CN113367652A

CN113367652A - Eyesight detection method capable of realizing dimmable light

Info

Publication number: CN113367652A
Application number: CN202110676226.3A
Authority: CN
Inventors: 刘意; 谷中秀; 李媛媛; 马宇; 马俊磊
Original assignee: Zhengzhou Railway Vocational and Technical College
Current assignee: Zhengzhou Railway Vocational and Technical College
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-09-10

Abstract

The invention discloses a vision detection method capable of realizing dimmable light; the method comprises the following steps: s1, placing the eyes of the testee at the front end of the camera, and shielding the eyes by the light shielding plate and the lighting body on the arc-shaped screw rod in an angle crossing manner; s2, the illuminating bodies are driven to rotate and adjust on the arc-shaped screw rod by rotating the internal thread ring, and the plurality of illuminating bodies are adjusted at any positions in the same radian; s3, driving an adjusting mechanism through a third motor arranged in the illuminating body, and changing the distance between the infrared spot lamp and the lens on the connecting plate; s4, shooting images of pupils under different illumination through a camera; and S5, carrying out image processing and refraction information extraction on the shot pupil picture through a singlechip arranged in the system to obtain a human eye detection result. The comprehensive illumination is adjusted and the illumination are mutually combined, so that the higher requirement of the illumination of the vision detection is met, the accuracy of picture shooting is increased, and the detection error is reduced.

Description

Eyesight detection method capable of realizing dimmable light

Technical Field

The invention belongs to the technical field of ophthalmic instruments, and particularly relates to a vision detection method capable of realizing dimmable light.

Background

Good eyesight is an important part of health and also an important factor for ensuring individual independent life and quality of life, however, with the heavy adolescent science, myopia of children and teenagers is gradually increased, and premature wearing of glasses not only affects life and study of children, but also affects participation of children in sports activities and labor, so that children are not high in participation enthusiasm, and even normal development of children is affected, eyes are deformed, and images are affected. Although myopes are increasing, they can return to normal if they are discovered prematurely and treated promptly. At present, eye examination is mostly carried out in a pupil expanding and visual electrophysiological way, examination is carried out by collecting electric signal change of an exercise report, an examinee often feels discomfort, and the physiological stimulation to eyes is too large, so that certain side effects are caused

Meanwhile, for the existing inspection equipment, a common fixed light source is generally adopted to be matched with a diaphragm to serve as eye light supplement equipment, the fixed light source can only simply adjust the brightness, the illumination angle adjustment is inconvenient to carry out, the illumination adjustment is limited in actual detection, and the detection accuracy is influenced; the adjustment by using the diaphragm is limited only by the adjustment of the illumination intensity in the same direction, the adjustment is limited, and the parallel light source is directly adopted to directly irradiate human eyes, so that the stimulation intensity to the human eyes is high, and the discomfort of a patient is easily caused; and the traditional detection system has overlarge volume, high price and complicated use steps, and can be used only by operating by professional personnel.

Chinese patent application No. 201921014517.0 discloses a vision testing device and apparatus. The vision detection device comprises a guide cylinder, an optical lens group and a position detection mechanism. The guide cylinder comprises a first end part and a second end part, wherein the first end part is used for being close to eyes of a human body, and the second end part is used for being close to the sighting mark display device. The optical lens group is arranged in the guide cylinder and used for zooming the sighting target displayed on the sighting target display device, and the position detection mechanism is arranged on the second end part and used for detecting whether the vision detection device is arranged on the sighting target display device or not and whether the position arranged on the sighting target display device is accurate or not. The vision detection equipment comprises a sighting target display device and a vision detection device, wherein the sighting target display device is arranged on the second end part. According to the technical scheme, the requirement of detection on light adjustment is difficult to achieve only through reflection of the optical lens, and the requirement of vision detection on adjustable light is not enough.

Chinese patent application No. 202011220911.7 discloses an eye vision test device, which relates to the technical field of auxiliary equipment for vision test, and comprises a vision test chart and an adjusting box, wherein the left side of the vision test chart is provided with a lifting box body, the lifting box body is internally provided with a screw rod I, the surface of the screw rod I is provided with a nut I, the nut I is rotationally connected with a rotating roller, the right side of the vision test chart is provided with a supporting box body, a dust collector is arranged above the supporting box body, the nut I drives the rotating roller and a cleaning brush to reciprocate on the surface of the vision test chart, clear up the dust on visual detection table surface, the dust catcher with the dust on visual detection table surface inhale to the rose box in filter, nut two drive visual detection table and remove about the horizontal direction, adjust its horizontal direction's position, the telescopic link promotes sliding seat and regulating box horizontal migration, adjusts the distance between visual detection table and the visual detection personnel. Above-mentioned technical scheme adopts traditional visual acuity test table to detect, can only roughly detect whether near-sighted, can not carry out accurate detection.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a vision detection method capable of adjusting light, which can adjust the direction, the intensity and the brightness of light rays of vision detection by arranging an illuminating mechanism, meet the requirements of the vision detection on the light rays under different working conditions and reduce the light stimulation of the vision detection on human eyes; control module passes through the control motor group, adjusts the focus of arc lead screw, anti-dazzling screen and infrared spot lamp, rotates on arc lead screw through the internal thread ring simultaneously, drives the illuminating body and shines the light angular adjustment, and the comprehensive illumination of being directed at is adjusted, mutual combined action, the higher requirement that the illumination that makes vision detection reaches has increased the accuracy of taking the picture to reduce detection error.

The invention provides the following technical scheme:

a vision detection method for realizing adjustable light; the method comprises the following steps:

s1, the eyes of the testee are arranged at the front end of the camera, the first motor drives the arc-shaped screw rod to rotate on the horizontal plane, different irradiation angles of the illuminating body on the horizontal plane are adjusted, the second motor drives the light shielding plate to rotate, and the light shielding plate and the illuminating body on the arc-shaped screw rod form an angle intersection for shielding;

s2, the illuminating bodies are driven to rotate and adjust on the arc-shaped screw rod by rotating the internal thread ring, and the plurality of illuminating bodies are adjusted at any positions in the same radian;

s3, driving an adjusting mechanism through a third motor arranged in the illuminating body, changing the distance between the infrared spot lamp on the connecting plate and the lens so as to change the focal length, forming diffused light through the lens and enabling the illumination intensity of each point on the pupil to be equal;

s4, the illuminating mechanism emits infrared light into human eyes through the semi-transparent semi-return mirror, the infrared light is reflected into the camera through the semi-transparent semi-return mirror and the infrared filter after refraction of the human eyes, and images of pupils under different illumination are shot through the camera;

and S5, carrying out image processing and refraction information extraction on the shot pupil picture through a singlechip arranged in the system to obtain a human eye detection result.

Preferably, in step S5, the image processing includes image segmentation and feature extraction, and the feature extraction includes pupil region feature extraction and cornea reflection point region feature extraction.

Preferably, the pupil region feature extraction method includes: a, performing binarization processing on an acquired through hole image, adjusting a threshold parameter, performing threshold segmentation on a pupil image, performing time domain, frequency domain and time-frequency domain feature extraction on the pupil image, and marking the through hole region as a maximum connected region; b, finding out the maximum connected domain in the pupil image, marking the maximum connected domain, and setting other areas marked as the maximum connected domain as 0; and c, acquiring the area of the connected domain according to the region in the extracted through hole image.

Preferably, the feature extraction method of the corneal light reflecting point area comprises the following steps: a, adjusting the brightness and contrast of the through hole image, and performing enhancement processing; then carrying out binarization processing, and preliminarily extracting a crescent area in the through hole; and B, extracting the area of the connected region of the image obtained in the step A, setting the area of the pupil region as S, and marking the connected region with the area larger than S/100 as a minimum connected region.

Preferably, the feature extraction method for the corneal light reflecting point area further comprises: c, finding out the minimum connected domain for marking, and setting other areas outside the mark as 0; extracting corneal reflection points; d, finding out and marking the maximum connected domain in the pupil image in the step A, and setting other areas marked as the maximum connected domain as 0; and E, extracting the crescent area of the pupil image to obtain the area of the connected domain.

Preferably, the pupil image presents different diopters due to different myopia degrees, for high myopia, the irradiation result connected domain area value far away from the central point is the distance of medium myopia inferior to high myopia, the low myopia is regarded as the irradiation result connected domain area value far away from the central point, and the connected domain area value is the myopia degree value.

A vision detection method for realizing adjustable light adopts a vision detection system; comprises a camera and a semi-transparent half-returning mirror; an illuminating mechanism is arranged below the semi-transparent semi-reflecting mirror and used for adjusting illumination, the illuminating mechanism comprises a base, a first motor is arranged above the base, an output shaft of the first motor is connected with an arc-shaped lead screw in a driving mode, a plurality of illuminating bodies are arranged on the arc-shaped lead screw, infrared spot lamps are arranged inside the illuminating bodies and connected with an adjusting mechanism, and the adjusting mechanism is used for adjusting the light emitting angle, the focal length and the light emitting distance of the infrared spot lamps;

the detection system also comprises a singlechip, wherein the singlechip is provided with a control module, the control module is connected with and controls the driving of a motor set, and the motor set comprises a first motor, a second motor and a third motor; the control module is also in control connection with a shooting module, and the shooting module comprises a camera; the singlechip also comprises an image processing module and a refraction information extraction module, and the image processing module processes the image shot by the camera.

Preferably, the output shaft of the first motor is connected to the center of the arc-shaped screw rod, one side of the arc-shaped screw rod, which is far away from the first motor, is connected with a second motor, the output shaft of the second motor is in driving connection with a light shielding plate, the light shielding plate is transparent or non-transparent, the color is colored or colorless, and the light shielding plate has a multilayer structure.

Preferably, one end of the illuminating body arranged on the arc-shaped screw rod is provided with an internal thread ring, and the internal thread ring is in matched rotary connection with the arc-shaped screw rod; the arc-shaped screw rod takes the output shaft of the first motor as the center, and the two sides of the arc-shaped screw rod are provided with the same number of illuminating bodies.

Preferably, an I-shaped sliding groove is formed in the center of the outer side wall of the internal thread ring along the circumferential direction, a fixing groove is formed in the center of the outer side wall of the internal thread ring along the axial direction, and the fixing groove is intersected with the sliding groove; one end of the illuminating body is connected with a connecting rod, the other end of the connecting rod is arranged in the sliding groove through a connected sliding head, the illuminating body slides in the sliding groove through the connecting rod, rotates along the circumferential direction of the internal thread ring and is fixed through a fixing groove which is axially formed.

Preferably, the inside hollow structure that is of illuminating body, the inside of illuminating body is equipped with the baffle, one side of baffle is equipped with the third motor, third motor output can walk and run through the baffle, and is connected with the shaft coupling, the other end of shaft coupling is connected with the threaded rod, be equipped with adjustment mechanism on the threaded rod.

Preferably, adjustment mechanism includes the fixed plate, the central point of fixed plate puts set up threaded hole, and the fixed plate passes through the screw hole to be connected with threaded rod matching rotation, one side that the shaft coupling was kept away from to the fixed plate is equipped with two backup pads of symmetric connection, two the other end of backup pad all is connected with the connecting plate, the opposite side of connecting plate is equipped with multiunit infrared spot lamp, the one end that the third motor was kept away from to the illuminating body is equipped with lens.

Preferably, the infrared spot lamps are LED lamps, and the plurality of infrared spot lamps are distributed in an array mode along the circumferential direction of the connecting plate.

Preferably, two the bar groove has all been seted up to the relative inboard of backup pad, the cross-section in bar groove is "worker" style of calligraphy, and the threaded rod is kept away from the one end of shaft coupling and is connected with the stopper, the both ends of stopper all are connected with the slider, slider and bar groove matching sliding connection.

Preferably, the illumination mechanism emits infrared light into human eyes through the semi-transparent semi-return mirror, the infrared light is reflected into the camera through the infrared filter by the semi-transparent semi-return mirror after refraction of the human eyes, images of pupils under different illumination are shot through the camera, and the images are processed and refraction information is extracted through a single chip microcomputer arranged in the system to obtain human eye detection results.

In addition, when the lighting mechanism is adjusted, the motor set is controlled by the single chip microcomputer, the first motor drives the arc-shaped screw rod to rotate 360 degrees on the horizontal plane, different irradiation angles of the lighting body on the horizontal plane are adjusted, after the angle is adjusted by the first motor, the light shading plate is driven by the second motor to rotate according to the lighting requirement of the detection system, and the light shading plate is selectively covered by crossing the angle of the lighting body on the arc-shaped screw rod so as to meet different lighting requirements in detection time. The light screen adopts transparent ya keli material, and the multilayer bonds together, and different colours and the film of transmittance can be glued to yakeli light screen according to the demand, finely tunes bright light and shade. After the position adjustment of light screen and arc lead screw, rotate the regulation through rotating the internal thread zone and moving the illuminating body on arc lead screw, realize a plurality of illuminating bodies and adjust in same radian optional position, can prevent that the illuminating body from sliding simultaneously. When the illuminators rotate, after the position of each internal thread ring is adjusted, the connecting rod rotates in the circumferential direction of the internal thread ring in the sliding groove through the sliding groove formed in the surface of the internal thread ring, the connecting rod is limited through the fixing groove formed in the outer wall of the internal thread ring in the axial direction, the connecting rod is prevented from freely sliding in the sliding groove, the direction formed in the fixing groove faces the semi-transparent half-returning mirror, and by means of the adjusting mode, the adjustment of different illuminators at any angle on the arc-shaped screw rod is met, so that the incident light of human eyes is finely adjusted, when the angle of the internal thread ring is adjusted on the arc-shaped screw rod, the local illumination range can be reduced, and under the condition that the overall darkness is low, columnar light with a small uniform range is generated, the local illumination of pupils of the human eyes is met, and the definition of images shot by a camera is increased. When making adjustments, in order to produce uniformityThe illumination is more uniform, the distance between two adjacent illuminators is L, the included angle theta of an arc line on the arc lead screw and the arc length radius between two adjacent illuminators are R, the distance from the first illuminator to the center of the arc lead screw is D1, and the distance from the second illuminator to the center of the arc lead screw is D2; l = λ · cos θ R (D1-D2); wherein units of L, R, D1 and D2 are mm; the unit of theta is rad, lambda is a relation coefficient, and the value range is 0.45-0.89. B is_n-B_n-1= β · 1/2 n; in the formula: b is_n-B_n-1Is the straight-line distance between the nth illuminant and the n-1 illuminants, and has the unit of mm; β is the correlation coefficient: the value range is 3.23-18.63.

When λ is 0.45, θ is π/2, R is 50mm, D1 is 50mm, D2 is 20mm, L is 32.97mm, and β is 5, B_n-B_n-1Distance between 1 st illuminant and 2 illuminants, B_n-B_n-1The value is 1.15, the diffusion effect of the columnar light is the best when the illuminator is at D1/2, and the illumination intensity of each point on the pupil is equal.

In addition, at first motor, after angle has been adjusted to second motor and internal thread ring, rotate through single chip microcomputer control third motor, the third motor passes through the shaft coupling and drives the threaded rod rotation, when the threaded rod pivoted, the fixed plate rotates through the matching with the threaded rod and is connected, take place to remove on the threaded rod, the stopper and the slider that the threaded rod tip set up simultaneously carry on spacingly to the threaded rod, and the slider slides in the bar inslot, indirectly drive backup pad and connecting plate through the fixed plate and remove, with this distance between infrared spotlight and the lens on the change connecting plate, thereby change the focus, form the diffusion light through lens, make the illumination intensity of each point on the pupil equal, reduce the amazing of parallel light to the eyeball pupil. Through the infrared shot-light array that uses the hexagon to set up as the center on the connecting plate, cooperation lighting mechanism's regulation, whole pupil all can be illuminated, and every point light source all can form a circular dispersed facula on the retina, and the diffuse spot on the retina refracts out through the dioptric system of diffuse reflection bar light through people's eye, when carrying out image acquisition through the camera, will obtain circular picture, reduces image processing's the degree of difficulty of cutting apart. In the irradiation process, in order to increase the accuracy of shooting and reduce the complexity of post-processing, the illumination intensity of each point on the pupil is equal, and the coordinates of the illuminator are (a, b, c); the diameter of the pupil is d, the distance between the light source and the through hole is M, and the radius r of the projection circle of the point of the illuminating body on the eye satisfies the following conditions: r = d ((1/M) -1)/2; the coordinates (x, y) of the center of the projection circle of the point of the illuminating body on the eye satisfy: x = a + (1-1/M)) a; y = b + (1-1/M)) b.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the vision detection method capable of adjusting light, the direction, the intensity and the brightness of light rays for vision detection are adjusted by arranging the lighting mechanism, so that the requirements of the vision detection on the light rays under different working conditions are met, and the light stimulation of the vision detection on human eyes is reduced.

(2) The invention relates to a vision detection method capable of adjusting light, wherein a control module adjusts the focal lengths of an arc-shaped screw rod, a shading sheet and an infrared spotlight by controlling a motor set, and simultaneously drives an illuminator to adjust the angle of illumination light by rotating on the arc-shaped screw rod through an internal thread ring, so that the illumination of vision detection can meet higher requirements under the mutual combined action of the illumination angle adjustment and the illumination angle adjustment, and the accuracy of picture shooting is improved, thereby reducing detection errors.

(3) According to the vision detection method capable of realizing light modulation, the adjustment of any angle of different illuminants on the arc-shaped screw rod is met through the adjustment mode of interaction among the arc-shaped screw rod, the light shading plate and the internal thread ring, so that the fine adjustment of the incident light of human eyes is achieved, when the internal thread ring adjusts the angle on the arc-shaped screw rod, the local illumination range can be narrowed, and under the condition that the overall darkness is low, columnar light with a smaller uniform range is generated to meet the local illumination of pupils of the human eyes, and the increase of the definition of images shot by a camera is facilitated.

(4) The vision detection method for realizing the dimmable vision of the invention indirectly drives the supporting plate and the connecting plate to move through the fixing plate so as to change the distance between the infrared spotlight on the connecting plate and the lens, thereby changing the focal length, forming the diffused light through the lens, enabling the illumination intensity of each point on the pupil to be equal, and reducing the stimulation of parallel light to the eyeball pupil. Through the infrared shot-light array that uses the hexagon to set up as the center on the connecting plate, cooperation lighting mechanism's regulation, whole pupil all can be illuminated, and every point light source all can form a circular dispersed facula on the retina, and the diffuse spot on the retina refracts out through the dioptric system of diffuse reflection bar light through people's eye, when carrying out image acquisition through the camera, will obtain circular picture, reduces image processing's the degree of difficulty of cutting apart.

(5) According to the vision detection method capable of adjusting light, provided by the invention, by limiting the relationship among the distance between two adjacent illuminants, the included angle and the arc length radius of the arc on the arc-shaped screw rod corresponding to the two adjacent illuminants, and the distance from the illuminants to the center of the arc-shaped screw rod, uniform columnar light is generated, the light is more uniform, and the light effect is further improved.

(6) The vision detection method for realizing the dimmable vision further increases the accuracy of shooting and reduces the complexity of post processing by limiting the relationship among the coordinates of the illuminating body, the diameter of the pupil and the distance between the light source and the through hole, so that the illumination intensity of each point on the pupil is equal.

(7) According to the vision detection method for realizing the dimmable light, disclosed by the invention, the diopter of the through hole is determined by calculating the area ratio of the pupil crescent area to the through hole, the measurement error is reduced, and the detection accuracy is improved. And the illumination mechanism is combined with the condition that the illumination intensity of each point on the pupil is equal, and the feature extraction method is combined, so that the illumination intensity of each point on the pupil is combined with the feature extraction method, and the accuracy of vision detection is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the illumination mechanism of the present invention.

Fig. 3 is a partially enlarged schematic view a of the present invention.

FIG. 4 is a schematic cross-sectional view of the internally threaded ring of the present invention.

Fig. 5 is a schematic view of the internally threaded ring structure of the present invention.

Fig. 6 is a schematic view of the internal structure of the illuminating body of the present invention.

Fig. 7 is a top view of the arch lead screw of the present invention.

FIG. 8 is a schematic view of the distribution of the IR spot light of the present invention.

Fig. 9 is a system block diagram of the present invention.

FIG. 10 is a flow chart of a method of the present invention.

In the figure: 1. an illumination mechanism; 2. a camera; 3. a semi-transparent half-returning mirror; 4. an infrared filter; 11. a base; 12. A first motor; 13. an arc-shaped screw rod; 14. an internally threaded ring; 15. an illuminating body; 16. a second motor; 17. a visor; 18. a connecting rod; 19. a chute; 20. fixing grooves; 151. a third motor; 152. a partition plate; 153. a coupling; 154. a threaded rod; 155. a fixing plate; 156. a support plate; 157. a limiting block; 158. a slider; 159. a strip-shaped groove; 1510. a connecting plate; 1511. an infrared spot lamp; 1512. a lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The first embodiment is as follows:

as shown in fig. 10, a vision testing method for realizing adjustable light; the method comprises the following steps:

In step S5, the image processing includes image segmentation and feature extraction, and the feature extraction includes pupil region feature extraction and cornea reflection point region feature extraction.

The pupil region feature extraction method comprises the following steps: a, performing binarization processing on an acquired through hole image, adjusting a threshold parameter, performing threshold segmentation on a pupil image, performing time domain, frequency domain and time-frequency domain feature extraction on the pupil image, and marking the through hole region as a maximum connected region; b, finding out the maximum connected domain in the pupil image, marking the maximum connected domain, and setting other areas marked as the maximum connected domain as 0; and c, acquiring the area of the connected domain according to the region in the extracted through hole image.

The extraction method of the features of the cornea light reflecting point area comprises the following steps: a, adjusting the brightness and contrast of the through hole image, and performing enhancement processing; then carrying out binarization processing, and preliminarily extracting a crescent area in the through hole; and B, extracting the area of the connected region of the image obtained in the step A, setting the area of the pupil region as S, and marking the connected region with the area larger than S/100 as a minimum connected region.

The feature extraction method for the cornea light reflecting point area further comprises the following steps: c, finding out the minimum connected domain for marking, and setting other areas outside the mark as 0; extracting corneal reflection points; d, finding out and marking the maximum connected domain in the pupil image in the step A, and setting other areas marked as the maximum connected domain as 0; and E, extracting the crescent area of the pupil image to obtain the area of the connected domain.

The pupil images show different diopters due to different myopia degrees, for high myopia, the irradiation result connected domain area value far away from the central point is the distance of the high myopia, the medium myopia is inferior to the distance of the high myopia, the low myopia is regarded as the irradiation result connected domain area value far away from the central point, and the connected domain area value is the myopia distance value.

Example two:

as shown in fig. 1, a vision testing system based on adjustable light; comprises a camera 2 and a plate head half-returning mirror 3; the utility model discloses a lighting device, including the wrench end, the wrench end is partly returned 3 below of mirror and is equipped with lighting mechanism 1, lighting mechanism 1 carries out illumination regulation, lighting mechanism 1 includes base 11, and base 11 top is equipped with first motor 12, and the output shaft drive of first motor 12 is connected with arc lead screw 13, be equipped with a plurality of illuminating bodies 15 on the arc lead screw 13, illuminating body 15 inside is equipped with infrared spotlight 1511, and infrared spotlight 1511 is connected with adjustment mechanism, and adjustment mechanism adjusts infrared spotlight 1511's angle of shine, focus, distance of shine. The illuminating mechanism 1 emits infrared light into human eyes through the plate head half-returning mirror 3, the infrared light is reflected into the camera through the infrared filter 4 by the plate head half-returning mirror 3 after refraction of the human eyes, images of pupils under different illumination are shot through the camera, and the images are processed and refraction information is extracted through a single chip microcomputer arranged in the system to obtain human eye detection results.

Example three:

as shown in fig. 2-5 and 7, based on the first embodiment, the output shaft of the first motor 12 is connected to the center of the arc-shaped screw 13, one side of the arc-shaped screw 13 away from the first motor 12 is connected to a second motor 16, the output shaft of the second motor 16 is connected to a light shielding plate 17 in a driving manner, the light shielding plate 17 is transparent or non-transparent, the color is colored or colorless, and the light shielding plate 17 has a multilayer structure.

An internal thread ring 14 is arranged at one end of each illuminating body 15 arranged on the arc-shaped screw rod 13, and the internal thread rings 14 are connected with the arc-shaped screw rods 13 in a matching and rotating mode; the arc-shaped screw rod 13 is provided with the same number of illuminating bodies 15 by taking the output shaft of the first motor 12 as the center.

An I-shaped sliding groove 19 is formed in the center of the outer side wall of the internal thread ring 14 along the circumferential direction, a fixing groove 20 is formed in the center of the outer side wall of the internal thread ring 14 along the axial direction, and the fixing groove 20 is intersected with the sliding groove 19; one end of the illuminating body 15 is connected with a connecting rod 18, the other end of the connecting rod 18 is arranged in a sliding groove 19 through a connected sliding head, the illuminating body 15 slides in the sliding groove 19 through the connecting rod 18, rotates along the circumferential direction of the internal thread ring 14, and is fixed through a fixing groove 20 which is axially formed.

In addition, when the lighting mechanism 1 is adjusted, the motor set is controlled by a single chip microcomputer, the first motor 12 drives the arc-shaped screw rod 13 to rotate for 360 degrees on the horizontal plane, different irradiation angles of the lighting body 15 on the horizontal plane are adjusted, after the angle is adjusted by the first motor 12, the light shielding plate 17 is driven by the second motor 16 to rotate according to the lighting requirement of the detection system, and the light shielding plate is selectively covered by crossing the angle of the lighting body 15 on the arc-shaped screw rod 13 so as to meet different lighting requirements in the detection time. The light screen 17 adopts transparent ya keli material, and the multilayer bonds together, and different colours and the film of transmittance can be glued according to the demand to ya keli light screen 17, finely tunes bright light and shade. After the positions of the light screen 17 and the arc-shaped screw rod 13 are adjusted, the internal thread ring 14 is rotated to drive the illuminating body 15 to be in an arcThe shape screw 13 is rotated and adjusted, so that the plurality of illuminating bodies 15 can be adjusted at any position in the same radian, and the illuminating bodies 15 can be prevented from sliding. And when the illuminating body 15 is rotated, after the position of each internally threaded ring 14 is adjusted, the connecting rod 18 rotates along the circumferential direction of the internal thread ring 14 in the sliding slot 19 through the sliding slot 19 opened on the surface of the internal thread ring 14, the connecting rod 18 is limited by a fixing groove 20 which is arranged on the outer wall of the internal thread ring 14 along the axial direction, the connecting rod 18 is prevented from freely sliding in the sliding groove 19, the direction of the fixing groove 20 is towards the plate head half-returning mirror 3, by the adjusting mode, the adjustment of any angle of different illuminants 15 on the arc-shaped screw rod 13 is met, thereby achieving the fine adjustment of incident light to human eyes, therefore, when the angle of the internal thread ring 14 is adjusted on the arc-shaped screw rod 13, the local illumination range can be reduced, under the condition that the overall darkness is low, columnar light with a small uniform range is generated to meet the requirement of local illumination on pupils of human eyes, and the definition of images shot by the camera is increased. When the adjustment is carried out, in order to generate uniform columnar light, the illumination is more uniform, the distance between two adjacent illuminating bodies 15 is L, the included angle theta and the arc length radius of the arc line on the arc-shaped screw rod 13 between two adjacent illuminating bodies 15 are R, the distance from the first illuminating body 15 to the center of the arc-shaped screw rod 13 is D1, and the distance from the second illuminating body 15 to the center of the arc-shaped screw rod 13 is D2; l = λ · cos θ R (D1-D2); wherein units of L, R, D1 and D2 are mm; the unit of theta is rad, lambda is a relation coefficient, and the value range is 0.45-0.89. B is_n-B_n-1= β · 1/2 n; in the formula: b is_n-B_n-1Is the straight-line distance between the nth illuminant 15 to the n-1 illuminants 15 in mm; β is the correlation coefficient: the value range is 3.23-18.63.

Example four:

as shown in fig. 6 and 8, in the first embodiment, the inside of the illuminating body 15 is a hollow structure, a partition plate 152 is disposed inside the illuminating body 15, a third motor 151 is disposed on one side of the partition plate 152, an output of the third motor 151 penetrates through the partition plate 152 and is connected to a coupler 153, a threaded rod 154 is connected to the other end of the coupler 153, and an adjusting mechanism is disposed on the threaded rod 154.

Adjustment mechanism includes fixed plate 155, the central point of fixed plate 155 puts and has seted up threaded hole, and fixed plate 155 matches through screw hole and threaded rod 154 and rotates and be connected, one side that shaft coupling 153 was kept away from to fixed plate 155 is equipped with two backup pads 156 of symmetric connection, two the other end of backup pad 156 all is connected with connecting plate 1510, the opposite side of connecting plate 1510 is equipped with multiunit infrared shot-light 1511, the one end that third motor 151 was kept away from to illuminating body 15 is equipped with lens 1512.

The infrared shot-light 1511 is the LED lamp, and a plurality of infrared shot-lights 1511 are array distribution along the circumference of connecting plate 1510.

Two a strip groove 159 has all been seted up to the relative inboard of backup pad 156, strip groove 159's cross-section is "worker" style of calligraphy, and the threaded rod 154 is kept away from the one end of shaft coupling 153 and is connected with stopper 157, the both ends of stopper 157 all are connected with slider 158, slider 158 and strip groove 159 match sliding connection.

In addition, after the angles of the first motor 12, the second motor 16 and the internal thread ring 14 are adjusted, the third motor 151 is controlled to rotate by the single chip microcomputer, the third motor 151 drives the threaded rod 154 to rotate through the coupler 153, while the threaded rod 154 rotates, the fixing plate 155 is in matching rotating connection with the threaded rod 154 and moves on the threaded rod 154, meanwhile, the limit block 157 and the sliding block 158 arranged at the end part of the threaded rod 154 limit the threaded rod 154, the sliding block 158 slides in the strip-shaped groove 159, the supporting plate 156 and the connecting plate 1510 are indirectly driven to move through the fixing plate 155, so that the distance between the infrared spot light 1511 on the connecting plate 1510 and the lens 1512 is changed, the focal length is changed, the diffusion light is formed through the lens, the illumination intensity of each point on the pupil is equal, and the stimulation of the parallel light to the eyeball pupil is reduced. Through the infrared shot-light 1511 array that uses the hexagon to set up as the center on connecting plate 1510, cooperation lighting mechanism 1's regulation, whole pupil all can be illuminated, and every point light source all can form a circular dispersed facula on the retina, and the diffuse spot on the retina refracts out through the dioptric system of diffuse reflection bar light through people's eye, when carrying out image acquisition through camera 2, will obtain circular picture, reduces image processing's the segmentation degree of difficulty. In the irradiation process, in order to increase the accuracy of image pickup and reduce the complexity of post-processing, the illumination intensity of each point on the pupil is equal, and the coordinates of the illuminating body 15 are a, b and c; the diameter of the pupil is d, the distance between the light source and the through hole is M, and the radius r of the projection circle of the point of the illuminating body 15 on the eye satisfies: r = d (1/M-1)/2; the center coordinates x, y of the projection circle of the point of the illuminating body 15 on the eye satisfy: x = a + (1-1/M) a; y = b + (1-1/M) b.

EXAMPLE five

As shown in fig. 9, on the basis of the first embodiment, the detection system further includes a single chip microcomputer, the single chip microcomputer is provided with a control module, the control module is connected to control a motor set to drive, and the motor set includes a first motor 12, a second motor 16, and a third motor 151; the control module is also in control connection with a shooting module, and the shooting module comprises a camera 2; the singlechip further comprises an image processing module and a refraction information extraction module, and the image processing module processes the image shot by the camera 2.

EXAMPLE six

On the basis of example three, when λ is 0.45, θ is π/2, R is 50mm, D1 is 50mm, D2 is 20mm, L is 32.97mm, and β is 5, B is_n-B_n-1Distance between the 1 st illuminating body 15 and the 2 nd illuminating body 15, B_n-B_n-1The value is 1.15, the diffusion effect of the columnar light is best when the distance of the illuminator 15 is D1/2, and the illumination intensity of each point on the pupil is equal.

EXAMPLE seven

On the basis of example three, when λ is 0.6, θ is 2 π/3, R is 70mm, D1 is 70mm, D2 is 30mm, L is 30.24mm, and β is 7, B is_n-B_n-1Distance between the 2 nd illuminating body 15 and the 3 rd illuminating body 15, B_n-B_n-1The value is 1.20, the diffusion effect of the columnar light is best when the distance of the illuminator 15 is 2D1/3, and the illumination intensity of each point on the pupil is equal.

The device that obtains through above-mentioned technical scheme is a visual detection method who realizes can adjusting luminance, carries out direction, intensity, light and shade through setting up lighting mechanism to the light that visual detection carries out and adjusts, satisfies visual detection under the different operating modes demand to light, reduces visual detection and to the light stimulation of people's eye. Control module passes through the control motor group, adjusts the focus of arc lead screw, anti-dazzling screen and infrared spot lamp, rotates on arc lead screw through the internal thread ring simultaneously, drives the illuminating body and shines the light angular adjustment, and the comprehensive illumination of being directed at is adjusted, mutual combined action, the higher requirement that the illumination that makes vision detection reaches has increased the accuracy of taking the picture to reduce detection error. Through arc-shaped lead screw, light screen, the adjustment mode of the interact between the internal thread ring, satisfy the regulation of different illuminating bodies arbitrary angle on arc-shaped lead screw, thereby reach the fine setting to people's eye incident light, so the internal thread ring when angle of adjustment is carried out on arc-shaped lead screw, can dwindle local illumination scope, under the lower condition of whole darkness, produce the less column light of even scope, in order to satisfy the local illumination to people's eye pupil, help increasing the definition that the camera shot the image. The fixed plate indirectly drives the supporting plate and the connecting plate to move, so that the distance between the infrared spotlight and the lens on the connecting plate is changed, the focal length is changed, the diffusion light is formed through the lens, the illumination intensity of each point on the pupil is equal, and the stimulation of parallel light to the eyeball pupil is reduced. Through the infrared shot-light array that uses the hexagon to set up as the center on the connecting plate, cooperation lighting mechanism's regulation, whole pupil all can be illuminated, and every point light source all can form a circular dispersed facula on the retina, and the diffuse spot on the retina refracts out through the dioptric system of diffuse reflection bar light through people's eye, when carrying out image acquisition through the camera, will obtain circular picture, reduces image processing's the degree of difficulty of cutting apart. Through the contained angle and the arc length radius of the pitch arc that inject distance between two adjacent illuminating bodies, two adjacent illuminating bodies between correspond arc lead screw on, illuminating body to the relation between the distance at arc lead screw center, produce even column light, illumination is more even, further promotes the illumination effect. The camera shooting accuracy is further improved and the complexity of post processing is reduced by limiting the relation among the coordinate of the illuminating body, the diameter of the pupil and the distance between the light source and the through hole, so that the illumination intensity of each point on the pupil is equal; the diopter of the through hole is determined by calculating the area ratio of the pupil crescent area to the through hole, so that the measurement error is reduced, and the detection accuracy is improved. And the illumination mechanism is combined with the condition that the illumination intensity of each point on the pupil is equal, and the feature extraction method is combined, so that the illumination intensity of each point on the pupil is combined with the feature extraction method, and the accuracy of vision detection is further improved.

Other technical solutions not described in detail in the present invention are prior art in the field, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vision detection method for realizing adjustable light; the method is characterized by comprising the following steps:

s1, the eyes of the testee are arranged at the front end of the camera, the first motor drives the arc-shaped screw rod to rotate on the horizontal plane, different irradiation angles of the illuminating body on the horizontal plane are adjusted, the second motor drives the light shielding plate to rotate, and the light shielding plate and the illuminating body on the arc-shaped screw rod form an angle intersection;

s4, the illuminating mechanism emits infrared light into the tested eye through the semi-transparent half-returning mirror, the infrared light is reflected into the camera through the semi-transparent half-returning mirror after refraction of the eye, and images of the pupil under different illumination are shot through the camera;

and S5, carrying out image processing and refraction information extraction on the shot pupil picture through the system singlechip to obtain a detection result.

2. The method for vision testing with adjustable light according to claim 1, wherein in step S2, when the illumination body rotates, after the position of each internal thread ring is adjusted, the connecting rod rotates in the sliding groove along the circumferential direction of the internal thread ring through the sliding groove formed on the surface of the internal thread ring, and the connecting rod is limited by the fixing groove formed on the outer wall of the internal thread ring along the axial direction, so as to prevent the connecting rod from freely sliding in the sliding groove.

3. The vision testing method with adjustable light according to claim 2, wherein in step S5, the image processing includes image segmentation and feature extraction, and the feature extraction includes pupil region feature extraction and cornea reflection point region feature extraction.

4. The vision testing method with adjustable light according to claim 3, wherein the pupil area feature extraction method comprises: a, performing binarization processing on an acquired through hole image, adjusting a threshold parameter, performing threshold segmentation on a pupil image, performing time domain, frequency domain and time-frequency domain feature extraction on the pupil image, and marking the through hole region as a maximum connected region; b, finding out the maximum connected domain in the pupil image, marking the maximum connected domain, and setting other areas marked as the maximum connected domain as 0; and c, acquiring the area of the connected domain according to the region in the extracted through hole image.

5. The vision testing method of claim 3, wherein the feature extraction method of the cornea light mapping point area is as follows: a, adjusting the brightness and contrast of the through hole image, and performing enhancement processing; then carrying out binarization processing, and preliminarily extracting a crescent area in the through hole; and B, extracting the area of the connected region of the image obtained in the step A, setting the area of the pupil region as S, and marking the connected region with the area larger than S/100 as a minimum connected region.

6. The vision testing method with adjustable light according to claim 5, wherein the feature extraction method for corneal light mapping point area further comprises: c, finding out the minimum connected domain for marking, and setting other areas outside the mark as 0; extracting corneal reflection points; d, finding out and marking the maximum connected domain in the pupil image in the step A, and setting other areas marked as the maximum connected domain as 0; and E, extracting the crescent area of the pupil image to obtain the area of the connected domain.

7. The method of claim 5, wherein the pupil images have different diopters due to different degrees of myopia, and for high myopia, the illumination result connected domain area value far from the central point is a distance that is inferior to high myopia, the low myopia is regarded as the illumination result connected domain area value far from the central point, and the connected domain area value is the myopia degree value.