JP3383594B2 - Eye opening measurement device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring an eye opening (interval between upper and lower eyelids) by processing a video image of an eye.

[0002]

2. Description of the Related Art As a method for measuring the degree of opening of the human eye (the interval between the upper and lower eyelids), there is a conventional method, for example, Japanese Patent Laid-Open No. 10-44.
There is one disclosed in Japanese Patent No. 824, etc. In this method, a processing target area is determined by processing a face image, and binarization processing is performed on the area to extract an eye area. The threshold for this binarization obtains the frequency distribution regarding the density values of the pixels in the processing target area, and sets it as the density value having the maximum frequency, the center of gravity of the frequency distribution, the median value, the density value having the differential value of 0, and the like. I have decided. Then, the eye area obtained by binarization is scanned in the vertical direction, and the eye opening is measured as the maximum continuous length.

[0003]

However, in the above-mentioned conventional method, the processing target for obtaining the frequency distribution of the density values with respect to the size of the eye on the image (within about 40 pixels) is wide (120 horizontal, 60 vertical). Since it is about pixels), it is necessary to capture an image including a wide area other than the eyes. Also, 2
In order to determine the binarization threshold, it is necessary to obtain the frequency distribution of the density values from all the pixels in the processing target area, which causes a problem that the processing amount increases.

From these points, it has been desired to realize an eye opening measuring method and apparatus capable of measuring the eye opening with a small processing amount.

[0005]

The present invention adopts the following constitution in order to solve the above-mentioned problems. <Structure 1> In an eye opening measurement device that captures an image of a subject's eye and measures the opening of the eye from the obtained image, a straight line that extends vertically through a range of the width of the pupil is used as a measurement sequence. A measurement position setting unit to set, based on the change in the concentration value on the measurement row, to detect the end points of the eyelids on the measurement row, and an eye opening measurement unit that measures the interval between the eyelid end points as the eye opening. A camera for capturing an image of the subject's eye , and a light-transmissive member provided between the subject and the camera to separate the subject from the camera and to transmit the image of the subject. Eye opening measurement device.

[0006] <Configuration 2> In opening measuring apparatus of the eye according to Structure 1, so that the glare of the illumination within the range of the width of the subject's pupil is located, row intends illuminating device illuminating the eye of the subject And a measurement position setting unit that sets a measurement sequence that passes through the lighting reflection position, and an eye opening that detects the end points of the eyelids above and below the reflection position and measures the interval between the eyelid end points as the eye opening. opening measuring apparatus of the eye, characterized in that <br/> comprising a measurement unit.

[0007] <Configuration 3> In opening measuring apparatus of the eye according to Structure 2, the measurement position setting of searching location glare lighting, by searching for regions where the density value in the eye of the image becomes equal to or higher than the threshold Department
Opening measuring apparatus of the eye characterized by further comprising a.

<Structure 4> In the eye opening measuring device according to Structure 3, a measurement position setting is performed by searching for a reflection position of the illumination by searching an area within a predetermined size range. Equipped
A device for measuring the degree of eye opening .

<Structure 5> In the eye opening measuring device according to any one of Structures 1 to 4,
The eye that detects the upper and lower end points of the pupil on the measurement sequence in the eye image and the end points of the eyelids above and below the upper and lower end points of the pupil.
Eye opening measurement device characterized by having
Place

[0010] <Configuration 6> Te opening measuring apparatus odor of the eye according to Structure 5, the density values of the pixels above and below the pupil hole, of the eye to detect the end point of the eyelid by comparing the iris endpoint detection threshold Opening measurement part
Opening measuring apparatus of the eye characterized by further comprising a.

<Structure 7> In the eye opening measuring device according to Structure 6, the iris endpoint detection threshold value is obtained by adding a predetermined offset value to the maximum value of the density values obtained for the pixels around the pupil. A device for measuring the degree of eye opening .

[0012] <Configuration 8> Te opening measuring apparatus odor <br/> eye according to any of the 5-7, the eye to be detected by the vertical positional glare of illumination pupil endpoints were detected opening opening measuring apparatus of the eye characterized by further comprising a measurement unit.

<Structure 9> In the eye opening measuring device according to Structure 8, the pupil end points
The eye opening measuring device is provided with an eye opening measuring unit for detecting the density values of pixels above and below the detected reflection position of the illumination by comparing with the threshold value for pupil end point detection. .

<Structure 10> In the eye opening measuring device according to Structure 9, the pupil end point detection threshold value is obtained by adding an offset value to the minimum value of the density values obtained for the pixels around the detected illumination reflection position. An eye opening measuring device characterized by being added .

<Structure 11> In the eye opening measuring device according to any one of structures 2 to 10, the illuminating device is an infrared light illuminator. Degree measuring device.

<Constitution 12> In the eye opening measuring device according to any one of constitutions 1 to 11.
The light transmission member is a half mirror .

<Structure 13> The eye opening measuring device according to any one of structures 1 to 11, wherein the light transmitting member is a visible light cut filter .

<Constitution 14> In the eye opening measuring device according to any one of constitutions 1 to 11 , the light transmitting member is a half mirror and a visible light cut filter.
A device for measuring the degree of opening of the eye, which is a combination of two types .

<Structure 15> In the eye opening measuring device according to Structure 12 ,
In contrast, the light transmission member installed diagonally and the image of the subject's eye
An eye opening measurement device, comprising: a camera that captures an image as a reflection image by a light transmitting member .

<Structure 16> In the eye opening measuring device according to Structure 15, the light transmitting portion is provided.
Installed behind the material and tested based on the given video signal
Image display that displays the image of the eyes of the person and the image signal from the camera.
Image display, measurement position setting unit and eye opening meter.
An eye-opening measuring device comprising: an image distributor for distributing to the measuring unit.

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to specific examples.

In the present invention, the opening degree of the eye is measured by paying attention to the change of the density value in the eye image without performing the binarization processing which requires the threshold value determination processing. In addition, in order to determine the position for observing changes in density value, an illumination is installed near the camera that captures the eye image, and this illumination is reflected on the cornea when the subject faces the camera. The observation position. Then, the end points of the pupil and the upper and lower eyelids are determined by observing the change of the density value in the vertical direction from the position where the illumination is reflected. Then, the eye opening is measured as the distance between the obtained end points of the upper and lower eyelids. Since the density value is observed with respect to the pixels inside the eye, the image to be processed does not need to widely include the peripheral portion of the eye. Further, since it is not necessary to obtain the frequency distribution of the density values, the number of times the density values of the pixels are referred to is reduced, and the processing amount can be reduced.

<Specific Example 1><Structure> FIG. 1 is a flow chart showing a specific example 1 of the eye opening measuring method of the present invention. Prior to this, an eye for realizing the eye opening measuring method is shown. The opening degree measuring device will be described.

FIG. 2 is a block diagram of an eye opening measuring device. The illustrated apparatus includes a camera 1, an illuminating device 2, a light transmitting member 3, and an eye image processing device 4. The camera 1 is the subject 1
00 is a camera that is provided in the direction of gaze, captures an eye image of the subject 100, and outputs this as an image signal to the eye image processing device 4.

The illumination device 2 is a device provided near the camera 1 for illuminating the subject 100. The light transmitting member 3 is carelessly taken by the subject 100 in the camera 1
Is a protective surface provided so as not to come too close to equipment such as glass, and is made of a material such as glass that transmits light.
Is installed on the front side (between the subject 100 and the camera 1).

The eye image processing device 4 includes an eye image input unit 11,
The measurement position setting unit 12, the eye opening measurement unit 13, and the opening output unit 14 are provided.

The eye image input unit 11 is a functional unit that receives an analog image signal from the camera 1 and converts it into a digital image by A / D conversion.

The measurement position setting unit 12 includes an eye image input unit 11
Is a functional unit that searches for the reflection of the illumination reflected in the vicinity of the pupil based on the image signal of. Then, when such an illumination reflection is detected, it has a function of outputting the center position of the illumination reflection portion as a measurement position.

The eye opening measuring unit 13 sequentially detects the upper and lower end positions of the pupil above and below the measurement position, the lower end position of the upper eyelid, and the upper end position of the lower eyelid, and based on the obtained end point positions of the upper and lower eyelids. It is a functional unit that calculates the degree of eye opening. The opening degree output unit 14 is a functional unit that outputs the eye opening degree information obtained by the eye opening degree measurement unit 13.

<Operation> Next, the operation will be described. An eye image of the subject 100 is captured by the camera 1 and sent to the eye image processing device 4.

FIG. 3 is an explanatory diagram of an eye image. 2 in the figure
Reference numeral 01 denotes a pupil, and when the camera 1 and the illumination device 2 are close to each other, a reflection 202 of the illumination can be observed on the pupil. Further, 203 indicates an iris and 204 indicates a sclera.
Although not shown, upper and lower eyelashes are added to this.

Eye image input section 1 in eye image processing apparatus 4
1 receives an image signal from the camera 1 and generates digital image data by A / D conversion. The input video is converted into eye image data composed of horizontal W pixels and vertical H pixels. In the following description, I (x, y) represents the density value of the pixel at the position of the x-th column and the y-th row. However, the number of columns and the number of rows are counted based on the upper left position of the image, and the leftmost column is defined as the 0th column and the uppermost row is defined as the 0th row. Generally, the density value is represented by an integer from 0 to 255, where 0 is the darkest and 255 is the brightest.

Next, the processing from the measurement position setting unit 12 will be described with reference to FIG. The measurement position setting unit 12 sets the measurement position of the eye (step S1).

FIG. 4 is a flowchart showing the processing of the measurement position setting unit 12. First, in the eye image data,
A region where the density value exceeds a preset threshold value is searched for (step S11). The search method is as follows. First, the eye image data is scanned in a fixed procedure to search for pixels whose density value exceeds the threshold value.
Next, in the vicinity of this pixel, similarly, a pixel whose density value exceeds the threshold value is labeled, and an area having the same label is obtained. In this labeling, the same value is given to adjacent pixels in the vertical and horizontal directions.

The processing of step S11 is to detect the illumination reflection area on the eye image data. The size of the area depends on the size of the lighting device 2, the resolution of the camera 1, and the camera 1.
The approximate range can be set in advance by the distance between the subject 100 and the subject.

In this way, the range of the size of the reflection of the illumination is set in advance, and the size of the area (the maximum width and height of the area) obtained in step S11 is compared with this range. It is inspected that the area is a reflection of illumination (step S12).

If the size of the area is out of the range in step S12, the process returns to step S11 to search for the next area. In order to perform such a re-search, the measurement position setting unit 12 holds the extent to which the process of step S11 has progressed, and performs the search from this holding position when the search is restarted.

When the size judgment in step S12 is passed, the center position of the area is calculated in the next step S13. This is calculated as the center position of the circumscribed rectangle of the area. The obtained position is defined as (X, Y).

Next, the pupil is judged. When the illuminating device 2 is located directly below the camera 1 as shown in FIG. 2, the reflection of illumination is observed just below the center of the pupil in the eye image data as shown in FIG. Using this characteristic, in step S14, several sample pixels are set above the position (X, Y), and in the next step S15, whether the density value of each pixel is lower than a preset threshold value or not. Determines whether or not the detected region is a reflection of the illumination near the pupil. If it is determined that the pupil is not the pupil, the process returns to step S11 to search for the next region.

Next, the operation of the eye opening measuring section 13 will be described. The processing of the eye opening degree measurement unit 13 is performed based on the density value of the pixel in the Xth column of the eye image data. This Xth row is called a measurement row.

FIG. 5 shows the density value distribution of the pixels in the measurement column for the eye image data of FIG. The eye opening measurement unit 13 includes a lower end of the upper eyelid, an upper end of the pupil shown in FIG.
The positions of the lower edge of the pupil and the upper edge of the lower eyelid are respectively determined, and the eye opening is measured as the interval between the lower edge of the upper eyelid and the upper edge of the lower eyelid.

Returning to FIG. 1, the eye opening measuring section 13 first sets a threshold value for detecting the pupil end point (step S2).
This value is obtained by searching the minimum value of the density value in the upward direction (direction of decrease of y in FIG. 5) from the position Y in the measurement row, and adding the offset value (usually about 30 to 50) to the obtained minimum value. And The range of pixels for which the minimum is obtained is about several pixels from the position Y. Normally, the position where the density value is the minimum above the position Y is in the pupil (usually, the density value in the pupil does not almost change), and thus the pupil end point detection threshold value can be determined by such a method. . If the threshold value for pupil end point detection is extremely high, the subsequent processing is interrupted and the process returns to the next area search processing in the measurement position setting unit 12.

Next, the upper end position of the pupil is detected (step S3). In this process, first, the pixels in the measurement row are scanned above the position of the minimum density value, and the upper end position of the pupil is set as the position of the pixel before the density value exceeds the threshold value for pupil end point detection set in step S2. To detect.

Next, the lower end position of the pupil is detected (step S4). In this process, first, the minimum value of the density value is searched downward from the position Y of the measurement row, and if the value is less than or equal to the threshold value for pupil end point detection set in step S2, the pupil is located below the illumination reflection. It is determined that there is. Then, the pixels in the measurement row are scanned further downward, and the lower end position of the pupil is detected as the position of the pixel before which the density value exceeds the threshold value for pupil end point detection.

When the minimum density value exceeds the pupil end point detection threshold value, it is determined that there is no pupil under the illumination reflection. In this case, the position of the lower end of the pupil is obtained above the illumination reflection part. That is, the pixels in the measurement row are scanned upward from the position Y, and the lower end position of the pupil is detected as the position of the pixel whose density value is equal to or less than the maximum density value of the pupil.

Next, the size (diameter) of the pupil is obtained as the interval between the upper and lower end positions of the pupil detected by the processing up to the above step S4, and the size of the pupil is determined by whether or not this meets a preset condition. Is verified (step S5).

Since the size of the pupil varies depending on the illumination conditions and individual differences, the range of the size of the pupil is set in advance,
It is determined whether or not the size of the obtained pupil is within this range. If not, the process returns to the next area search process in the measurement position setting unit 12.

Next, an iris end point detection threshold value is set (step S6). It is assumed that the maximum density value is calculated downward from the lower end position of the pupil and an offset value (usually about 15) is added to the obtained maximum value. However, the range for obtaining the maximum is set in advance as the range where the iris exists. If the lower end of the pupil is found above the position Y,
Similar processing is performed below the minimum position of the density value obtained below the position Y in step S4. If this iris endpoint detection threshold is extremely high,
The descending process is interrupted, and the process returns to the next region search process in the measurement position setting unit 12.

Next, the upper end position of the lower eyelid is detected. In this process, first, the pixels in the measurement row are scanned below the range where the threshold value for detecting the iris end point is obtained, and the density value is determined to be step S6.
The upper end position of the lower eyelid is detected as the position of the pixel that exceeds the threshold for iris end point detection set in step 2.

Next, the lower end position of the upper eyelid is detected (step S8). In this process, the pixels in the measurement row are scanned upward from the upper end position of the pupil, and the lower end position of the upper eyelid is detected as the position of the pixel whose density value exceeds the threshold for iris end point detection set in step S6.

Next, the eye opening is calculated as the interval between the lower end position of the upper eyelid and the upper end position of the lower eyelid (step S).
9). Then, it is determined whether or not this value is within the preset range. If it is outside the range, the process returns to the next region search process in the measurement position setting unit 12.

The above-described processing is performed by the eye opening measurement unit 13, and the obtained eye opening is output by the opening output unit 14.

<Effect> As described above, according to the first specific example, the measurement row located within the width of the pupil is provided, and the eye opening is measured based on the density value on the measurement row. Therefore, the eye opening can be measured without obtaining the frequency distribution of the density values, so that the calculation amount can be reduced and high-speed processing can be executed. Further, since the density value is directly used without performing the binarization processing, the eye opening can be measured even if most of the eye image is occupied by the eye portion. That is, a wide range image including the eyes is not required.

In the first specific example, the light transmitting member 3 is formed of a member such as glass that transmits light.
It may be a half mirror so that you can see the eyes yourself. In addition, infrared illumination may be used for the illumination device 2 so that the subject 100 is not dazzled with the illumination. Furthermore, a visible light cut filter may be installed together with the light transmitting member 3 so as not to be affected by external light.

<Specific Example 2> In the specific example 2, the light transmitting member is installed as a half mirror obliquely with respect to the subject, and the image of the eye of the subject is photographed as a reflection image by the half mirror.

<Structure> FIG. 6 is a block diagram of an eye opening measuring device according to a second embodiment of the present invention. The apparatus shown in the figure includes a camera 1, a lighting device 2, a light transmitting member 5, and an eye image processing device 4. The light transmitting member 5 is a half mirror and is installed obliquely for the subject 100. It is configured to capture an image of the subject 100 via this half mirror.

In FIG. 6, (a) is a view seen from the lateral direction, and in this case, the light transmitting member 5 is installed downward in front of the subject 100. This half mirror may be installed upward. Further, FIG. 3B is a view seen from above, in which the light transmitting member 5 is placed in front of the subject 100,
It is installed so as to face right when viewed from the subject 100. This half mirror may be installed facing left.

6A and 6B, the camera 1 is arranged so as to capture a reflected image of the eye of the subject 100 by the light transmitting member 5. The illumination device 2 is arranged on the back side of the light transmitting member 5 (when the subject 100 is on the front side), and the subject 100 passes through the light transmitting member 5.
Is configured to illuminate.

Since the configuration of the eye image processing device 4 is the same as that of the first specific example, the description thereof is omitted here.

<Operation> In the second specific example, an image of the eye of the subject 100, which is vertically or horizontally reflected by the light transmitting member 5, is photographed and the eye opening is measured. The measurement process is performed by the eye image processing device 4, and the content of the process is the same as in the first specific example. However, the light transmitting member 5
In order to shoot the image reflected by, pay attention to the installation direction of the camera 1 so that the upper eyelid appears at the top of the image. In such a case, the eye image data is obtained by reversing left and right with respect to that of the specific example 1, but this does not affect the eye opening measurement in the specific example.

<Effect> As described above, according to the specific example 2, the light transmitting member 5 is a half mirror, and the reflection image of the eye of the subject 100 is photographed by the half mirror.
Can see the outside through a half mirror. This is effective for eye opening measurement in a situation where the field of view of the subject 100 is not obstructed, for example, when an eye image of a vehicle driver is taken.

<Specific Example 3> In the specific example 3, in addition to the configuration of the specific example 2, a monitor is provided so that the subject 100 can see the image of the eye of the subject 100.

<Structure> FIG. 7 is a block diagram of an eye opening measuring device according to the third embodiment of the present invention. The illustrated device includes a camera 1, a lighting device 2, and a light transmitting device.
Passing member 5, eye image processing device 4, video distributor 6, monitor 7
Consists of. Here, except for the video distributor 6 and the monitor 7, the configuration is the same as that of the second specific example, and therefore, corresponding parts will be denoted by the same reference numerals and description thereof will be omitted.

The image distributor 6 has a function of distributing the image captured by the camera 1 to the eye image processing device 4 and the monitor 7. The monitor 7 is a display device for displaying the image from the camera 1 distributed by the image distributor 6, and is a CR
It is composed of a T and a liquid crystal display. The monitor 7 is installed at a position where the subject 100 can see his / her own eye image through the light transmitting member 5 including a half mirror.

<Operation> The eye image of the subject 100 is reflected by the light transmitting member 5 and photographed by the camera 1 as in the second specific example. Camera 1
The video image captured in (1) is distributed to the eye image processing device 4 and the monitor 7 by the video distributor 6. This allows the monitor 7
Displays the eye image captured by the camera 1, and the subject 100
Confirms this through the light transmitting member 5. Since the operation of the eye image processing device 4 is the same as in the first and second specific examples, the description thereof is omitted here.

<Effect> According to the third specific example as described above,
Since the monitor 7 for displaying the eye image of the subject 100 captured by the camera 1 is provided, the subject 100 can confirm the image captured by the camera 1 from the monitor image. Therefore, for example, the subject 100 should be in focus.
You can adjust the position of your eyes. Therefore, the camera 1 may be a fixed focus camera and can be constructed at low cost. Since the left and right of the image displayed on the monitor are reversed, the position of the eyes in the displayed image moves in the same direction as the left and right movement of the subject 100. Therefore, the subject 100 also has the effect of easily performing eye alignment.

When the illuminating device 2 is infrared illumination, the subject 100 cannot confirm the reflected image, but by displaying the image of the camera 1 on the monitor 7 as in the third specific example, You can check your own eye image.

<Usage mode> The eye opening measuring method and apparatus of the present invention are used, for example, for detection of an awakening state caused by blinking of a vehicle driver, determination of image input to a personal identification device using eye images, and the like. be able to.

[Brief description of drawings]

FIG. 1 is a flowchart showing a specific example 1 of the eye opening measurement method of the present invention.

FIG. 2 is a configuration diagram showing a specific example 1 of an eye opening measuring device for realizing the eye opening measuring method of the present invention.

FIG. 3 is an explanatory diagram of an eye image in the eye opening measuring method of the present invention.

FIG. 4 is a flowchart showing processing of a measurement position setting unit in a specific example 1 of the eye opening measurement method of the present invention.

FIG. 5 is an explanatory diagram of a density value distribution of measurement row pixels in the specific example 1 of the eye opening measuring method of the present invention.

FIG. 6 is a configuration diagram of a specific example 2 of the eye opening measurement device of the present invention.

FIG. 7 is a configuration diagram of a specific example 3 of the eye opening measuring device of the present invention.

[Explanation of symbols]

1 Camera 2 Illumination Device 3, 5 Light Transmission Member 4 Eye Image Processing Device 7 Monitor 12 Measurement Position Setting Unit 13 Eye Openness Measurement Unit 100 Subject

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Watanabe 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) Reference JP-A-7-313459 (JP, A) JP JP-A-9-56679 (JP, A) JP-A-11-318826 (JP, A) JP-A-2-264626 (JP, A) JP-A-10-44824 (JP, A) JP-A-9-108184 (JP , A) JP 5-95908 (JP, A) JP 9-230436 (JP, A) JP 9-105853 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) A61B 3/00-3/16

Claims (16)

(57) [Claims] 1. An eye opening measuring device for taking an image of a subject's eye and measuring the degree of opening of the eye from the obtained image, wherein a straight line extending vertically through a range of the width of a pupil is measured. Based on the change of the concentration value on the measurement row and the measurement position setting unit, the end point of the eyelid on the measurement row is detected, and the eye opening that measures the interval between the end points of the eyelid as the eye opening. a degree measurement unit, a camera for capturing an image of the eye of the subject, provided between said subject camera, the subject
And a light transmission member that separates the camera from the camera and transmits an image of the subject, the eye opening measurement device. 2. The eye opening measuring device according to claim 1, wherein the illumination device illuminates the subject's eye so that the reflection of the illumination is located within the width of the pupil of the subject. A measurement position setting unit that sets a measurement sequence that passes through the reflection position of the illumination, detects the end points of the eyelids above and below the reflection position, and measures the interval between the end points of the eyelids as the eye opening. An eye opening measuring device comprising an opening measuring unit. 3. The eye position measuring device according to claim 2, wherein the position where the illumination is reflected is searched by searching a region where the density value in the eye image is equal to or more than a threshold value. An eye opening measuring device comprising: 4. The eye position measuring device according to claim 3, wherein the measurement position setting unit performs the search for the reflection position of the illumination by searching an area within a range of a predetermined size. An eye opening measuring device comprising: 5. The eye opening measuring device according to any one of claims 1 to 4, wherein upper and lower end points of a pupil on a measurement row are detected in an eye image,
An eye-opening measuring device comprising an eye-opening measuring unit that detects eyelid end points above and below the upper and lower end points of the pupil. 6. The eye opening measurement apparatus according to claim 5, wherein the eye opening detection is performed by comparing the density values of pixels above and below the pupil with an iris endpoint detection threshold value. A device for measuring the degree of opening of an eye, which is provided with a section. 7. The opening apparatus for measuring eye according to claim 6, iris endpoint detection threshold plus the offset value set in advance to the maximum value of the density values obtained for pixels near the pupil An eye opening measuring device characterized by being present. 8. The eye opening measuring device according to any one of claims 5 to 7, further comprising an eye opening measuring section for detecting the pupil end point above and below a detected illumination reflection position. A device for measuring the degree of eye opening. 9. The eye opening measuring device according to claim 8, wherein the pupil end points are detected by comparing the density values of pixels above and below the detected illumination reflection position with a threshold value for pupil end point detection. An eye opening measuring device comprising: an eye opening measuring unit. 10. The eye opening measuring device according to claim 9, wherein the pupil end point detection threshold value is obtained by adding an offset value to the minimum value of the density values obtained for pixels around the detected reflection position of the illumination. A device for measuring the degree of eye opening, which is characterized in that 11. The eye opening measuring device according to any one of claims 2 to 10, wherein the illumination device is infrared light illumination. 12. The eye opening measuring device according to any one of claims 1 to 11, wherein the light transmitting member is a half mirror. 13. The eye opening measuring device according to any one of claims 1 to 11, wherein the light transmitting member is a visible light cut filter. 14. The eye opening measuring device according to claim 1, wherein the light transmitting member is a combination of a half mirror and a visible light cut filter. . 15. The eye opening measuring device according to claim 12, wherein a light transmission member obliquely installed with respect to the subject, and a camera for photographing an image of the eye of the subject as a reflection image by the light transmission member. An eye opening measuring device comprising: 16. The eye opening measuring device according to claim 15, wherein the eye opening measuring device is installed behind the light transmitting member and is based on a given video signal.
Then, the image display for displaying the image of the subject's eyes and the image signal of the camera are set for the image display and the measurement position.
And an image distributor for distributing the eye opening measuring unit to the eye opening measuring unit.