the illumination 2 is turned on are extracted. That is, the difference I5 (x, y) -I6 (x, y) of the image data is obtained, and the pixel having the maximum luminance gradation value is obtained. The obtained pixel (xp1, yp1) is a corneal reflection image by the illumination 1. Next, the difference I6 (x, y) -I5 (x, y)
Then, the pixel having the maximum luminance gradation value is obtained. The obtained pixel (xp2, yp2) becomes a cornea reflection image by the illumination 2.

Finally, at step 122, the line-of-sight direction calculation unit 10 calculates the line-of-sight direction of the driver D from the three reflection image positions extracted above. The line-of-sight direction is calculated by the positional relationship between the three reflected images, the relative relationship between the installation positions of the two lights, the optical parameters (focal length, light-receiving element size) of the optical system including the image sensor 51B, the image input unit rotation amount calculation unit. 6
The direction of the image input unit 50 calculated in step 1 and the average size of the eyeball (corneal sphere radius 7.8 mm, distance between corneal sphere center and pupil center 4.2 mm).

That is, as shown in FIG. 6, the illumination 1
Corneal reflection image R1 (xp1, yp1) and image sensor 51B
The focal point F of the optical system including and the center O of the corneal sphere exist on the straight line L. Illumination 2 and its corneal reflection image R2 (xp2, yp
2) the specular reflection point Q on the corneal surface by the illumination 2
The line segment connecting the lines and the bisector of the angle formed by the line segment connecting the corneal reflection image R2 and the focal point T intersect the straight line L at the point O, and the distance between Q and O is 7.8 mm. As shown in FIG. 7, a spherical surface with a radius of 4.2 mm centered on the corneal sphere center O and an image I8 (x,
Of the intersections of the straight line L1 connecting the center of gravity of the retina reflection image of y) and the focus T, the point closer to the focus T is the pupil center P. The half line OP satisfying the above conditions gives the driver's line-of-sight direction. The above steps 105 to 112 constitute a control means for controlling the direction changing means of the invention, and steps 118 to 118
121 constitutes a reflection image extraction means.

Next, the switch control function portion will be described. In the line-of-sight stop determination unit 23, the line-of-sight direction of the driver calculated by the line-of-sight direction calculation unit 10 is the switch display area 2
6. Determine where you are looking. Here, the gaze state is determined by whether or not the same area is continuously viewed a certain number of times. If it takes 400 msec to calculate the line-of-sight direction, it is assumed that the same area is being gazed at, for example, twice consecutively, that is, the same line-of-sight direction continues for about 0.8 sec.

When the line-of-sight stop determination unit 23 determines that the operator is paying attention to, for example, the air conditioner unit (A / C) in the switch display area 26, the current air conditioner setting is set in the HUD display area 25 as shown in FIG. The temperature is displayed. When the air conditioner set temperature is displayed in HUD, the up / down button 22A of the steering switch functions to adjust the set temperature up and down. The driver operates the up / down button to set a predetermined set temperature while observing the HUD display. If the up / down button 22A is not operated for a fixed time (for example, 5 seconds), it is determined that the operation is completed, and the switch control functions are all stopped. Also,
When some operation needs to be performed again, the main switch 21 is pressed to restart the above operation.

The present embodiment is configured as described above, and in the vehicle gaze direction measuring device for imaging the driver's eyeball and measuring the gaze direction in a non-contact manner, the wide-angle optics for observing a wide field of view are provided with respective image pickup elements. The image input unit 50 is configured by coaxially integrating the system and an optical system for observing a narrow field of view, and the imaging direction of the image input unit is controlled according to the eyeball position captured by the wide-angle optical system to center the observation field of view. Position the driver's eyes and
Since an image is input from the narrow-field optical system and the pupil and corneal reflection image required for calculating the line-of-sight direction are obtained from the image data, only one image input unit is rotated even if the driver's head movement is large. Then, the pupil is always reflected in the image captured by the narrow-angle optical system, and the extraction process is easy.

In addition, the line-of-sight direction is easily tracked and the line-of-sight switch is used as the vehicle interface to reliably perform the control operation intended by the driver. To live
Effective in improving preventive safety. Although the embodiment has been described as being applied to a so-called line-of-sight switch, the present invention is not limited to this, and can be applied to driver's awakening state detection and various other applications.

[0034]

As described above, according to the present invention, in the vehicular gaze direction measuring device for determining the gaze direction of the driver from the position of the reflected image in the eyeball portion illuminated by a plurality of light sources, the image input unit is a coaxial system. Equipped with a wide-angle optical system and a narrow-angle optical system, the imaging direction of the image input unit was changed so that the eyeball part based on the image data obtained by the wide-angle optical system was located in the center of the image field, and then obtained with the narrow-angle optical system. Since the retinal reflection image and the corneal reflection image are extracted based on the image data, even if the driver's head moves greatly, it is possible to easily follow this by changing the direction of one image input unit, The image captured by the narrow-angle optical system always shows the pupil, and the extraction process is easy. Therefore, there is an effect that the configuration is simple without the need to control two independent cameras independently as in the conventional case. In addition, quick line-of-sight direction calculation is performed without the low efficiency of performing the same image processing on the outputs of the two cameras for feature point extraction.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a gaze direction measuring function portion in an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a switch control function portion in the embodiment.

FIG. 3 is a diagram showing an in-vehicle layout of the embodiment.

FIG. 4 is a flowchart showing a flow of processing in a gaze direction measuring function portion of the embodiment.

FIG. 5 is a flowchart showing a flow of processing in a gaze direction measuring function portion of the embodiment.

FIG. 6 is an explanatory diagram of corneal reflection image generation.

FIG. 7 is a diagram showing a modeled eyeball configuration.

FIG. 8 is a diagram showing a HUD display example.

[Explanation of symbols]

 1, 2 Illumination 4A, 4B A / D converter 5A, 5B Pupil extraction unit 6 Image input unit Rotation amount calculation unit 7V, 7H Image input unit drive actuator 8 Corneal reflection image extraction unit 10 Eye direction calculation unit 11 Illumination emission control Part 12 Overall control part 21 Main switch 22 Steering switch 22A Up / down button 23 Line-of-sight stop determination part 24 HUD display control part 25 HUD display area 26 Switch display area 27 Controller switching part 28 Air conditioner controller 29 CD controller 30 Radio controller 31 Headlight controller 32 wiper controller 41 windshield 42 steering 50 image input unit 51A, 51B image pickup device 52 optical path branching unit 53 relay lens

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G06T 1/00

Claims (7)

[Claims] 1. An image input unit for illuminating the face of a vehicle driver with a plurality of light sources arranged spatially at mutually different positions and capturing a reflected image of a driver's eyeball portion to obtain image data, and an image. In the vehicle gaze direction measuring device, which is provided with a reflection image extracting means for extracting a retinal reflection image and a corneal reflection image from data, and calculates a driver's gaze direction from each position of the retinal reflection image and the corneal reflection image, the image input unit Is equipped with a wide-angle optical system for widely capturing the driver's facial image and a narrow-angle optical system for enlarging and capturing the driver's eyeball, which are arranged coaxially with each other. The changeable direction changing means is provided, and the control means controls the direction changing means of the image input section so that the eyeball portion based on the image data obtained by the wide-angle optical system is located at the center of the image field of view. Image extraction means, the eyeball part is in front A visual line direction measuring device for a vehicle, characterized in that the retinal reflection image and the corneal reflection image are extracted based on the image data obtained by the narrow-angle optical system after being positioned at the center of the image visual field. 2. At least the wide-angle optical system of the image input unit includes an image sensor formed in a vertical and horizontal matrix, and the direction changing means is independently provided around a rotation axis parallel to each vertical and horizontal sides of the image sensor. The visual line direction measuring device for a vehicle according to claim 1, wherein the device is rotatable. 3. The control means calculates a rotation direction and a rotation amount of the image input section according to an eyeball position formed on an image sensor of the wide-angle optical system. The visual line direction measuring device for a vehicle according to claim 2. 4. The vehicle gaze direction measuring device according to claim 2, wherein the rotation axis of the direction varying means passes through a focal position of the narrow-angle optical system. 5. The control unit calculates the rotation direction and the rotation amount of the image input unit based on the deviation of the eyeball position formed on the image sensor of the wide-angle optical system from the image specific point. The gaze direction measuring device for a vehicle according to claim 3, wherein 6. Wide-angle optics for spatially capturing a driver's facial image, including a plurality of light sources spatially arranged at mutually different positions, and an image pickup element coaxial with one of the plurality of light sources. An image input device for a gaze direction measuring device for a vehicle, comprising a narrow-angle optical system for enlarging and capturing the system and a driver's eyeball. 7. The wide-angle optical system and the narrow-angle optical system are separated by an optical path branching portion, and at least one of the optical systems is provided with a relay lens so as to have different field angles. An image input device for the vehicle gaze direction measuring device according to claim 1.