A device for measuring the width of palpebral fissure and a method for using the same

Abstract

The present invention provides a device for measuring the width of palpebral fissure, comprising: a measuring unit configured to accommodate and position the head of a person to be measured; a control unit configured to control the working state of the measuring unit; the measuring unit comprises a measuring cavity, a shooting module and a guide light module are arranged inside the measuring unit, wherein the guide light module guides the person to be measured to look at a preset direction; the shooting module comprises a parameter calibration step before acquiring the data to be processed, and the parameter calibration step is used to acquire the mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object; the control unit controls the shooting module to shoot the face of the person to be measured to obtain the data to be processed; the control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value. The device improves the convenience and accuracy of measuring the palpebral fissure width.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, and in particular to a palpebral fissure width measuring device and a use method thereof. Background Art

[0002] Palpebral fissure width is one of the common eye parameter measurement indicators, and this parameter is of great significance to both medical treatment and scientific research. For cost and ease of operation, manual measurement is currently often used to obtain the palpebral fissure width data of the subject. The specific scheme is as follows: the measurer places a ruler in front of the patient's eyeball, reads the distance from the center of the pupil to the edge of the upper eyelid, and uses the distance as a quantitative indicator of palpebral fissure width. In practice, it is found that the above-mentioned measurement method will lead to a lack of stability in the measurement results due to differences in operating habits or usage experience between individual operators. For example, it is difficult for the operator to locate the center of the through hole, or it is difficult to keep the placement angle of the ruler equal during each measurement, or it is difficult to keep the sight angle equal during each reading; the above-mentioned various operating habits will lead to differences in the measurement results, and the repeatability of the measurement results is poor, and thus it is impossible to accurately track the change process of the palpebral fissure width data of the subject for a long time. Summary of the invention

[0003] In order to overcome at least one of the problems existing in the devices in the related art, the present invention provides a palpebral fissure width measuring device and a method for using the same.

[0004] To achieve the above object, according to one aspect of an embodiment of the present invention, a device for measuring palpebral fissure width is provided, comprising:

[0005] a measuring unit configured to receive and position a head of a person being measured;

[0006] A control unit configured to control the working state of the measuring unit;

[0007] The measuring unit comprises a measuring cavity, inside which a shooting module and a guide light module are arranged.

[0008] The guide light module guides the person being measured to look at a preset direction;

[0009] The shooting module includes a parameter calibration step before acquiring the data to be processed, wherein the parameter calibration step is used to obtain a mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object;

[0010] The control unit controls the shooting module to shoot the face of the person being measured to obtain data to be processed;

[0011] The control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value.

[0012] Optionally, a forehead support module and / or a jaw support module are further provided in the measuring cavity.

[0013] Based on the head position information obtained by the camera module, the control unit controls the movement of the forehead support module to adjust the front and back position of the head; and / or, the control unit controls the movement of the jaw support module to adjust the up and down position of the head.

[0014] Optionally, before the control unit divides the data to be processed, the control unit further includes:

[0015] The data to be processed is analyzed and the eye region is located, and then the data corresponding to the located eye region is used as the data to be processed.

[0016] Optionally, if the noise of the data corresponding to the located eye area 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.

[0017] Optionally, the control unit segments the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates, including:

[0018] Segmenting the data to be processed to separate the eye region, the pupil and the background, performing circular fitting on the pupil contour, and using the center coordinates of the circle corresponding to the circle as the center coordinates of the pupil; and

[0019] The edge detection of the eye area is performed and the coordinates of the upper eyelid contour are obtained by gradient transformation of the image.

[0020] Optionally, the step of comparing pupil center coordinates and upper eyelid contour coordinates to obtain a palpebral fissure width measurement value includes:

[0021] Taking the abscissa XA of the pupil center A as a reference, the ordinate XB corresponding to the point B equal to the abscissa XA is obtained in the upper eyelid contour coordinates, and the palpebral fissure width D is calculated according to the following formula:

[0022] D=|(Y A -Y B )*K|

[0023] Among them, Y A and Y B are the ordinate of the pupil center and the ordinate of point B respectively; K is the mapping relationship.

[0024] Optionally, the palpebral fissure width data is stored, and the change trend of the palpebral fissure width data of the measured person is tracked.

[0025] According to another aspect of an embodiment of the present invention, a method for using a palpebral fissure width measuring device is provided, wherein the measuring device comprises:

[0026] a measuring unit configured to receive and position a head of a person being measured;

[0027] A control unit configured to control the working state of the measuring unit;

[0028] The method comprises:

[0029] Capturing module parameter calibration, the parameter calibration is used to obtain the mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object;

[0030] Adjusting the position of the head of the person being measured that is partially placed in the measuring cavity so that the face of the person being measured faces the shooting module;

[0031] After guiding the measured person to look at the lighted guide light module, the control unit controls the shooting module to shoot the measured person's face to obtain the data to be processed;

[0032] The control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value.

[0033] Optionally, before the control unit segments the data to be processed, it also includes: analyzing the data to be processed and locating the eye area, and then using the data corresponding to the located eye area as the data to be processed; if the noise of the data corresponding to the located eye area exceeds a set threshold, performing Gaussian filtering on the data to be processed, and using the filtered data as the data to be processed.

[0034] Optionally, the control unit divides the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and compares the pupil center coordinates and upper eyelid contour coordinates to obtain the palpebral fissure width measurement value, including:

[0035] Segmenting the data to be processed to separate the eye area, pupil and background, performing circular fitting on the pupil contour, and taking the center coordinates of the circle corresponding to the circle as the pupil center coordinates; and performing edge detection on the eye area and obtaining the upper eyelid contour coordinates through gradient transformation of the image;

[0036] The horizontal coordinate X of the pupil center A A As a reference, find the coordinate corresponding to the horizontal coordinate X in the upper eyelid contour coordinate. A The ordinate X corresponding to the equal point B B , and calculate the palpebral fissure width D according to the following formula:

[0037] D=|(Y A -Y B )*K|

[0038] Among them, Y A and YB are the ordinate of the pupil center and the ordinate of point B respectively; K is the mapping relationship.

[0039] The technical solution of the present invention has at least the following advantages or beneficial effects:

[0040] (1) Part of the head of the person being measured is located in the cavity of the device, which basically closes the open end of the cavity, thereby reducing or eliminating the entry of ambient light into the measurement cavity; effectively avoiding the influence of ambient light on the attention of the person being measured, and improving the measurement accuracy and efficiency. Only a guide light module is provided in the device to avoid the light of the additional fill light affecting the gaze direction of the person being measured, and the light intensity of the fill light will not cause discomfort to the eyes of the person being measured, thereby improving the measurement experience of the person being measured. The measuring device or method of the present invention can accurately locate the head posture of the person being measured, collect the facial data of the person being measured through the shooting module, and automatically identify the data to obtain the palpebral fissure width parameter, thereby improving the accuracy of data measurement and improving the measurement efficiency.

[0041] (2) The eye area is located in the collected data, the eye area in the facial image of the person being measured is located, and the eye area is used as the analysis basis for the subsequent process, which can effectively reduce the data processing volume and processing time, and improve the measurement and analysis speed of the palpebral fissure width.

[0042] (3) Gaussian filtering is performed on the located eye area data to remove image noise, improve data accuracy, and thereby improve measurement accuracy.

[0043] (4) The measuring device can adjust the forehead and jaw position of the measured person so that the measured person maintains a correct head posture, thereby obtaining a clear eye position image and improving the accuracy of the measurement. The measuring device can store the measured person's data and associate the data with the measured person's identity code, thereby facilitating the observation of the change process of the measured person's palpebral fissure width data. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0045] Figure 1 is a schematic diagram of the main structure of a device for measuring palpebral fissure width according to an embodiment of the present invention;

[0046] Figure 2 is a schematic diagram of the working state of the palpebral fissure width measuring device according to an embodiment of the present invention;

[0047] Figure 3 is a schematic diagram of the working process of the palpebral fissure width measuring device according to an embodiment of the present invention;

[0048] Figure 4is a schematic diagram of the principle of obtaining the palpebral fissure width according to an embodiment of the present invention;

[0049] Figure 5-6 It is a schematic diagram of a palpebral fissure width measuring device in the prior art. DETAILED DESCRIPTION

[0050] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0051] In order to solve at least one problem in the background technology, according to one aspect of an embodiment of the present invention, a device for measuring the width of palpebral fissure is provided.

[0052] In order to facilitate understanding of the solution, the measurement device and its measurement principle in the related art are described here. Figure 5-6 As shown, in the related art, the palpebral fissure width is commonly measured with a ruler. Specifically, the measurer allows the measured person to relax, look at the distance in the first eye position (i.e., the measured person looks straight ahead), and maintains a normal head position. The measurer holds the ruler along the plumb bob direction and makes the edge of the ruler with a scale close to the center of the pupil, and visually reads the distance from the central position of the pupil to the edge of the upper eyelid to obtain the palpebral fissure width data. Usually, the palpebral fissure width of the human eye ranges from 3.5 to 5.5 mm. The current measurement method depends on the proficiency of the measurer's hands and the accuracy of the readings. The measurement process is complicated to operate, and the measured person needs to highly cooperate with the operating instructions of the measurer. The error of the visual reading is large, resulting in a large measurement error of the palpebral fissure width. In addition, different measurers have different measurement habits, resulting in large data deviations. When the measured person changes the measurement location or changes the measurement personnel, the measurement data of the palpebral fissure width will fluctuate greatly, the data repeatability is poor, and the change process of the palpebral fissure width cannot be accurately tracked for a long time. Furthermore, the above-mentioned measurement results cannot be preserved for a long time, and part or all of the data is easily lost.

[0053] To this end, an embodiment of the present invention provides a new measuring device, specifically as follows Figure 1 and 2As shown. It includes a measuring unit configured to accommodate and position the head of the person being measured. Since the human eye is more sensitive to light, changes in light outside the measuring device will affect the gaze direction of the person being measured, thereby affecting the measurement results. To this end, the measuring unit in this embodiment has a cavity structure, which is not only used to install the measuring element, but also used to accommodate and position the head of the person being measured. That is, the head part of the person being measured is located in the cavity, which basically closes the open end of the cavity, thereby reducing or eliminating the entry of ambient light into the measurement cavity; effectively avoiding the influence of ambient light on the attention of the measurer, and improving the measurement accuracy and efficiency. Further, the measuring device includes a control unit 107, which is configured to control the working state of the measuring unit. In practice, the control unit and the measuring unit can be designed as an integrated whole to improve the integration; or the two can be set separately. When the split design is adopted, the operator can conveniently observe the head posture of the person being measured and control the working state of the device while operating the control unit. Exemplarily, the control unit may include a display, a keyboard, a host and other structures. The measuring unit includes a measuring cavity 104, which is provided with a shooting module 103 and a guide light module 105. The measuring cavity 104 is arranged on a fixed base 106, and the shooting module is arranged facing the face of the person being measured. The guide light module is located below the shooting module. In practice, in order to reduce the problem of too many noise points in the shooting picture caused by insufficient light of the shooting module, a fill light can be arranged in the measuring cavity. However, the light of the fill light will affect the gaze direction of the person being measured, and the light intensity of the fill light will cause discomfort to the eyes of the person being measured. Therefore, in the preferred embodiment, the fill light is not arranged, and the noise of the shooting picture is removed by image processing means. The guide light module guides the person being measured to look at the preset direction. In response to the need to measure the width of the palpebral fissure, the guide light module in one embodiment of the present invention can provide lighting for the left eye or the right eye respectively. After the guide light module is turned on, the person being measured can adjust the eyeball according to the instruction to look at the light point of the guide light module, thereby forming a shooting posture in which the eyeball looks straight ahead. When in use, the control system can issue a voice prompt and light up the guide light module, and the voice prompt guides the person being measured to look at the guide light. Furthermore, the shooting module includes a parameter calibration step before acquiring the data to be processed, and the parameter calibration step is used to obtain the mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object. In practice, due to the different parameter performances of different shooting modules, the size of the actual object represented by a single pixel will be different, or when the position of the shooting module relative to the human eye is different, the size of the object reflected in the shooting picture is also different. Since the human eye's palpebral fissure width is small, the error generated in the shooting process will amplify the error of the measurement result. How to eliminate the error in the shooting process is particularly important.Therefore, before shooting the picture, it is particularly important to calibrate the shooting module to obtain the actual size represented by each pixel in the picture taken at the current shooting angle. In one embodiment of the present invention, the geometric similarity method is used to achieve the calibration purpose. The method sets the plane of the object to be measured perpendicular to the optical axis of the shooting module, and the imaging plane of the object to be measured and the shooting module are parallel. Preferably, the object to be measured is a calibration plate of known size. After the calibration plate is placed, the calibration plate image is captured by the shooting module, and then the number of pixels N and the actual size D of the calibration plate can be obtained, and finally the proportional coefficient K between the two is converted, and the proportional coefficient K is also called the calibration coefficient. The calculation formula is as follows:.

[0054]

[0055] In actual use, in order to facilitate the operator to calibrate parameters, the calibration plate can be integrated into the measurement cavity and away from the face of the person being measured.

[0056] After the calibration is completed, the control unit can control the shooting module to shoot the face of the person being measured to obtain the data to be processed. Exemplarily, the data to be processed can be image data collected by the shooting module. Further, the control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value.

[0057] Optionally, a forehead support module 101 and / or a jaw support module 102 are further provided in the measurement cavity. Based on the head position information obtained by the shooting module, the control unit controls the movement of the forehead support module to adjust the front and back position of the head; and / or, the control unit controls the movement of the jaw support module to adjust the up and down position of the head. In one embodiment, after the head of the measured person is placed in the measurement cavity, the measurer can adjust the measured head posture to obtain the required shooting angle. By collecting the facial image of the measured person in real time through the shooting module and transmitting the image to the display device of the measurer, the measurer can accurately grasp the head posture of the measured person. When the posture does not meet the shooting requirements, it can send instructions to the control unit to adjust the forehead support module and / or the jaw support module in the measurement cavity. In one embodiment, the forehead support is connected to the horizontal moving platform, and the control unit is electrically connected to the horizontal moving platform to adjust the front and back position of the forehead support; the jaw support is connected to the vertical moving platform, and the control unit is electrically connected to the vertical moving platform to adjust the up and down position of the jaw support. The head position of the subject can be controlled by arranging independent mobile platforms for the jaw support and the forehead support respectively. The mobile platforms are electrically connected to the control unit, so that they can move in real time under the control of the control unit's instructions.

[0058] Optionally, before the control unit divides the data to be processed, it also includes: analyzing the data to be processed and locating the eye area, and then using the data corresponding to the located eye area as the data to be processed. Since the shooting module is usually used to capture the face of the person being measured, it is impossible to only capture the eyes of the person being measured, or when it is necessary to measure the left eye and the right eye of the person being measured at the same time, capturing the face of the person being measured by the shooting module can significantly reduce the amount of data collected and improve the collection efficiency. However, facial data will increase the amount of subsequent data processing and reduce the measurement efficiency. To this end, in one embodiment, the collected data is located in the eye area, the eye area in the facial image of the person being measured is located, and the eye area is used as the analysis basis for the subsequent process, which can effectively reduce the amount of data processing and the processing time, and improve the measurement and analysis speed of the palpebral fissure width. In one embodiment, a facial image recognition method is used to identify facial features (such as eyes, nose, etc.).

[0059] Optionally, if the noise of the data corresponding to the located eye area 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 mentioned above, when the fill light is not set, it can be found that the located eye area generates Gaussian noise due to the shooting field of view not being bright enough or the brightness not being uniform enough during the image acquisition process. Therefore, in order to improve the accuracy of the data and the measurement accuracy, in one embodiment of the present invention, Gaussian filtering is performed on the located eye area data to remove image noise.

[0060] Optionally, the control unit segments the data to be processed to obtain the pupil center coordinates and upper eyelid contour coordinates, including: segmenting the data to be processed to separate the eye area, pupil and background, and performing circular fitting on the pupil contour, using the center coordinates of the circle corresponding to the circle as the pupil center coordinates; and performing edge detection on the eye area and obtaining the upper eyelid contour coordinates through image gradient transformation. In order to accurately obtain the pupil center coordinates and eyelid contour coordinates from the data collected by the shooting module, in one embodiment of the present invention, the image of the eye area after Gaussian filtering is segmented, and the eye area and pupil are separated from the background to display the eye area separately in the image, and other backgrounds are covered with white, and the entire eye area contour and pupil contour are extracted. Further, the segmented image is subjected to Hough circle transformation, the pupil in the image is fitted into a circle, and the center coordinates of the circle are identified, and the center coordinates of the circle are the pupil center coordinates. Furthermore, in order to obtain the eyelid contour, in one embodiment, edge detection is performed again on the segmented image, the contour of the upper eyelid of the human eye is extracted through gradient transformation of the image, and the coordinate point information contained in the contour is stored in a register.

[0061] Optionally, the comparison of the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value includes: taking the abscissa X of the pupil center A as A As a reference, find the coordinate corresponding to the horizontal coordinate X in the upper eyelid contour coordinate. A The ordinate X corresponding to the equal point B B , and calculate the palpebral fissure width D according to the following formula:

[0062] D=|(Y A -Y B )*K|

[0063] Among them, Y A and Y B are the ordinate of the pupil center and the ordinate of point B respectively; K is the mapping relationship.

[0064] like Figure 4 As shown, the circular contour curve 402 of the pupil and its center coordinates (i.e., the center coordinates of the pupil) can be obtained through the processing steps described above; further, the contour curve 401 of the eyelid can be obtained. In practice, the palpebral fissure width is defined as the distance from the center of the pupil A to the corresponding point B on the upper eyelid, and the abscissa of point B is equal to the abscissa of point A. Therefore, when calculating the palpebral fissure width D, only the difference in the ordinate between point A and point B needs to be calculated.

[0065] Optionally, the palpebral fissure width data is stored, and the palpebral fissure width data change trend of the measured person is tracked. In practice, the measured person often goes to different cities, or different institutions in the same city to collect palpebral fissure width data. Therefore, in order to avoid data loss or reduce the burden of the measured person to save data, the measuring device described in one embodiment of the present invention has a data storage function, which stores the palpebral fissure width data and can further store the data in a server or cloud. The data is associated with the identity identification code of the measured person, so the measured person only needs to provide the identification code to query his or her historical measurement data. The identification code can be the ID number, social security number or mobile phone number of the measured person. To this end, a card slot is provided on the base of the measuring device; and / or multiple types of communication interfaces. The card slot includes but is not limited to being used for inserting a social security card, an ID card, etc. The card slot is electrically connected to the card reader module in the base. Correspondingly, the communication interface includes but is not limited to a network access port, a USB interface, etc. It is understood that other types of I / O interfaces may also be integrated on the base of the device, and the I / O interfaces may be used to connect input parts including keyboards, mice, etc.; output parts including cathode ray tubes (CRTs), liquid crystal displays (LCDs), speakers, etc.; storage parts including hard disks, etc.; and communication parts including network interface cards such as LAN cards, modems, etc. The communication part performs communication processing via a network such as the Internet. The drive is also connected to the I / O interface as needed. Removable media, such as magnetic disks, optical disks, magneto-optical disks, semiconductor memories, etc., are installed on the drive as needed so that the computer program read therefrom can be installed into the storage part as needed.

[0066] The second aspect of the embodiment of the present invention provides a method for using a palpebral fissure width measuring device. It should be noted that the same structure or component mentioned in this implementation has the same meaning as that of the first aspect and has the same function, and no specific details are analyzed here. Furthermore, the measuring device in the method includes: a measuring unit configured to accommodate and position the head of the person being measured; a control unit configured to control the working state of the measuring unit. The method includes: calibration of shooting module parameters, the parameter calibration is used to obtain the mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object; adjusting the position of the head of the person being measured partially placed in the measurement cavity so that the face of the person being measured is facing the shooting module; after guiding the person being measured to look at the lit guide light module, the control unit controls the shooting module to shoot the face of the person being measured to obtain the data to be processed; the control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value.

[0067] Optionally, in the method, before the control unit segments the data to be processed, it also includes: analyzing the data to be processed and locating the eye area, and then using the data corresponding to the located eye area as the data to be processed; if the noise of the data corresponding to the located eye area exceeds a set threshold, performing Gaussian filtering on the data to be processed, and using the filtered data as the data to be processed.

[0068] Optionally, in the method, the control unit segments the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates; and compares the pupil center coordinates and upper eyelid contour coordinates to obtain the palpebral fissure width measurement value, including:

[0069] Segmenting the data to be processed to separate the eye area, pupil and background, performing circular fitting on the pupil contour, and taking the center coordinates of the circle corresponding to the circle as the pupil center coordinates; and performing edge detection on the eye area and obtaining the upper eyelid contour coordinates through gradient transformation of the image;

[0070] Taking the abscissa XA of the pupil center A as a reference, the ordinate XB corresponding to the point B equal to the abscissa XA is obtained in the upper eyelid contour coordinates, and the palpebral fissure width D is calculated according to the following formula:

[0071] D=|(Y A -Y B )*K|

[0072] Wherein, YA and YB are the ordinate of the pupil center and the ordinate of point B respectively; K is the mapping relationship.

[0073] The above specific embodiments do not constitute a limitation on the scope of protection of the present invention. Those skilled in the art will easily think of other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The description and examples are regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0074] It should be understood that the present disclosure is not limited to the exact structures 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

1. A device for measuring palpebral fissure width, comprising: a measuring unit configured to receive and position a head of a person being measured; A control unit configured to control the working state of the measuring unit; Features: The measuring unit comprises a measuring cavity, inside which a shooting module and a guide light module are arranged. The guide light module guides the person being measured to look at a preset direction; The shooting module includes a parameter calibration step before acquiring the data to be processed, wherein the parameter calibration step is used to obtain a mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object; The control unit controls the shooting module to shoot the face of the person being measured to obtain data to be processed; The control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value; The measuring cavity is also provided with a forehead support module and / or a jaw support module. Based on the head position information acquired by the camera module, the control unit controls the forehead support module to move to adjust the front and back position of the head; and / or the control unit controls the jaw support module to move to adjust the up and down position of the head; The device is only provided with a guide light module to prevent the light of an additional fill light from affecting the gaze direction of the person being measured; Before the control unit divides the data to be processed, the control unit further includes: Analyze the data to be processed and locate the eye area, and then use the data corresponding to the located eye area as the data to be processed; If the noise of the data corresponding to the located eye area exceeds the set threshold, Gaussian filtering is performed on the data to be processed, and the filtered data is used as the data to be processed; The image of the eye area after Gaussian filtering is segmented, and the eye area and the pupil are separated from the background so that the eye area is displayed separately in the image. The other background is covered with white, and the outline of the entire eye area and the pupil is extracted.

2. The palpebral fissure width measuring device according to claim 1, characterized in that: The control unit segments the data to be processed to obtain pupil center coordinates and upper eyelid contour coordinates, including: Segmenting the data to be processed to separate the eye region, the pupil and the background, performing circular fitting on the pupil contour, and using the center coordinates of the circle corresponding to the circle as the center coordinates of the pupil; and The edge detection of the eye area is performed and the coordinates of the upper eyelid contour are obtained by gradient transformation of the image.

3. The palpebral fissure width measuring device according to claim 1, characterized in that: The method of comparing the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value includes: Taking the abscissa XA of the pupil center A as a reference, the ordinate XB corresponding to the point B equal to the abscissa XA is obtained in the upper eyelid contour coordinates, and the palpebral fissure width D is calculated according to the following formula: D=|(YA-YB)*K| Wherein, YA and YB are the ordinate of the pupil center and the ordinate of point B respectively; and K is the mapping relationship.

4. The palpebral fissure width measuring device according to claim 3, characterized in that: The palpebral fissure width D is stored, and the change trend of the palpebral fissure width D of the measured person is tracked.

5. A method for using a device for measuring palpebral fissure width, the device comprising: a measuring unit configured to receive and position a head of a person being measured; A control unit configured to control the working state of the measuring unit; The measuring unit comprises a measuring cavity, inside which a shooting module and a guide light module are arranged; Characterized in that: the method comprises: Capturing module parameter calibration, the parameter calibration is used to obtain the mapping relationship between a single pixel corresponding to the data to be processed and the actual size of the calibration object; Adjusting the position of the head of the person being measured that is partially placed in the measuring cavity so that the face of the person being measured faces the shooting module; After guiding the measured person to look at the lighted guide light module, the control unit controls the shooting module to shoot the measured person's face to obtain the data to be processed; The control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value; Wherein, a forehead support module and / or a jaw support module are also arranged in the measuring cavity. Based on the head position information acquired by the camera module, the control unit controls the forehead support module to move to adjust the front and back position of the head; and / or the control unit controls the jaw support module to move to adjust the up and down position of the head; The device is only provided with a guide light module to prevent the light of an additional fill light from affecting the gaze direction of the person being measured; Before the control unit divides the data to be processed, the control unit further includes: analyzing the data to be processed and locating the eye area, and then using the data corresponding to the located eye area as the data to be processed; if the noise of the data corresponding to the located eye area exceeds a set threshold, performing Gaussian filtering on the data to be processed, and using the filtered data as the data to be processed; The image of the eye area after Gaussian filtering is segmented, and the eye area and the pupil are separated from the background so that the eye area is displayed separately in the image. The other background is covered with white, and the outline of the entire eye area and the pupil is extracted.

6. The method of use according to claim 5, characterized in that: The control unit divides the data to be processed to obtain the pupil center coordinates and the upper eyelid contour coordinates; and compares the pupil center coordinates and the upper eyelid contour coordinates to obtain the palpebral fissure width measurement value, including: Segmenting the data to be processed to separate the eye area, pupil and background, performing circular fitting on the pupil contour, and taking the center coordinates of the circle corresponding to the circle as the pupil center coordinates; and performing edge detection on the eye area and obtaining the upper eyelid contour coordinates through gradient transformation of the image; Taking the abscissa XA of the pupil center A as a reference, the ordinate XB corresponding to the point B equal to the abscissa XA is obtained in the upper eyelid contour coordinates, and the palpebral fissure width D is calculated according to the following formula: D=|(YA-YB)*K| Wherein, YA and YB are the ordinate of the pupil center and the ordinate of point B respectively; and K is the mapping relationship.

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