CN115281601A - Eye crack width measuring device and using method thereof - Google Patents
Eye crack width measuring device and using method thereof Download PDFInfo
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Abstract
The present invention provides an eye crack width measuring device, comprising: a measuring unit configured to receive and position a head of a subject; a control unit configured to control an operating state of the measuring unit; the measuring unit comprises a measuring cavity, a shooting module and a guiding lamp module are arranged in the measuring cavity, and the guiding lamp module guides a measured person to watch a preset direction; the method comprises the steps of before a shooting module acquires data to be processed, calibrating parameters, wherein the parameter calibrating steps are used for acquiring the mapping relation between a single pixel corresponding to the data to be processed and the actual size of a calibrated object; the control unit controls the shooting module to shoot the face of the measured person to obtain data to be processed; the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement. The device has improved the measurement convenience and the measurement accuracy of eye fissure width.
Description
Technical Field
The invention relates to the technical field of measuring instruments, in particular to an eye fissure width measuring device and a using method thereof.
Background
The width of the eye fissure is one of the common eye parameter measurement indexes, and the parameter has important significance for medical treatment or scientific research. In consideration of cost and convenience of operation, the eye fissure width data of the measured person is often obtained by manual measurement. The specific scheme is that a measurer places a ruler in front of eyeballs of a patient, reads the distance from the center of a pupil to the edge of an upper eyelid, and uses the distance as a quantitative index of the width of a fissure. In practice, it has been found that the above-mentioned measurement method results in lack of stability of the measurement result due to differences in operation habits or use experiences among individual operators. For example, it is difficult for the operator to locate the center of the through hole, or to keep the placement angle of the straightedge equal for each measurement, or to keep the viewing angle equal for each reading; the above-mentioned various operation habits all cause the measurement result to have differences, and the repeatability of the measurement result is poor, so that the change process of the eye fissure width data of the measured person cannot be accurately tracked for a long time.
Disclosure of Invention
In order to overcome at least one of the problems of the related art devices, the invention provides an eye crack width measuring device and a using method thereof.
To achieve the above object, according to an aspect of an embodiment of the present invention, there is provided an eye tear width measuring apparatus including:
a measuring unit configured to receive and position a head of a subject;
a control unit configured to control an operating state of the measuring unit;
the measuring unit comprises a measuring cavity, a shooting module and a guide lamp module are arranged in the measuring unit, wherein
The guiding lamp module guides a measured person to watch a preset direction;
the method comprises the steps of obtaining a mapping relation between a single pixel corresponding to data to be processed and the actual size of a calibration object by a shooting module before the data to be processed is obtained by the shooting module;
the control unit controls the shooting module to shoot the face of the measured person to obtain data to be processed;
the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
Optionally, a forehead support module and/or a jaw support module are/is arranged in the measuring cavity,
based on the head position information acquired by the shooting module, the control unit controls the forehead support module to move so as to adjust the front and back positions of the head; and/or the control unit controls the jaw support module to move so as to adjust the upper and lower positions of the head.
Optionally, before the controlling unit divides the data to be processed, the method further includes:
and analyzing the data to be processed, positioning the eye region, and taking the data corresponding to the positioned eye region as the data to be processed.
Optionally, if the noise of the data corresponding to the located eye region exceeds a set threshold, gaussian filtering is performed on the data to be processed, and the filtered data is used as the data to be processed.
Optionally, the dividing the data to be processed by the control unit to obtain the pupil center coordinates and the upper eyelid contour coordinates includes:
dividing the data to be processed to separate the eye area, the pupil and the background, performing circular fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; and
and carrying out edge detection on the eye region and obtaining the upper eyelid contour coordinates through gradient transformation of the image.
Optionally, the comparing the pupil center coordinate with the upper eyelid contour coordinate to obtain the fissure width measurement value includes:
and calculating a vertical coordinate XB corresponding to a point B equal to the horizontal coordinate XA in the upper eyelid contour coordinate by taking the horizontal coordinate XA of the pupil center A as a reference, and calculating the width D of the eye fissure according to the following formula:
D＝|(Y A -Y B )*K|
wherein Y is A And Y B Respectively is the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
Optionally, the data of the width of the eye fissure is stored, and the variation trend of the data of the width of the eye fissure of the measured person is tracked.
According to another aspect of the embodiments of the present invention, there is provided a method for using an eye crack width measuring device, the measuring device comprising:
a measuring unit configured to receive and position a head of a subject to be measured;
a control unit configured to control an operating state of the measuring unit;
the method comprises the following steps:
calibrating parameters of a shooting module, wherein the parameter calibration is used for acquiring a mapping relation between a single pixel corresponding to data to be processed and the actual size of a calibration object;
adjusting the head position of the person to be measured partially placed in the measuring cavity so that the face of the person to be measured is opposite to the shooting module;
after guiding the tested person to look at the lighted guiding lamp module, the control unit controls the shooting module to shoot the face of the tested person to obtain data to be processed;
the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
Optionally, before the controlling unit divides the data to be processed, the method further includes: analyzing the data to be processed, positioning an eye region, and taking the data corresponding to the positioned eye region as the data to be processed; and if the noise of the data corresponding to the positioned eye region exceeds a set threshold, performing Gaussian filtering on the data to be processed, and taking the filtered data as the data to be processed.
Optionally, the control unit segments the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement comprising:
dividing the data to be processed to separate the eye area, the pupil and the background, performing circular fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; carrying out edge detection on the eye region and obtaining upper eyelid contour coordinates through gradient transformation of the image;
abscissa X of pupil center A A For reference, the coordinate of the upper eyelid contour is compared with the abscissa X A The ordinate X corresponding to equal points B B And calculating the width of the eye fissure D according to the following formula:
D＝|(Y A -Y B )*K|
wherein Y is A And Y B Respectively as the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
The technical scheme of the invention at least has the following advantages or beneficial effects:
(1) A portion of the subject's head is located within the cavity of the device, which substantially closes the open end of the cavity, thereby reducing or eliminating the ingress of ambient light into the measurement cavity; the influence of ambient light on the attention of a measurer is effectively avoided, and the measurement precision and efficiency are improved. Only be provided with the pilot lamp module in the device, avoid influencing measurand person's gaze direction because of the light of extra light filling lamp to the light intensity of light filling lamp can cause the uncomfortable scheduling problem of measurand person's eye, has improved measurand person's measurement experience. The measuring device or the method can accurately position the head posture of the measured person, acquire the facial data of the measured person through the shooting module, and automatically recognize the data to obtain the parameters of the width of the eye fissure, thereby improving the accuracy of data measurement and improving the measuring efficiency.
(2) The eye region in the face image of the measured person is positioned by positioning the eye region of the acquired data, and the eye region is used as the analysis basis of the subsequent process, so that the data processing amount and the processing time can be effectively reduced, and the measurement and analysis speed of the eye crack width is improved.
(3) And performing Gaussian filtering on the positioned eye region data, removing image noise, improving the accuracy of the data and further improving the measurement precision.
(4) The measuring device can adjust the forehead and jaw positions of a measured person, so that the measured person keeps a correct head posture, a clear eye position picture is obtained, and the measuring accuracy is improved. The measuring device can store the data of the measured person and correlate the data with the identification code of the measured person, thereby being convenient for observing the change process of the eye crack width data of the measured person.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
fig. 1 is a schematic view of a main structure of a crack width measuring device according to an embodiment of the invention;
FIG. 2 is a schematic view of the operating state of a crack width measuring device according to an embodiment of the invention;
fig. 3 is a schematic diagram of a workflow of an eye crack width measuring device according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a crack width acquisition principle according to an embodiment of the invention;
fig. 5-6 are schematic diagrams of a prior art eye crack width measuring device.
Detailed Description
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which various details of embodiments of the invention are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
To address at least one of the problems in the background, an eye crack width measuring device is provided according to an aspect of an embodiment of the present invention.
For the convenience of understanding, the measurement device and the measurement principle thereof in the related art will be described first. As shown in fig. 5 to 6, the width of the eye fissure in the related art is measured with a ruler. Specifically, the measurer relaxes the measured person, watches far away with a first eye position (namely, the front of the measured person is looked at), keeps a normal head position, holds the ruler along the plumb direction, enables the edge of the ruler with scales to be close to the center of the pupil, and reads the distance from the center of the pupil to the edge of the upper eyelid through visual observation to obtain the eye fissure width data. Typically, the width of a human eye's eye cleft is in the range of 3.5-5.5mm. The existing measuring method depends on the proficiency of hands of a measurer and the accuracy of reading, the operation of the measuring process is complex, the height of the measurer needs to be matched with the operation indication of the measurer, and the measurement error of the width of the eye crack is large due to the large error of visual measurement reading. In addition, different measurers have different measurement habits, which results in large data deviation, and when a measured person changes a measurement place or changes a measurer, the measured data of the eye crack width fluctuates greatly, so that the repeatability of the data is poor, and the change process of the eye crack width cannot be accurately tracked for a long time. Moreover, the measurement results cannot be stored for a long time, and part or all of the data is easily lost.
To this end, one embodiment of the present invention provides a new measuring device, as shown in particular in fig. 1 and 2. It comprises a measuring unit configured to receive and position the head of a person to be measured. Because human eyes are sensitive to light, the change of light outside the measuring device can affect the gazing direction of a measured person, thereby affecting the measuring result. For this purpose, the measuring unit in this embodiment has a cavity structure which serves not only for mounting the measuring element but also for receiving and positioning the head of the measured person. That is, the head portion of the subject is located within the cavity, which substantially closes the open end of the cavity, thereby reducing or eliminating the ingress of ambient light into the measurement cavity; the influence of ambient light on the attention of a measurer is effectively avoided, and the measurement precision and efficiency are improved. Further, the measuring device comprises a control unit 107 configured to control the operating state of said measuring unit. In practice, the control unit and the measuring unit can be designed integrally to improve the integration level; the two may be provided separately. When the split type design is adopted, the head posture of a measured person can be conveniently observed and the working state of the equipment can be controlled while an operator operates the control unit. Illustratively, the control unit may include a display, a keyboard, a host, and the like. The measuring unit comprises a measuring cavity 104, and a shooting module 103 and a guide lamp module 105 are arranged in the measuring cavity. The measuring cavity 104 is arranged on the fixed base 106, and the shooting module is arranged right opposite to the face of a measured person. The guiding lamp module is positioned below the shooting module. In practice, in order to reduce the problem that the shooting module generates too many noise points of the shot picture due to insufficient light, a light supplement lamp can be arranged in the measuring cavity. However, the light of the light supplement lamp affects the gazing direction of the measured person, and the light intensity of the light supplement lamp causes discomfort to the eyes of the measured person. Therefore, in the preferred embodiment, the light supplement lamp is not arranged, and the noise of the shot picture is removed through the image processing means. The guide lamp module guides a measured person to watch a preset direction. Aiming at the requirement of measuring the width of the eye fissure, the guide lamp module in one embodiment of the invention can respectively provide illumination for the left eye or the right eye, and after the guide lamp module is turned on, a measured person can adjust eyeballs according to instructions to watch the light-emitting points of the guide lamp module, so that the forward-looking shooting posture of the eyeballs is formed. When the device is used, the control system can send out voice prompts and light the guide lamp module, and the voice prompts guide a measured person to see the guide lamp. Further, the shooting module comprises a parameter calibration step before acquiring the data to be processed, wherein the parameter calibration step is used for acquiring the mapping relation between the single pixel corresponding to the data to be processed and the actual size of the calibration object. In practice, the sizes of the actual objects represented by the single pixels are different due to different parameter performances of different shooting modules, or the sizes of the objects reflected by the shooting pictures are different when the positions of the shooting modules relative to human eyes are different. Because the numerical value of the width of the eye fissure of the human eye is small, errors generated in the shooting process amplify errors of the measurement result. It is important to eliminate the error in the shooting process. Therefore, before the picture is shot, it is important to calibrate the shooting module to obtain the actual size represented by each pixel in the picture shot at the current shooting angle. In one embodiment of the invention, the aim of calibration is fulfilled by adopting a geometric similarity method. The method includes the steps that the plane of a measured object is perpendicular to the optical axis of a shooting module, and the measured object is parallel to the imaging plane of the shooting module. Preferably, the object to be measured is a calibration plate with a known size. After the calibration board is placed, the shooting module is used for collecting the picture of the calibration board, the pixel number N and the actual size D of the calibration board can be further obtained, and finally the proportionality coefficient K between the pixel number N and the actual size D is converted out, wherein the proportionality coefficient K is also called as a calibration coefficient. The calculation formula is as follows:
in practical use, in order to facilitate the calibration of parameters by an operator, the calibration plate can be integrated in the measurement cavity and avoid the face of the measured person.
After the calibration is completed, the shooting module can be controlled by the control unit to shoot the face of the measured person to obtain the data to be processed. For example, the data to be processed may be image data acquired by a shooting module. Further, the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
Optionally, a forehead support module 101 and/or a jaw support module 102 are further disposed in the measurement cavity, and based on the head position information obtained by the shooting module, the control unit controls the forehead support module to move so as to adjust the front and back positions of the head; and/or the control unit controls the jaw support module to move so as to adjust the upper and lower positions of the head. In one embodiment, after the head of the measured person is placed in the measuring cavity, the measured head posture can be adjusted by the measuring person to obtain the required shooting angle. And gather in real time by shooting the module and surveyed person's facial picture to transmit the picture to surveyor's display device, surveyor can accurately grasp surveyor's head gesture, when the gesture can not satisfy and shoot the demand, it can send the instruction with the interior forehead support module of adjustment measurement cavity and/or jaw support module to the control unit. In one embodiment, the forehead support is connected with the horizontal moving platform, and the control unit is electrically connected with the horizontal moving platform to adjust the front and back positions of the forehead support; the jaw support is connected with the vertical moving platform, and the control unit is electrically connected with the vertical moving platform to adjust the upper position and the lower position of the jaw support. The head position of a tested person can be controlled by respectively arranging the independent mobile platform for the jaw support and the forehead support, and the mobile platform is electrically connected with the control unit so as to move in real time under the instruction control of the control unit.
Optionally, before the controlling unit divides the data to be processed, the method further includes: and analyzing the data to be processed, positioning the eye region, and taking the data corresponding to the positioned eye region as the data to be processed. The shooting module is generally used for collecting the face of the measured person, so that only the eyes of the measured person cannot be shot, or when the left eye and the right eye of the measured person need to be measured simultaneously, the shooting module is used for shooting the face of the measured person, so that the data collection amount can be remarkably reduced, and the collection efficiency is improved. But the face data causes an increase in the amount of subsequent data processing and a decrease in measurement efficiency. Therefore, in one embodiment, the eye region of the acquired data is positioned, the eye region in the face image of the measured person is positioned, and the eye region is used as the analysis basis of the subsequent process, so that the data processing amount and the processing time can be effectively reduced, and the measurement and analysis speed of the width of the eye fissure can be improved. In one embodiment, facial features (e.g., eyes, nose, etc.) are identified using facial image recognition methods.
Optionally, if the noise of the data corresponding to the located eye region exceeds a set threshold, gaussian filtering is performed on the data to be processed, and the filtered data is used as the data to be processed. As described above, when the fill-in light is not provided, it can be found that the located eye region generates gaussian noise due to insufficient brightness of the shooting field of view or insufficient uniformity of brightness during the image acquisition process. Therefore, in order to improve the accuracy of the data and improve the measurement accuracy, in an embodiment of the present invention, gaussian filtering is performed on the located eye region data to remove image noise.
Optionally, the dividing, by the control unit, the data to be processed to obtain the pupil center coordinate and the upper eyelid contour coordinate includes: dividing the data to be processed to separate the eye area, the pupil and the background, performing circle fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; and carrying out edge detection on the eye region and obtaining the upper eyelid contour coordinates through gradient transformation of the image. In order to accurately obtain the pupil center coordinates and the eyelid contour coordinates from the data acquired by the shooting module, in one embodiment of the invention, the image of the gaussian-filtered eye region is segmented, the eye region, the pupil and the background are separated to be displayed in the image, other backgrounds are covered with white, and the contour of the whole eye region and the contour of the pupil are extracted. Furthermore, hough circle transformation is carried out on the segmented image, pupils in the image are fitted into a circle, and the coordinates of the circle center are identified, wherein the coordinates of the circle center are the coordinates of the centers of the pupils. Further, in order to obtain the contours of the eyelids, in one embodiment, edge detection is performed again on the divided image, the contours of the eyelids on the human eye are extracted by gradient transformation of the image, and coordinate point information contained in the contours is saved in a register.
Optionally, the comparing the pupil center coordinate with the upper eyelid contour coordinate to obtain the fissure width measurement value includes: abscissa X of pupil center A A For reference, the X abscissa is obtained from the coordinates of the upper eyelid profile A The ordinate X corresponding to equal points B B And calculating the width of the eye cleft D according to the following formula:
D＝|(Y A -Y B )*K|
wherein Y is A And Y B Respectively is the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
As shown in fig. 4, the circular contour curve 402 of the pupil and the coordinates of the center of the circle (i.e. the coordinates of the center of the pupil) can be obtained through the processing steps described above; further, a contour curve 401 of the eyelid may be obtained. In practice, the width of the fissure is defined as the distance from the center of the pupil A to the corresponding point B on the eyelid, the abscissa of said point B being equal to the abscissa of point A. Therefore, when calculating the eye crack width D, only the difference in the vertical coordinate between the points a and B needs to be calculated.
Optionally, the eye crack width data is stored, and the change trend of the eye crack width data of the measured person is tracked. In practice, a measured person often goes to different cities or different institutions in the same city to collect the eye crack width data, so that the data loss is avoided or the burden of the measured person on storing the data is reduced. The data is associated with the identification code of the measured person, so that the measured person can inquire out the historical measurement data of the measured person only by providing the identification code. The identification code can be an identity card number, a social security number or a mobile phone number of the measured person. Therefore, a clamping groove is formed in a base of the measuring device; and/or various types of communication interfaces. The card slot includes but is not limited to be used for inserting a social security card, an identity card and the like. The card slot is electrically connected with the card reading module in the base. Accordingly, communication interfaces include, but are not limited to, network access ports, USB interfaces, and the like. It will be appreciated that other types of I/O interfaces may be integrated on the device chassis, which may be used to interface with input devices including a keyboard, mouse, etc.; an output section including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section including a hard disk and the like; and a communication section including a network interface card such as a LAN card, a modem, or the like. The communication section performs communication processing via a network such as the internet. The drive is also connected to the I/O interface as needed. A removable medium such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive as necessary, so that a computer program read out therefrom is mounted into the storage section as necessary.
A second aspect of an embodiment of the present invention provides a method for using an eye crack width measuring device. It should be noted that the same structures or components mentioned in this embodiment have the same meaning and function as in the first aspect, and detailed analysis is not performed here. Further, the measuring device in the method comprises: a measuring unit configured to receive and position a head of a subject to be measured; and the control unit is configured to control the working state of the measuring unit. The method comprises the following steps: the method comprises the steps of shooting module parameter calibration, wherein the parameter calibration is used for obtaining the mapping relation between a single pixel corresponding to data to be processed and the actual size of a calibration object; adjusting the head position of the person to be measured partially placed in the measuring cavity so that the face of the person to be measured is opposite to the shooting module; after guiding the tested person to look at the lighted guiding lamp module, the control unit controls the shooting module to shoot the face of the tested person to obtain data to be processed; the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
Optionally, in the method, before the controlling unit segments the data to be processed, the method further includes: analyzing the data to be processed, positioning an eye region, and taking the data corresponding to the positioned eye region as the data to be processed; and if the noise of the data corresponding to the positioned eye region exceeds a set threshold, performing Gaussian filtering on the data to be processed, and taking the filtered data as the data to be processed.
Optionally, in the method, the control unit segments the data to be processed to obtain a pupil center coordinate and an upper eyelid contour coordinate; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement comprising:
dividing the data to be processed to separate the eye area, the pupil and the background, performing circle fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; carrying out edge detection on the eye region and obtaining upper eyelid contour coordinates through gradient transformation of the image;
and calculating a vertical coordinate XB corresponding to a point B equal to the horizontal coordinate XA in the upper eyelid contour coordinate by taking the horizontal coordinate XA of the pupil center A as a reference, and calculating the width D of the eye fissure according to the following formula:
D＝|(Y A -Y B )*K|
wherein YA and YB are respectively the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
The above-described embodiments should not be construed as limiting the scope of the invention. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An eye tear width measurement device comprising:
a measuring unit configured to receive and position a head of a subject;
a control unit configured to control an operating state of the measuring unit;
the method is characterized in that:
the measuring unit comprises a measuring cavity, a shooting module and a guide lamp module are arranged in the measuring unit, wherein
The guiding lamp module guides a measured person to watch a preset direction;
the method comprises the steps of obtaining a mapping relation between a single pixel corresponding to data to be processed and the actual size of a calibration object by a shooting module before the data to be processed is obtained by the shooting module;
the control unit controls the shooting module to shoot the face of the measured person to obtain data to be processed;
the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
2. The apparatus according to claim 1,
a forehead support module and/or a jaw support module are/is arranged in the measuring cavity,
based on the head position information acquired by the shooting module, the control unit controls the forehead support module to move so as to adjust the front and back positions of the head; and/or the control unit controls the jaw support module to move so as to adjust the upper and lower positions of the head.
3. The apparatus as claimed in claim 1, wherein the control unit further comprises, before dividing the data to be processed:
and analyzing the data to be processed, positioning the eye region, and taking the data corresponding to the positioned eye region as the data to be processed.
4. The apparatus of claim 3,
and if the noise of the data corresponding to the positioned eye region exceeds a set threshold, performing Gaussian filtering on the data to be processed, and taking the filtered data as the data to be processed.
5. The apparatus as claimed in claim 1, wherein the control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates comprises:
dividing the data to be processed to separate the eye area, the pupil and the background, performing circle fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; and
and carrying out edge detection on the eye region and obtaining the upper eyelid contour coordinates through gradient transformation of the image.
6. The apparatus of claim 1, wherein the comparing the pupil center coordinates and the upper eyelid profile coordinates to obtain the tear width measurement comprises:
abscissa X of pupil center A A For reference, the X abscissa is obtained from the coordinates of the upper eyelid profile A The ordinate X corresponding to equal points B B And calculating the width of the eye fissure D according to the following formula:
D＝|(Y A -Y B )*K|
wherein Y is A And Y B Respectively is the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
7. The apparatus according to claim 6,
and storing the eye crack width data and tracking the change trend of the eye crack width data of the measured person.
8. A method of using an eye tear width measurement device, the measurement device comprising:
a measuring unit configured to receive and position a head of a subject to be measured;
a control unit configured to control an operating state of the measuring unit;
the method is characterized in that: the method comprises the following steps:
calibrating parameters of a shooting module, wherein the parameter calibration is used for acquiring a mapping relation between a single pixel corresponding to data to be processed and the actual size of a calibration object;
adjusting the head position of the person to be measured partially placed in the measuring cavity so that the face of the person to be measured is opposite to the shooting module;
after guiding the tested person to look at the lighted guiding lamp module, the control unit controls the shooting module to shoot the face of the tested person to obtain data to be processed;
the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement.
9. Use according to claim 8,
before the control unit divides the data to be processed, the method further comprises the following steps: analyzing the data to be processed and positioning the eye region, and then taking the data corresponding to the positioned eye region as the data to be processed; and if the noise of the data corresponding to the positioned eye region exceeds a set threshold, performing Gaussian filtering on the data to be processed, and taking the filtered data as the data to be processed.
10. Use according to claim 9,
the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain a fissure width measurement comprising:
dividing the data to be processed to separate the eye area, the pupil and the background, performing circle fitting on the pupil outline, and taking the circle center coordinate corresponding to the circle as the pupil center coordinate; carrying out edge detection on the eye region and obtaining upper eyelid contour coordinates through gradient transformation of the image;
abscissa X of pupil center A A For reference, the X abscissa is obtained from the coordinates of the upper eyelid profile A The ordinate X corresponding to equal points B B And calculating the width of the eye cleft D according to the following formula:
D＝|(Y A -Y B )*K|
wherein, Y A And Y B Respectively is the ordinate of the pupil center and the ordinate of the point B; k is the mapping relation.
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