Alignment adjustment method and system

Abstract

The invention discloses an alignment adjusting method and system, an applied device comprises a reflecting element, the reflecting element reflects incident light to enable formed emergent light to be incident to a detected human eye, and the reflecting element can rotate around a rotating shaft. The method comprises the following steps: when a reflection element is in an initial state, acquiring an image of a detected human eye to obtain a first image, and enabling the vertical direction of the image to be perpendicular to a rotating shaft when the image is acquired; the vertical distance between the measured human eye and the reference vertical position in the first image is obtained, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained according to the vertical distance, the reflection element rotates around the rotating shaft from the initial state according to the first angle, and formed emergent light is made to be incident to the measured human eye. According to the invention, the image of the detected human eye is obtained, and the reflection element is rotated according to the position of the detected human eye in the obtained image, so that the formed emergent light is aligned to the detected human eye and is incident to the detected human eye, manual adjustment is not needed, and the device is more convenient and intelligent.

Description

Technical Field

[0001] The present invention relates to the field of image application, and in particular to an alignment adjustment method and system. Background Art

[0002] In order to adapt to the different eye heights of various people being tested, an adjustable reflector is set on the outgoing light path of the vision chart. By adjusting the vertical angle of the reflector, the sight mark can be seen by the observer's eyes.

[0003] In the prior art, there are three main adjustment methods: the first is that the person being measured adjusts the device by rotating the adjustment hand wheel on the device so that the person can observe the sight mark, but the mechanical hand wheel has a slow adjustment speed and needs to be adjusted close to the device. After the adjustment is completed, it returns to the working position. After returning, there may be a deviation from the previously adjusted height, resulting in secondary adjustment. The second is that the person being measured uses a remote control to control the motor in the device to adjust the reflector at the working position, and the motor is controlled in gears according to a certain step length. In actual use, too many gears will make the adjustment time longer, and too few gears will make the adjustment too much, and secondary adjustment is also required. The third is that the optometrist uses a remote control placed at the height of the person being measured's eyes to aim at the eye chart to emit an infrared signal. The eye chart receives the infrared signal, calculates the angle and position of the signal, and controls the motor to adjust the reflector to the corresponding angle. This method requires the optometrist to place the remote control at the height of the person being measured's eyes to emit an infrared signal as a guide signal, which is not convenient or intelligent enough to use. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide an alignment adjustment method and system, which does not require manual adjustment and is more convenient and intelligent.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An alignment adjustment method is applied to a device including a reflective element, the reflective element is used to reflect incident light incident to the reflective element so that the formed outgoing light is incident to a human eye under test, the reflective element can rotate around a rotation axis, the rotation axis is perpendicular to a plane where an optical axis of the incident light intersects with an optical axis of a reflected light when the incident light is incident on the reflective element;

[0007] The alignment adjustment method comprises:

[0008] When the reflective element is in an initial state, an image is acquired for the human eye to obtain a first image, and when the image is acquired for the human eye to obtain, the vertical direction of the image is perpendicular to the rotation axis;

[0009] Obtaining a vertical distance from the measured human eye to a reference vertical position in the first image, obtaining a first angle of a current actual position of the measured human eye relative to a preset actual position according to the vertical distance, and rotating the reflective element from the initial state around the rotation axis according to the first angle so that the generated outgoing light is incident on the measured human eye;

[0010] The vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image;

[0011] When the reflective element is in the initial state, the outgoing light is incident on the preset actual position. When the human eye to be measured is in the preset actual position, the human eye to be measured is in the reference vertical position in the image obtained for the human eye to be measured. The first angle of the current actual position of the human eye to be measured relative to the preset actual position is the direction of the outgoing light formed when it is incident on the current actual position, relative to the angle of the direction of the outgoing light formed when it is incident on the preset actual position.

[0012] Optionally, obtaining, according to the vertical distance, a first angle of the current actual position of the measured human eye relative to a preset actual position includes:

[0013] According to the vertical distance and the first preset relationship, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained, wherein the first preset relationship is obtained by pre-calibration, and the first preset relationship describes the relationship between the actual position of the measured human eye relative to the preset actual position, the first angle, and the vertical distance from the measured human eye to the reference vertical position in the image obtained for the measured human eye.

[0014] Optionally, obtaining, according to the vertical distance, a first angle of the current actual position of the measured human eye relative to a preset actual position includes: obtaining, according to the vertical distance and a first preset relationship, the first angle of the current actual position of the measured human eye relative to a preset actual position;

[0015] Acquire an image of the human eye under test through an image acquisition component, wherein an entrance pupil of the image acquisition component is located on the rotation axis, and a vertical direction of an image plane of the image acquisition component is perpendicular to the rotation axis;

[0016] Obtaining the first preset relationship includes:

[0017] The image acquisition component is enabled to acquire an image of an object plane to obtain a second image, wherein the object plane is provided with a plurality of object points having different vertical positions, and the plurality of object points include preset object points;

[0018] For any of the object points, a second angle of the object point relative to the preset object point is obtained, and a vertical distance from an image point corresponding to the object point to an image point corresponding to the preset object point in the second image is obtained, wherein the image point corresponding to the preset object point in the second image is at the reference vertical position, and the second angle of the object point relative to the preset object point is an angle of a direction in which a light ray of the object point enters the image acquisition component through the entrance pupil and is incident on the image plane relative to a direction in which a light ray of the preset object point enters the image acquisition component through the entrance pupil and is incident on the image plane;

[0019] The first preset relationship is obtained according to the second angles and vertical distances corresponding to the multiple object points.

[0020] Optionally, the first preset relationship includes a first sub-preset relationship and a second sub-preset relationship;

[0021] The first sub-preset relationship describes the relationship between the first angle of the actual position of the tested human eye relative to the preset actual position and the vertical distance from the tested human eye to the reference vertical position in the image obtained for the tested human eye when the tested human eye is higher than the reference vertical position, wherein the first angle is the angle of the direction of the generated outgoing light when incident on the actual position, relative to the direction of the generated outgoing light when incident on the preset actual position, rotated clockwise / counterclockwise;

[0022] The second sub-preset relationship describes the relationship between the first angle of the actual position of the tested human eye relative to the preset actual position and the vertical distance from the tested human eye to the reference vertical position in the image obtained for the tested human eye when the tested human eye is lower than the reference vertical position, wherein the first angle is the angle of the direction of the generated outgoing light when incident on the actual position, rotated counterclockwise / clockwise relative to the direction of the generated outgoing light when incident on the preset actual position;

[0023] Correspondingly, obtaining a first angle of the current actual position of the measured human eye relative to a preset actual position according to the vertical distance, and rotating the reflective element around the rotation axis from the initial state according to the first angle so that the formed outgoing light is incident on the measured human eye includes:

[0024] If the measured human eye is higher than the reference vertical position in the first image, obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance and the first sub-preset relationship, and rotating the reflective element clockwise / counterclockwise around the rotation axis from the initial state according to the first angle, so that the generated outgoing light is incident on the measured human eye;

[0025] If the measured human eye is lower than the reference vertical position in the first image, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained according to the vertical distance and the second sub-preset relationship, and the reflective element is rotated counterclockwise / clockwise around the rotation axis from the initial state according to the first angle so that the formed output light is incident on the measured human eye.

[0026] Optionally, when the human eye under test is at the preset actual position, the human eye under test is at a vertical position corresponding to the center of the image acquired for the human eye under test.

[0027] Optionally, rotating the reflective element from the initial state around the rotation axis according to the first angle includes:

[0028] The reflective element is driven to rotate around the rotation axis by a motor, and the number of rotation steps of the motor is obtained according to the first angle and the second preset relationship, so that the motor drives the reflective element to rotate around the rotation axis according to the number of rotation steps.

[0029] An alignment adjustment system comprising:

[0030] A reflective element, used for reflecting the incident light incident on the reflective element so that the formed outgoing light is incident on the eye of the person being measured, wherein the reflective element can rotate around a rotation axis, and the rotation axis is perpendicular to a plane where an optical axis of the incident light intersects with an optical axis of the reflected light when the incident light is incident on the reflective element;

[0031] An image acquisition component, used for acquiring an image of the human eye under test, wherein the image plane of the image acquisition component is vertically perpendicular to the rotation axis;

[0032] a control device, which is in communication with the reflective element and the image acquisition component, and is used to control the image acquisition component to acquire an image of the human eye to be measured when the reflective element is in an initial state, to obtain a first image, and further obtain a vertical distance from the human eye to be measured to a reference vertical position in the first image, and obtain a first angle of a current actual position of the human eye to be measured relative to a preset actual position according to the vertical distance, and rotate the reflective element around the rotation axis from the initial state according to the first angle, so that the formed outgoing light is incident on the human eye to be measured;

[0033] The vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image;

[0034] When the reflective element is in the initial state, the outgoing light is incident on the preset actual position. When the human eye to be measured is in the preset actual position, the human eye to be measured is in the reference vertical position in the image obtained for the human eye to be measured. The first angle of the current actual position of the human eye to be measured relative to the preset actual position is the direction of the outgoing light formed when it is incident on the current actual position, relative to the angle of the direction of the outgoing light formed when it is incident on the preset actual position.

[0035] Optionally, the entrance pupil of the image acquisition component is located on the rotation axis.

[0036] Optionally, when the reflective element is in the initial state, the optical axis of the emitted light is parallel to the optical axis of the image acquisition component.

[0037] Optionally, the image acquisition component is arranged on one side of the reflective element;

[0038] The image acquisition component is fixed, or the image acquisition component rotates synchronously with the reflective element.

[0039] It can be known from the above technical scheme that the alignment adjustment method provided by the present invention is applied to a device including a reflective element, the reflective element is used to reflect the incident light incident to the reflective element, so that the formed outgoing light is incident to the eye of the person being measured, and the reflective element can rotate around a rotation axis, and the rotation axis is perpendicular to the plane where the optical axis of the incident light intersects with the optical axis of the reflected light when the incident light is incident on the reflective element. The method includes: when the reflective element is in an initial state, an image of the eye of the person being measured is acquired to obtain a first image, and when the image of the eye of the person being measured is acquired, the vertical direction of the image is perpendicular to the rotation axis; the vertical distance from the eye of the person being measured to the reference vertical position in the first image is acquired, and according to the vertical distance, a first angle of the current actual position of the eye of the person being measured relative to the preset actual position is obtained, and according to the first angle, the reflective element is rotated around the rotation axis from the initial state to make the formed outgoing light incident to the eye of the person being measured. Among them, the vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image; when the reflective element is in the initial state, the formed emergent light is incident on the preset actual position, and when the measured human eye is in the preset actual position, the measured human eye is in the reference vertical position in the image obtained for the measured human eye, and the first angle of the current actual position of the measured human eye relative to the preset actual position is the direction of the formed emergent light when it is incident on the current actual position, relative to the angle of the direction of the formed emergent light when it is incident on the preset actual position.

[0040] The alignment adjustment method and system of the present invention obtain an image of the human eye to be measured, rotate the reflective element according to the position of the human eye to be measured in the obtained image, so that the formed output light is aligned with the human eye to be measured and incident on the human eye to be measured, which does not require manual adjustment and is more convenient and intelligent. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A flowchart of an alignment adjustment method provided by an embodiment of the present invention;

[0043] Figure 2 A schematic diagram of a reflective element and an image acquisition component in an alignment adjustment method provided by an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the arrangement of an entrance pupil and a rotation axis of an image acquisition component in an alignment adjustment method provided by an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of obtaining a first preset relationship in an alignment adjustment method provided by an embodiment of the present invention;

[0046] Figure 5 A schematic diagram of rotating a reflective element in an alignment adjustment method provided by an embodiment of the present invention;

[0047] Figure 6 A first image obtained in an alignment adjustment method provided by an embodiment of the present invention;

[0048] Figure 7 A side view of an alignment adjustment system and a human eye under test provided by an embodiment of the present invention;

[0049] Figure 8 for Figure 7 A top view of the alignment adjustment system shown;

[0050] Fig. 9 A schematic diagram of an alignment adjustment system provided in yet another embodiment of the present invention.

[0051] The reference numerals in the drawings of the specification include:

[0052] 100 - human eye under test, 101 - reflective element, 102 - rotating shaft, 103 - image acquisition component, 104 - lens, 105 - image sensor, 106 - entrance pupil, 107 - image plane, 108 - object plane, 109 - motor, 110 - control device. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0054] This embodiment provides an alignment adjustment method, which is applied to a device including a reflective element, wherein the reflective element is used to reflect incident light incident on the reflective element so that the formed output light is incident on the eye of a person being measured, and the reflective element can rotate around a rotation axis, and the rotation axis is perpendicular to a plane where an optical axis of the incident light intersects with an optical axis of reflected light when the incident light is incident on the reflective element.

[0055] For reference Figure 1 , Figure 1 A flowchart of an alignment adjustment method provided by an embodiment is shown in the figure. The alignment adjustment method includes the following steps:

[0056] S11: When the reflective element is in an initial state, an image is acquired for the eye of the person being tested to obtain a first image, and when the image is acquired for the eye of the person being tested, the vertical direction of the image is perpendicular to the rotation axis.

[0057] The eye of the person being tested observes the reflective element, an image of the eye of the person being tested is acquired, and a first image is obtained.

[0058] S12: Obtain a vertical distance from the measured human eye to a reference vertical position in the first image, obtain a first angle of the current actual position of the measured human eye relative to a preset actual position based on the vertical distance, and rotate the reflective element from the initial state around the rotation axis based on the first angle so that the generated outgoing light is incident on the measured human eye.

[0059] The vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image.

[0060] When the reflective element is in the initial state, the outgoing light is incident on the preset actual position. When the human eye to be measured is in the preset actual position, the human eye to be measured is in the reference vertical position in the image obtained for the human eye to be measured. The first angle of the current actual position of the human eye to be measured relative to the preset actual position is the direction of the outgoing light formed when it is incident on the current actual position, relative to the angle of the direction of the outgoing light formed when it is incident on the preset actual position.

[0061] When the reflective element is in the initial state, the incident light is incident on the reflective element and is reflected, and the generated outgoing light is irradiated to the preset actual position. If the reflective element is in the initial state and the measured human eye is in the preset actual position, the generated outgoing light will irradiate the measured human eye.

[0062] The vertical position in the image refers to the position along the vertical direction of the image. The measured human eye in the image obtained for the measured human eye is at the reference vertical position means that in the image obtained for the measured human eye, the vertical position of the measured human eye is at the reference vertical position. If the measured human eye is at the preset actual position, the measured human eye is at the reference vertical position in the image obtained for the measured human eye.

[0063] The direction of the outgoing light can be changed by rotating the reflective element around the rotation axis. The rotation axis is perpendicular to the plane where the optical axis of the incident light intersects with the optical axis of the reflected light when the incident light is incident on the reflective element, and the vertical direction of the image when the image is obtained by the human eye under test is perpendicular to the rotation axis. Therefore, when the reflective element rotates around the rotation axis, the irradiation position of the outgoing light in the image obtained by the human eye under test changes along the vertical direction of the image.

[0064] Furthermore, the vertical position corresponding to the irradiation position of the outgoing light in the image obtained for the human eye under test corresponds to the direction of the outgoing light formed. Therefore, the vertical distance from the irradiation position of the outgoing light in the image obtained for the human eye under test to the reference vertical position has a corresponding relationship with the direction of the outgoing light formed, and also has a corresponding relationship with the angle of the direction of the outgoing light formed relative to the direction when the outgoing light formed is incident on the preset actual position.

[0065] Therefore, for the first image obtained, according to the vertical distance from the measured human eye to the reference vertical position in the first image, the first angle of the current actual position of the measured human eye relative to the preset actual position can be obtained. Further, according to the first angle, the reflective element is rotated around the rotation axis to adjust the direction of the generated outgoing light so that the generated outgoing light can be irradiated to the current actual position, that is, it can be incident on the measured human eye. The alignment adjustment method of this embodiment obtains an image of the measured human eye, rotates the reflective element according to the position of the measured human eye in the obtained image, so that the generated outgoing light is aligned with the measured human eye and is incident on the measured human eye. No manual adjustment is required, which is more convenient and intelligent.

[0066] For example, reference may be made to Figure 2 , Figure 2 The schematic diagram of a reflective element and an image acquisition component in an alignment adjustment method provided in an embodiment, in which the curve with an arrow indicates the direction of rotation, and the solid line with an arrow indicates the direction of light propagation. As shown in the figure, the reflective element 101 can rotate around the rotation axis 102. When the incident light is incident on the reflective element 101, it is reflected out, and the rotation axis 102 is perpendicular to the plane where the optical axis of the incident light intersects with the optical axis of the reflected light when the incident light is incident on the reflective element 101. The image is acquired through the image acquisition component 103, and the vertical direction of the image plane 107 of the image acquisition component 103 is perpendicular to the rotation axis 102, so that when the image is acquired for the human eye 100 under test, the vertical direction of the image is perpendicular to the rotation axis 102. As shown in the figure, the reflective element 101 is rotated around the rotation axis 102, and the direction of the reflected light when the incident light is incident on the reflective element 101 changes accordingly, and the irradiation position of the outgoing light in the image acquired by the image acquisition component 103 changes along the vertical direction of the image. In actual application, when a face appears in front of the device, the image acquisition component 103 collects the face image, and calculates the vertical distance between the eyes and the reference vertical position on the image through feature analysis and recognition of the face image.

[0067] In some embodiments, obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance includes: obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance and the first preset relationship, wherein the first preset relationship is obtained by pre-calibration, and the first preset relationship describes the relationship between the first angle of the actual position of the measured human eye relative to the preset actual position and the vertical distance from the measured human eye to the reference vertical position in the image obtained for the measured human eye. The first preset relationship is obtained by pre-calibration, so in actual application, after obtaining the vertical distance according to the first image obtained for the measured human eye, the first angle can be obtained according to the vertical distance and the first preset relationship, making the alignment adjustment process more convenient and intelligent.

[0068] In some embodiments, the image of the human eye under test is acquired through the image acquisition component 103, and the entrance pupil 106 of the image acquisition component 103 is located on the rotation axis 102, and the vertical direction of the image plane of the image acquisition component 103 is perpendicular to the rotation axis 102. The entrance pupil 106 of the image acquisition component 103 is the effective aperture of the incident light beam that limits the image acquisition component 103, and is the image of the aperture stop on the front optical system. The position and diameter of the entrance pupil represent the position and diameter of the incident light beam respectively. Figure 3 , Figure 3 The diagram is a schematic diagram of the arrangement of the entrance pupil and the rotation axis of the image acquisition component in an alignment adjustment method provided by an embodiment, and the field of view indicated in the figure is the field of view of the image acquisition component 103. The entrance pupil 106 of the image acquisition component 103 is located on the rotation axis 102, so that the field of view of the image acquisition component 103 on a plane perpendicular to the rotation axis 102 can correspond to the direction of the reflected light when the incident light is incident on the reflective element 101, and the light rays of each field of view angle of the image acquisition component 103 can coincide with the reflected light of the reflective element 101, so that the accuracy of the angle measurement of the current actual position of the measured human eye relative to the preset actual position can be improved. Exemplarily, the following method can be used to obtain the position of the entrance pupil 106 of the image acquisition component 103: for an actual lens, use a white board, draw straight lines from a certain point on the board in different directions, and then place the white board in front of the lens, with the board surface parallel to the optical axis of the lens and the intersection of the straight lines on the board facing the image plane; continue to push the board toward the image plane until the stripes radiating outward observed by the original lens gradually become parallel, at which point the intersection position on the white board is the position of the entrance pupil.

[0069] In this embodiment, obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance may include: obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance and the first preset relationship. The first preset relationship may be obtained by the following method, including the following steps:

[0070] S21: enabling the image acquisition component 103 to acquire an image of an object plane to obtain a second image, wherein the object plane is provided with a plurality of object points having different vertical positions, and the plurality of object points include preset object points.

[0071] The vertical position of the object point refers to the position of the object point vertically along the object plane. In the second image, the image point corresponding to the preset object point is at a reference vertical position.

[0072] S22: For any of the object points, obtain the second angle of the object point relative to the preset object point, and obtain the vertical distance from the image point corresponding to the object point to the image point corresponding to the preset object point in the second image. The image point corresponding to the preset object point in the second image is at the reference vertical position, and the second angle of the object point relative to the preset object point is the direction in which the light of the object point enters the image acquisition component 103 through the entrance pupil 106 and is incident on the image plane 107, relative to the angle in which the light of the preset object point enters the image acquisition component 103 through the entrance pupil 106 and is incident on the image plane 107.

[0073] S23: Obtaining the first preset relationship according to the second angles and vertical distances corresponding to the multiple object points.

[0074] The entrance pupil 106 of the image acquisition component 103 is located on the rotating shaft 102, so that the direction of the object point light incident on the image acquisition component 103 can correspond inversely to the direction of the reflected light when the incident light is incident on the reflective element 101. Therefore, the second angle of the object point relative to the preset object point can correspond to the first angle of the actual position of the measured human eye relative to the preset actual position, so according to the second angles and vertical distances corresponding to the multiple object points, the first preset relationship can be obtained, that is, the relationship between the first angle of the actual position of the measured human eye relative to the preset actual position and the vertical distance from the measured human eye to the reference vertical position in the image acquired from the measured human eye can be obtained.

[0075] For any object point, according to the obtained second image, the vertical distance from the image point corresponding to the object point in the second image to the image point corresponding to the preset object point can be obtained.

[0076] For any object point, the second angle corresponding to the object point can be obtained based on the geometric optical relationship followed by the image acquisition component 103 in imaging the object plane, the vertical position of the object point on the object plane, and the distance from the object plane to the entrance pupil 106 of the image acquisition component 103, or the second angle corresponding to the object point can be obtained based on the vertical position of the image point corresponding to the object point on the image plane, and the distance from the image plane to the entrance pupil 106 of the image acquisition component 103.

[0077] For example, reference may be made to Figure 4 , Figure 4 A schematic diagram of obtaining a first preset relationship in an alignment adjustment method provided by an embodiment is shown in the figure. As shown in the figure, a group of concentric circles are provided on the object plane 107, and the diameters are D1, D2, D3 and D4 from small to large, and the center is O. The center O is used as a preset object point, and multiple object points with different vertical positions are selected in sequence on the group of concentric circles, and the vertical distances from the multiple object points to the preset object point O are D1 / 2, D2 / 2, D3 / 2 and D4 / 2. The object plane 108 is imaged by the image acquisition component 103, and a group of concentric circle images are obtained on the image plane 107, and the diameters are d1, d2, d3 and d4 from small to large, and the center is O´. The center O´ is the image point corresponding to the preset object point O, and the vertical distances from the image point formed by the multiple object points selected on the object plane 108 on the image plane 107 to O´ are represented as h1, h2, h3 and h4.

[0078] exist Figure 4As shown, the optical axis of the image acquisition component 103 is aligned with the center O of the object plane 107, and the distance from the object plane 107 to the entrance pupil 106 of the image acquisition component 103 is L. For any object point, according to the vertical distance from the object point to the preset object point O and the distance L from the object plane 107 to the entrance pupil 106 of the image acquisition component 103, the direction of the light of the object point entering the image acquisition component 103 through the entrance pupil 106 and incident on the image plane 107 can be obtained, which is the angle of the direction of the light of the preset object point entering the image acquisition component 103 through the entrance pupil 106 and incident on the image plane 107, that is, the second angle α. The second angles corresponding to the multiple object points are represented as α1, α2, α3 and α4 respectively. According to the trigonometric function relationship, tan (α1) = D1 / (2L), tan (α2) = D2 / (2L), tan (α3) = D3 / (2L), tan (α4) = D4 / (2L). The vertical distances from the image points corresponding to the multiple object points to O´ are: h1=d1 / 2, h2=d2 / 2, h3=d3 / 2, h4=d4 / 2. According to the second angle α corresponding to the multiple object points and the vertical distance h of the corresponding image points, the relationship between the two can be obtained, which can be expressed as α=f(h), where h represents the vertical distance from the image point corresponding to the object point to the image point corresponding to the preset object point on the image plane. The second angle α corresponds to the first angle A, and the vertical distance h from the image point corresponding to the object point to the image point corresponding to the preset object point on the image plane 107 corresponds to the vertical distance H from the human eye under test to the reference vertical position in the image acquired by the image acquisition component 103 for the human eye under test. Therefore, obtaining α=f(h) can represent the first preset relationship, which can be obtained as A=f(H).

[0079] In some embodiments, the first preset relationship includes a first sub-preset relationship and a second sub-preset relationship;

[0080] The first sub-preset relationship describes the relationship between the first angle of the actual position of the tested human eye relative to the preset actual position and the vertical distance from the tested human eye to the reference vertical position in the image obtained for the tested human eye when the tested human eye is higher than the reference vertical position, wherein the first angle is the angle of the direction of the generated outgoing light when incident on the actual position, relative to the direction of the generated outgoing light when incident on the preset actual position, rotated clockwise / counterclockwise;

[0081] The second sub-preset relationship describes the relationship between the first angle of the actual position of the human eye under test relative to the preset actual position, and the vertical distance from the human eye under test to the reference vertical position in the image obtained for the human eye under test when the human eye under test is lower than the reference vertical position in the image obtained for the human eye under test, the first angle being the direction of the emitted light formed when it is incident on the actual position, and the angle rotated counterclockwise / clockwise relative to the direction of the emitted light formed when it is incident on the preset actual position.

[0082] Correspondingly, obtaining a first angle of the current actual position of the measured human eye relative to a preset actual position according to the vertical distance, and rotating the reflective element around the rotation axis from the initial state according to the first angle so that the formed outgoing light is incident on the measured human eye includes:

[0083] If the measured human eye is higher than the reference vertical position in the first image, obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance and the first sub-preset relationship, and rotating the reflective element clockwise / counterclockwise around the rotation axis from the initial state according to the first angle, so that the generated outgoing light is incident on the measured human eye;

[0084] If the measured human eye is lower than the reference vertical position in the first image, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained according to the vertical distance and the second sub-preset relationship, and the reflective element is rotated counterclockwise / clockwise around the rotation axis from the initial state according to the first angle so that the formed output light is incident on the measured human eye.

[0085] For example, reference may be made to Figure 5 and Figure 6 , Figure 5 A schematic diagram of rotating a reflective element in an alignment adjustment method provided by an embodiment, Figure 6 A first image obtained in an alignment adjustment method provided by an embodiment. The vertical position of the center of the first image is taken as the reference vertical position. In the first image, the human eye 100 under test is higher than the reference vertical position, and the vertical distance from the human eye 100 under test to the reference vertical position in the first image is H. The first angle A is the direction of the generated outgoing light when it is incident on the actual position, which is the angle of the generated outgoing light when it is incident on the preset actual position in a clockwise direction. Figure 5As shown, when the reflective element 101 is in an initial state, the outgoing light formed is incident on a preset actual position, and according to the vertical distance H and the first sub-preset relationship A=f(H), a first angle A is obtained. According to the first angle A, the reflective element 101 is rotated clockwise around the rotation axis 102 from the initial state, so that the formed outgoing light is incident on the human eye 100 to be measured.

[0086] In some embodiments, when the human eye 100 under test is in the preset actual position, the human eye 100 under test is in the vertical position corresponding to the center of the image in the image obtained for the human eye 100 under test. That is, the reference vertical position in the image obtained for the human eye 100 under test is the vertical position of the center of the image. In this embodiment, when the reflective element 101 is in the initial state, the optical axis of the emitted light formed is parallel to the optical axis of the image acquisition component 103. If the optical axis of the emitted light formed when the reflective element 101 is in the initial state is not parallel to the optical axis of the image acquisition component 103, and there is a deviation angle between the direction of the emitted light and the direction of the optical axis of the image acquisition component 103, then this angle needs to be subtracted during calculation, which makes the calculation more complicated. In addition, the direction of the emitted light when the reflective element 101 is in the initial state is preferably set to the middle position of the entire adjustment range. If the optical axis of the emitted light formed when the reflective element 101 is in the initial state is not parallel to the optical axis of the image acquisition component 103, it will cause inconsistency between the upper and lower ranges, and the field of view of the lens cannot be fully utilized.

[0087] In some embodiments, when the reflective element 101 is in the initial state, the incident light is incident on the reflective element 101 and is reflected, and the direction of the generated outgoing light may be horizontal. Figure 5 As shown, when the reflective element 101 is in an initial state, the incident light is incident on the reflective element 101 and is reflected, and the generated outgoing light is emitted in a horizontal direction.

[0088] In some embodiments, rotating the reflective element 101 from the initial state around the rotation axis 102 according to the first angle includes: driving the reflective element to rotate around the rotation axis 102 by a motor, obtaining the number of rotation steps of the motor according to the first angle and the second preset relationship, and causing the motor to drive the reflective element 101 to rotate around the rotation axis 102 according to the number of rotation steps. The second preset relationship describes the relationship between the angle of rotation of the reflective element 101 around the rotation axis 102 and the number of rotation steps of the motor. In practical applications, the second preset relationship is obtained in advance, the number of rotation steps of the motor is obtained according to the first angle and the second preset relationship, and the motor drives the reflective element 101 to rotate around the rotation axis 102 according to the number of rotation steps, which is more convenient and intelligent.

[0089] In some embodiments, rotating the reflective element 101 from the initial state around the rotation axis 102 according to the first angle so that the generated outgoing light is incident on the measured human eye 100 includes: obtaining a third angle according to the first angle, rotating the reflective element 101 from the initial state around the rotation axis 102 by the third angle so that the generated outgoing light is incident on the measured human eye 100. According to the law of reflection, when the incident light keeps the incident direction unchanged, the angle of change of the outgoing light direction is twice the rotation angle of the reflective element 101. Figure 5 As shown, according to the law of reflection, the rotation angle of the reflective element is A / 2.

[0090] The relationship between the rotation angle β of the reflective element 101 and the number of rotation steps s of the motor can be expressed as β=g(s). According to β=A / 2 and β=g(s), the number of rotation steps S of the motor can be obtained when the rotation angle of the reflective element 101 is A / 2. Further, the motor can be controlled to rotate S steps to align the emitted light with the measured human eye 100. The reflective element 101 can be a reflector.

[0091] This embodiment also provides an alignment adjustment system, comprising:

[0092] The reflective element 101 is used to reflect the incident light incident to the reflective element 101 so that the formed outgoing light is incident to the human eye 100 to be measured. The reflective element 101 can rotate around the rotation axis 102, and the rotation axis 102 is perpendicular to the plane where the optical axis of the incident light and the optical axis of the reflected light when the incident light is incident on the reflective element intersect;

[0093] An image acquisition component 103, used for acquiring an image of the human eye 100 under test, wherein the image plane of the image acquisition component 103 is vertically perpendicular to the rotation axis 102;

[0094] A control device 110 is connected to the reflective element 101 and the image acquisition component 103 for communication, and is used to control the image acquisition component 103 to acquire an image of the human eye 100 to be measured when the reflective element 101 is in an initial state, to obtain a first image, and further obtain a vertical distance from the human eye to be measured to a reference vertical position in the first image, and obtain a first angle of the current actual position of the human eye to be measured relative to a preset actual position according to the vertical distance, and rotate the reflective element 101 from the initial state around the rotation axis 102 according to the first angle, so that the generated outgoing light is incident on the human eye 100 to be measured;

[0095] Among them, the vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image; when the reflective element 101 is in the initial state, the formed outgoing light is incident on the preset actual position, and when the measured human eye 100 is in the preset actual position, the measured human eye in the image obtained for the measured human eye 100 is in the reference vertical position, and the first angle of the current actual position of the measured human eye 100 relative to the preset actual position is the direction of the formed outgoing light when it is incident on the current actual position, relative to the angle of the direction of the formed outgoing light when it is incident on the preset actual position.

[0096] The alignment and adjustment system of this embodiment obtains an image of the human eye to be measured, rotates the reflective element according to the position of the human eye to be measured in the obtained image, so that the formed outgoing light is aligned with the human eye to be measured and incident on the human eye to be measured. It does not require manual adjustment and is more convenient and intelligent.

[0097] In some embodiments, the entrance pupil 106 of the image acquisition component 103 is located on the rotation axis 102, so that the field of view of the image acquisition component 103 on the plane perpendicular to the rotation axis 102 can correspond to the direction of the reflected light when the incident light is incident on the reflective element 101, and the light rays at various field of view angles of the image acquisition component 103 can coincide with the reflected light of the reflective element 101, thereby improving the accuracy of the angle measurement of the current actual position of the measured human eye 100 relative to the preset actual position.

[0098] In some embodiments, when the reflective element 101 is in the initial state, the optical axis of the emitted light is parallel to the optical axis of the image acquisition component 103. If the optical axis of the emitted light formed when the reflective element 101 is in the initial state is not parallel to the optical axis of the image acquisition component 103, and there is a deviation angle between the direction of the emitted light and the direction of the optical axis of the image acquisition component 103, then this angle needs to be subtracted when calculating the angle, which makes the calculation more complicated. In addition, the direction of the emitted light when the reflective element 101 is in the initial state is preferably set to the middle position of the entire adjustment range. If the optical axis of the emitted light formed when the reflective element 101 is in the initial state is not parallel to the optical axis of the image acquisition component 103, the upper and lower ranges will be inconsistent, and the field of view of the lens cannot be fully utilized.

[0099] For example, reference may be made to Figure 7 and Figure 8 , Figure 7 A side view of an alignment adjustment system and a human eye under test provided by an embodiment, Figure 8 for Figure 7The top view of the alignment adjustment system is shown in the figure, as shown in the figure, the reflective element 101 can rotate around the rotation axis 102. When the incident light is incident on the reflective element 101, it is reflected, and the rotation axis 102 is perpendicular to the plane where the optical axis of the incident light intersects with the optical axis of the reflected light when the incident light is incident on the reflective element 101. The image is acquired by the image acquisition component 103, and the vertical direction of the image plane 107 of the image acquisition component 103 is perpendicular to the rotation axis 102, so that when the image is acquired for the human eye 100 under test, the image is vertically perpendicular to the rotation axis 102.

[0100] In some implementations, the image acquisition component 103 includes a lens 104 and an image sensor 105 , and the image sensor 105 is located at the image plane 107 .

[0101] In some embodiments, the field of view of the image acquisition component 103 is not less than 30°, and the depth of field is at least 0.4m to 1.6m. The image acquisition component 103 can recognize facial features within the depth of field.

[0102] In some embodiments, the image acquisition component 103 is disposed on one side of the reflective element 101 ; the image acquisition component 103 is fixed, or the image acquisition component 103 rotates synchronously with the reflective element 101 .

[0103] In some embodiments, the alignment adjustment system further includes: a motor 109 connected to the rotation axis 102 of the reflective element 101, and configured to drive the reflective element 101 to rotate around the rotation axis 102. Fig. 9 , Fig. 9 A schematic diagram of an alignment adjustment system is provided for another embodiment, as shown in the figure, the motor 109 is connected to the rotating shaft 102 of the reflective element 101, and the control device 110 is connected to the motor 109. In some embodiments, the motor 109 can be a stepper motor, and the control device 110 can be a control circuit board.

[0104] The above is a detailed introduction to an alignment adjustment method and system provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An alignment adjustment method, characterized in that: The device applied to comprises a reflective element, the reflective element is used to reflect the incident light incident to the reflective element so that the formed outgoing light is incident to the eye of the person being measured, the reflective element can rotate around a rotation axis, and the rotation axis is perpendicular to the plane where the optical axis of the incident light intersects with the optical axis of the reflected light when the incident light is incident on the reflective element; The alignment adjustment method comprises: When the reflective element is in an initial state, an image is acquired for the human eye to obtain a first image, and when the image is acquired for the human eye to obtain, the vertical direction of the image is perpendicular to the rotation axis; Obtaining a vertical distance from the measured human eye to a reference vertical position in the first image, obtaining a first angle of a current actual position of the measured human eye relative to a preset actual position according to the vertical distance, and rotating the reflective element from the initial state around the rotation axis according to the first angle so that the generated outgoing light is incident on the measured human eye; The vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image; When the reflective element is in the initial state, the outgoing light is incident on the preset actual position. When the human eye to be measured is in the preset actual position, the human eye to be measured is in the reference vertical position in the image obtained for the human eye to be measured. The first angle of the current actual position of the human eye to be measured relative to the preset actual position is the direction of the outgoing light formed when it is incident on the current actual position, relative to the angle of the direction of the outgoing light formed when it is incident on the preset actual position.

2. The alignment adjustment method according to claim 1, characterized in that: Obtaining, according to the vertical distance, a first angle of the current actual position of the measured human eye relative to a preset actual position includes: According to the vertical distance and the first preset relationship, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained, wherein the first preset relationship is obtained by pre-calibration, and the first preset relationship describes the relationship between the actual position of the measured human eye relative to the preset actual position, the first angle, and the vertical distance from the measured human eye to the reference vertical position in the image obtained for the measured human eye.

3. The alignment adjustment method according to claim 1, characterized in that: Obtaining a first angle of the current actual position of the measured human eye relative to a preset actual position according to the vertical distance includes: obtaining the first angle of the current actual position of the measured human eye relative to a preset actual position according to the vertical distance and a first preset relationship; Acquire an image of the human eye under test through an image acquisition component, wherein an entrance pupil of the image acquisition component is located on the rotation axis, and a vertical direction of an image plane of the image acquisition component is perpendicular to the rotation axis; Obtaining the first preset relationship includes: The image acquisition component is enabled to acquire an image of an object plane to obtain a second image, wherein the object plane is provided with a plurality of object points having different vertical positions, and the plurality of object points include preset object points; For any of the object points, a second angle of the object point relative to the preset object point is obtained, and a vertical distance from an image point corresponding to the object point to an image point corresponding to the preset object point in the second image is obtained, wherein the image point corresponding to the preset object point in the second image is at the reference vertical position, and the second angle of the object point relative to the preset object point is an angle of a direction in which a light ray of the object point enters the image acquisition component through the entrance pupil and is incident on the image plane relative to a direction in which a light ray of the preset object point enters the image acquisition component through the entrance pupil and is incident on the image plane; The first preset relationship is obtained according to the second angles and vertical distances corresponding to the multiple object points.

4. The alignment adjustment method according to claim 3, characterized in that: The first preset relationship includes a first sub-preset relationship and a second sub-preset relationship; The first sub-preset relationship describes the relationship between the first angle of the actual position of the tested human eye relative to the preset actual position and the vertical distance from the tested human eye to the reference vertical position in the image obtained for the tested human eye when the tested human eye is higher than the reference vertical position, wherein the first angle is the angle of the direction of the generated outgoing light when incident on the actual position, relative to the direction of the generated outgoing light when incident on the preset actual position, rotated clockwise / counterclockwise; The second sub-preset relationship describes the relationship between the first angle of the actual position of the tested human eye relative to the preset actual position and the vertical distance from the tested human eye to the reference vertical position in the image obtained for the tested human eye when the tested human eye is lower than the reference vertical position, wherein the first angle is the angle of the direction of the generated outgoing light when incident on the actual position, rotated counterclockwise / clockwise relative to the direction of the generated outgoing light when incident on the preset actual position; Correspondingly, obtaining a first angle of the current actual position of the measured human eye relative to a preset actual position according to the vertical distance, and rotating the reflective element around the rotation axis from the initial state according to the first angle so that the formed outgoing light is incident on the measured human eye includes: If the measured human eye is higher than the reference vertical position in the first image, obtaining the first angle of the current actual position of the measured human eye relative to the preset actual position according to the vertical distance and the first sub-preset relationship, and rotating the reflective element clockwise / counterclockwise around the rotation axis from the initial state according to the first angle, so that the generated outgoing light is incident on the measured human eye; If the measured human eye is lower than the reference vertical position in the first image, the first angle of the current actual position of the measured human eye relative to the preset actual position is obtained according to the vertical distance and the second sub-preset relationship, and the reflective element is rotated counterclockwise / clockwise around the rotation axis from the initial state according to the first angle so that the formed output light is incident on the measured human eye.

5. The alignment adjustment method according to claim 1, characterized in that: When the human eye under test is at the preset actual position, the human eye under test is at a vertical position corresponding to the center of the image acquired for the human eye under test.

6. The alignment adjustment method according to claim 1, characterized in that: Rotating the reflective element from the initial state around the rotation axis according to the first angle includes: The reflective element is driven to rotate around the rotation axis by a motor, and the number of rotation steps of the motor is obtained according to the first angle and the second preset relationship, so that the motor drives the reflective element to rotate around the rotation axis according to the number of rotation steps.

7. An alignment adjustment system, characterized in that: include: A reflective element, used for reflecting the incident light incident on the reflective element so that the formed outgoing light is incident on the eye of the person being measured, wherein the reflective element can rotate around a rotation axis, and the rotation axis is perpendicular to a plane where an optical axis of the incident light intersects with an optical axis of the reflected light when the incident light is incident on the reflective element; An image acquisition component, used for acquiring an image of the human eye under test, wherein the image plane of the image acquisition component is vertically perpendicular to the rotation axis; a control device, which is in communication with the reflective element and the image acquisition component, and is used to control the image acquisition component to acquire an image of the human eye to be measured when the reflective element is in an initial state, to obtain a first image, and further obtain a vertical distance from the human eye to be measured to a reference vertical position in the first image, and obtain a first angle of a current actual position of the human eye to be measured relative to a preset actual position according to the vertical distance, and rotate the reflective element around the rotation axis from the initial state according to the first angle, so that the formed outgoing light is incident on the human eye to be measured; The vertical distance from the measured human eye to the reference vertical position in the first image is the distance from the measured human eye to the reference vertical position along the vertical direction of the first image in the first image; When the reflective element is in the initial state, the outgoing light is incident on the preset actual position. When the human eye to be measured is in the preset actual position, the human eye to be measured is in the reference vertical position in the image obtained for the human eye to be measured. The first angle of the current actual position of the human eye to be measured relative to the preset actual position is the direction of the outgoing light formed when it is incident on the current actual position, relative to the angle of the direction of the outgoing light formed when it is incident on the preset actual position.

8. The alignment adjustment system according to claim 7, characterized in that: The entrance pupil of the image acquisition component is located on the rotation axis.

9. The alignment adjustment system according to claim 7, characterized in that: When the reflective element is in the initial state, the optical axis of the emitted light is parallel to the optical axis of the image acquisition component.

10. The alignment adjustment system according to claim 7, characterized in that: The image acquisition component is arranged on one side of the reflective element; The image acquisition component is fixed, or the image acquisition component rotates synchronously with the reflective element.

Images