A precise pupil measurement instrument

Abstract

A precise pupil measuring instrument relating to the technical field of medical assistive devices comprises a CCD camera and a housing, wherein the housing is in the shape of a gun, the handle of the housing being a battery compartment for installing a battery, the CCD camera being provided at the gun end of the housing, a microprocessor and a storage unit being provided within the housing, a display being provided at the end of the housing facing away from the CCD camera, and a control switch for controlling the CCD camera being provided on the inner side of a corner of the housing; a guide rod being provided on the side of the housing corresponding to the CCD camera, an arc-shaped positioning block being provided at the end of the guide rod facing away from the housing, an arc-shaped lighting strip being embedded in the inner arc surface of the arc-shaped positioning block, and a cross coordinate for reference being provided on the side of the arc-shaped positioning block corresponding to the guide rod; the present invention utilizes a CCD camera and image measurement algorithm technology to achieve precise measurement of a patient's pupil.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary appliances, and in particular to a precise pupil measuring instrument. Background Art

[0002] As is known to all, the eyes are important organs for acquiring information in the human body. While acquiring external light radiation information, they also reflect the pathological conditions of multiple tissues and organs in the human body. By observing and measuring the eyes, not only can ophthalmic diseases be discovered, but even some systemic diseases can be diagnosed early. Medical staff often use two traditional methods to judge pupils: subjective judgment and pupil ruler comparison. The subjective judgment method mainly relies on the work experience of medical staff and uses an ordinary pupil light pen to directly illuminate the pupil to determine the pupil state. The pupil ruler comparison method mainly uses a card with different marks on it to determine the pupil state. Medical staff use a simulated pupil diagram of the same diameter, marked with different pupil size scales, to compare the diagram with the patient's pupil size and perform measurements. Both methods have obvious flaws: the subjective judgment method is difficult for young medical staff who lack clinical work experience to master in a short period of time, and the pupil judgment error is large; the pupil ruler comparison method is still required by medical staff to compare with the naked eye to obtain data, which still causes subjective errors. In addition, the sharp edge of the pupil ruler paper can easily cut the patient's cornea, causing secondary damage to the patient.

[0003] With the continuous development of science and technology, technologies have emerged that measure distance by taking pictures. They are mainly divided into the following categories: stereo vision ranging, monocular ranging, angular ranging, and ranging methods based on the infrared radiation characteristics of the target. These technologies have been widely used in technical fields such as part size measurement, appearance inspection, vehicle system applications, biomedical testing and analysis, aerial remote sensing measurement, military and public security applications. The widespread application and development of image ranging technology is not only due to the continuous expansion of application demand areas, but also due to the development and improvement of computer technology and digital image processing technology. The emergence of high-resolution CCD digital cameras and video cameras not only meets the needs of solution accuracy, but also greatly shortens the time for image data acquisition and transmission, and improves work efficiency. However, the technology of pupil measurement through CCD cameras needs further research. Summary of the Invention

[0004] In order to overcome the deficiencies in the background technology, the present invention discloses a precise pupil measuring instrument.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0006] A precision pupillometer includes a CCD camera and a housing. The housing is gun-shaped, with a handle located at a battery compartment for installing batteries. The CCD camera is located at the gun-tip end of the housing. A microprocessor and a storage unit are located within the housing. A display screen is located at the end of the housing facing away from the CCD camera, and a control switch for controlling the CCD camera is located inside a corner of the housing. A guide rod is located on a side of the housing corresponding to the CCD camera, and an arc-shaped positioning block is located at the end of the guide rod facing away from the housing. A curved lighting strip is embedded in the inner curved surface of the curved positioning block, and a cross coordinate for reference is located on the side of the curved positioning block corresponding to the guide rod.

[0007] The method for measuring the pupil aperture using a CCD camera is as follows: first, the arc-shaped positioning block is brought into contact with the outer side of the patient's outer canthus, the lighting strip is turned on, the CCD camera is controlled by a control switch to capture an image, and the captured image is stored in a storage unit inside the shell. The pupil and cross coordinates in the captured image are subjected to grayscale conversion, edge detection, threshold segmentation, noise point removal in coarse edges, and edge center extraction in sequence by a microprocessor inside the shell. The extracted pupil and the edge center of the cross coordinate are then overlapped and superimposed. The patient's pupil aperture can be calculated based on the cross coordinate distance feature, and the measurement result can be displayed on a display screen.

[0008] Preferably, the guide rod is plugged into the housing in a corresponding damping manner, and the cross section of the guide rod is a rectangular structure.

[0009] Preferably, a fill light is provided above the gun head end of the shell corresponding to the CCD camera.

[0010] Preferably, an operation button is provided below the housing corresponding to the display screen.

[0011] Preferably, a silicone pad is provided on the side of the arc-shaped positioning block facing away from the guide rod.

[0012] Preferably, the cross coordinate is red and has a color that is clearly different from that of the arc-shaped positioning block.

[0013] Preferably, a wireless data transmission module is provided in the housing.

[0014] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0015] The present invention discloses a precise pupillometer with a simple structure and high measurement accuracy. A microprocessor in a housing sequentially performs grayscale conversion, edge detection, threshold segmentation, noise point removal from coarse edges, and edge center extraction on the pupil and cross coordinates in a captured image. The extracted pupil and the edge center of the cross coordinate image are then superimposed. The aperture of the patient's pupil can be calculated based on the scale characteristics of the cross coordinates, and the measurement results can be displayed on a display screen. During use, a CCD camera can be controlled to continuously capture multiple images of the patient's eye. The measurement results of the captured images are then averaged after removing the maximum and minimum values, thereby further improving measurement accuracy.

[0016] The guide rod is connected to the housing with a corresponding damping plug, and the cross-section of the guide rod is a rectangular structure, that is, the guide rod can be inserted into the housing when not in use, which can effectively reduce the volume and facilitate storage, while preventing the guide rod from accidentally bending or breaking during storage; the inner curved surface of the arc-shaped positioning block is embedded with an arc-shaped lighting strip, that is, the lighting strip can provide light from the side, preventing corneal reflection from affecting the effect of CCD camera capturing images;

[0017] In addition, a fill light is provided above the CCD camera at the gun tip end of the shell, which can enhance the lighting effect through the fill light so that the CCD camera can better capture images in a dark environment; an operation button is provided below the shell corresponding to the display screen, which can be used to select functions or review previous measurement data; a silicone pad is provided on the side of the arc-shaped positioning block away from the guide rod. The silicone pad is soft in texture and can effectively improve the patient's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 3 Schematic diagram of the pupil and the edge center of the cross coordinate image after superposition and overlap.

[0021] In the figure: 1. CCD camera; 2. Housing; 3. Battery compartment; 4. Display screen; 5. Control switch; 6. Guide rod; 7. Arc positioning block; 8. Light strip; 9. Cross coordinate; 10. Fill light; 11. Operation button; 12. Silicone pad. DETAILED DESCRIPTION

[0022] The present invention can be explained in detail by the following examples, the purpose of which is to disclose the present invention and to protect all technical improvements within the scope of the present invention.

[0023] Combined with attachment Figures 1 to 3 , a precise pupil measuring instrument, comprising a CCD camera 1, and also comprising a shell 2, the shell 2 being in a gun-shaped structure, the handle position of the shell 2 being a battery compartment 3 for installing a battery, the gun-tip end of the shell 2 being provided with a CCD camera 1, a microprocessor and a storage unit being provided in the shell 2, a display screen 4 being provided at the end of the shell 2 facing away from the CCD camera 1, and a control switch 5 for controlling the CCD camera 1 being provided on the inner side of the corner position of the shell 2; a guide rod 6 is provided on the side of the shell 2 corresponding to the CCD camera 1, and an arc-shaped positioning block 7 is provided on the end of the guide rod 6 facing away from the shell 2; as needed, the guide rod 6 is correspondingly damped and plugged into the shell 2, and the cross section of the guide rod 6 is a rectangular structure, that is, the guide rod can be moved when not in use 6 is inserted into the shell 2, which can effectively reduce the volume and facilitate storage, and at the same time can prevent the guide rod 6 from being accidentally bent or broken during storage; the inner arc surface of the arc-shaped positioning block 7 is embedded with an arc-shaped lighting strip 8, that is, the lighting strip 8 can provide light from the side to prevent corneal reflection from affecting the effect of the CCD camera 1 capturing the image; the arc-shaped positioning block 7 is provided with a cross coordinate 9 for reference on the side corresponding to the guide rod 6, and the cross coordinate 9 can provide a reference basis for measurement to avoid large deviations in measurement results due to shooting angle problems; according to needs, the cross coordinate 9 is a red mark and is significantly different from the color of the arc-shaped positioning block 7, which can improve recognition and facilitate rapid extraction of the cross coordinate 9 during image processing;

[0024] The method for measuring the pupil aperture by the CCD camera 1 is as follows: first, the arc-shaped positioning block 7 is brought into contact with the outer side of the outer corner of the patient's eye, the lighting strip 8 is turned on, the CCD camera 1 is controlled by the control switch 5 to capture an image, and the captured image is stored in the storage unit in the housing 2, and the pupil and the cross coordinate 9 in the captured image are grayed, edge detected, threshold segmented, noise points in the coarse edge are removed, and the edge center is extracted by the microprocessor in the housing 2, and then the extracted pupil and the edge center of the cross coordinate 9 image are overlapped and superimposed, and the patient's pupil aperture can be calculated according to the scale feature of the cross coordinate 9, and the measurement result can be displayed on the display screen 4; when in use, the CCD camera 1 can be controlled to continuously capture multiple images of the patient's eye, and then the measurement results of the captured images are averaged after removing the maximum and minimum values, so as to further improve the measurement accuracy;

[0025] In addition, a fill light 10 is provided above the CCD camera 1 at the gun tip end of the shell 2, that is, the fill light 10 can enhance the lighting effect so that the CCD camera 1 can better capture images in a dark environment; an operation button 11 is provided below the display screen 4 of the shell 2, that is, the function selection or review of previous measurement data can be performed through the operation button 11; a silicone pad 12 is provided on the side of the arc-shaped positioning block 7 away from the guide rod 6, and the silicone pad 12 is soft in texture and can effectively improve the comfort of the patient; a wireless data transmission module is provided in the shell 2, that is, the measurement information can be transmitted to the medical staff's PC terminal through the wireless data transmission module, which is convenient for medical staff to perform analysis and diagnosis, as well as the safe storage of measurement data.

[0026] In the present invention, unless otherwise specified or limited, the terms "installation", "setting", "connection", "fixation", "screw connection", etc. should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements. Unless otherwise specified or limited, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0027] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A precise pupil measuring instrument comprising a CCD camera (1), characterized in that: The invention also comprises a shell (2), wherein the shell (2) is in a gun-shaped structure, the handle position of the shell (2) is a battery compartment (3) for installing a battery, a CCD camera (1) is provided at the gun head end of the shell (2), a microprocessor and a storage unit are provided in the shell (2), a display screen (4) is provided at the end of the shell (2) facing away from the CCD camera (1), and a control switch (5) for controlling the CCD camera (1) is provided on the inner side of the corner position of the shell (2); a guide rod (6) is provided on the side of the shell (2) corresponding to the CCD camera (1), an arc-shaped positioning block (7) is provided on the end of the guide rod (6) facing away from the shell (2), an arc-shaped lighting strip (8) is embedded in the inner arc surface of the arc-shaped positioning block (7), and a cross coordinate (9) for reference is provided on the side of the arc-shaped positioning block (7) corresponding to the guide rod (6); The method for measuring pupil diameter by using a CCD camera (1) is as follows: first, an arc-shaped positioning block (7) is brought into contact with the outer side of the patient's outer corner of the eye, a lighting strip (8) is turned on, and the CCD camera (1) is controlled by a control switch (5) to capture an image, and the captured image is stored in a storage unit in a housing (2). The pupil and the cross coordinate (9) in the captured image are sequentially grayed, edge detected, threshold segmented, noise points in the coarse edge are removed, and the edge center is extracted by a microprocessor in the housing (2). Then, the extracted pupil and the edge center of the cross coordinate (9) are overlapped and superimposed, and the pupil diameter of the patient can be calculated based on the distance feature of the cross coordinate (9), and the measurement result can be displayed on a display screen (4).

2. The precise pupil measuring instrument according to claim 1, wherein: The guide rod (6) is correspondingly damped and plugged into the housing (2), and the cross section of the guide rod (6) is a rectangular structure.

3. The precise pupil measuring instrument according to claim 2, wherein: A fill light (10) is provided above the gun head end of the shell (2) corresponding to the CCD camera (1).

4. The precise pupil measuring instrument according to claim 1, wherein: An operating button (11) is provided below the housing (2) corresponding to the display screen (4).

5. The precise pupil measuring instrument according to claim 1, wherein: A silicone pad (12) is provided on the side of the arc-shaped positioning block (7) facing away from the guide rod (6).

6. The precise pupil measuring instrument according to claim 1, wherein: The cross coordinate (9) is red and has a distinct color from the arc-shaped positioning block (7).

7. The precise pupil measuring instrument according to claim 1, wherein: A wireless data transmission module is provided in the housing (2).

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