JP2004298290A - Three-dimensional observation state measuring device and method - Google Patents

Abstract

An object of the present invention is to provide a three-dimensional observation state measuring device capable of accurately measuring an eye fatigue state by measuring a three-dimensional observation state of an eye when a viewer observes a natural three-dimensional object.
An image acquisition unit (20) for acquiring a stereo image including a line-of-sight direction, and coordinate acquisition for acquiring three-dimensional coordinate values of the observation target (10) in the line-of-sight direction based on the stereo image obtained by the image acquisition unit (20). A gaze direction detection unit 30 that detects the gaze direction of the eye 14 to be examined, a gaze point measurement unit 32 that determines a gaze point position of the subject eye 14 from the gaze detected by the gaze direction detection unit 30, A coordinate comparing unit 40 is provided for comparing the gazing point position obtained by the gazing point position measuring unit 32 with the gazing point coordinate value of the observation target 10 in the line of sight at the time when the gazing point position is obtained.
[Selection diagram] Fig. 1

Description

[0001]
[Industrial applications]
The present invention relates to a three-dimensional observation state measuring apparatus and method for measuring a visual state of a viewer who views a three-dimensional observation target, for example.
[0002]
[Prior art]
The present applicant manufactures and sells various devices as eye characteristic measuring devices. For example, as disclosed in Patent Document 1, an eye refractive power measuring device is provided to facilitate eyesight measurement of an eye to be examined. Further, as disclosed in Patent Document 2, a gaze monitoring device is provided to facilitate inspection of an eye to be inspected with a perimeter or a fundus camera.
[0003]
[Patent Document 1]
Fig. 1 [Patent Document 2]
Fig. 2 of Japanese Patent Publication No. 1-52012
Here, the measurement procedure when prescribing new glasses will be described as follows.
{Circle around (1)} When spectacles are required due to a change in refraction (depending on age, etc.) of the subject, objective optometry is performed using an auto-refractometer or the like, and the approximate spherical degree, astigmatism degree, and astigmatic axis are measured.
{Circle around (2)} In parallel with the objective optometry, a subjective optometry is performed by a lens exchange method using a horopter or the like, and the accurate sphericity, astigmatism, and astigmatic axis are measured. Here, the subjective optometry is a method in which a subject sees a predetermined target and sees if the subject is clearly visible. Also, since there is an error in the subjective optometry, it is checked whether the value does not largely contradict the value of the objective test in (1).
[0005]
(3) Although the tests (1) and (2) above were performed with one eye, the next step was to make glasses with new corrective characteristics and see if they were comfortable for the subject. Is inspected with both eyes. In other words, put the lens of the measured specifications in the hanging frame, the subject wears it for about 30 minutes, checks the appearance, the degree of hanging, and if the subject feels that the wearing state is good, The eyeglasses for the subject will be made with the correction characteristics.
{Circle around (4)} Further, it is desirable that the wearing state check using the glasses thus made is performed in the same manner as in (3).
[0006]
[Problems to be solved by the invention]
However, since the examination in the wearing state of (3) is a subjective examination, there is a problem that it is not easy to give a reliable answer, particularly when the subject is a child. In other words, some children are shy and do not want to file an appeal with the inspector, so even if the correction has not been performed properly, they will accept the corrected state of the new corrected glasses. Would. Then, since the glasses are not properly corrected, there is a problem that the child cannot see the target object satisfactorily even though the child renews the glasses.
[0007]
More specifically, new eyeglasses often have changed sphericity, astigmatism, and astigmatism axis as compared to conventional eyeglasses. For example, when the sphericity is changed, it is highly possible that the astigmatic degree and the astigmatic axis are also changed. Here, a brief explanation of what the human visual system is doing when looking at a place from a distance is described.
Changes that can be seen when looking from a distance to a near point include accommodation and congestion. Assuming that convergence is dominant in binocular vision, a case where an object closer to convergence, for example, an object at a distance of 50 cm, that is, an object at a distance of 2D (diopter) is first viewed. The convergence then predicts the position of this object fairly accurately and changes the convergence angle to 2D. The adjustment sends a signal that changes the refractive power of the lens to adjust to 2D according to the convergence adjustment response.
[0008]
Here, the effect of changing the spectacles will be considered. As an example, it is assumed that glasses that are 1D stronger than conventional glasses are worn as new glasses. Then, if the refractive power of the crystalline lens is adjusted so as to look at the 2D position in the convergence adjustment response, the new eyeglass wearing adjusts the focus to the 3D position. However, such inappropriate adjustment is generally eliminated if a new spectacle adjustment program is obtained if new glasses are worn for a while. Therefore, the ability to properly adjust the refractive power of the crystalline lens with the conventional eyeglasses has become proficient so that the new eyeglasses can be used, and the subject should be able to comfortably see the object with the new eyeglasses .
[0009]
However, in actual clinical settings, new glasses may not fit the subject satisfactorily for some reason, and the subject may complain of eye fatigue. However, since it is difficult to acquire a new program for adjusting convergence for new glasses, there has been a problem that a device for objectively examining eye fatigue has not existed.
[0010]
[Problems to be solved by the invention]
The present invention has solved the above-mentioned problem. A first object is to measure a three-dimensional observation state of an eye when a viewer observes a natural three-dimensional object, so that an eye fatigue state can be accurately determined. It is an object of the present invention to provide a three-dimensional observation state measuring device and method which can be inspected at a high speed. A second object of the present invention is to provide a three-dimensional observation state in which, when a viewer observes a natural three-dimensional object, eye characteristics such as refractive power, convergence, and pupil diameter of the viewer's eye can be easily measured. It is to provide a measuring device and a method.
[0011]
[Means for Solving the Problems]
The three-dimensional observation state measurement device of the present invention that achieves the above object includes, for example, as shown in FIG. 1, an image acquisition unit 20 that acquires a stereo image including a line-of-sight direction, and a stereo image acquired by the image acquisition unit 20. A coordinate acquisition unit 22 that acquires a three-dimensional coordinate value of the observation target object 10 in the gaze direction, a gaze direction detection unit 30 that detects a gaze direction of the eye 14 to be inspected, and a gaze detected by the gaze direction detection unit 30. Gazing point position measuring unit 32 for obtaining the gazing point position of the eye 14 to be examined, the gazing point position obtained by the gazing point position measuring unit 32, and the observation target 10 in the line of sight at the time of obtaining the gazing point position. And a coordinate comparing unit 40 for comparing the coordinate value of the gazing point.
[0012]
In the device configured as described above, the image obtaining unit 20 obtains a stereo image including the line-of-sight direction. Typically, the image of the observation target 10 is included in the stereo image. The coordinate obtaining unit 22 obtains three-dimensional coordinate values of the observation target object 10 in the line of sight direction based on the stereo image obtained by the image obtaining unit 20. I do. The gazing point position measuring unit 32 obtains the gazing point position of the eye 14 from the line of sight detected by the sight line direction detecting unit 30. The coordinate comparing unit 40 detects the gazing point position obtained by the gazing point position measuring unit 32 and the line of sight at the time when the gazing point position is obtained by the line of sight direction detecting unit 30, and detects the observation target in the line of sight. The deviation is obtained by comparing with the coordinate values of 10. The deviation obtained by the coordinate comparing unit 40 is considered to be useful information for an inspection when new eyeglasses are worn, for example.
[0013]
The three-dimensional observation state measuring apparatus of the present invention that achieves the above object includes, for example, as shown in FIG. 3, an image acquisition unit 20 that acquires a stereo image including a line-of-sight direction, and a stereo image acquired by the image acquisition unit 20. A coordinate acquisition unit 22 that acquires the three-dimensional coordinate value of the observation target object 10 in the line-of-sight direction, a line-of-sight direction detection unit 30 that detects the line-of-sight direction of the eye 14, and a refraction that measures the refractive power of the eye 14. A second coordinate comparison for comparing the focus position of the eye 14 obtained by the force measurement unit 34 and the refractive power measurement unit 34 with the coordinate value of the observation object 10 in the line of sight at the time when the focus position is obtained. A part 42.
[0014]
In the device configured as described above, the image obtaining unit 20 obtains a stereo image including the line-of-sight direction. Typically, the image of the observation target 10 is included in the stereo image. The coordinate obtaining unit 22 obtains three-dimensional coordinate values of the observation target object 10 in the line of sight direction based on the stereo image obtained by the image obtaining unit 20. I do. The refractive power measurement unit 34 measures the refractive power of the eye 14 to be inspected, and can obtain focus position information of the eye 14 to be inspected. The second coordinate comparison unit 42 detects the focus position of the subject's eye 14 obtained by the refractive power measurement unit 34 and the gaze direction at the time when the focus position was obtained by the gaze direction detection unit 30, and determines the gaze direction. Is compared with the gaze coordinate value of the observation target in. The deviation obtained by the second coordinate comparing unit 42 is considered to be useful information for an inspection when new glasses are worn, for example.
[0015]
The three-dimensional observation state measuring apparatus of the present invention that achieves the above object includes, for example, as shown in FIG. 6, an image acquisition unit 20 that acquires a stereo image including a line-of-sight direction, and a stereo image acquired by the image acquisition unit 20. A coordinate acquisition unit 22 that acquires the three-dimensional coordinate value of the observation target in the gaze direction, a gaze direction detection unit 30 that detects the gaze direction of the eye 14, and a refractive power that measures the refractive power of the eye 14. A measuring unit 34, a gazing point position measuring unit 32 that obtains a gazing point position of the subject's eye 14 from the gaze direction detected by the gaze direction detecting unit 30, a gazing point position obtained by the gazing point position measuring unit 32, The first coordinate comparison unit 40 that compares the coordinate value of the observation target object 10 in the line of sight at the time when the fixation point position is obtained, the focus position obtained by the refractive power measurement unit 34, and the focus position are obtained. In the gaze direction at the time And a second coordinate comparison unit 42 for comparing the coordinate values of the observation object 10.
[0016]
In the three-dimensional observation state measuring apparatus, preferably, the apparatus further includes a dichroic mirror 16 arranged in front of the eye 14 and reflecting infrared light, and the refractive power measuring unit 34 includes the dichroic mirror 16 of the eye 14. With the arrangement arranged on the axis, the arrangement of devices in the case where devices for measuring eye characteristics, such as the line-of-sight direction detection unit 30 and the refractive power measurement unit 34, are provided in parallel, is compact.
[0017]
In the three-dimensional observation state measuring device, for example, as shown in FIG. 6, preferably, further, a pupil diameter measuring unit 37 for measuring a pupil diameter of the eye 14 to be inspected, or a blink measuring unit for measuring blinking of the eye 14 to be inspected With the configuration including 38, the physiological function of the eye as a sign of eye fatigue occurring to the viewer can be measured.
[0018]
Preferably, in the three-dimensional observation state measuring device, if the refractive power of the subject's eye and the temporal change in the line of sight are measured, the deviation obtained by the coordinate comparing unit 40 and the second coordinate comparing unit 42 By using the time-dependent change of the eye, an eye fatigue mechanism occurring to the viewer can be observed.
[0019]
In the three-dimensional observation state measuring method using a computer according to the present invention that achieves the above object, for example, as shown in FIG. 2, a stereo image including a line-of-sight direction is acquired by an image acquiring unit 20 (S102), and based on the stereo image The coordinate acquisition unit 22 acquires the three-dimensional coordinate value of the observation target 10 in the line of sight (S104), the line-of-sight direction detection unit 30 detects the line-of-sight direction of the eye 14 (S108), and the gazing point position measurement unit. 32, the gazing point position of the subject's eye 14 is obtained from the line of sight detected by the sight line direction detecting unit 30 (S110), and the gazing point position obtained by the gazing point position measuring unit 32 and the gazing point position are obtained. There is a step of comparing the gaze coordinate values of the observation target object 10 in the viewing direction at the time (S112 to S116).
[0020]
In the three-dimensional observation state measurement method using a computer according to the present invention that achieves the above object, as shown in FIG. 4, for example, a stereo image including a line of sight is acquired by an image acquisition unit 20 (S202), and based on the stereo image. The three-dimensional coordinate value of the observation object 10 in the line-of-sight direction is acquired by the coordinate acquisition unit 22 (S204), the line-of-sight direction of the eye 14 is detected by the line-of-sight direction detection unit 30 (S208), and the refractive power measurement unit 34 And the focus position is determined (S212), and the focus position obtained by the refractive power measurement unit 34 and the gazing coordinates of the observation target 10 in the line of sight at the time the focus position is obtained. It has a step of comparing with the values (S214, S216).
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating the configuration of the first embodiment of the present invention. The three-dimensional observation state measurement device includes a dichroic mirror 16, an image acquisition unit 20, a coordinate acquisition unit 22, a gaze direction detection unit 30, a gazing point position measurement unit 32, a coordinate comparison unit 40, and a gaze direction coordinate calculation unit 41. This is for measuring a state in which the subject is observing the observation object 10.
Here, the observation object 10 is a three-dimensional visible object such as a doll or a structure, and may be stationary or a movable body.
[0022]
A dichroic mirror (Dichroic Mirror) 16 is a mirror that reflects only light in a specific wavelength region and transmits light in the remaining wavelength region by using light interference by a thin film. Here, the dichroic mirror 16 is installed between the subject's eye 14 and the observation target 10, reflects infrared light emitted by the line-of-sight direction detection unit 30 in the direction of the subject's eye 14, and Transmits visible light.
[0023]
The image acquisition unit 20 acquires a stereo image including the line of sight direction, and typically uses a stereo camera. A stereo camera is one that shoots an object with a camera having the same characteristics on the left and right separated by a base line distance, and the parallax of the left and right images taken by the stereo camera is important as three-dimensional height direction information, It is configured so that a photographic image with very little lens aberration can be obtained. An observation target 10 is provided in the line of sight of the teleo camera, and the magnification is considered so that the stereoscopic image includes the image of the observation target 10. If the observation target object 10 is a stationary body, the left and right images can be created with the shooting location of one camera separated by the base line distance to be a stereo image.
[0024]
The coordinate obtaining unit 22 obtains three-dimensional coordinate values of the observation target 10 based on the stereo images obtained by the image obtaining unit 20, and uses, for example, the position of the subject's eye 14 as a reference point of the coordinate values. The coordinate acquisition unit 22 uses, for example, calibration information adjusted so that three-dimensional coordinates can be obtained for a stereo image obtained by the image acquisition unit 20 in advance. As the calibration information, various parameters of the stereo image captured by the image obtaining unit 20, for example, the focal length of the lens and the value of the lens aberration are obtained using a calibrator having a known size. Such calibration information can be obtained by, for example, a surface shape measuring device using a calibrator disclosed in Japanese Patent Application Laid-Open No. 2003-42730 and 42732 proposed by the present applicant. In addition, the coordinate acquisition unit 22 places the calibration body disclosed in Japanese Patent Application Laid-Open No. 2003-42726, which is proposed by the present applicant, at the installation location of the observation target 10 and calculates the distance from the eye to be examined to the calibration body. The direction may be measured in advance, and the three-dimensional coordinate value of the observation target 10 may be set using the measurement result of the calibration body.
[0025]
The line-of-sight direction detection unit 30 detects the line-of-sight direction of the eye 14 to be inspected, and typical detection principles include a corneal detection method and a scleral reflection method. The corneal detection method is a method of forming a virtual image on the cornea by radiation of an infrared LED (Light Emitting Diode) and detecting the movement of the virtual image as the eyeball moves. The scleral reflection method irradiates the eyes with weak infrared rays, and utilizes the fact that the amount of reflected infrared light differs between the black eyes and the white eyes.
[0026]
The gazing point position measuring unit 32 obtains the gazing point position of the eye 14 from the line of sight detected by the sight line direction detecting unit 30. Since the subject observes the observation object 10 with the left and right eyes, the gaze direction detection unit 30 detects the gaze directions of the left and right eyes 14 and obtains the intersection of the left and right gaze directions. Can be obtained.
[0027]
The gaze direction coordinate calculation unit 41 calculates a gaze coordinate value that is an intersection with the observation target 10 in the gaze direction at the time when the gaze point position is obtained by the gaze point measurement unit 32. That is, since the observation target 10 has a size as a stereoscopic image, the line-of-sight direction coordinate calculation unit 41 uses the line-of-sight direction information of the left and right subject eyes 14 detected by the line-of-sight direction detection unit 30 to calculate the left and right The coordinate value of the observation target object 10 corresponding to the gazing point is obtained by the subject's eye 14. When the line of sight of the left and right eyes 14 and the surface of the observation object 10 are not substantially converged at one point, only one of the left and right eyes 14 is gazing at the surface portion of the observation object 10. Since it is considered that there is no state, the line-of-sight direction coordinate calculation unit 41 adopts only the line of sight of the effective eye or an intermediate position in the direction in which the left and right eyes 14 are looking at the observation object 10. It is advisable to take appropriate measures such as
[0028]
The coordinate comparing unit 40 compares the gazing point position obtained by the gazing point position measuring unit 32 with the coordinate value of the observation target 10 obtained by the gaze direction coordinate calculating unit 41, and obtains a difference between the two. Then, the coordinate comparing unit 40 compares the divergence amount between the gazing point and the gazing coordinate value with a reference value set for identifying the degree of eye fatigue of the subject, and determines whether the left and right eyes 14 are healthy. It is determined whether the subject is in a normal state or in an eye fatigue state. The reference value set in the coordinate comparison unit 40 is set using a standard subject adjustment function in a group examination or the like, and when set for an individual subject, the reference value of the individual subject is set. The setting may be made using the inspection history of the examiner.
[0029]
The operation of the device configured as described above will now be described. FIG. 2 is a flowchart showing an example of a three-dimensional observation state measuring method using the apparatus of FIG. First, the observation target 10 is placed near the three-dimensional observation state measuring device (S100). Then, the image acquisition unit 20 acquires a stereo image including the line-of-sight direction (S102), and based on the stereo image, the coordinate acquisition unit 22 acquires three-dimensional coordinate values of the observation target 10 in the line-of-sight direction (S104). Next, the subject is guided to a predetermined position of the three-dimensional observation state measuring device, for example, on the optical axis of the dichroic mirror 16 and the observation target 10 (S106).
[0030]
Then, the three-dimensional observation state measurement device detects the gaze direction of the eye 14 by the gaze direction detection unit 30 (S108), and the left and right eyes to be detected detected by the gaze direction detection unit 30 by the gazing point position measurement unit 32. The gazing point position of the subject's eye 14 is determined from the viewing direction of the eye 14 (S110). The gaze direction coordinate calculation unit 41 calculates a gaze coordinate value that is the gaze direction at the time when the gaze point position is obtained by the gaze direction detection unit 30 and that is an intersection with the observation target object 10 (S112).
[0031]
Then, the coordinate comparing unit 40 compares the gazing point position obtained by the coordinate gazing point position measuring unit 32 with the gazing coordinate value obtained in S112, and calculates a deviation amount (S114). Then, the coordinate comparing unit 40 compares whether the deviation amount is larger than the reference value (S116), and when it is larger, determines that the eye fatigue of the subject's eye is large (S118), and An instruction is given to stop observing the observation object 10 and take a rest (S120). On the other hand, if it is small in S116, it can be determined that the eye fatigue of the subject's eye is small, so that the subject is allowed to observe the observation target 10 (S122). The subject may return to S106 and continue observation of the observation target object 10.
[0032]
FIG. 3 is a block diagram illustrating the configuration of the second embodiment of the present invention. The three-dimensional observation state measuring device includes a dichroic mirror 16, a half mirror 8, an image acquisition unit 20, a coordinate acquisition unit 22, a gaze direction detection unit 30, a refractive power measurement unit 34, a gaze direction adjustment unit 36, and a gaze direction coordinate calculation unit 41. And a second coordinate comparing unit 42. In FIG. 3, the same elements as those described in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
[0033]
In the figure, the half mirror 8 branches the infrared light from the left and right eyes 14 reflected by the dichroic mirror 16 to a refractive power measuring unit 34 and a line-of-sight direction detecting unit 30. The refractive power measuring unit 34 measures the refractive power of the eye 14 to be examined, and a so-called objective type eye refractive power measuring device is used. In an objective-type eye refractive power measuring device, for example, a measurement target image is projected on the fundus of the eye to be inspected, and the refractive power of the eye to be inspected is measured based on the in-focus state of the measurement target image. The focus position on the visual axis can be obtained. In this case, the focus information can be obtained more precisely using the convergence angle. Here, convergence means that the visual axes of both eyes are concentrated on an object to be viewed, and the angle formed by the visual axes of both eyes is called a convergence angle.
[0034]
The gaze direction adjustment unit 36 also observes the direction of the eyeball at the same time as the gaze direction measurement by the gaze direction detection unit 30, and simultaneously rotates and moves the dichroic mirror 16 and the refractive power measurement unit 34 in accordance with the movement in the gaze direction. To match. The line-of-sight direction adjustment unit 36 can prevent the optical axis measured by the refractive power measurement unit 34 from shifting due to eye movement. The second coordinate comparison unit 42 compares the focus position obtained by the refractive power measurement unit 34 with the coordinate value of the observation target 10 obtained by the line-of-sight direction coordinate calculation unit 41, and obtains a difference between the two. . Then, the second coordinate comparing unit 42 compares the amount of deviation between the focus position and the gaze coordinate value with a reference value set for identifying the degree of eye fatigue of the subject, and compares the left and right eyes to be examined. It is determined whether 14 is in a healthy state or in an eye fatigue state.
[0035]
The operation of the device configured as described above will now be described. FIG. 4 is a flowchart showing an example of a three-dimensional observation state measuring method using the apparatus of FIG. First, the observation target 10 is set near the three-dimensional observation state measuring device (S200). Then, the image acquisition unit 20 acquires a stereo image including the line-of-sight direction (S202), and based on the stereo image, the coordinate acquisition unit 22 acquires three-dimensional coordinate values of the observation target 10 in the line-of-sight direction (S204). . Next, the subject is guided to a predetermined position of the three-dimensional observation state measuring device, for example, on the optical axis of the dichroic mirror 16 and the observation object 10 (S206).
[0036]
Then, the three-dimensional observation state measuring device detects the gaze direction of the subject's eye 14 by the gaze direction detection unit 30 (S208), and determines the gaze point position by the gaze direction detection unit 30 by the gaze direction coordinate calculation unit 41. A gaze coordinate value, which is the line-of-sight direction and an intersection with the observation target object 10, is calculated (S210). Further, the focus position of the subject's eye 14 is determined by the refractive power measuring unit 34 (S212). In this case, information on the convergence angle measured by the refractive power measurement unit 34 may be added.
[0037]
Then, the second coordinate comparing unit 42 compares the focus position obtained by the refractive power measuring unit 34 with the gaze coordinate value obtained in S210, and calculates the amount of deviation (S214).
Next, the second coordinate comparison unit 42 compares whether the deviation amount is larger than the reference value (S216), and when it is larger, determines that the eye fatigue of the subject's eye is increased (S218), The subject is instructed to stop viewing the three-dimensional image and to take a rest (S220). On the other hand, if it is small in S216, it can be determined that the eye fatigue of the subject's eye is small, so that the subject is allowed to observe the observation target 10 (S222). The subject may return to S206 and continue to observe the observation target object 10.
[0038]
FIG. 5 is a flowchart illustrating details of S210 in FIG. First, infrared light is incident on the subject's eye 14 by the refractive power measurement unit 34 (S252). Then, the refractive power measurement unit 34 projects the ring-shaped index on the fundus, and performs fine alignment following coarse alignment (S254, S256). Then, the dichroic mirror 16 is changed according to the congestion (S258). Then, the refractive power measuring unit 34 measures the ring-shaped shape projected on the fundus by the fundus image detecting unit arranged in a conjugate relationship with the fundus, and measures the deformation of the shape to obtain the refractive power (S260). ). Further, the refractive power measuring unit 34 can measure the pupil diameter and, if necessary, the convergence. The refractive power measurement unit 34 can determine the focus position where the eye is focused from the measured refractive power. Then, it is determined whether or not the measurement time has ended (S262). If the measurement time has not ended, the process returns to S256 to continue the measurement. If finished, return.
[0039]
FIG. 6 is a block diagram illustrating the configuration of the third embodiment of the present invention. In the third embodiment, the coordinate comparison unit 40 in the first embodiment is combined with the second coordinate comparison unit 42 in the second embodiment. Further, the half mirror 19 is provided between the dichroic mirror 16 and the observation target 10, and guides the image of the eye 14 to the pupil diameter measurement unit 37 and the blink measurement unit 38. The pupil diameter measuring unit 37 measures the pupil diameter. The blink measurement unit 38 measures the number of blinks of the subject's eye 14. The eye fatigue determination unit 39 compares the pupil diameter measured by the pupil diameter measurement unit 37 with a reference value of the pupil diameter when the subject looks at an image close to the subject, and determines whether the pupil contraction is performed normally. To determine eye fatigue. The eye fatigue determining unit 39 compares the number of blinks of the eye 14 measured by the blink measuring unit 38 with the number of standard blinks in a state where the eye adjustment function is sufficiently exhibited. If the number of times has decreased, it is determined that the subject is in eye fatigue state.
[0040]
With this configuration, the gazing point position obtained by the gazing point position measuring unit 32 and the gazing point position obtained by the refractive power measuring unit 34 are obtained for the coordinate values of the observation target 10 obtained by the gaze direction coordinate calculating unit 41. The degree of eye fatigue of the subject's eye can be measured using the two information of the focus position, and the measurement reliability is improved.
[0041]
Further, as a physiological function of a healthy eye, there is a tendency that the pupil becomes small when looking at a close place, but the function of adjusting the size of the pupil by the pupil diameter measurement by the pupil diameter measurement unit 37. Is responding correctly. In addition, as a physiological function of healthy eyes, blinking is performed at a certain frequency.However, in the state of eye strain, the number of blinks decreases and the surface of the cornea dries, A phenomenon that the degree of fatigue further increases is known. Therefore, it is preferable that the blink measurement unit 38 measures the number of blinks of the subject to observe signs of eye fatigue.
[0042]
In the above-described embodiment, the degree of eye fatigue of the subject's eye is measured by using a gaze direction detecting unit or a refractive power measuring unit as a three-dimensional observation state measuring device and measuring the visual acuity for a relatively short time of about several minutes. However, the present invention is not limited to this. For example, the temporal change of the eye fatigue degree is measured using the temporal change information of the gazing point position and the focus position for a relatively long time of about several hours. You may do so.
[0043]
【The invention's effect】
As described above, according to the three-dimensional observation state measuring device of the present invention, the image acquisition unit that acquires a stereo image including the line of sight, and the observation of the line of sight based on the stereo image obtained by the image acquisition unit A coordinate acquisition unit that acquires three-dimensional coordinate values of the target object, a gaze direction detection unit that detects a gaze direction of the eye to be inspected, and a gazing point position of the eye to be inspected from the gaze detected by the gaze direction detection unit A gazing point position measuring unit, and a coordinate comparing unit for comparing the gazing point position obtained by the gazing point position measuring unit with the gazing coordinate value of the observation target in the line of sight at the time when the gazing point position is obtained. With the configuration, the direction and distance of the observation object viewed by the subject are dynamically and three-dimensionally measured by the image acquisition unit and the coordinate acquisition unit, and the three-dimensional measurement position and the subject's By comparing with the fixation point position , Eye fatigue state can be accurately inspected.
[0044]
Further, according to the three-dimensional observation state measuring device of the present invention, an image acquisition unit that acquires a stereo image including the line-of-sight direction, and based on the stereo image obtained by the image acquisition unit, the observation object in the line-of-sight direction A coordinate acquisition unit that acquires three-dimensional coordinate values, a gaze direction detection unit that detects the gaze direction of the eye to be inspected, a refractive power measurement unit that measures the refractive power of the eye to be inspected, and a refractive power measurement unit that is obtained by the refractive power measurement unit The configuration includes a second coordinate comparison unit that compares the focus position of the eye to be inspected and the gaze coordinate value of the observation target in the line of sight at the time of obtaining the focus position. The direction and distance of the object to be observed are dynamically and three-dimensionally measured by the image acquisition unit and the coordinate acquisition unit, and the three-dimensional measurement position is compared with the focus position of the eye to be examined, so that the eye fatigue state is obtained. Can be accurately inspected. In addition, since the refractive power measurement unit can easily measure the eye characteristics such as the refractive power, convergence, and pupil diameter of the viewer's eye to be inspected, for example, an examination at the time of wearing new glasses can be accurately obtained as information suitable for correction. it can. In addition, since the focus position of the subject's eye can be measured with the left and right eyes, the optical system is simpler than in the case where both the left and right eyes are always required to obtain the gaze point position as in the gaze point measurement unit. Can be
[Brief description of the drawings]
FIG. 1 is an overall configuration block diagram for explaining a first embodiment of the present invention.
FIG. 2 is a flowchart showing an example of a three-dimensional observation state measuring method using the apparatus of FIG.
FIG. 3 is an overall configuration block diagram for explaining a second embodiment of the present invention.
FIG. 4 is a flowchart illustrating an example of a three-dimensional observation state measuring method using the apparatus of FIG. 3;
FIG. 5 is a flowchart illustrating details of S210 in FIG. 4;
FIG. 6 is a configuration block diagram illustrating a third embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 observation object 14 eye 20 to be examined 20 image acquisition unit 22 image coordinate acquisition unit 30 gaze direction detection unit 32 gaze point measurement unit 34 refractive power measurement unit 37 pupil diameter measurement unit 38 blink measurement units 40, 42 coordinate comparison unit 41 gaze direction Coordinate calculator

Claims (8)

An image acquisition unit for acquiring a stereo image including the line of sight;
A coordinate acquisition unit that acquires three-dimensional coordinate values of the observation target in the line-of-sight direction based on the stereo image obtained by the image acquisition unit;
A gaze direction detection unit that detects a gaze direction of the eye to be inspected;
A gazing point position measuring unit that obtains a gazing point position of the eye to be inspected from the sight line detected by the sight line direction detecting unit;
A three-dimensional observation state measurement comprising: a gazing point position obtained by the gazing point position measuring section; and a coordinate comparing section for comparing the gazing coordinate value of the observation target in the line of sight at the time of obtaining the gazing point position. apparatus. An image acquisition unit for acquiring a stereo image including the line of sight;
A coordinate acquisition unit that acquires three-dimensional coordinate values of the observation target in the line-of-sight direction based on the stereo image obtained by the image acquisition unit;
A gaze direction detection unit that detects a gaze direction of the eye to be inspected;
A refractive power measuring unit for measuring the refractive power of the eye to be examined;
A second coordinate comparing unit that compares the focus position of the eye to be inspected obtained by the refractive power measurement unit and the gaze coordinate value of the observation target in the line of sight at the time of obtaining the focus position. Original observation state measurement device. An image acquisition unit for acquiring a stereo image including the line of sight;
A coordinate acquisition unit that acquires three-dimensional coordinate values of the observation target in the line-of-sight direction based on the stereo image obtained by the image acquisition unit;
A gaze direction detection unit that detects a gaze direction of the eye to be inspected;
A refractive power measuring unit for measuring the refractive power of the eye to be examined;
A gazing point position measuring unit that obtains a gazing point position of the eye to be inspected from a gaze direction detected by the gaze direction detecting unit;
A first coordinate comparison unit that compares the fixation point position obtained by the fixation point position measurement unit with the fixation coordinate value of the observation target in the line of sight at the time when the fixation point position is obtained; A second coordinate comparison unit that compares the focus position obtained by the unit with the gaze coordinate value of the observation target in the line of sight at the time of obtaining the focus position. The three-dimensional observation state measuring apparatus further includes a dichroic mirror disposed in front of the subject's eye and reflecting infrared light;
The refractive power measurement unit is disposed on a reflection optical axis including the dichroic mirror of the eye to be inspected;
The three-dimensional observation state measuring device according to any one of claims 1 to 3. The three-dimensional observation state measuring apparatus further includes a pupil diameter measurement unit that measures a pupil diameter of the eye to be inspected, or a blink measurement unit that measures blinking of the eye to be inspected;
The three-dimensional observation state measuring device according to any one of claims 1 to 3. The three-dimensional observation state measuring device according to any one of claims 1 to 5, wherein the three-dimensional observation state measurement device is configured to measure a temporal change in a refractive power and a line-of-sight direction of the eye to be inspected. Acquiring a stereo image including the line-of-sight direction by the image acquisition unit;
Based on the stereo image, a coordinate acquisition unit acquires three-dimensional coordinate values of the object in the line-of-sight direction;
A gaze direction detector for detecting a gaze direction of the subject's eye;
A gazing point position measuring unit that determines a gazing point position of the subject's eye from the line of sight detected by the sight line direction detecting unit;
A gazing point position obtained by the gazing point position measuring unit is compared with a gazing coordinate value of an observation target in a line of sight at the time when the gazing point position is obtained; a three-dimensional observation state measuring method using a computer. Acquiring a stereo image including the line-of-sight direction by the image acquisition unit;
Based on the stereo image, a coordinate acquisition unit acquires three-dimensional coordinate values of the object in the line-of-sight direction;
A gaze direction detector for detecting a gaze direction of the subject's eye;
A refractive power measuring unit measures the refractive power of the eye to be examined and determines a focus position; a focus position obtained by the refractive power measuring unit, and a gazing coordinate of the observation target in a line of sight at the time when the focus position is determined. Compare with the value; a method of measuring the three-dimensional observation state using a computer.

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