CN113907699B - A vision measuring device and control method thereof - Google Patents
A vision measuring device and control method thereof Download PDFInfo
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- CN113907699B CN113907699B CN202111340772.6A CN202111340772A CN113907699B CN 113907699 B CN113907699 B CN 113907699B CN 202111340772 A CN202111340772 A CN 202111340772A CN 113907699 B CN113907699 B CN 113907699B
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- 230000004438 eyesight Effects 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 50
- 230000007613 environmental effect Effects 0.000 claims abstract description 37
- 210000001747 pupil Anatomy 0.000 claims description 32
- 238000003491 array Methods 0.000 claims description 10
- 238000005286 illumination Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 8
- 201000009310 astigmatism Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 241000842962 Apoda limacodes Species 0.000 description 2
- 206010020675 Hypermetropia Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004305 hyperopia Effects 0.000 description 2
- 201000006318 hyperopia Diseases 0.000 description 2
- 208000001491 myopia Diseases 0.000 description 2
- 230000004379 myopia Effects 0.000 description 2
- 210000001525 retina Anatomy 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/028—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for testing visual acuity; for determination of refraction, e.g. phoropters
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Abstract
The invention discloses a vision measuring device and a control method thereof, wherein the vision measuring device comprises a shell, an infrared light source module, a camera module, an environmental factor monitoring module, a control processing module and a display module, wherein an attention attracting module for attracting attention is also arranged in the shell. The invention discloses a vision measuring device and a control method thereof, which are provided with an attention attracting module for attracting the attention of infants. During measurement, the infant is attracted by the attention attracting module, eyes can look at the vision measuring device, vision measurement of the infant can be rapidly completed, accuracy of vision measurement results is improved, and performance of products is improved.
Description
Technical Field
The invention relates to the technical field of vision measurement or detection, in particular to a vision measurement device and a control method thereof.
Background
The vision measuring device is used for measuring diopter of eyes to evaluate vision condition of the eyes and provide reference for lens matching.
The diopter detection method comprises a double-slit photographic optometry method, an eccentric photographic optometry method and the like. The double slit photographic optometry and the eccentric photographic optometry are based on the gradient of brightness in the pupil of human eye. That is, the image of the photographed pupil is converted into a gray scale gradient. After the gray gradient is obtained, the corresponding diopter is then checked out by diopter-gray gradient look-up table.
When measuring vision, the eyes need to stare at the lens barrel of the vision measuring equipment and keep the lens barrel for a certain time, so that an accurate result can be obtained.
The infant's attention holding time is short, the degree of fit is low, and during the measurement, infant's eyes probably can not stare at the camera lens, and measuring speed is slow, and there is the deviation in measuring result sometimes, and the performance of product remains to be improved.
In view of the above, it is necessary to provide a vision measuring device and a control method thereof that can attract the attention of infants and improve the measuring speed and the measuring effect.
Disclosure of Invention
The invention aims to provide a vision measuring device capable of attracting attention of infants to improve measuring speed and measuring effect and a control method thereof.
The technical scheme of the invention provides a vision measuring device which comprises a shell, an infrared light source module, a camera module, an environmental factor monitoring module, a control processing module and a display module;
The infrared light source module, the camera module, the environmental factor monitoring module and the control processing module are all arranged in the cavity of the shell, and the infrared light source module is positioned at the front side of the camera module;
The front end of the shell is provided with a front end unthreaded hole, and a dustproof lens is arranged in the front end unthreaded hole;
The infrared light source module is provided with a light transmission hole coaxially arranged with the front-end light hole, a plurality of first light sources and a plurality of second light sources which are arranged around the light transmission hole;
Wherein, also install the attention attracting module used for attracting attention in the said body.
In one optional technical scheme, when the vision measurement device is in a debugging state, a plurality of first light sources are simultaneously in a lighting state, and the camera module, the environmental factor monitoring module, the control processing module and the display module are all in working states;
When the vision measuring device is in a measuring state, the second light sources are sequentially in a lighting state according to a preset sequence of the light sources, wherein only one second light source is in the lighting state at a time, and the attention attracting module, the camera module, the control processing module and the display module are all in working states.
In one optional aspect, the attention attracting module includes a video attracting unit on a front side of the camera module;
The video suction unit is arranged on the outer side of the light hole in the radial direction of the light hole, and the video suction unit is parallel to the axis of the light hole;
The shell is also internally provided with a light splitting module which is used for reflecting the content of the video suction unit and emitting the content through the front-end light port, and the light splitting module comprises a light splitting sheet which can reflect visible light and can transmit infrared light;
the light splitting sheet is obliquely arranged on one side of the video suction unit facing the axis of the light transmitting hole, and the distance between the light splitting sheet and the video suction unit is gradually increased along the direction from back to front;
the optical path of the video suction unit is parallel to the axis of the light hole after being reflected by the light splitting sheet.
In one optional technical scheme, the attention attracting module further comprises a colored lamp attracting unit positioned at the front side of the infrared light source module;
The colored lamp attraction unit comprises a mounting bracket with a light through hole and a plurality of colored light sources which are arranged around the light through hole at intervals;
The light passing holes are coaxially arranged with the light transmitting holes, and light emitted by the first light source and the second light source can pass through the light passing holes.
In one optional aspect, the attention drawing module further includes a sound drawing unit.
In one optional technical scheme, the infrared light source module comprises 2n first light sources and 2n second light source groups which are staggered around the light transmission holes, wherein n is a natural number;
the second light source group comprises a plurality of second light sources which are arranged along the radial direction of the light transmission hole at intervals;
When the vision measuring device is in a debugging state, 2n first light sources are in a lighting state at the same time;
When the vision measuring device is in a measuring state, the 2n second light source groups are sequentially in a lighting state according to a preset sequence of the light source groups, wherein only one second light source in one second light source group is in the lighting state at a time.
In one of the alternative technical schemes, 2n second light source groups symmetrically form n second light source arrays with the center of the light transmission hole;
When the vision measuring device is in a measuring state, n second light source arrays are in a lighting state in sequence according to a preset sequence of the light source arrays;
when the second light source array is in a lighting state, the second light sources in the two second light source groups are alternately and sequentially lighted along the sequence from outside to inside.
In one optional aspect, the infrared light source module further includes a plurality of third light sources;
the third light source is positioned outside the first light source and the second light source along the radial direction of the light transmission hole;
and when any one of the second light sources is in a lighting state, the third light source is synchronously in the lighting state.
In one optional technical scheme, the environmental factor monitoring module comprises an infrared distance monitoring unit for monitoring the distance between the target to be measured and the front end of the shell, and an illuminance monitoring unit for monitoring the illuminance of environmental light.
The technical scheme of the invention also provides a control method of the vision measuring device, which comprises the following steps:
a debugging step, comprising:
A plurality of the first light sources are simultaneously lighted,
The environment factor monitoring module transmits the monitored distance data and illumination data to the control processing module, and the camera module transmits the image data to the control processing module;
the control processing module processes the distance data, the illuminance data and the image data, displays the processed distance data, the illuminance data and the image data through the display module, and gives out corresponding adjustment prompts;
A measurement step comprising:
the attention attracting module is turned on;
the second light sources are sequentially and singly lighted according to a preset sequence;
When each second light source is lightened, the camera module shoots and obtains a group of image data, and the image data is transmitted to the control processing module;
the control processing module processes the image data and displays the image data through the display module.
By adopting the technical scheme, the method has the following beneficial effects:
The vision measuring device and the control method thereof provided by the invention are provided with the attention attracting module for attracting the attention of infants. During measurement, the infant is attracted by the attention attracting module, eyes can look at the vision measuring device, vision measurement of the infant can be rapidly completed, accuracy of vision measurement results is improved, and performance of products is improved.
Drawings
FIG. 1 is a schematic view of an eyesight measurement device according to an embodiment of the present invention;
Fig. 2 is a sectional view of the housing along the front-rear direction;
FIG. 3 is a schematic view of the vision measuring device of FIG. 1 with the housing removed;
FIG. 4 is a front view of the structure of an infrared light source module;
FIG. 5 is a schematic view of the second light sources in the two second light source groups alternately and sequentially lighting in an order from outside to inside when the second light source array is in a lighting state;
fig. 6 is a front view of the festoon lamp suction unit;
FIG. 7 is a schematic diagram of signal connections of an infrared light source module, a camera module, an environmental factor monitoring module, an attention drawing module, a display module, and a control processing module;
FIG. 8 is a schematic diagram of a vision measurement using a vision measurement device;
FIG. 9 is a graph of sphere power versus gray scale gradient;
fig. 10 is an image after gray gradient fitting in the pupil center, wherein the horizontal coordinate is the number of pixels, the vertical coordinate is the gray value, and the slope of a straight line connecting multiple points is the gray gradient.
Detailed Description
Specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
As shown in fig. 1 to 4 and fig. 7, an eyesight measurement device according to an embodiment of the present invention includes a housing 1, an infrared light source module 2, a camera module 3, an environmental factor monitoring module 4, a control processing module 5 and a display module 6.
The infrared light source module 2, the camera module 3, the environmental factor monitoring module 4 and the control processing module 5 are all installed in the cavity 11 of the housing 1, and the infrared light source module 2 is located at the front side of the camera module 3.
The front end of the housing 1 has a front end aperture 12, and a dust-proof lens 9 is mounted in the front end aperture 12.
The infrared light source module 2 has a light-transmitting hole 22 arranged coaxially with the front-end light hole 12, and a plurality of first light sources 23 and a plurality of second light sources 24 arranged around the light-transmitting hole 22.
In which an attention attracting module 7 for attracting attention is also mounted in the housing 1.
The vision measuring device provided by the embodiment of the invention can also be called a vision detecting device. The vision measuring device provided by the embodiment of the invention is used for measuring or detecting the vision of human eyes, and can attract the attention of infants by arranging the attention attracting module 7, thereby being beneficial to improving the measuring or detecting speed and improving the measuring or detecting quality, and therefore, the vision measuring device can be also visualized as a vision measuring device special for the infants.
Specifically, the vision measuring device mainly comprises a shell 1, an infrared light source module 2, a camera module 3, an environmental factor monitoring module 4, a control processing module 5, a display module 6 and an attention attracting module 7.
The housing 1 has a cavity 11 therein. The infrared light source module 2, the camera module 3, the environmental factor monitoring module 4, the control processing module 5, and the attention drawing module 7 are respectively installed in the cavity 11 of the housing 1. The display module 6 may be mounted at the rear end of the cavity 11, and a window 13 is opened at the rear end of the housing 1 so that the display module 6 can be viewed by a user. The display module 6 is also mounted outside the cavity 11, directly on the outer surface of the housing 1.
The infrared light source module 2 is a mechanism for providing a light source, and is used for providing an infrared light source. The infrared light source module 2 is located on the front side of the lens 31 of the camera module 3. The infrared light source module 2 has a mounting plate 21, and a light hole 22 is provided in the middle of the mounting plate 21, and the light hole 22 is coaxially arranged with the front-end light hole 12. The infrared light source module 2 further includes a plurality of first light sources 23 and a plurality of second light sources 24 surrounding the light hole 22. The first light source 23 and the second light source 24 are both mounted on the front side of the mounting plate 21. The first light source 23 is illuminated during commissioning and the second light source 24 is illuminated in a sequence during measurement or detection. The first light source 23 and the second light source 24 are both infrared light sources, both for illuminating the pupil of the eye. The first light source 23 and the second light source 24 are respectively in signal connection with the control processing module 5. The control processing module 5 can control the on-off of the first light source 23 and the second light source 24 and acquire illumination data of the first light source 23 and the second light source 24.
The camera module 3 is a camera for photographing pupil imaging, and the camera module 3 stores and transmits the photographed pupil image to the control processing module 5 for subsequent processing.
The environmental factor monitoring module 4 is a mechanism for monitoring environmental parameters, which is installed at a designated position in the cavity 11. The environmental factor monitoring module 4 is configured to monitor a distance between an object to be detected (e.g., a face) and a front end of the housing 1, so that the control processing module 5 determines whether the distance is suitable. The environmental factor monitoring module 4 is further configured to monitor the illuminance of the environmental light, so that the control processing module 5 determines whether the illuminance of the environmental light meets the requirement. The environmental factor monitoring module 4 works during debugging, which is helpful for adjusting the vision measuring device to an optimal state and improving the detection precision.
The control processing module 5 has a function of controlling the operation of each module, and also has a function of processing data, images, and the like. The control processing module 5 may employ a controller, a chip, or the like.
The display module 6 is a display screen for displaying data, images, information, etc.
The attention attracting module 7 is a mechanism that attracts attention of an person (especially an infant) by producing video, audio, light, or the like.
The infrared light source module 2, the camera module 3, the environmental factor monitoring module 4, the display module 6 and the attention drawing module 7 are respectively connected with the control processing module 5 in a signal manner, for example, through a wire connection, so that data transmission is realized. The control processing module 5 can control the switch of each module.
The infrared light source module 2 transmits a brightness signal to the control processing module 5. The camera module 3 transmits the photographed image data to the control processing module 5. The environmental factor monitoring module 4 transmits the monitored distance signal and illuminance signal to the control processing module 5. The control processing module 5 can process the data, compare and judge the data to judge whether the environmental factors and the images meet the requirements, and generate corresponding prompt information to be displayed on the display module 6. The user can adjust the environmental parameters and the imaging parameters according to the prompt information so as to adjust the vision measuring device to the optimal state.
When vision measurement is performed, the attention attracting module 7 is started to attract the attention of the infant 100 to watch towards the vision measurement device, so that the vision measurement of the infant 100 can be rapidly completed, the accuracy of the vision measurement result is improved, and the performance of a product is improved.
As described above, the vision measuring device according to the present invention is provided with the attention attracting module 7 for attracting the attention of the infant 100. During measurement, the infant 100 is attracted by the attention attracting module 7, eyes can look at the vision measuring device, vision measurement of the infant 100 can be completed rapidly, accuracy of vision measurement results is improved, and performance of products is improved.
In one embodiment, as shown in connection with fig. 4, when the vision measuring device is in the debug state, the plurality of first light sources 23 are simultaneously in the lit state, and the camera module 3, the environmental factor monitoring module 4, the control processing module 5, and the display module 6 are all in the active state.
When the vision measuring device is in the measurement state, the plurality of second light sources 24 are sequentially in the lit state in accordance with the light source preset sequence, wherein only one second light source 24 is in the lit state at a time, and the attention attracting module 7, the camera module 3, the control processing module 5, and the display module 6 are all in the operation state.
Each of the second light sources 24 is an off-center light source. The illumination of the second light source 24 forms an infrared off-center light path system with the entire light path. The light emitted by the eccentric second light source 24 enters the human eye, and due to the refraction state of the human eye, the incident light forms a diffuse spot on the retina, the diffuse spot is diffusely reflected on the retina, and the light is input into the camera module 3 for imaging through the pupil. The pupil image taken by the camera module 3 varies according to the refractive condition of the eye being measured. When the refractive state of the human eye is normal, the gray scale in the pupil shot by the camera module 3 is uniform and has no light and shade difference, and when the refractive state of the human eye is abnormal (myopia or hyperopia), the gray scale in the pupil shot by the camera module 3 has obvious light and shade difference, and the size of the light and shade difference reflects the degree of myopia or hyperopia.
The second light sources 24 are sequentially and individually lighted according to a preset sequence, and different pupil images can be obtained according to the sequence so as to obtain a more accurate refractive state of human eyes.
Referring to fig. 8-10, in measuring vision in an infant 100 using the vision measuring device, the following manner of operation or control is provided:
Firstly, debugging a vision measuring device, and specifically, the method comprises the following steps of:
the infant 100 is at a distance L from the front end of the vision measuring device, suitably a distance l=1±0.05m.
All the first light sources 23 are illuminated simultaneously. The environmental factor monitoring module 4 monitors the distance from the face to the front end of the vision measuring device and the illuminance of the photographing environment. The camera module 3 photographs the pupil of the infant 100 and generates an image.
The distance data, illuminance data, and image data generated by the camera module 3, which are monitored by the environmental factor monitoring module 4, are transmitted to the control processing module 5.
The control processing module 5 performs comparison and judgment, generates prompt information or an image according to the comparison and judgment result, and finally displays the prompt information or the image through the display module 6 so as to be adjusted by a user according to the prompt information or the image.
The control processing module 5 is preset with a proper distance threshold value, an illuminance threshold value and an image data threshold value. The distance threshold, illuminance threshold, and image data threshold may be preset according to actual needs.
If the distance from the face to the front end of the vision measurement device is greater than the distance threshold, the vision measurement device is moved toward the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold, and if the distance from the face to the front end of the vision measurement device is less than the distance threshold, the vision measurement device is moved toward a direction away from the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold. The vision measuring device can be arranged on the bracket according to the requirement and can slide back and forth on the bracket so as to improve the stability when the vision measuring device is moved back and forth.
If the illuminance of the photographing environment is greater than the illuminance threshold, the exposure time is increased. When the ambient illuminance is relatively high, the pupil is contracted due to the physiological characteristics of human eyes, the light entering quantity of the human eyes is reduced, the photographed pupil image is dark, and the exposure time is required to be increased to ensure the brightness of the pupil image and obvious pupil gradient.
If the illuminance of the photographing environment is less than the illuminance threshold, the exposure time is reduced. When the ambient illuminance is smaller, the pupil is larger, the light inlet amount is increased, the gradient of the pupil is increased, and the exposure time is required to be reduced in order to avoid exceeding the preset normal gradient range.
If the image data is below the image data threshold, e.g., the pupil image is darker, then the adjustment is made by increasing the exposure time.
After the adjustment is completed, the vision measuring device is shown in an optimal state.
After the debugging is completed, vision measurement is carried out, and the specific operation is as follows:
The attention attracting module 7 is turned on to attract the attention of the infant 100 to look towards the vision measuring device. The second light sources 24 are individually lighted in turn in a preset order, and when each of the second light sources 24 is lighted, the camera module 3 photographs and obtains a set of image data, and transmits the image data to the control processing module 5. The control processing module 5 processes the image data and obtains a gray gradient of the pupil of the infant 100. The control processing module 5 is preset with a relation chart or a comparison table of sphere power and gray scale gradient shown in fig. 9. The map or look-up table of sphere power versus gray scale gradient can be made from a large number of experimental data previously.
The control processing module 5 detects the corresponding sphere power from the relation graph or the comparison table of the sphere power and the gray gradient according to the actual gray gradient. After obtaining the sphere power of the image data photographed by the camera module 3 when the second light source 24 of each angle is turned on, comprehensive refractive state data including sphere power, cylinder power and astigmatism axis can be calculated by the existing formula. And finally, the refraction state data are displayed through the display module 6.
The processing manner of the control processing module 5 for obtaining the gray gradient after the image data can refer to the content in the prior art, which is not the invention point in the present case, and the following is briefly described:
The detected human eye pupil ROI area removes the highlight point in the pupil, acquires the gray gradient of the pupil center area, and fits the gray gradient of the pupil center area with a least square method, as shown in fig. 10, to obtain the gray gradient.
Taking the spherical power in three directions as an example, r0, r60 and r120 are the spherical powers of the second light source 24 in the directions of 0 degrees, 60 degrees and 120 degrees, respectively.
When the second light source 24 at 0 degree is on, the camera module 3 shoots a corresponding image, and transmits the image data to the control processing module 5 for processing, the control processing module 5 obtains a corresponding gray gradient according to the above manner, and then the corresponding sphere degree r0 is found out from a relation diagram or a comparison table of the sphere degree and the gray gradient. R60, r120 are obtained in a similar manner.
And A, B, D parameters are calculated according to r0, r60 and r 120.
And calculating the comprehensive sphere power sph, cylinder power cyl and astigmatism axis according to the A, B, D three parameters.
The above calculation formula and calculation manner are a conventional calculation manner for obtaining the comprehensive refraction state, and the contents thereof will not be described in detail.
In one embodiment, as shown in fig. 1 and 3, the attention attracting module 7 includes a video attracting unit 71 on the front side of the camera module 3.
The video suction unit 71 is located outside the light-transmitting hole 22 in the radial direction of the light-transmitting hole 22, and the video suction unit 71 is parallel to the axis of the light-transmitting hole 22.
Also mounted in the housing 1 is a spectroscopic module 8 for reflecting the content of the video suction unit 71 and emitting it through the front-end light port 12, the spectroscopic module 8 including a spectroscopic sheet 81 capable of reflecting visible light and transmitting infrared light.
The light-splitting sheet 81 is disposed obliquely on the side of the video suction unit 71 facing the axis of the light-transmitting hole 22, and the distance between the light-splitting sheet 81 and the video suction unit 71 gradually increases in the direction from the rear to the front.
The optical path of the video suction unit 71 is reflected by the light-splitting sheet 81 and is parallel to the axis of the light-transmitting hole 22.
In the present embodiment, the attention attracting module 7 employs a video attracting unit 71 that is mounted on the front side of the lens 31 of the camera module 3. The video suction unit 71 is in signal connection with the control processing module 5. The control processing module 5 may control the switching of the video suction unit 71.
The video suction unit 71 is a video play screen. In order to avoid blocking the propagation of infrared rays, the video suction unit 71 is biased to the outside of the light-transmitting hole 22, and the video suction unit 71 is horizontally arranged to extend back and forth or to be parallel to the axis of the light-transmitting hole 22.
The spectroscopic module 8 is used to eject the video content of the video suction unit 71 from the front-end optical port 12. The light-splitting module 8 includes a light-splitting sheet 81, and the light-splitting sheet 81 is capable of reflecting visible light and transmitting infrared light. The light-splitting sheet 81 is obliquely arranged inside the video suction unit 71. The light-splitting sheet 81 can reflect the visible light emitted from the video suction unit 71 forward so that the visible light is emitted through the front-end light port 12. The light-splitting sheet 81 does not block the infrared rays propagating toward the lens 31. The infant 100 can see the video content on the light splitting sheet 81 and attract the infant 100 to watch the vision measuring device.
The video suction unit 71 and the spectroscopic module 8 may be arranged in a space between the infrared light source module 2 and the lens 31 as needed. The light splitting sheet 81 is obliquely positioned between the light transmitting hole 22 and the lens 31. The optical path of the video suction unit 71 is parallel to the axis of the light hole 22 or the front light hole 12 after being reflected by the light splitting sheet 81, and the video content thereof is emitted forward from the light hole 22 and the front light hole 12 after being reflected by the light splitting sheet 81.
The video suction unit 71 and the spectroscopic module 8 may also be arranged in the space between the infrared light source module 2 and the dust-proof lens 9, as required. The light sheet 81 is obliquely positioned between the front light aperture 12 and the light transmitting aperture 22. The optical path of the video suction unit 71 is parallel to the axis of the front-end light hole 12 or the light transmission hole 22 after being reflected by the light splitting sheet 81, and the video content thereof is emitted forward from the front-end light hole 12 after being reflected by the light splitting sheet 81.
In one embodiment, as shown in fig. 1, 3 and 6, the attention attracting module 7 further includes a colored light attracting unit 72 at the front side of the infrared light source module 2.
The color lamp suction unit 72 includes a mounting bracket 721 having a light passing hole 722 and a plurality of color light sources 723 spaced around the light passing hole 722.
The light passing holes 722 are arranged coaxially with the light transmitting holes 22, and light emitted from the first light source 23 and the second light source 24 can pass through the light passing holes 722.
In this embodiment, the attention attracting module 7 employs a color lamp attracting unit 72, and the color lamp attracting unit 72 is located on the front side of the infrared light source module 2. The color lamp attracting unit 72 is in signal connection with the control processing module 5. The control processing module 5 may control the on-off of the festoon lamp-attracting unit 72.
The color lamp attraction unit 72 includes a mounting bracket 721 and a plurality of colored light sources 723. The mounting bracket 721 has a light passing hole 722 disposed coaxially with the light passing hole 22. A plurality of colored light sources 723 are spaced around the light passing aperture 722. The color light source 723 is on the front side of the mounting bracket 721. The radius of the light passing hole 722 is larger than that of the light transmitting hole 22, and the light emitted from the first light source 23 and the second light source 24 can pass through the light passing hole 722.
As required, a notch portion 724 communicating with the light passing hole 722 is formed on the mounting bracket 721 to provide an avoidance space for the second light source units 26 shown in fig. 4, so that the light of each second light source 24 in the second light source units 26 can be propagated forward through the notch portion 724.
If necessary, a through hole 725 is provided at the edge of the mounting bracket 721, which is aligned with the third light source 25 shown in fig. 4, for light of the third light source 25 to travel forward.
The colored light source 723 may employ a monochromatic colored light source or a colored light source of a combined color, for example, one or a combination of several of yellow light source, red light source, violet light source, and the like.
At the time of measurement or detection, the colored light source 723 is illuminated, attracting the infant 100 to look at the vision measuring device.
In one embodiment, as shown in fig. 1 and 3, the attention attracting module 7 further includes a sound attracting unit 73.
In the present embodiment, the attention attracting module 7 employs a sound attracting unit 73, such as a speaker, a horn, or the like. The sound suction unit 73 is in signal connection with the control processing module 5. The control processing module 5 may control the switching of the sound-attracting unit 73.
At the time of measurement or detection, the sound suction unit 73 starts playing music, and sucks the infant 100 to look at the vision measuring device.
In one embodiment, as shown in fig. 4, the infrared light source module 2 includes 2n first light sources 23 and 2n second light source groups 26 that are staggered around the light transmission hole 22, where n is a natural number.
The second light source group 26 includes a plurality of second light sources 24 arranged at intervals along the radial direction of the light-transmitting holes 22.
When the vision measuring device is in the debug state, 2n first light sources 23 are simultaneously in the lit state.
When the vision measuring device is in the measurement state, the 2n second light source groups 26 are sequentially in the lighting state according to the preset sequence of the light source groups, wherein only one second light source 24 in one second light source group 26 is in the lighting state at a time.
In the present embodiment, the infrared light source module 2 includes an even number of first light sources 23 and an even number of second light source groups 26. Each second light source group 26 includes 3 or more second light sources 24 arranged in a row.
The even number of first light sources 23 and the even number of second light source groups 26 are respectively staggered around the light-transmitting holes 22. That is, there is one second light source group 26 between every two adjacent first light sources 23, and there is one first light source 23 between every two adjacent second light source groups 26. The plurality of second light sources 24 in each second light source group 26 are arranged at intervals along the radial direction of the light transmitting holes 22.
When the vision measuring device is in a measuring state, an even number of the second light source groups 26 are sequentially lighted according to a preset sequence of the light source groups, and only one second light source 24 in one second light source group 26 is lighted at a time. At each second light source 24, the camera module 3 captures and obtains a set of image data.
The second light sources 24 in each second light source group 26 are different in distance from the central axis, and when the second light sources 24 at different positions are lighted, the camera module 3 obtains image data slightly different. By photographing a plurality of groups of image data and finally averaging, the measurement accuracy can be improved.
In one embodiment, as shown in fig. 4-5, 2n second light source groups 26 are symmetrically formed into n second light source arrays 27 with respect to the center of the light transmission hole 22.
When the vision measuring device is in the measuring state, the n second light source arrays 27 are sequentially in the lighted state in accordance with the preset sequence of the light source arrays.
While the second light source array 27 is in the lit state, the second light sources 24 in the two second light source groups 26 are alternately sequentially lit in the order from the outside to the inside.
In the present embodiment, two second light source groups 26 symmetrically arranged with respect to the center of the light-transmitting hole 22 are formed into one second light source array 27. When the vision measuring device is in the measuring state, the second light source arrays 27 are sequentially lighted, and only one second light source 24 of one second light source group 26 on one side of one second light source array 27 is lighted at a time. When each of the second light source arrays 27 is lighted, the second light sources 24 in the two second light source groups 26 of the central symmetry are lighted alternately in sequence in the order from outside to inside. That is, the outermost second light source 24 in the first second light source group 26 is turned on first, then the outermost second light source 24 in the second light source group 26 is turned on, then the second light source 24 in the first second light source group 26 is turned on, then the second light source 24 in the second light source group 26 is turned on, and so on, so that the second light sources 24 are alternately turned on in a central symmetry manner as much as possible. The two sets of image data captured by the camera module 3 have extremely high similarity when each two symmetrical second light sources 24 are lit.
As shown in fig. 5, the second light source array 27 arranged horizontally illustrates that the second light sources 24 in the two second light source groups 26 are sequentially lighted in the order i, ii, iii, iv, v, vi.
In one embodiment, as shown in fig. 4, the infrared light source module 2 further includes a plurality of third light sources 25.
The third light source 25 is located outside the first light source 23 and the second light source 24 in the radial direction along the light transmission hole 22.
When any one of the second light sources 24 is in the lit state, the third light source 25 is synchronously in the lit state.
In this embodiment, the third light source 25 plays a role of compensation. The third light source 25 is farthest from the center of the light transmitting hole 22, and its light emitting angle and light emitting range are different from those of the second light source 24. The third light source 25 is connected with the control processing module 5 in a signal manner, and the control processing module 5 can control the on-off of the third light source 25 and acquire illumination data of the third light source 25.
When the second light source 24 is turned on, the image data photographed by the camera module 3 may be converted into corresponding parameter data, such as gray scale, by the control processing module 5.
When the third light source 25 is turned on, the image data photographed by the camera module 3 may be converted into corresponding compensation parameter data, such as compensation gray scale gradient, by the control processing module 5.
If a certain second light source 24 is turned on, the corresponding parameter data has a large fluctuation range, and exceeds the normal range, the compensation parameter data can be used for correction, so that the parameter data corresponding to the image data captured by the camera module 3 is within the normal range as much as possible when each second light source 24 is turned on.
In one embodiment, as shown in fig. 1 and 3, the environmental factor monitoring module 4 includes an infrared distance monitoring unit 41 for monitoring the distance between the object to be measured and the front end of the housing 1 and an illuminance monitoring unit 42 for monitoring the illuminance of the environmental light.
In the present embodiment, the environmental factor monitoring module 4 includes an infrared distance monitoring unit 41 and an illuminance monitoring unit 42. The infrared distance monitoring unit 41 and the illuminance monitoring unit 42 are respectively connected with the control processing module 5 in a signal manner. The control processing module 5 can control the switch of the infrared distance monitoring unit 41 and the illuminance monitoring unit 42 and acquire the data of the infrared distance monitoring unit 41 and the illuminance monitoring unit 42.
The infrared distance monitoring unit 41 may be an infrared distance sensor for monitoring the distance between the face and the vision measuring device. The illuminance monitoring unit 42 may be an illuminance monitoring sensor for monitoring illuminance of the shooting environment of the camera module 3.
By providing the infrared distance monitoring unit 41, the distance between the measured person and the device can be accurately controlled, and the adjustment of the distance is facilitated.
By providing the illuminance monitoring unit 42, shooting measurement is achieved by adjusting the exposure time high in an environment of higher brightness (170 lux).
The vision measuring device can complete the detection of the diopter of human eyes within 0.5s by shortening the exposure time.
Although the embodiment of the invention is mainly described by taking an infant as an embodiment, the vision measuring device provided by the invention can be used for refractive detection of adults.
Referring to fig. 1 to 10, a control method of a vision measuring device according to an embodiment of the present invention includes the following steps:
a debugging step, comprising:
The plurality of first light sources 23 are simultaneously lighted,
The environmental factor monitoring module 4 transmits the monitored distance data and illumination data to the control processing module 5, and the camera module 3 transmits the image data to the control processing module 5.
The control processing module 5 processes the distance data, the illuminance data and the image data, and then displays the processed distance data, illuminance data and image data through the display module 6, and gives corresponding adjustment prompts.
A measurement step comprising:
The attention drawing module 7 is turned on.
The second light sources 24 are individually lighted in sequence in a preset sequence.
When each of the second light sources 24 is turned on, the camera module 3 photographs and obtains a set of image data, and transmits the image data to the control processing module 5.
The control processing module 5 processes the image data and displays it through the display module 6.
When the vision measuring device is used for measuring the vision of the infant 100, the following operation mode or control mode is adopted:
Firstly, debugging a vision measuring device, and specifically, the method comprises the following steps of:
the infant 100 is at a distance L from the front end of the vision measuring device, suitably a distance l=1±0.05m.
All the first light sources 23 are illuminated simultaneously. The environmental factor monitoring module 4 monitors the distance from the face to the front end of the vision measuring device and the illuminance of the photographing environment. The camera module 3 photographs the pupil of the infant 100 and generates an image.
The distance data and illuminance data monitored by the environmental factor monitoring module 4 and the image data generated by the camera module 3 are transmitted to the control processing module 5.
The control processing module 5 performs comparison and judgment, generates prompt information or an image according to the comparison and judgment result, and finally displays the prompt information or the image through the display module 6 so as to be adjusted by a user according to the prompt information or the image.
The control processing module 5 is preset with a proper distance threshold value, an illuminance threshold value and an image data threshold value. The distance threshold, illuminance threshold, and image data threshold may be preset according to actual needs.
If the distance from the face to the front end of the vision measurement device is greater than the distance threshold, the vision measurement device is moved toward the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold, and if the distance from the face to the front end of the vision measurement device is less than the distance threshold, the vision measurement device is moved toward a direction away from the infant 100 until the distance from the face to the front end of the vision measurement device is within the distance threshold. The vision measuring device can be arranged on the bracket according to the requirement and can slide back and forth on the bracket so as to improve the stability when the vision measuring device is moved back and forth.
If the illuminance of the photographing environment is greater than the illuminance threshold, the exposure time is increased. When the ambient illuminance is relatively high, the pupil is contracted due to the physiological characteristics of human eyes, the light entering quantity of the human eyes is reduced, the photographed pupil image is dark, and the exposure time is required to be increased to ensure the brightness of the pupil image and obvious pupil gradient.
If the illuminance of the photographing environment is less than the illuminance threshold, the exposure time is reduced. When the ambient illuminance is smaller, the pupil is larger, the light inlet amount is increased, the gradient of the pupil is increased, and the exposure time is required to be reduced in order to avoid exceeding the preset normal gradient range.
If the image data is below the image data threshold, e.g., the pupil image is darker, then the adjustment is made by increasing the exposure time.
After the adjustment is completed, the vision measuring device is shown in an optimal state.
After the debugging is completed, vision measurement is carried out, and the specific operation is as follows:
The attention attracting module 7 is turned on to attract the attention of the infant 100 to look towards the vision measuring device. The second light sources 24 are individually lighted in turn in a preset order, and when each of the second light sources 24 is lighted, the camera module 3 photographs and obtains a set of image data, and transmits the image data to the control processing module 5. The control processing module 5 processes the image data and obtains a gray gradient of the pupil of the infant 100. The control processing module 5 is preset with a relation chart or a comparison table of sphere power and gray scale gradient shown in fig. 9. The map or look-up table of sphere power versus gray scale gradient can be made from a large number of experimental data previously.
The control processing module 5 detects the corresponding sphere power from the relation graph or the comparison table of the sphere power and the gray gradient according to the actual gray gradient. After obtaining the sphere power of the image data photographed by the camera module 3 when the second light source 24 of each angle is turned on, comprehensive refraction state data including sphere power, cylinder power and astigmatism axis position are calculated through a formula. And finally, the refraction state data are displayed through the display module 6.
In summary, the vision measuring device and the control method thereof provided by the invention are provided with the attention attracting module to attract the attention of infants. During measurement, the infant is attracted by the attention attracting module, eyes can look at the vision measuring device, vision measurement of the infant can be rapidly completed, accuracy of vision measurement results is improved, and performance of products is improved.
The above technical schemes can be combined according to the need to achieve the best technical effect.
What has been described above is merely illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.
Claims (8)
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| CN115281601B (en) * | 2022-08-18 | 2025-01-28 | 上海市内分泌代谢病研究所 | A device for measuring the width of palpebral fissure and a method for using the same |
| CN116982926A (en) * | 2023-06-14 | 2023-11-03 | 沈阳爱络博智能科技有限公司 | A vision screening device and a cylinder structure of a vision screening camera |
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