KR102112339B1 - method and apparatus for automatic measurement of deviation angle in strabismus - Google Patents

Abstract

The present invention relates to an automatic angle of view measurement method and an automatic angle of view measurement device using the same, and more specifically, the position of the cornea while moving the positions of the left image viewed by the left eye and the right image viewed by the right eye according to a biased visual axis. The present invention relates to a method for automatically measuring an angle of view capable of accurately and automatically measuring a subject's angle of view by analyzing a change, and an apparatus for automatically measuring the angle of view using the same.
The automatic viewing angle measuring device of the present invention is installed inside the main body, and an image output unit for separately outputting a left image visible to the left eye and a right image visible to the right eye, and an interior of the main body. It is provided with a photographing unit for photographing the left and right eyes looking at the image output unit, a control unit for adjusting the positions of the left image and the right image, and calculating the degree of deviation of the cyan eye from the photographed image obtained through the photographing unit.

Description

Method for automatically measuring the angle of deviation and a device for automatically measuring the angle of deviation using the same

The present invention relates to an automatic angle of view measurement method and an automatic angle of view measurement device using the same, and more specifically, the position of the cornea while moving the positions of the left image viewed by the left eye and the right image viewed by the right eye according to the biased visual axis. The present invention relates to a method for automatically measuring an angle of view capable of accurately and automatically measuring a subject's angle of view by analyzing a change, and an apparatus for automatically measuring the angle of view using the same.

Strabismus is a visual impairment in which two eyes are not aligned and looking at different points. In the case of strabismus, when one eye faces the front, the other eye turns inward or outward, or turns upward or downward to deflect. Deviation angle is an objective measure of the degree of this deviation.

Methods for measuring the deviation of the eyeball in the ophthalmology field are required in various treatment areas, and more accurate measurement of the deviation of the eyeball is required for more accurate treatment. In particular, in the case of strabismus patients, accurate measurement of the angle of view must be accompanied to relieve or correct the strabismus symptoms by accurate treatment.

Although various methods are used as the angle of view measurement method, the Prism Cover Test (PCT) is the most widely used clinically.

The prism cover test is a method of measuring a viewing angle using a prism, and is a method of finding a viewing angle of a test subject by alternately placing a prism having a plurality of different refractive indices one by one in front of the test subject's eyes.

However, such an inspection method has the disadvantage that the deviation of the measured value may be large and an error may occur depending on the experience and skill of the examiner, since the examiner measures and calculates the patient's strabismus manually.

To solve this problem, Korean Patent Registration No. 10-1761635 discloses a method and apparatus for measuring a perspective angle.

The patent has a merit that a more objective and accurate strabismus judgment is possible compared to a conventional prism cover test because the perspective angle is measured by comparing a camera image before and after blocking one eye's field of view and measuring the distance of movement of the eyeball. However, the above patent has a problem in that both the field of view and the image taking are manually performed.

Korean Patent Registration No. 10-1812249 discloses an automatic strabismus measuring instrument.

The strabismus automatic measuring mechanism is provided with a frame including an alternative hole formed on one side in contact with both eyes and an observation hole formed on the other side, and provided in the interior space of the frame and arranged to correspond to the front of both eyes. The spectroscopic glass is provided so as to be provided, and the recognition camera is provided on the upper side of the spectroscopic glass to shoot both eyes through the spectroscopic glass, the shielding control device is provided in the observation hall to selectively shield the observation hole, and is connected to the recognition camera. It includes a displacement analysis unit that measures the strabismus by analyzing the displacements of both eyes generated by the shielding control device.

The automatic strabismus measuring instrument has the advantage of being excellent in convenience in that it can be worn on a face to automatically measure the strabismus angle.

However, there is a problem in that a camera that shoots both eyes and an image output device that illuminates both eyes are fixed at a specific location. Since the distance between both eyes is different for each person, the camera and the image need to be positioned at the center of each eye for accurate angle of view measurement.

In addition, the patent measures the angle of view through displacement of the eyeball by shielding the left and right eyes, but there is no process to finally verify the measured angle of view, so that the kappa angles of both eyes are different or ARC (abnormal retina response) ) There is a problem that it is difficult to cope with rare strabismus abnormalities.

1. Republic of Korea Registered Patent No. 10-1761635: Angle of view measurement method and device 2. Republic of Korea Registered Patent No. 10-1812249: Automatic strabismus measuring instrument

The present invention was created to improve the above problems, and the left image viewed by the left eye and the right image viewed by the right eye are separated from each other and output as two images, and configured to move the positions of each image. The objective of the present invention is to provide a method for automatically measuring an angle of view that can accurately measure the angle of view by analyzing the positional change of the cornea of the eye, while moving the image to be aligned with the time axis of the eye, and to provide a device for automatically measuring the angle of view using the same.

The automatic viewing angle measuring device of the present invention for achieving the above object is a main body; A video output unit installed on the main body to separately output a left image visible to the left eye and a right image visible to the right eye; A photographing unit installed on the main body and photographing the left and right eyes facing the image output unit; It is provided with a control unit for adjusting the position of the left image and the right image, and calculating the degree of deviation of the cyan eye from the captured image obtained through the photographing unit.

It is installed on the main body and further includes a light source unit that irradiates light to the left and right eyes.

The main body includes a cover housing and a blocking member installed inside the cover housing to separate the inside of the cover housing into a left space part corresponding to the left eye and a right space part corresponding to the right eye.

The image output unit outputs the left image to the left space portion and outputs the right image to the right space portion.

The image output unit is provided as one display for separating and outputting the left image and the right image from side to side.

The image output unit is provided with a left-eye display for outputting the left image and a right-eye display for outputting the right image.

The display is formed as a curved surface.

The photographing unit is provided with a left-eye camera installed in the left space unit to photograph the left eye, and a right-eye camera installed in the right space unit to photograph the right eye.

The left-eye camera and the right-eye camera are further provided with camera moving means for independently moving each.

A first external camera installed on the main body to obtain a first external image image by photographing the front of the main body, and a second external image installed on the main body to acquire a second external image image by photographing the front of the cover housing. A camera is further provided, and the first external image image is output as the left image and the second external image image is output as the right image through the image output unit.

And the automatic angle of view measurement method of the present invention for achieving the above object is an image interval adjustment step of adjusting the distance between the left image visible to the left eye and the right image visible to the right eye according to the distance of both eyes of the subject; A discriminating step of comparing the change in the corneal position of the left and right eyes from the primary photographed image of the left and right eyes of the subject to discriminate between the eyesight and the eyesight; And a calculation step of calculating a deviation angle of the deviation of the eyesight determined in the determination step and calculating a perspective angle.

And a verification step of verifying whether the perspective angle is correct after the calculation step.

The verification step comprises: a) moving any one of the left and right images corresponding to the cyan by the movement value calculated from the perspective angle, and b) a second image of the left and right eyes of the subject And comparing whether the image moved through the positional change of the cornea corresponding to the strabismus from the captured image coincides with the strabismus visual axis.

In the verification step, if there is a change in the position of the cornea corresponding to the cyanide, the re-validation step of correcting and re-validating the viewing angle; further includes.

The re-validation step comprises: a) analyzing a change in the position of the cornea corresponding to the cyan from the secondary photographed image to obtain a correction amount of the perspective angle, and b) the left and right images as much as the shift value calculated from the correction amount Among them, the step of moving any one of the image position corresponding to the cyan, and c) comparing the position change of the cornea corresponding to the cyan from the third photographed image of the left and right eyes of the subject.

When there is no change in the position of the cornea corresponding to the cyan in the third photographed image, the corrected perspective angle is calculated by calculating the correction amount in the perspective angle.

The discriminating step is a) taking the left eye looking at the left image while simultaneously outputting the left and right images to obtain a first left eye image, and taking a right eye looking at the right image to obtain a first right eye image. And b) photographing the left eye looking at the left image when outputting the left image while alternately outputting the left and right images to obtain a second left eye image, and the right image when outputting the right image. Acquiring a second right-eye image by photographing the right eye, and c) comparing corneal position changes between the first left-eye image and the second left-eye image, and comparing the first right-eye image and the second right-eye image. And comparing corneal position changes.

In the determining step, a first external image image obtained by photographing the front of the subject is output as the left image, and a second external image image obtained by photographing the front of the subject is output as the right image.

In the calculating step, a perspective angle is calculated by comparing the kappa angle obtained from the main cyan or the cyan with the deviation angle obtained from the cyan.

The calculating step comprises: a) obtaining the main corneal reflection image and the cyan corneal reflection image by photographing the main cyan and the cyan with light on the main cyan and the cyan, and b) obtaining the main corneal reflection image. Calculating a kappa angle of the main cyan by measuring a distance between the center of the cornea and the reflection point generated in the cornea of the main cyan through c), and c) the center of the cornea and the reflection point generated in the cornea of the cyan through the corneal reflection image of the cyan. And measuring a distance to calculate the deviation angle of the cyan, and d) calculating a perspective angle of the cyan by comparing the kappa angle of the main cyan and the deviation angle of the cyan.

The discriminating step is a) taking the left eye looking at the left image while simultaneously outputting the left and right images to obtain a first left eye image, and taking a right eye looking at the right image to obtain a first right eye image. And b) in the state of outputting the left and right images alternately, the right eye is photographed when the left image is output to obtain a second right eye image, and when the right image is output, the left eye image is photographed to obtain the second left eye image. Acquiring, and c) comparing corneal positional changes between the first left-eye image and the second left-eye image, and comparing corneal positional changes between the first right-eye image and the second right-eye image.

As described above, according to the present invention, by using two images and a camera that can be moved up and down or left and right, the image can be viewed and photographed at the center of each eye according to the distance between both eyes of the subject, so that more accurate measurement of angle of view is possible. It is possible.

In addition, the present invention is based on the first angle of view calculated based on the first angle through the verification process of analyzing the change in the position of the cornea of the right angle while moving the image viewed by the right angle to the time axis of the right angle. Can be confirmed.

As a result, it is possible to accurately measure the angle of view, and to effectively cope with rare strabismus abnormalities such as different kappa angles of both eyes or ARC (abnormal retina response).

1 is a perspective view of an automatic viewing angle measuring device according to an embodiment of the present invention,
Figure 2 is a front view schematically showing the interior of Figure 1,
Figure 3 is a side view schematically showing the interior of Figure 1,
Figure 4 is a plan view schematically showing the interior of Figure 1,
5 is a perspective view excerpting the main portion applied to FIG. 1,
6 is a block diagram of FIG. 1,
7 is a plan view schematically showing the inside of an automatic viewing angle measuring device according to another example of the present invention,
8 is a plan view schematically showing the inside of an automatic viewing angle measuring device according to another example of the present invention,
9 is a front view schematically showing the inside of the automatic viewing angle measuring device according to another embodiment of the present invention,
10 is a side view schematically showing the interior of FIG. 9,
11 is a plan view schematically showing the interior of FIG. 9,
12 is a schematic diagram conceptually showing a state when both eyes of a normal person looks at an object,
13 is a schematic diagram for calculating the kappa angle of the right eye in FIG. 12,
14 is a schematic diagram conceptually showing a state when both eyes of a patient are looking at an object,
15 is a picture showing the corneal reflection of normal people,
Figure 16 is a picture showing the corneal reflection of the patient with the right eye is endoscopic,
17 is a view showing the corneal reflex point of the patient with the right eye is exotropia,
18 is a corneal reflex image of both eyes of a patient whose right eye is endoscopic,
19 is a corneal reflection image of both eyes of a patient whose right eye is exotropia,
20 is an image of corneal reflex in both eyes of a patient whose left eye is endoscopic,
21 is a corneal reflex image of both eyes of a patient whose left eye is exotropia,
22 is a diagram showing a change in the position of the corneal reflection point according to the degree of deviation of the cyan,
23 is a schematic diagram showing the deviation distance and the deviation angle of the main eye,
24 is a schematic diagram showing the deviation distance and the deviation angle of the cyan.

Hereinafter, a method for automatically measuring a viewing angle according to a preferred embodiment of the present invention and an apparatus for automatically measuring a viewing angle using the same will be described in detail with reference to the accompanying drawings.

1 to 6, the automatic viewing angle measuring device according to an embodiment of the present invention is installed inside the main body 6, the left image 11 and the right eye that can be seen by the left eye An image output unit 10 for separating and outputting the right image 13 that can be viewed from each other, and a photographing unit that is installed inside the main body 6 and photographs the left and right eyes facing the image output unit 10, It is provided with a control unit 100 for adjusting the positions of the left image 11 and the right image 13 and calculating the degree of deviation of the cyan eye from the captured image obtained through the image capturing unit.

The main body 6 is located in front of the subject's face. Therefore, the subject can look inside the body 6 through the left and right eyes.

The main body 6 may be made of a structure that can be worn on a face in a wearable manner.

On the other hand, the body is formed larger than the wearable method, and thus may be installed on the floor or table in the room or on the support frame. In addition, the main body may be installed indoors or outdoors in a square shape such as a vending machine. In the case of such a main body, the subject can measure the angle of view while looking at the inside of the main body while sitting or standing in front of the main body.

 The main body 6 has a structure in which a blocking member 5 is installed inside the cover housing 1 constituting an external appearance so that the interior space of the cover housing 1 is divided into a left space part and a right space part.

Hereinafter, an example of a wearable body that can be worn on a face will be described.

The illustrated main body 6 is provided inside the cover housing 1 and the cover housing 1, and a blocking member separating the inside of the cover housing 1 into a left space part 3 and a right space part 4 (5) is provided.

The cover housing 1 is formed in a structure that can be located on the front of the face to cover both eyes. An empty space is formed inside the cover housing 1 and the front surface is blocked. The cover housing 1 can be worn on the face in a wearable manner.

To this end, a fixing means capable of fixing the cover housing 1 to the face may be further provided in the main body. As an example of the fixing means, a fixing belt 9 installed in the cover housing 1 is shown. The fixing belt 9 is coupled to be detachable to the patient's head. Of course, the cover housing 1 can be fixed to the face by applying various fixing means such as a helmet and a band instead of the fixing belt 9.

It is preferable that the rear surface of the cover housing 1 in contact with the face is bent in a curved shape in order to increase the adhesion with the face. In addition, a cushion portion 2 formed of a flexible material and contacting the face may be provided on the rear edge of the cover housing 1.

A blocking member 5 is installed inside the cover housing 1. The blocking member 5 is formed in a plate shape. The blocking member 5 serves to separate the interior of the cover housing 1 into two spaces, that is, the left space part 3 and the right space part 4. The left space portion 3 is a space corresponding to the left eye of the subject, and the right space portion 4 is a space corresponding to the right eye of the subject.

Although not shown, an illumination lamp for interior illumination may be installed in the cover housing 1. The lighting lamp can be applied with LEDs that can be adjusted step by step. The lighting lamps may be installed in the left space part 3 and the right space part 4, respectively. The left space part 3 and the right space part 4 can be kept bright or dark by the lighting lamp.

Optical lenses 7 and 8 are respectively installed on the left and right sides of the rear surface of the cover housing 1. The optical lenses 7 and 8 are spaced a certain distance from side to side. The optical lens 7 positioned on the left side corresponds to the left eye of the subject, and the optical lens 8 positioned on the right side corresponds to the right eye of the subject. The left eye of the subject can see the left space part 3 through the optical lens 7 on the left side, and the right eye space part 4 can be seen through the optical lens 8 of the right eye.

The optical lenses 7 and 8 allow the examinee to clearly view the left image 11 and the right image 13 output through the image output unit 10. As the optical lenses 7 and 8, an appropriate type of lens may be used according to the distance between the left image and the left eye and the distance between the right image and the right eye. For example, a convex lens can be applied as an optical lens. In addition, it is needless to say that a single lens or a combination of two or more lenses may be applied as the optical lens.

The optical lenses 7 and 8 may be installed to be moved from side to side by user manipulation. The left and right moving structures of the optical lenses 7 and 8 can be implemented using various well-known techniques.

The distance between the left and right eyes of a person, that is, the binocular distance is not the same. In general, children have a narrow binocular distance, and adults have a wide binocular distance. In addition, the binocular distance varies depending on the anatomy of the face at the same age. Therefore, as the optical lenses 7 and 8 can be moved to the left and right, it has the advantage of adjusting the distances of the two optical lenses 7 and 8 in accordance with the binocular distance of the subject.

On the other hand, as illustrated, an optical lens is not installed on the rear surface of the cover housing 1 and a through hole may be formed at the position. In this case, the left eye and the right eye can directly look at the left image 11 and the right image 13 through the through hole without passing through the optical lens.

The image output unit 10 is installed inside the cover housing 1. For example, the image output unit 10 may be installed inside the front surface of the cover housing 1.

The image output unit 10 outputs the left image 11 that the left eye can see and the right image 13 that the right eye can see. The left image 11 and the right image 13 are spatially separated. The left image 11 is located in the left space portion 3 and the right image 13 is located in the right space portion 4. By the blocking member 5, the left eye can see only the left image 11, and the right eye can see the right image 13 only.

Preferably, the center of the left image 11 is positioned to correspond to the center of the left eye, and the center of the right image 13 is positioned to correspond to the center of the right eye. The center of the left eye and right eye may mean the center of each eye. And the center of the eyeball may mean the anatomical center of the eyeball or the center of the cornea.

The image output unit 10 may output the images selected by the control unit 100 among the images stored in the memory unit 120 as the left image 11 and the right image 13, respectively. The left image 11 and the right image 13 may be still images such as photographs or videos such as movies and games.

The image output unit 10 may be implemented with one or two displays.

The illustrated example shows how to use one display. The screen of one display is divided into left and right regions and allocated to the left screen region and the right screen region respectively, and the left image 11 is output in the left screen region and the right image 13 is output in the right screen region. The two screen areas are divided left and right, and the left screen area is located in the left space part 3, and the right screen area is located in the right space part 4. When using one display, the blocking member 5 is positioned between the left screen area where the left image 11 is output and the right screen area where the right image 13 is output.

When using one display, the control unit 100 can adjust the position and size of the left image 11 in the left screen area, and can adjust the position and size of the right image 13 in the right screen area. Accordingly, the positions of the left image 11 and the right image 13 can be moved in the left-right direction or freely in the up-down direction under the control of the control unit 100. In addition, it is of course possible to obtain the effect of moving the left and right images by moving the display itself in the left or right or up and down direction by a mechanical method.

As the positions of the left image 11 and the right image 13 can be moved, different images can be output and shown for the examinee and the left eye and the right eye, and the location of the image can be adjusted according to the binocular distance of the examinee. Do. In addition, since only one of the left image and the right image can be independently moved, it is possible to precisely measure the angle of view by analyzing the change in the position of the cornea of the strabismus while moving the image of the strabismus side according to the visual axis. In addition, since only one image of the left image and the right image can be selectively output, a cover test is possible without covering one eye.

Also, in the illustrated example, the image output unit 10 shows a state in which a flat-formed display is used. Alternatively, as shown in FIG. 7, the image output unit 19 may use a curved display. A curved display curved in the left-right direction can reduce the distortion degree of an image.

In addition, although not shown, when the image output unit is implemented with two displays, the left-eye display may be installed in the left space portion and the right-eye display may be installed in the right space portion. Therefore, the two displays are separated left and right. The blocking member is located between the two displays. The left image is output through the screen of the left-eye display, and the right image is output through the screen of the right-eye display. Since the position and size of the left image or right image can be adjusted within each display screen, the position of the left image and the right image can be moved in the left-right direction or freely in the vertical direction by the control of the controller.

When the image output unit is implemented as two displays, each display may be formed as a curved surface. Preferably, a curved surface display can be used in both the left and right and up and down directions to use an aspherical display similar to the shape of the eyeball.

Inside the cover housing 1, a photographing unit for photographing the left and right eyes facing the image output unit 10 is installed.

The photographing unit may consist of one camera or two cameras. If it consists of one camera, the camera may be located in the center of the cover housing. In addition, in the case of two cameras, each of the left space part and the right space part is located one by one.

In the illustrated example, the photographing unit is provided with two cameras 20 and 25 to photograph the left and right eyes of the subject, respectively. The left eye camera 20 is installed in the left space portion 3, and the right eye camera 25 is installed in the right space portion 4. The left eye camera 20 photographs the left eye of the subject, and the right eye camera 25 photographs the right eye of the subject.

A high-resolution CCD camera can be used as the left-eye camera 20 and the right-eye camera 25. The left-eye video image taken by the left-eye camera 20 and the right-eye video image taken by the right-eye camera 25 are sent to the controller 100.

In the illustrated example, the left-eye camera 20 and the right-eye camera 25 are installed inside the front surface of the cover housing 1 and are located below the image output unit 10. The left-eye camera 20 is installed at a position corresponding to the center of the left image 11, and the right-eye camera 25 is installed at a position corresponding to the center of the right image 13.

In the present invention, the left-eye camera 20 and the right-eye camera 25 have a structure that can be respectively moved independently by a camera moving means. Accordingly, the position of the cameras 20 and 25 can be adjusted according to the binocular distance of the subject. In addition, since the cameras 20 and 25 can be freely moved in the left and right or up and down directions, precise angle of view measurement is possible.

The illustrated camera moving means is provided with a first transfer unit 30 and a second transfer unit (39). The first transfer unit 30 moves the left-eye camera 20, and the second transfer unit 39 moves the right-eye camera 25. The first and second transfer units 30 and 39 employ a method in which both left and right movements and vertical movements are possible. On the other hand, of course, you can only move left and right or up and down.

As an example, the first and second transfer parts 30 and 39 are provided with a stage 29 installed inside the front surface of the cover housing 1 and a left and right direction (X-axis direction) and up and down direction provided on the stage 29 ( Y-axis direction).

Since the first and second transfer parts 30 and 39 have the same structure only in different installation positions, the structure of the first transport part 30 illustrated in FIG. 5 will be described as an example.

A square stage 29 is installed under the image output unit. And the X-Y transfer unit is installed on the stage 29.

Various transfer devices can be used as X-Y transfer units. For example, a linear motor can be used. The linear motor consists of a structure in which the mover is coupled to a stator deployed and deployed in a straight line, and when the power is supplied, the mover performs a linear motion. This linear motor has an advantage of miniaturization and position control.

The illustrated XY transfer unit includes a pair of X-axis linear motors 31 and 32, a vertical guide bar 35 connecting the X-axis linear motors 31 and 32, and a pair of Y-axis linear motors 33. (34), the Y-axis linear motor (33) (34) and the horizontal guide bar (36) connecting the vertical guide bar (35) and the horizontal guide bar (36) pass through and the left eye camera (20) is installed. A moving block 37 is provided.

The pair of X-axis linear motors 31 and 32 are arranged side by side. The stator 31a of each X-axis linear motor 31, 32 is fixed to the stage 29, and the mover 31b is coupled to the stator 31a. The mover 31b is moved left and right by the operation of the X-axis linear motors 31 and 32.

And a pair of Y-axis linear motors 33 and 34 are arranged side by side. The stator 34a of each Y-axis linear motor 33, 34 is fixed to the stage 29, and the mover 34b is coupled to the stator 34a. By the operation of the Y-axis linear motors 33 and 34, the mover 34b is moved up and down.

The vertical guide bar 35 is connected to the mover 31b of the pair of X-axis linear motors 31 and 32, and the horizontal guide bar 36 is the mover of the pair of Y-axis linear motors 33 and 34 ( 34b).

In the moving block 37, a vertical sliding hole through which the vertical guide bar 35 passes is formed vertically, and a horizontal sliding hole through which the horizontal guide bar 36 passes is formed by penetrating left and right. And the left eye camera 20 is installed in the moving block 37. Of course, the right-eye camera 25 is installed in the moving block 38 constituting the second transfer unit 39. In addition, the left eye light source unit 40 to be described later is installed on the moving block 37 of the first transfer unit 30, and the right eye light source unit 45 to be described later is installed on the moving block of the second transfer unit 39.

When the X-axis linear motors 31 and 32 are operated by the control of the control unit 100, the moving blocks 37 move in either direction, and when the Y-axis linear motors 33 and 34 operate, the moving blocks (37) moves up and down in either direction. As described above, the present invention can freely move the left-eye camera 20 and the right-eye camera 25 to a required position by the X-Y transfer unit.

In addition, the left-eye camera and the right-eye camera can be installed on a moving block to adjust the viewing angle.

On the other hand, the present invention is preferably provided with a light source for irradiating light to the left and right eyes. The light source unit may include one light source or two light sources. When made of one light source, the light source unit is located at the center of the cover housing. In addition, in the case of two light sources, each of the left space part and the right space part is located one by one.

In the illustrated example, the light source unit is provided with two light sources to irradiate light to the left and right eyes of the subject, respectively. That is, the left-eye light source unit 40 for irradiating light to the left is installed in the left space unit 3, and the right-eye light source unit 45 for irradiating light to the right eye is installed in the right space unit 4. The left-eye light source unit 40 and the right-eye light source unit 45 are for determining the position of the light reflection point in the cornea by irradiating light to the left and right eyes.

The left-eye light source unit 40 and the right-eye light source unit 45 are not particularly limited in the installation position as long as they are capable of irradiating light with the eyes, but are preferably installed at positions capable of irradiating light in the frontal direction of the eyes.

In the illustrated example, the left-eye light source unit 40 is installed in the moving block 37 of the first transfer unit 30 so that it can be moved together with the left-eye camera 20, and the right-eye light source unit can be moved together with the right-eye camera 25. 45 is installed in the moving block 38 of the second transfer unit (39).

The left-eye light source unit 40 and the right-eye light source unit 45 may be formed of a light emitting diode installed on a substrate and a lens for focusing light of the light emitting diode, respectively. An infrared light emitting diode that generates infrared light as a light emitting diode can be used.

The control unit 100 may be installed inside the cover housing 1. Unlike this, the control housing 100 may be installed outside the cover housing 1 by being electrically connected to the cover housing 1.

The control unit 100 comprises a micro process and various driving circuits to control the operation of the present invention. For example, the control unit 100 controls on / off of the image output unit 10 and position control of the left image 11 and right image 13, operation of the left-eye camera 20 and the right-eye camera 25, and the first transfer unit ( 30) and the movement of the second transfer unit 39, the on-off of the left-eye light source unit 40 and the right-eye light source unit 45 are controlled.

In addition, the control unit 100 outputs the selected image to the left-eye image 11 and the right-eye image 13 through the image output unit 10, and various image images input from the left-eye camera 20 and the right-eye camera 25. Is analyzed and processed, and the angle of deviation is calculated and calculated from the processed video image to measure the angle of view. In addition, the control unit 100 may store the image images and various result values in the memory unit 120 and output them to an external device for display.

Meanwhile, the present invention may further include a power supply unit 110 for providing power, a memory unit 120 for storing data, a manipulation unit 130 for manipulation, and a communication unit 140 for communication with an external device. have.

The power supply unit 110 for providing power to the present invention may use a battery installed in the cover housing 1. In addition, commercial power may be used as the power supply unit 110, and in this case, the power supply cable may be used to connect the cover housing 1.

The memory unit 120 may be formed of various storages for storing various image data and numerical data. The memory unit 120 for storage may be a volatile memory, a non-volatile memory, and a hard disk that may be installed on the cover housing 1. In addition, the memory unit 120 may be a floppy disk, compact disk, USB (USB), or the like, which are present outside the cover housing.

The operation unit 130 may be provided outside the cover housing 1. The operation unit 130 may be provided as a key for setting a supported function including a power button or a touch panel.

The communication unit 140 is controlled by the control unit 100 to perform communication. The communication unit 140 may communicate in a wired or wireless manner. The wireless communication unit 140 may be constructed to perform wireless communication by a Bluetooth communication module supporting short-range wireless communication.

In addition, the present invention may be further provided with an external output unit for outputting the result value to the outside. The external output unit may be provided outside the cover housing. The external output unit is connected to the control unit wirelessly or wired to output the result. A computer, a TV, a small LCD display, a printer, and a mobile terminal can be used as the external output unit.

In addition, the present invention may be installed a speaker for voice guidance to the subject. The controller may request an appropriate posture or gaze direction from the subject through the speaker to measure the angle of view.

On the other hand, the automatic viewing angle measuring device according to another example of the present invention is shown in FIG.

The automatic viewing angle measurement apparatus illustrated in FIG. 8 further includes a first external camera 50 and a second external camera 55. The rest of the components are the same as the above-described embodiment.

Referring to FIG. 8, a first external camera 50 and a second external camera 55 are installed on the front surface of the cover housing 1. The first external camera 50 and the second external camera 55 are spaced apart from side to side and installed side by side.

The first external camera 50 is installed at a position corresponding to the left space part 3, and the second external camera 55 is installed at a position corresponding to the right space part 4. The first external camera 50 photographs the front of the cover housing 1 to obtain a first external image image, and the second external camera 55 photographs the front of the cover housing 1 to obtain a second external image image. To acquire.

The first external camera 50 and the second external camera 55 are preferably configured to adjust the convergence angle according to the viewing distance. For example, the viewing angle between the viewing direction of the first external camera 50 and the viewing direction of the second external camera 55 increases when looking closer, and the viewing direction of the first external camera 50 when looking far away The viewing angle formed by the viewing direction of the second external camera 55 decreases.

The first external image image photographed by the first external camera 50 is output as a left image by the control unit, and the second external image image photographed by the second external camera 55 is output as a right image by the control unit. The controller may output the first external image image and the second external image image in real time or store them in the memory unit and output the image later.

Since the subject looks at the first external image image through the left eye, and the second external image image looks at the right eye, the subject can see the front object as a three-dimensional image even while wearing the cover housing 1 on the face. Can be.

Meanwhile, an automatic viewing angle measuring apparatus according to another embodiment of the present invention is illustrated in FIGS. 9 to 11.

The illustrated automatic viewing angle measurement apparatus shows that the position of the camera and the image output unit can be freely adjusted using a beam splitter 60 and 65, which is a kind of spectrometer.

9 to 11, the left-eye camera 20 and the right-eye camera 25 are installed inside the front surface of the cover housing 1, and the image output unit 10 is inside the bottom surface of the cover housing 1. It is different from the embodiment of FIG. 2 in that it is installed.

The left beam splitter 60 is installed obliquely in the left space part 3, and the right beam splitter 65 is installed obliquely in the right space part 4.

The left image output through the image output unit 10 is reflected by the left beam splitter 60 and sent to the left eye of the subject, and the right image is reflected by the right beam splitter 65 and sent to the right eye of the subject. In addition, the left-eye camera 20 and the right-eye camera 25 are installed in front of both eyes of the subject to photograph the left and right eyes of the subject, respectively. Therefore, the present invention is illustrated, the left-eye camera 20 and the right-eye camera 25 photograph the left-eye and right-eye respectively from the front of both eyes of the subject, so that a more accurate viewing angle can be measured.

And, as shown, the image output unit may be installed inside the upper surface of the cover housing using the beam splitter, or the left eye camera and the right eye camera may be installed inside the bottom surface or inside the top surface of the cover housing.

The present invention of the wearable type described above may be implemented as a virtual reality (VR) device or an augmented reality (AR) device. Therefore, as long as the VR device or the AR device includes the technical configuration of the present invention, it is included in the embodiment of the present invention.

Hereinafter, a method for automatically measuring a viewing angle using the above-described automatic viewing angle measuring device will be described.

Strabismus is a visual impairment in which two eyes are not aligned and looking at different points. In the case of strabismus, when one eye faces the front, the other eye turns inward or outward, or turns upward or downward to deflect. Deviation angle is an objective measure of the degree of this deviation.

Fig. 12 conceptually shows a state in which both eyes of a normal person without strabismus obstructs an object.

Referring to FIG. 12, when the anatomical center of the eye is referred to as an optical axis, and a path of a gaze looking at an object is referred to as a visual axis, the optical axis and the visual axis do not necessarily coincide.

The optical axis can be represented by a line passing through the center of the cornea (or the center of the pupil) A and perpendicular to the surface of the cornea, and the visual axis is a line connecting the object (focal point) and the center of the retina (fovea centralis) at the node. It intersects the optical axis. Because the position of the central part of the macula, the center, is deviated from the center of the retina, the optical axis and the visual axis do not coincide. At this time, the angle formed by the optical axis and the visual axis is called an angel kappa. Therefore, if the optical axis and the visual axis coincide, the kappa angle is zero.

Most people have a kappa angle because the optical axis and the visual axis do not coincide. It can be classified as a positive kappa angle when the point of contact (B) between the visual axis and the cornea is away from the center (A) of the cornea to the inside (nose direction), and to the outside (ear direction) from the center (A) of the cornea. have. The illustrated example is a positive kappa angle since the point of contact B between the visual axis and the cornea is away from the center (A) of the cornea (in the nasal direction).

A large positive kappa angle looks like an exotropia and a large negative kappa angle looks like an exotropia. A normal person has a large amount of positive kappa angle, and ophthalmologically, a kappa angle of 5 degrees or less is considered normal.

Since the kappa angle is difficult to measure directly, it can be converted by measuring the linear distance between A (center of the cornea) and B (intersection of the visual axis and the cornea).

Fig. 13 is a schematic diagram for calculating the kappa angle of the right eye shown in Fig. 12.

Referring to FIG. 13, when the curvature of the cornea is neglected when a straight line Ln connecting A and B is drawn, it can be assumed that the straight line Ln is perpendicular to the optical axis. When the distance L ₀ between C (node) and A (center of the cornea) is known, θ _k can be obtained because tanθ _k = Ln / L ₀ . Here, θ _k means the kappa angle. The kappa angle is a numerical value indicating how far the visual axis is deviated from the optical axis. When the kappa angle is θ _k , the straight line distance between A and B is the deviation distance. In addition, although the distance L ₀ from the center of the cornea to the node differs slightly from person to person, on average, it can be seen as 7.14 mm.

When the deviation distance is 1mm, the kappa angle is about 8 °, and when converted into a prism diopter (Δ), it is about 14Δ. And when the deviation distance is 3mm, the kappa angle is about 22.8 °, and when converted into a prism diopter, it is about 42Δ. The relationship between the prism diopter and the kappa angle is Δ = 100 × tanθ _k .

When both eyes are normal, as shown in FIG. 12, the visual axis of the left and right eyes faces the object, so the gaze is fused in one place. In contrast, in the case of strabismus, the convergence ability does not exist or deteriorates so that the gaze does not fuse in one place.

Referring to FIG. 14, a state in which the left eye is normal and the right eye is exogenous is illustrated.

Normally, in a strabismus patient, when one object is viewed with two eyes, one eye normally looks at the object, while the other eye does not. If the eye that normally gazes at an object is referred to as the main eye, and the eye that cannot see the object is different from the main eye, the right eye is the right eye and the left eye is the eye eye. The visual axis in the left eye is facing the object, but the visual axis in the right eye is out of the object.

If the visual axis is assumed to be a virtual visual axis, assuming that the normal visual axis is normal, the visual angle means the degree of deviation of the visual axis from the virtual visual axis. Therefore, θ _s is the perspective angle.

To calculate the angle of view, the kappa angle is measured for the gaze, and the deviation angle is measured for the cyan. The kappa angle of the primary cyan and the deviation angle of the cyan can be obtained using a corneal reflection method, which will be described later.

The angle of view can be obtained by comparing the kappa angle of the master eye with the deviation angle of the eye.

Since the main eye is the left eye, the kappa angle, which is the angle that the main eye's visual axis forms with respect to the optical axis, is θ _k . In addition, the deviation angle of the cyan can be defined as an angle θ _d between the virtual visual axis and the optical axis.

In addition, the angle of view θ _s can be obtained by the difference between the kappa angle θ _k of the main cyan and the deviation angle θ _d of the cyan. Angle θ _m the visual axis and the optical axis of the sasian forms will be visible to be the same and each kappa θ _k in eye angle of deviation θ _s = θ _d -θ _k to be.

Also, although not shown, in the case of an inner strabismus, the strabismus angle can be obtained by adding the kappa angle of the master Xi'an and the deviation angle of the sassy. For example, in the case of internal strabismus, the strabismus angle θ _s = θ _d + θ _k to be.

Also, unlike the above, the angle of view can be obtained by comparing the angle of deviation between the angle of kappa and the angle of deviation of the angle. The kappa angle of the cyan can also be obtained using the corneal reflection method, which will be described later. Normally, the kappa angle of the cyan can be regarded as the same as the kappa angle of the cyan, but in rare cases, the kappa angle of the cyan and the cyan may be different.

When looking at an object with both eyes, the sight does not look at the object, but when looking at the object only with the sight, the subject sees the object. Therefore, it is possible to calculate the kappa angle by looking at the object only with the cyan and calculating the angle between the visual axis and the optical axis of the cyan.

A method for automatically measuring a viewing angle according to an example of the present invention will be described with reference to FIGS. 2 to 6.

The automatic angle of view measurement method of the present invention is largely composed of an image interval adjustment step, a discrimination step, and a calculation step. Hereinafter, each step will be described in detail.

1. Video interval adjustment step

For precise measurement of the viewing angle, the distance between the left image 11 and the right image 13 is adjusted according to the binocular distance of the subject.

The binocular distance means the distance between the center of the cornea in the left eye and the center of the cornea in the right eye. This is the same concept as the pupil-distance (PD).

The subject's binocular distance can be measured by a specialist using a separate measuring tool or an optician. In this case, when the measured binocular distance of the subject is input through the manipulation unit 130, the control unit 100 controls the image output unit 10 to determine the distance between the center of the left image 11 and the center of the right image 13. Adjust the binocular distance. Along with this, the control unit 100 may drive the first transfer unit 30 and the second transfer unit 39 to adjust the distance between the left-eye camera 20 and the right-eye camera 25 by the distance between both eyes.

And, as described above, the binocular distance of the subject can be measured using the left-eye camera 20 and the right-eye camera 25. For example, after the left eye is photographed with the left eye camera 20 while the cover housing 1 is worn on the face, and the right eye is photographed with the right eye camera 25, the position of the center of the cornea within the captured image of the left eye and the right eye It is possible to calculate the binocular distance by reading the position of the center of the cornea within the captured image.

2. Discrimination step

Next, the left eye and the right eye are photographed while the cover housing 1 is worn on the face to obtain a primary image, and the primary eye and the right eye are discriminated by comparing the corneal position changes of the left eye and the right eye from the primary image Perform the steps. Through the discrimination step, it is possible to determine which of the binocular eyes is the primary eye and which is the cyan eye.

Specifically, the determining step a) to obtain the first left-eye image by shooting the left eye looking at the left image while simultaneously outputting the left and right images and obtaining the first right-eye image by shooting the right eye looking at the right image. Step and b) In the state of outputting the left and right images alternately, when the left image is output, the left eye looking at the left image is photographed to obtain the second left eye image, and when the right image is output, the right eye looking at the right image is photographed. And obtaining a second right-eye image, and c) comparing corneal position changes between the first left-eye image and the second left-eye image, and comparing the corneal position change between the first right-eye image and the second right-eye image. .

(a) Article 1 left eye image  And Right eye image  Acquisition

To obtain the first left-eye image and the first right-eye image, the left image 11 and the right image 13 are simultaneously output through the image output unit 10 under the control of the control unit 100. The left image 11 and the right image 13 may be still images or videos.

Preferably, the left image and the right image may be images taken with a 3D camera. When two 2D images photographed from different angles are output as the left image and the right image, the subject can view the stereoscopic image.

In addition, as shown in FIG. 8, when the first external camera 50 and the second external camera 55 are provided, the first external image image photographed by the first external camera 50 is transmitted to the control unit 100. By this, the left image 11 is output in real time, and the second external image image captured by the second external camera 55 may be output in real time by the control unit 100 to the right image 13.

When the left image 11 and the right image 13 are output simultaneously, the left eye of the subject looks at the left image 11, and the right eye looks at the right image 13. At this time, the left eye looking at the left image 11 is taken with the left eye camera 20 to obtain the first left eye image, and the right eye looking at the right image is taken with the right eye camera 25 to obtain the second right eye image.

The obtained first left eye image and second right eye image are stored in the memory unit 120.

(b) Article 2 Left eye image  And Article 2 Right eye image  Acquisition

Next, a second left-eye image and a second right-eye image are acquired.

In order to obtain the second left-eye image and the second right-eye image, the left and right eyes are photographed while the left image 11 and the right image 13 are alternately output.

For example, when the left image 11 is output, the left eye is photographed with the left eye camera 20 to obtain a second left eye image. At this time, the right image is not output.

Then, the output of the left image 11 is stopped and the right image 13 is output. In this state, the right eye looking at the right image 13 is photographed with the right eye camera 25 to obtain a second right eye image. The acquired second left-eye image and second right-eye image are stored in the memory unit 120.

In addition, when acquiring the second left-eye image and the second right-eye image, in order to measure the largest deviation angle, the images of both eyes are alternately projected for a period of time, and then the second left-eye image and the second right-eye image can be obtained.

When one eye is covered, strabismus disorder can be known by changing the corneal position of the other eye. This is a typical cover test performed in an ophthalmology clinic.

The conventional cover test is performed while alternately covering one eye and looking at the gaze point with the other eye. On the other hand, the present invention has the effect of covering one eye by alternately outputting the left and right images, thereby avoiding the hassle of covering one eye as in the prior art. In addition, when implemented with an automated device as in the present invention, a separate configuration that covers one eye can be omitted, so that the structure can be simplified.

(c) Comparison of corneal position change

The control unit 100 loads the first left and right eyes images and the second left and right eyes images, which are the first photographed images stored in the memory unit 120, to determine whether or not a strabismus disorder is present, and if there is a strabismus disorder, it determines the primary and left eyesight.

In the case of a normal person without strabismus, both eyes always look at the object, whether they are looking at the object with one eye or only one eye. Therefore, there is no change in the position of the cornea.

However, if you have a strabismus disorder, when you look at the object with both eyes, the main eye looks at the object, but the eye does not look at the object. And when you look at an object with only the eyesight of two eyes, the eyesight looks at the object. Therefore, in the case of strabismus, a change in the position of the cornea occurs.

The position of the cornea moves in the direction of the ear in the case of internal strabismus and in the direction of the nose in the case of exotropia. And in the upper or lower sash, it moves down or up.

The control unit 100 analyzes the corneal position change of the left eye by comparing the first left eye image and the second left eye image through software, and analyzes the corneal position change of the right eye by comparing the first right eye image and the second right eye image. Determine whether there is a disability.

For example, if there is no change in the corneal position in both the left and right eyes, it is determined to be normal, and if the position of the cornea is changed in either the left or right eye, it is determined as a strabismus disorder.

In addition, when it is determined as a strabismus disorder, the primary eye and the secondary eye are discriminated based on which eye has a change in the position of the cornea. When the corneal position changes in the left eye, the left eye is the cyan eye and the right eye is the primary eye. And when the corneal position change of the right eye occurs, the right eye is the cyan and the left eye is the primary.

In addition, depending on the direction in which the change of position of the cyan has occurred, it can be classified into external exotropia, internal exotropia, superior strabismus, and lower strabismus.

On the other hand, strabismus can be divided into hyeonseong strabismus and latent strabismus (sister-in-law). Hyeonseong sashimi has poor fusion function, and when looking at an object with both eyes, one eye is displaced. In addition, the latent strabismus has a fusion function when looking at an object with both eyes, so that the strabismus is not normally revealed, but the blindfolded eye is shifted when covering one eye.

In the case of Hyeonseong strabismus, as described above, it is possible to discriminate it by changing the corneal position of the eye on which the image is output. However, in the case of latent copying, it cannot be determined by the above-described discrimination method, so it is determined by the following method.

In the state where the left and right images 11 and 13 are output at the same time, the left eye looking at the left image 11 is photographed to obtain the first left eye image, and the right eye looking at the right image 13 is taken to capture the first right eye. Acquire an image. Then, in the state where the left and right images 11 and 13 are alternately output, the right eye is photographed when the left image 11 is output to obtain a second right eye image, and the left eye is photographed when the right image 13 is output. 2 Acquire a left-eye image. Then, the corneal position change of the first left eye image and the second left eye image is compared, and the corneal position change of the first right eye image and the second right eye image is compared. As a result of comparison, when the position of the cornea changes in either the left eye or the right eye, it can be determined as latent radiation.

As described above, since the present invention has an effect of alternately covering both eyes by alternately outputting the left image and the right image, it is possible to photograph the corresponding eye in both the case where the image is output and the image is not output. Therefore, it is very easy to discriminate during latent radiation. On the other hand, the conventional cover test has a problem in that it is difficult to discriminate at the time of latent radiation because it cannot grasp the change in the corneal position of the blindfolded eye because it covers the eye with a shield.

3. Step angle calculation

When it is determined as a strabismus disorder, a calculation step is performed to calculate the strabismus angle from the degree of deviation of the strabismus.

In the calculating step, the angle of view can be calculated by comparing the kappa angle obtained from the main cyan or the cyan with the deviation angle obtained from the cyan. The kappa angle of the main cyan, the kappa angle of the cyan, and the deviation angle of the cyan can be obtained by corneal reflection.

The corneal reflection method is a method of measuring the extent to which a point (hereinafter referred to as a corneal reflection point) of the cornea where the light is reflected by shining light from the front of the face is displaced from the center of the cornea.

Examples of corneal reflection points in both eyes are shown in FIGS. 15 to 17. FIG. 15 is an image of a normal person, FIG. 16 is a binocular image of a patient with an exotropia, and FIG. 17 is a binocular image of a patient with exotropia. In FIG. 15 to FIG. 17, a portion indicated by a white circle on the cornea is a corneal reflection point.

15, in the case of a normal person, the positions of the corneal reflection points are formed in the vicinity of the corneal center in both the left and right eyes. In normal people, most of the corneal reflex points are formed slightly away from the center of the cornea toward the nose. Ophthalmologically, if the kappa angle is 5 degrees or less, it is considered normal, so if the distance from the corneal center is less than 0.62 mm, it is normal. In normal humans, corneal reflex points are present in the path of the visual axis. Therefore, the intersection point between the visual axis and the surface of the cornea is the corneal reflection point. The corneal reflection point means B in FIG. 12.

In addition, FIG. 16 shows a case in which the left eye is the main eye and the right eye is the exotropia. In the left eye, the corneal reflection point is formed near the center of the cornea, while the right eye can see that the corneal reflection point is biased from the center of the cornea toward the ear.

And 17 shows the case where the left eye is the main eye and the right eye is the foreign eye. In the case of the left eye, the corneal reflection point is formed near the center of the cornea, while the right eye can confirm that the corneal reflection point is biased from the center of the cornea toward the nose.

In this way, the light is shined from the front of the face, and at this time, the degree of deviation of the cyan can be measured through an image (corneal reflection image) of both eyes.

As an example, the calculating step includes a) obtaining the main corneal reflex image and the cyan reflex corneal image by shooting the main cyan and the cyan with light on the main and the cyan, and b) the main focus through the main corneal reflex image. Calculating the kappa angle of the primary eye by measuring the distance between the center of the cornea and the reflection point generated in the cornea, and c) measuring the distance between the center of the cornea and the reflection point generated in the cornea in the cyan eye through the corneal reflection image of the cyan eye. And calculating d) the angle of view of the cyan by comparing the kappa angle of the main cyan with the deviation angle of the cyan.

(a) Corneal reflection image  Acquisition

The light shines on the Xian and Xian. To this end, the control unit 100 simultaneously operates the left-eye light source unit 40 and the right-eye light source unit 45 to generate light from the left-eye light source unit 40 and the right-eye light source unit 45. At this time, the subject should look at the light. Light is reflected on both eyes of the subject to form a corneal reflection point. In this state, the left eye is photographed with the left eye camera 20 to obtain the corneal reflection image of the left eye, and the right eye is photographed with the right eye camera 25 to obtain the corneal reflection image of the right eye. Of the corneal reflection images of the left and right eyes, the image corresponding to the main eye is the main corneal reflection image, and the image corresponding to the right eye is the cyan corneal reflection image.

Examples of various corneal reflection images are shown in FIGS. 18 to 21.

18 and 19 are images of corneal reflection images obtained by photographing both eyes of a subject whose left eye is the main eye and the right eye is the sad eye.

Referring to FIG. 18, it can be seen that the gaze is formed inside the face of the right eye compared to the left eye, which is the primary eye, and accordingly, the center of the cornea of the right eye is positioned toward the nose from the corneal reflection point. So let the right eye die.

In FIG. 19, it can be seen that the right eye has a gaze formed outside the face, and the corneal center of the right eye is biased toward the ear from the corneal reflection point compared to the left eye. Therefore, right eye is foreign affair.

20 and 21 are images of corneal reflection images obtained by photographing both eyes of a subject whose right eye is the main eye and the left eye is the cyan eye.

Referring to FIG. 20, it can be seen that the gaze is formed inside the face of the left eye compared to the right eye, which is the primary eye, and accordingly, the center of the cornea of the left eye is positioned toward the nose from the corneal reflection point. Therefore, let's leave the left eye.

And in FIG. 21, it can be seen that the gaze is formed on the left eye outside the face, compared to the right eye, which is the primary eye, and thus the corneal center of the left eye is biased toward the ear from the corneal reflection point. Therefore, the left eye is a foreign affair.

The greater the degree of deviation of the cyanide, the farther the center of the cornea is from the corneal reflection point. Referring to FIG. 22, a state in which the right eye is the main eye and the left eye is the exotropia is shown. In the case of (a), the corneal reflex point in the left eye is formed near the pupillary, in the case of (b) the corneal reflex point is formed between the pupillary and the corneal limbus, and in the case of (c) the corneal reflex point is formed in the vicinity of the corneal rim. .

(b) Dominant Kappa angle  Calculation

Next, the kappa angle of the cyan is calculated by measuring L _n , which is the distance between the corneal reflection point of the cyan and the center of the cornea, through the corneal reflection image.

When the left eye is the main eye and the right eye is the external vision, L _n and the kappa angle of the main eye can be obtained as follows.

23, the control unit 100 detects the positions of the corneal center A and the corneal reflection point B, and then calculates the distance L _n between the corneal center A and the corneal reflection point B. do.

In order to detect the corneal center (A) from the obtained corneal reflection image, circular edge detection (CED), canny boundary detection, ellipse boundary detection, etc. may be applied. Also, in order to detect the corneal reflection point (B) in the obtained corneal reflection image, accurate location detection is possible in software using techniques such as binarization and component labeling.

Through the detected corneal center A and the corneal reflection point B, the controller 100 calculates the distance L _n between the corneal center A and the corneal reflection point B. And the calculated L _n Based on the value, the control unit 100 calculates the kappa angle θ _{k of} the main cyan. Since tanθ _k = Ln / L ₀ , the deviation angle (θ _k ) = tan ^-1 (Ln / L ₀ ) can be obtained.

(c) Sassian Deflection angle  Calculation

Next, the deviation angle of the cyan is calculated by measuring L _s , which is the distance between the corneal reflection point of the cyan and the center of the cornea, through the corneal reflection image of the cyan.

If the left eye is the primary eye and the right eye is the external exotropia, the Ls and deviation angles of the lateral eye can be obtained as follows.

24, the control unit 100 detects the positions of the corneal center A and the corneal reflection point B, and then calculates the distance Ls between the corneal center A and the corneal reflection point B. .

The control unit 100 calculates a distance Ls between the center A of the cornea and the corneal reflection point B through the detected center of the cornea and the corneal reflection point. Then, based on the calculated Ls value, the control unit calculates the deviation angle (θ _d ) of the cyan. Since the deflection angle tanθ _d = Ls / L ₀ , the deflection angle (θ _d ) = tan ^-1 (Ls / L ₀ ) can be obtained.

(d) Perspective  Calculation

Next, the perspective angle of the cyan is calculated by comparing the kappa angle of the master cyan and the deviation angle of the cyan.

Considering that almost all people are positive kappa angles, in the case of external strabismus, the deviation angle of the sassy is minus the kappa angle of the lord's eye. That is, in the case of external strabismus, the strabismus angle θ _s = θ _d -θ _k to be. In addition, in the case of internal strabismus, the deviation angle of strabismus plus kappa angle of the plesidian is the strabismus angle. That is, in the case of an internal strabismus, the angle of view θ _s = θ _d + θ _k to be.

As described above, the present invention can calculate a viewing angle θ _s using a photographed image of both eyes and a corneal reflection method.

On the other hand, it is needless to say that the angle of view can be calculated by calculating the kappa angle of the cyan and then comparing the deviation angle of the cyan.

For example, a first cyan image of a corneal reflection is obtained by photographing a cyan image with only the cyan light. If you only shine light on Sasian, Sasian watches the light. The kappa angle of the cyan is calculated by measuring the distance between the center of the cornea and the reflection point generated in the cornea of the cyan through the first corneal reflection image. Next, the second cyan is a corneal reflection image is obtained by photographing the cyan with the light shining on the primary and the cyan. If both the master and the target are looking at the light at the same time, the target is biased. The deviation angle of the cyan is calculated by measuring the distance between the center of the cornea and the reflection point generated in the cornea of the cyan through the second corneal reflection image. As described above, the kappa angle and the deviation angle of the cyan can be calculated, and then the kappa angle and the deviation angle can be compared to calculate a perspective angle.

4. Verification Stage

Meanwhile, the present invention may further perform a verification step of verifying whether the calculated perspective angle is correct. This is to ensure that the kappa angles of the left and right eyes are different, or that it can cope with rare strabismus abnormalities such as ARC (abnormal retina response).

The verification step verifies the angle of view through whether or not there is a change in the position of the cornea of the cyan, after placing one image corresponding to the cyan, in accordance with the visual axis of the cyan. If the angle of view calculated through the verification step is not correct, the angle of view is corrected and re-verified. Re-verification can be performed repeatedly until the angle of view is correct.

Specifically, the verification step comprises: a) moving any one image position corresponding to the cyan among the left and right images by a movement value calculated from the perspective angle, and b) a second photographed image of the left and right eyes of the subject And comparing whether the image moved through the positional change of the cornea corresponding to the strabismus corresponds to the axial axis of the strabismus.

(a) Moving the video position

The movement value of the image is calculated to confirm the perspective angle.

The image moves the side corresponding to the cyan. For example, if the left eye is the right eye, the left image 11 is moved, and if the right eye is the right eye, the right image 13 is moved. The image may be moved in the left-right direction or up-down direction according to the deviation direction of the cyan.

The shift value is calculated from the perspective angle. The control unit 100 calculates a movement value from the perspective angle in consideration of the distance between the image and the eye, and then controls the image output unit 10 to move the position of any one of the left and right images 11 and 13 Move as much.

In addition, the left-eye camera 20 or the right-eye camera 25 is moved along with the movement of the image. When moving the left image 11, the left-eye camera 20 moves the same distance in the same direction, and when moving the right image 13, the right-eye camera moves the same distance in the same direction. The left-eye camera 20 and the right-eye camera 25 are moved through the first and second transfer units 30 and 39 controlled by the control unit 100.

If the calculated perspective angle is correct, the position of the image after the movement coincides with the visual axis of the cyan. Also, if the calculated angle of view is not correct, the position of the image after movement does not coincide with the visual axis of the cyan.

(b) Comparison of strabismus corneal position changes

After moving the image on the side corresponding to the strabismus, the strabismus corneal position is compared from the second captured image of the subject's left and right eyes to check whether the strabismus angle is correct.

To this end, the left eye looking at the left image 11 is photographed with the left eye camera 20 while simultaneously outputting the left and right images 11 and 13 to obtain a third left eye image, and the right eye looking at the right image 13 Is photographed with the right eye camera 25 to obtain a third right eye image.

Then, while outputting the left and right images 11 and 13 alternately, when the left image 11 is output, the left eye facing the left image 11 is photographed with a left eye camera to obtain a fourth left eye image, and the right image 13 ) Outputs the right eye looking at the right image 13 with the right eye camera 25 to obtain a fourth right eye image.

As described above, the 3rd left and right eye images, the 4th left and right eye images are obtained as the second photographed image, and the position of the cornea is detected by comparing the positions of the cornea shown in the second photographed image.

If the calculated perspective angle is correct, the position of the image after the movement coincides with the visual axis of the cyan. Therefore, there is no change in the corneal position of the cyan. And if the calculated angle of view is not correct, the position of the image after movement does not coincide with the visual axis of the cyan. Therefore, a change in the corneal position of the cyanide occurs.

If the left eye is the left eye, the cornea positions of the third left eye image and the fourth left eye image are compared, and when the right eye is the right eye eye, the cornea positions of the third right eye image and the fourth right eye image are compared.

As a result of comparison, if there is no change in the position of the cornea, it means that the perspective angle calculated in the above calculation step is correct. Accordingly, the angle of view calculated in the calculation step can be confirmed as the final angle of view of the subject.

And if there is a change in the position of the cornea, it means that the angle of view calculated in the above calculation step is not correct. In this case, in order to recalculate the exact angle of view, the step of re-validating after correcting the angle of view calculated in the calculation step is additionally performed.

5. Re-validation stage

The re-validation step includes a) analyzing the positional change of the cornea corresponding to the strabismus from the second photographed image to obtain a correction amount of the strabismus angle, and b) which corresponds to the strabismus among the left and right images by the movement value calculated from the correction And moving the position of one image, and c) comparing the change in the position of the cornea corresponding to the cyan eye from the third image captured by the subject's left and right eyes.

(a) Perspective  Correction amount calculation

The correction amount (Δθ _s ) of the angle of view is obtained from the second photographed image.

For example, when the cyan is the left eye, the position change value Lc of the cornea is first obtained by comparing the corneal positions of the third left eye image and the fourth left eye image. The position change value of the cornea can be calculated as the distance between the center of the cornea shown in the third left eye image and the center of the cornea shown in the fourth left eye image.

When the position change value (Lc) of the cornea is obtained, it is possible to calculate the angle of view correction amount (Δθ _s ). For example, tan (Δθ _s ) = Lc / L ₀ . Where L ₀ is Eyeball It is the distance between the node (C) and the center (A) of the cornea.

The controller 100 calculates a movement value from the angle of view correction amount (Δθ _s ) in consideration of the distance between the image and the eye, and then controls the image output unit 10 to the left and right images 11 and 13 to the cyan field. Any one of the corresponding video positions is moved by the moving value. At this time, if the moving direction of the image is the same as the direction in which the right angle is biased, the angle of view correction amount (Δθ _s ) is a + value, and if the moving direction of the image is opposite to the direction in which the right angle is biased, the angle of correction (Δθ _s ) is- .

(b) Comparison of strabismus corneal position changes

After moving the image corresponding to the strabismus by a viewing angle correction amount (Δθ _s ), the strabismus corneal position change is compared from the 3 rd image captured by the subject's left and right eyes.

To this end, while outputting the left and right images 11 and 13 simultaneously, the left eye looking at the left image 11 is photographed with the left eye camera 20 to obtain a fifth left eye image, and the right eye looking at the right image 13 Is photographed with the right eye camera 25 to obtain a fifth right eye image.

And while outputting the left and right images 11 and 13 alternately, when the left image 11 is output, the left eye facing the left image 11 is photographed with the left eye camera 20 to obtain a sixth left eye image, and the right When outputting the image 13, the right eye looking at the right image 13 is photographed with the right eye camera 25 to obtain a sixth right eye image.

As above, the 5th left and right eye images, the 6th left and right eye images are obtained as the 3rd shooting image, and then the position of the cornea is detected by comparing the positions of the cornea shown in the 3rd shooting image.

If the calculated perspective angle correction amount (Δθ _s ) is correct, the position of the image after movement coincides with the visual axis of the cyan. Therefore, there is no change in the corneal position of the cyan. Also, if the calculated angle correction amount (Δθ _s ) is not correct, the position of the image after the movement does not coincide with the visual axis of the cyan. Therefore, a change in the corneal position of the cyanide occurs.

If the right eye is the left eye, the cornea positions of the fifth left eye image and the sixth right eye image are compared, and if the right eye is the right eye, the cornea positions of the fifth right eye image and the sixth right eye image are compared.

As a result of comparison, if there is no change in the position of the cornea, it means that the angle of correction (Δθ _s ) is correct. Accordingly, the corrected viewing angle is calculated by calculating the corrected viewing angle (Δθ _s ) into the viewing angle (θ _s ) calculated in the calculation step.

For example, the angle of view correction (Δθ)_s) Is positive, the corrected angle of view is θ_s + Δθ_s to be. And the angle of view correction (Δθ)_s) Is 1, the corrected angle of view is θ_s- Δθ_sto be.

The corrected angle of view can be confirmed as the final angle of view of the subject.

And if there is a change in the position of the cornea, it means that the above angle correction amount (Δθ _s ) is not correct.

In this case, in order to recalculate the correct angle of view, the angle of view correction is calculated again from the third image, and from this, the moving value of the image corresponding to the cyan is calculated, the position of the image is moved by the moving value, and then the subject's left eye and After photographing the right eye, the corneal position is compared.

By repeating the above revalidation process until no corneal position change occurs, the present invention can measure an accurate angle of view.

As described above, the present invention has been described with reference to one embodiment, but this is only exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true protection scope of the present invention should be defined only by the appended claims.

1: Cover housing 10: Video output unit
11: Left image 13: Right image
20: left eye camera 25: right eye camera
30: first transfer section 39: second transfer section
40: left eye light source portion 45: right eye light source portion
100: control unit 110: power supply unit
120: memory unit 130: operation unit
140: communication unit

Claims (21)

A main body including a cover housing and a blocking member installed inside the cover housing to separate the inside of the cover housing into a left space part corresponding to the left eye and a right space part corresponding to the right eye;
An image output unit installed on the cover housing and separating and outputting a left image visible to the left eye portion and a right image visible to the right eye portion of the left space portion;
A photographing unit installed on the main body and photographing the left and right eyes facing the image output unit;
A light source unit installed on the main body and irradiating light to the left and right eyes;
And a control unit for adjusting the position of the left image and the right image in the vertical or horizontal direction, and calculating the degree of deviation of the cyan image from the captured image acquired through the photographing unit.
The photographing unit is installed on the left space unit, a left-eye camera photographing the left eye, a right-eye camera installed on the right-space photographing the right eye, and camera moving means for independently moving the left-eye camera and the right-eye camera, respectively. Equipped with,
The camera moving means includes a first transfer unit for moving the left-eye camera up and down or left and right, and a second transfer unit for moving the right-eye camera up and down or left and right,
The light source unit is installed on the first transport unit so as to be movable with the left-eye camera, and the left-eye light source unit that irradiates light on the left-hand side and is installed on the second transport unit to enable movement with the right-eye camera and irradiates light on the right-eye. Automatic viewing angle measuring device, characterized in that it comprises a right-eye light source portion. delete delete delete According to claim 1, wherein the image output unit automatic viewing angle device, characterized in that provided as a display for separating the left and right images from the left and right images. The apparatus of claim 1, wherein the image output unit is provided with a left-eye display outputting the left image and a right-eye display outputting the right image. 7. The automatic viewing angle measuring apparatus according to claim 5 or 6, wherein the display is formed of a curved surface. delete delete The method of claim 1, wherein the first external camera is installed on the main body to obtain a first external image image by photographing the front of the cover housing, and the second external image installed on the main body to photograph the front of the cover housing A second external camera for acquiring an image is further provided,
Automatic viewing angle measuring device, characterized in that the first external image image is output to the left image and the second external image image is output to the right image through the image output unit. In the automatic viewing angle method performed in the automatic viewing angle measuring device,
The automatic viewing angle measuring apparatus includes a main body including a cover housing and a blocking member installed inside the cover housing to separate the inside of the cover housing into a left space part corresponding to the left eye and a right space part corresponding to the right eye; An image output unit installed on the cover housing and separating and outputting a left image visible to the left eye portion and a right image visible to the right eye portion of the left space portion; A photographing unit installed on the main body and photographing the left and right eyes facing the image output unit; A light source unit installed on the main body and irradiating light to the left and right eyes; And a control unit for adjusting the position of the left image and the right image in the vertical or horizontal direction, and calculating the degree of deviation of the cyan image from the captured image acquired through the photographing unit.
The photographing unit is installed on the left space unit, a left-eye camera photographing the left eye, a right-eye camera installed on the right-space photographing the right eye, and camera moving means for independently moving the left-eye camera and the right-eye camera, respectively. Equipped with,
The camera moving means includes a first transfer unit for moving the left-eye camera up and down or left and right, and a second transfer unit for moving the right-eye camera up and down or left and right,
The light source unit is installed on the first transport unit so as to be movable with the left-eye camera, and the left-eye light source unit that irradiates light on the left-hand side and is installed on the second transport unit to enable movement with the right-eye camera and irradiates light on the right-eye. It is provided with a right-eye light source to do,
An image interval adjusting step of controlling the image output unit to adjust the distance between the left image and the right image according to the subject's binocular distance;
When the cover housing is worn on the subject's face, the control unit compares the corneal position changes of the left and right eyes from the primary photographed image of the left and right eyes of the subject with the left eye camera and the right eye camera. A discrimination step of discriminating a cyanide;
And a calculation step of obtaining a degree of deviation of the strabismus determined in the discriminating step from the control unit and calculating a strabismus angle. The method of claim 11, further comprising a verification step of verifying whether the angle of view is correct after the calculating step. The method of claim 12, wherein the verifying step comprises: a) moving any one of the left and right images corresponding to the cyan by the movement value calculated from the perspective angle; and b) the left eye of the subject. And comparing whether the image moved through the positional change of the cornea corresponding to the right eye from the second captured image taken with the right eye matches the visual axis of the right eye. The method of claim 13, further comprising: a re-validation step of correcting and re-validating the angle of view when there is a change in the position of the cornea corresponding to the cyan in the verification step. 15. The method of claim 14, wherein the re-validation step comprises: a) analyzing the positional change of the cornea corresponding to the cyan from the secondary photographed image to obtain a correction amount of the perspective angle, and b) a movement value calculated from the correction amount Moving the position of any one of the left and right images corresponding to the strabismus as much as possible, and c) comparing the change in the position of the cornea corresponding to the strabismus from the third image taken of the left and right eyes of the subject. Automated perspective angle measurement method comprising the step of. 16. The method of claim 15, wherein the corrected angle of view is calculated by calculating the corrected angle of view by calculating the correction amount in the angle of view when there is no change in the position of the cornea corresponding to the cyan in the third photographed image. The method of claim 11, wherein the determining step comprises: a) taking the left eye looking at the left image while simultaneously outputting the left and right images to obtain a first left eye image, and taking a right eye looking at the right image; Obtaining a first right-eye image, and b) photographing the left-eye viewing the left-side image when outputting the left-side image while alternately outputting the left and right-side images to obtain a second left-eye image, and the right-side image. Obtaining a second right-eye image by photographing the right eye looking at the right image upon output of, and c) comparing the corneal positional change between the first left-eye image and the second left-eye image, and comparing the first right-eye image with And comparing the corneal position change of the second right-eye image. The method of claim 17, wherein the determining step outputs the first external image image obtained by photographing the front of the subject as the left image, and the second external image image obtained by photographing the front of the subject is the right image. Automatic angle of view measurement method characterized in that the output. 12. The method of claim 11, wherein the calculating step calculates a perspective angle by comparing the kappa angle obtained from the primary cyan or the cyan with the deviation angle obtained from the cyan. 20. The method of claim 19, wherein the calculating step comprises: a) obtaining the main corneal reflex image and the cyan retinal corneal image by photographing the main cyan and the cyan with light on the main cyan and the cyan; b) Calculating a kappa angle of the main cyan by measuring a distance between the center of the cornea and a reflection point generated in the cornea of the main cyan through a corneal reflection image of the cyan, and c) occurring in the cornea of the cyan through the corneal reflection image of the cyan Comprising the steps of calculating the deviation angle of the cyan by measuring the distance between the center of the cornea and the reflected point, and d) comparing the kappa angle of the primary cyan and the deviation angle of the cyan, and calculating the angle of deviation of the cyan. Automatic angle of view measurement method. The method of claim 11, wherein the determining step comprises: a) taking the left eye looking at the left image while simultaneously outputting the left and right images to obtain a first left eye image, and taking a right eye looking at the right image; Acquiring a first right eye image, and b) photographing the right eye when outputting the left image and alternately outputting the left and right images to obtain a second right eye image, and photographing the left eye when outputting the right image. Acquiring a second left-eye image, and c) comparing corneal positional changes of the first left-eye image and the second left-eye image, and comparing corneal positional changes of the first right-eye image and the second right-eye image. Method for automatically measuring a perspective angle, characterized in that it comprises a step.

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