CN115137289A

CN115137289A - Intelligent self-service diopter measuring system

Info

Publication number: CN115137289A
Application number: CN202210904974.7A
Authority: CN
Inventors: 段兵
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-10-04

Abstract

The invention provides an intelligent self-service diopter measuring system, which comprises: the visual target display device is used for displaying the visual target to the testee; the camera is used for shooting the front image of the tested person; the offset glasses provide offset diopter for the testee, and the offset diopter is determined according to the historical diopter of the testee; a feedback device through which the subject feeds back the visual target recognition result to the central controller; and the central controller is used for acquiring the distance between the testee and the visual target according to the front image of the testee output by the camera and acquiring a diopter test result by combining the distance, the visual target identification result and the offset diopter. Carry out the diopter of testee through biasing glasses and owe the correction of certain degree for the diopter measuring range of going on afterwards is less, can reach higher measurement accuracy, and accelerate test speed, can also shorten the moving distance scope that needs when the testee diopter is measured simultaneously, has realized self-service diopter test.

Description

Intelligent self-service diopter measuring system

Technical Field

The invention relates to the technical field of diopter measurement, in particular to an intelligent self-service diopter measurement system.

Background

The effect of the eye in refracting light is called refraction. The eye is a visual organ which takes light as adaptive stimulation, the eyeball can be regarded as an optical system from an optical angle, and light rays emitted or reflected by an external object are refracted by the eyeball to form a clear and reduced reverse image on the retina. But accommodating a relaxed eye, causes the parallel light incident on the eyeball to converge in front of or behind the retina, thereby causing ametropia. Refractive errors include three conditions of myopia, hyperopia and astigmatism.

At present, most of vision tests adopt a standard logarithmic visual chart meeting the requirements of the national standard GB11533-2011, and the field test needs to be carried out in a fixed position or a fixed space under the guidance of medical staff, so that the convenience is poor. In the existing diopter measurement, a shack Hartmann wavefront sensor is generally used for acquiring a light spot array image of an eye, diopter information is acquired based on the light spot array image, and for example, in the technical scheme disclosed in the existing patent CN109645956B, staff is required to guide participation, and convenient self-service diopter measurement cannot be realized.

Although chinese patent publication No. CN113197542A discloses an online self-help vision inspection system, which is provided with a distance calculation module, a size calculation module, a display adjustment module, a vision determination module, and the like, and can perform online self-help vision inspection, and can achieve accurate self-help vision inspection without time, place limitation, and assistance personnel assistance, the system is used for measuring vision, and when measuring vision (Visual acuity), firstly, a Visual distance is determined, and the distances commonly used in medicine are 5 meters, 6 meters, 20 feet, and the like, and then, the sizes of various levels of E-shaped optotypes (such as 1.0,0.8, 0.5) on a display screen are determined, and the measurement process is to find how large an optotype can be seen by a subject at a given distance. When Visual acuity (Visual acuity) results are given, the complete result will generally describe the apparent distance at which the measurement is taken, e.g., the denominator 6 in the UK Visual acuity representation X/6 will indicate a measured apparent distance of 6 meters, and the denominator 20 in the U.S. Visual acuity representation X/20 will indicate a measured apparent distance of 20 feet. It can be seen that the distance calculation module of the patent obtains the distance in order to convert the distance to the standard visual distance so as to obtain the vision detection result by querying in the national standard GB11533-2011, and the distance calculation module needs fixed distance measurement and cannot be used for diopter measurement.

Disclosure of Invention

The invention aims to at least solve the technical problems in the prior art and provides an intelligent self-service diopter measuring system.

In order to achieve the above object of the present invention, the present invention provides an intelligent self-help diopter measurement system, comprising: the visual target display device is used for displaying the visual target to the testee; the camera is used for shooting the front image of the tested person; the offset glasses provide offset diopter for the testee, and the offset diopter is determined according to the historical diopter of the testee; a feedback device through which a subject feeds back a target recognition result to the central controller; and the central controller is used for acquiring the distance between the testee and the visual target according to the front image of the testee output by the camera and acquiring a diopter test result by combining the distance, the visual target identification result and the offset diopter.

The technical scheme is as follows: the utility model discloses a self-service diopter measurement system of novel intelligence, it is unset with the distance of sighting mark by survey personnel during the measurement, survey personnel can be followed far away to near ground and be close to the sighting mark, constantly feed back sighting mark identification result to central controller through feedback device at the removal in-process, after the surveyed person moves the position point that can see the sighting mark clearly, central controller obtains the diopter test result according to the distance of tester and sighting mark, sighting mark identification result and bias diopter, convenient self-service diopter measurement has been realized. The system enables a tested person to wear the offset glasses in advance, and corrects the diopter of the tested person to a certain degree (incomplete correction), so that the subsequent diopter measurement range is smaller, higher measurement accuracy can be achieved, the test speed is accelerated, the moving distance range of the tested person during diopter measurement can be shortened, and the requirements on a camera, a display and other equipment are reduced; the testee can feed back the visual target identification result in a self-service manner through the feedback device, so that the self-service diopter test is realized, and the manpower input is reduced; the tested person front image shot based on the camera can not only obtain the distance between the tested person and the visual target display device in real time, but also obtain the information such as the expression, the action and the offset diopter of the offset glasses of the tested person based on the tested person front image, and the system function can be greatly expanded.

Drawings

FIG. 1 is a system block diagram of an intelligent self-help diopter measurement system in a preferred embodiment of the present invention;

FIG. 2 is a schematic view of an E-shaped optotype in a preferred embodiment of the present invention;

FIG. 3 is a schematic view of an astigmatic optotype according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating the size adjustment of an E-shaped optotype in accordance with a preferred embodiment of the present invention;

FIG. 5 is a schematic view of the size adjustment of an astigmatic optotype according to a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of obtaining the distance between the subject and the visual target according to a preferred embodiment of the present invention;

fig. 7 is a schematic diagram of a real-time position display area in a preferred embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

The invention discloses an intelligent self-service diopter measuring system, as shown in figure 1, comprising: the visual target display device is used for displaying the visual target to the testee; the camera is used for shooting the front image of the tested person; the offset glasses provide offset diopter for the testee, and the offset diopter is determined according to the historical diopter of the testee; a feedback device through which a subject feeds back a target recognition result to the central controller; and the central controller is used for acquiring the distance between the testee and the visual target according to the front image of the testee output by the camera and acquiring a diopter test result by combining the distance, the visual target identification result and the offset diopter.

In this embodiment, the system can be used to measure multiple diopters, such as myopia, hyperopia, astigmatism, myopia + astigmatism, and the like. When measuring the equivalent spherical refractive error (i.e. diopter) of myopia or hyperopia, a Tumbling E visual target (as shown in FIG. 2) or a C visual target on an international visual acuity chart can be used, and as shown in FIG. 2, the directions of the letter visual target can be four directions, namely, up, down, left and right, or can be oblique directions.

In this embodiment, when the system is testing refractive error for astigmatism, an astigmatic optotype consisting of a series of fringes in different directions, as shown in figure 3, can be used. There may be one line in each set of stripes as a dashed line (which root is randomly generated by the system). The subject needs to report which is the dashed line, or no dashed line, by the feedback device when measuring astigmatism.

In the embodiment, the visual target display device is positioned in front of the tested person, and preferably, the visual target display device is a display which is connected with the central controller; the display is used for displaying the sighting target, or the display is used for displaying the sighting target and the operation indication, and the operation indication is preferably but not limited to forward one step or backward one step or standing still or giving feedback and the like. The display is preferably but not limited to a computer display screen or a television screen or an LED display screen or a liquid crystal display screen with a communication interface, the display is in communication connection with the central controller through the communication interface, and the central controller is preferably but not limited to a multi-interface computer host or a notebook computer or an embedded system.

In the present embodiment, the camera is located in front of the subject, and in order to simplify the calculation result, it is further preferable that the distance between the camera and the display and the subject is the same, and specifically, the camera may be fixed to the upper end of the display by a mounting clip or a mount.

In this embodiment, the lenses on the offset glasses may be single near-sighted or far-sighted or astigmatic offset lenses, or a combination of near-sighted and astigmatic lenses, or the like. Preferably, to facilitate lens mounting, a lens mounting slot is provided on the offset eyeglasses. In the myopic bias lens group, a plurality of myopic lenses with spherical diameter degrees, such as-100, -200, -250, -300, -400, -500 and the like are provided, if the tested person is myopic + astigmatic, horizontal column diameter degrees, such as-75, -150 and the like, are respectively added on the basis of the above spherical diameter degrees; or adding vertical column diameter degrees of-75 to-150 on the basis of the sphere diameter degrees. +100, +200, +300, +400, etc. degrees are included in the presbyopic set of offset lenses. The offset diopter of the offset glasses is the sphere diameter degree or the horizontal column diameter degree or the sum of the horizontal column diameter degree and the sphere diameter degree of the lenses. Preferably, if the historical diopters of the left and right eyes of the subject are different, the offset diopters of the left and right lenses are set to be different accordingly.

In this embodiment, a chinese patent with publication No. CN113197542A is used for measuring vision, and in this patent test, under-corrected offset glasses cannot be used, otherwise the vision measurement result is incorrect. However, in the present invention, when measuring diopter, the distance is uncertain, and there is no fixed standard, the measuring process is to give only one visual target size, and to find out at what distance, the subject can see the visual target, and it can be seen that patent CN113197542A is different from the measuring object, measuring index, measuring method and process, and calculating result of the present invention.

In the present embodiment, it is preferable that the history diopter of the subject is known in advance, and the offset diopter of the offset eyeglasses after the lens is attached is made to approach the history diopter. Specifically, according to the diopter history of a myopic patient, a closer under-correction diopter is selected, the testee carries out diopter measurement after wearing, and the under-correction diopter can be as small as about-100 diopters and can also be as large as-200 diopters, -250 diopters, -300 diopters and the like. The greater the amount of under-correction, the fewer number of offset eyeglasses that need to be provided. Such as: patients who register near vision around-400 degrees may be given under-corrected glasses of-200 degrees or-250 degrees. For the testee with serious astigmatism, the astigmatism biased lens may be used in the same method as the sphere under-correction principle of myopia bias. Such as: a test subject with 150 degrees astigmatism was assigned a-75 degree offset. For hyperopic subjects, the offset lenses used should be overcorrected to hyperopic power. Such as: for patients with +200 degrees of hyperopia, plus 300 degrees or plus 400 degrees of offset spectacles were dispensed. The coarse offset may reduce the number of offset glasses. For patients who combine hyperopia and astigmatism, the spherical power needs to be over-corrected, while the cylindrical power does not need to be over-corrected.

In the present embodiment, in order to measure a wide diopter range without using offset glasses, the distance between the measured person and the display is generally as far as 2 meters or more and as close as 10 centimeters, which requires both the camera and the display to have high resolution, the former requirement being determined by the distance and the latter requirement being determined by the near distance. The offset glasses enable the moving distance of a tested person during testing to be in a moderate small range, so that equipment with ordinary resolution (such as a camera and a display) can meet the requirements.

In this embodiment, the offset glasses also have a fog effect, and children with myopia usually have a strong accommodation ability, and without mydriasis, ciliary muscles are not easy to relax or even spasm, which will result in a higher measurement result. Because the offset glasses provide under-correction, relative to full correction, it is equivalent to superimposing a small amount of a negative offset positive lens over the negative myopic lens. The use of a positive lens to cause fogging to induce ciliary muscle relaxation is one approach commonly used in the clinic. In the present system, this is achieved with an under-corrected negative lens.

In this embodiment, the offset diopter information of the offset eyeglasses is preferably, but not limited to, input to the central controller via an input device for subsequent processing by the central controller. The feedback device is preferably but not limited to an operating handle, the operating handle comprises a tested person input module and a handle communication module, the tested person input module is preferably but not limited to an existing key group key, a touch screen or a voice recognition module, the tested person adopts a key, touch, voice conversation and the like to feed back a visual target recognition result, and the visual target recognition result is preferably but not limited to 'cannot see clearly', 'can see clearly', 'the letter faces left' and 'the letter faces right'. The handle communication module is connected with the central processing unit in a wired or wireless mode, and the handle communication module is preferably but not limited to an existing RS232 serial port communication module, an RS485 serial port communication module, a WIFI communication module, a Bluetooth module or a radio frequency communication module for remote control.

In the present embodiment, if the historical diopter of the test subject is small or normal, the lenses of the offset eyeglasses may be set as plano lenses or no lenses.

In this embodiment, the central controller is in communication connection with the camera to obtain an image captured by the camera, and the central controller is configured to obtain a distance between the test subject and the visual target according to the front image of the test subject output by the camera, where the distance between the test subject and the visual target is a distance between the test subject and the display. For a specific process of acquiring the distance, reference may be made to a technical scheme disclosed in chinese patent No. CN113197542A in the prior art, and details are not described herein again. The central controller can obtain the real-time distance between the visual target and the tested person according to the front image of the tested person shot by the camera in real time, and can also obtain the distance between the tested person and the visual target when the tested person feeds back the visual target recognition result, so that the waste of calculation resources can be avoided.

In this embodiment, the process of the central controller combining the distance, the target recognition result and the offset diopter to obtain the diopter test result is as follows: when the visual target identification result fed back by the testee is 'clear to see' or the error rate is smaller than the error rate threshold value, the central controller acquires the distance between the testee and the visual target at the moment; and selecting the maximum distance between the testee and the visual target when the testee feeds back that the vision is clear or the error rate is smaller than the error rate threshold value, obtaining the corrected diopter value of the testee through the maximum distance, and adding the corrected diopter value to the offset diopter of the offset glasses to obtain the final diopter value of the testee.

In this embodiment, whenWhen the testee measures the myopia diopter or the hyperopia diopter, the alphabetical sighting mark is adopted, the diopter value of the testee after correction is the reciprocal of the maximum distance, and the equivalent spherical diameter R after correction is as follows:

dis represents the maximum distance between the test subject and the optotype when the test subject feeds back "can see clearly". When the testee performs the astigmatic diopter measurement, the astigmatic optotype shown in fig. 3 is used to obtain the maximum distance (distance between the testee and the optotype) distar when the testee feeds back that only one fringe can be seen clearly, and the maximum distance (distance between the testee and the optotype) distear when the testee feeds back that all the fringes can be seen clearly, so as to obtain the corrected sphere power of the testee

The corrected cylinder power of the tested person is

In a preferred embodiment, in order to improve the test accuracy, the central controller comprises a sighting target display adjusting module, the sighting target display adjusting module adjusts the linear size of the sighting target in the display according to the distance between the testee and the sighting target, and the field angle of the sighting target to human eyes is kept unchanged, and the specific process is as follows:

the central controller acquires a front image of the testee from the camera in real time, and acquires the real-time distance between the testee and the sighting target based on the front image of the testee;

the size of the optotype displayed in the display is scaled up in the same scale as the real-time distance increases, and the size of the optotype displayed in the display is scaled down in the same scale as the real-time distance decreases.

In the present embodiment, as shown in fig. 4, the field angle θ of the alphabetical sighting mark to the spectacles remains constant regardless of the distance of the testee, and θ is preferably but not limited to 5 minutes, which corresponds to 1.0 vision; similar to the alphabetical visual target, the size of the astigmatic visual target varies as shown in fig. 5, and the field angle of each group of fringes is kept constant at different distances. Therefore, the visual target displayed on the screen is gradually reduced in the process that the tested person approaches to the display screen, and the visual target is gradually increased in the process that the tested person moves backwards.

In this embodiment, it is further preferable that, in order to further improve the accuracy of the diopter test, the sighting target display adjusting module controls the display to display the white background sighting target first, and after the testee feeds back the sighting target capable of seeing the white background, the display is further controlled to display the red and green background sighting target, where the red and green background sighting target is a sighting target with a red background and a green background on the display interface simultaneously, so as to determine the diopter more finely, and when the red and green background sighting target of the testee can both see clearly or the error rate is smaller than the error rate threshold value, and the sighting target identification accuracy is the same, it is determined that the fine diopter test can be performed.

In a preferred embodiment, in order to increase the data processing speed, reduce the computational complexity and improve the distance acquisition accuracy, the offset glasses are provided with two spaced marks, that is, a certain distance is provided between the two marks, and the distance is defined as a geospatial distance, and the central controller further comprises a distance acquisition module; the distance acquisition module is used for acquiring the distance between the testee and the sighting target according to the pixel distance of the two marks in the front image of the testee, the geographic space distance of the two marks and the camera parameter. The camera parameters preferably include, but are not limited to, the field angle and the number of resolution pixels of the camera.

In the present embodiment, the mark is preferably, but not limited to, a paper label or a color mark. Preferably, the two marks are respectively positioned on the left lens and the right lens of the offset glasses, so that the two marks can be quickly positioned and identified in the front image of the tested person. As shown in fig. 6, the geospatial distance between the two markers is W, the field angle of the camera is V, the distance d between the subject and the optotype can be obtained according to the following formula,

wherein Z represents the pixel distance of the two marks, namely the number of pixel points representing the distance between the center points of the two marks in the front image of the tested person,f denotes the number of resolution pixels of the camera.

In this embodiment, it is further preferable that, in order to enable the central controller to automatically obtain the offset diopter of the offset glasses and improve the efficiency, as shown in fig. 6, the offset glasses are provided with identification marks, the identification marks are in one-to-one correspondence with the offset diopter of the offset glasses, the identification marks are preferably, but not limited to, one-dimensional code tags or two-dimensional code tags, and the identification marks are associated with the offset diopter of two lenses of the offset glasses; the central controller comprises an offset diopter recognition module, and the offset diopter recognition module recognizes the recognition marks in the front image of the testee to obtain the offset diopter of the offset glasses.

In this embodiment, in order to facilitate asynchronous replacement of the left and right lenses and to obtain the offset diopter of each lens quickly, and simplify the system, it is further preferable that, as shown in fig. 6, two marks are respectively disposed on two lenses of the offset glasses, the left mark is a left identification mark corresponding to the offset diopter of the left lens one to one, and the right mark is a right identification mark corresponding to the offset diopter of the right lens one to one; the offset diopter identification module identifies two identification marks in the front image of the tested person to obtain the offset diopters of the two lenses.

In a preferred embodiment, in order to improve user experience and accelerate testing speed, the central controller includes a distance adjustment module, and when the visual target recognition result of the tested person is that the visual target is not clearly seen or the error rate reaches the error rate threshold, the distance adjustment module is configured to obtain distance adjustment information of the tested person according to the visual target display state and the distance between the tested person and the visual target, where the distance adjustment information includes the moving direction of the tested person and/or the moving distance of the tested person. The direction of movement includes forward or backward.

In this embodiment, the distance adjustment information acquisition process includes: when the current sighting mark is the red-green background sighting mark, if the testee can only see the green background sighting mark clearly or the error rate of the green background sighting mark is smaller than the error rate threshold value, the distance adjusting information is as follows: back by one step with a step pitch of

dis represents the current distance between the testee and the sighting target obtained by the central controller; if the testee can only see the red background optotype clearly or the error rate of the red background optotype is smaller than the error rate threshold, the distance adjustment information is as follows: one step ahead with a step pitch of

If the tested person can see the red and green background visual targets or the error rates of the two background visual targets are smaller than the error rate threshold value at the same time, the distance does not need to be adjusted; when the current sighting mark is not red, green and when the sighting mark is not seen, if the sighting mark is not seen clearly or the sighting mark identification error rate is less than the error rate threshold value, the distance adjustment information is as follows: one step is carried out.

In the present embodiment, it is preferable to notify the distance adjustment information to the test subject by means of voice prompt, display on a display, or the like, in order to improve the user experience.

In a preferred embodiment, in order to enable the testee to move within a suitable distance range, increase the testing speed and improve the measurement accuracy, the central controller further includes an initial distance obtaining module, and the initial distance obtaining module is configured to set an initial distance from the testee to the visual target according to the historical diopter of the testee, and specifically includes:

when the tested person has no offset measurement, for example, the tested person cannot know the historical diopter or does not have the historical diopter, the initial distance is set to be L meters, the value range of L is 1.8-2.1, and preferably, L is 2;

when the historical diopter of the tested person is known and the worn offset eyeglasses have offset diopters, the initial distance is set as:

wherein R is ₀ Representing the historical diopter value, floor (·) represents a rounded down function.

In a preferred embodiment, in order to improve user experience and accelerate testing speed, the central controller further comprises a position indication module, the position indication module is used for displaying a real-time position display area on the controller display, the real-time position display area displays a virtual image and a target position of a tested person, and the distance between the tested person and the target position is dynamically updated. The destination location is preferably, but not limited to, an initial distance location or a location corresponding to the distance adjustment information during the test. Specifically, as shown in fig. 7, whether the difference from the current position of the subject to the target position exists or not is represented by different patterns or different colors. Based on the real-time feedback of the graph, the testee can clearly know how much to advance or retreat. In fig. 7, a region a represents a target position, a point B represents a current position of the subject, a region C represents a region beyond the target position, and a point D represents a movement start point.

In this embodiment, preferably, in an application scenario, the position indicating device includes a row of indicator lights installed on the ground, and the specific installation manner may be to provide a mounting hole on the ground, the indicator lights are installed in the mounting hole and have a height lower than the ground, the row of indicator lights extend forward from the display, the central controller includes a lighting control module, and the lighting control module operates as follows: after the initial distance is obtained, the lighting control module controls the indicator lights which are at the initial distance or close to the initial distance from the display to be turned on, and the rest indicator lights are turned off; after the distance adjustment information is obtained, the previous or next indicator light which is the same as or close to the step pitch in distance from the currently lighted indicator light is controlled to be lighted according to the distance adjustment information, and the rest indicator lights are turned off.

In this embodiment, preferably, in another application scenario, the position indicating device includes a marking laser and a steering engine for driving the marking laser to rotate, the marking laser outputs a spot or a line spot, the central controller includes a steering engine control module, and the steering engine control module has a working process that: setting the distance between a tested person and the display as a first distance, and establishing a corresponding relation between the rotation angle of the steering engine and the first distance; after the initial distance is obtained, the steering engine control module controls the steering engine to rotate, and the rotation angle of the steering engine control module corresponds to the initial distance; after the distance adjustment information is obtained, the steering engine is controlled to rotate forwards or backwards by an angle increment on the basis of the current rotation angle according to the distance adjustment information, and the size of the angle increment corresponds to the step pitch.

In an application scenario of the intelligent self-service diopter measurement system provided by the application, a diopter test process comprises the following steps:

step S1, setting an initial distance, standing a tested person at the initial distance, shooting a front image of the tested person through a camera, acquiring the distance between the tested person and a display based on the front image, setting the distance as a first distance, judging whether the first distance is the same as the initial distance or not, and prompting the tested person to adjust if the first distance is different from the initial distance;

step S2, if the testee can clearly see the sighting target on the display at the initial distance, the refraction error is not present (if the testee is provided with the offset glasses, the refraction error is considered as the offset diopter), the retest is not needed, and if the testee cannot clearly see, the step S3 is carried out;

and S3, if the testee cannot see clearly in feedback or the error rate of the testee is greater than the error rate threshold value from the initial distance, prompting the testee to approach the display until the testee sees clearly or the error rate is less than the error rate threshold value, acquiring the first distance at the moment, and calculating the refraction error, namely the refraction degree value according to the first distance. If further fine adjustment is to be performed, go to step S4;

and S4, switching the sighting target into a red-green background sighting target, obtaining distance adjustment information for adjusting the distance according to the identification result fed back by the testee until the red-green background sighting target is seen clearly at the same time, obtaining a first distance at the moment, and obtaining a refraction error, namely a refraction degree value according to the first distance.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An intelligent self-service diopter measurement system, comprising:

the visual target display device is used for displaying the visual target to the testee;

the camera is used for shooting the front image of the tested person;

the offset glasses provide offset diopter for the testee, and the offset diopter is determined according to the historical diopter of the testee;

a feedback device through which a subject feeds back a target recognition result to the central controller;

and the central controller is used for acquiring the distance between the testee and the visual target according to the front image of the testee output by the camera and acquiring a diopter test result by combining the distance, the visual target identification result and the offset diopter.

2. The intelligent self-service diopter measurement system of claim 1 wherein said sighting target display device is a display, said display being connected to a central controller;

the display is used for displaying the sighting target, or the display is used for displaying the sighting target and the operation indication.

3. The intelligent self-service diopter measurement system of claim 2, wherein said central controller comprises a sighting target display adjusting module, said sighting target display adjusting module adjusts the linear size of sighting target in the display according to the distance between the tested person and the sighting target, the opening angle of the sighting target to human eyes is kept unchanged.

4. The self-service diopter measurement system of claim 3 wherein said sighting target display adjusting module controls the display to display the sighting target with white background first, and when the testee feeds back to see the sighting target with white background, the sighting target with red and green background is controlled to display by the display.

5. The intelligent self-help diopter measurement system of one of claims 1-4 wherein said offset eyeglasses are provided with two spaced markings, said central controller further comprising a distance acquisition module;

the distance acquisition module is used for acquiring the distance between the testee and the sighting target according to the pixel distance of the two marks in the front image of the testee, the geographic space distance of the two marks and the camera parameter.

6. The intelligent self-service diopter measurement system of claim 5 wherein said offset eyeglasses are provided with identification marks, said identification marks corresponding to the offset diopters of the offset eyeglasses one to one;

the central controller comprises an offset diopter recognition module, and the offset diopter recognition module recognizes the recognition marks in the front image of the testee to obtain the offset diopter of the offset glasses.

7. The intelligent self-service diopter measurement system of claim 6 wherein two marks are respectively provided on two lenses of the offset eyeglasses, the left mark being a left identification mark corresponding one-to-one to the offset diopter of the left lens, and the right mark being a right identification mark corresponding one-to-one to the offset diopter of the right lens;

the offset diopter identification module identifies two identification marks in the front image of the tested person to obtain the offset diopters of the two lenses.

8. The intelligent self-help diopter measurement system according to claim 1, 2, 3, 4, 6 or 7, wherein said central controller comprises a distance adjusting module, when the visual target recognition result of the tested person is that the visual target is not clear or the error rate reaches the error rate threshold, said distance adjusting module is used for obtaining the distance adjusting information of the tested person according to the visual target display state and the distance between the tested person and the visual target, said distance adjusting information includes the moving direction and/or the moving distance of the tested person.

9. The self-help diopter measurement system according to claim 8, wherein said central controller further comprises an initial distance acquisition module for setting an initial distance of the testee from the sighting target according to the historical diopter of the testee.

10. The intelligent self-service diopter measurement system of claim 9 wherein said central controller further comprises a position indication module for controlling said display to display a real-time position display area, said real-time position display area displaying said virtual image of said subject, said target position and said dynamically updating said subject's distance from said target position.