A strabismus measuring instrument eye occlusion intelligent adjustment method and strabismus measuring instrument

Abstract

The present invention proposes an intelligent adjustment method for eye occlusion of a strabismus measuring instrument, the method comprising the following steps of taking a face image through a measurement window of a preset strabismus measuring instrument and executing: obtaining a first face image and confirming a first position and size of an eye area; obtaining a size ratio of a preset measurement window to the face image, and controlling the measurement window to form an occlusion area according to the size ratio and the first position and size of the eye area; and controlling the occlusion area to change light and dark according to a preset occlusion strategy. The present invention can dynamically form an occlusion area of ​​suitable size at the left and right eyes, and form an occlusion effect according to a preset occlusion strategy, and can capture the movement of the eyeball after occlusion and its second position state through a specific camera, so as to accurately calculate the degree of strabismus of the user by calculating the relative value of the second position state to the first position state.

Description

Technical Field

[0001] The present invention relates to the field of ophthalmic medical equipment, and in particular to an eye occlusion intelligent adjustment method for a strabismus measuring instrument and a strabismus measuring instrument. Background Art

[0002] Strabismus is one of the common clinical eye diseases that affects 2%-5% of the population. When patients with strabismus use their binocular vision, their eyes cannot be properly coordinated and cooperated. Common manifestations include esotropia, exotropia, and up and down strabismus.

[0003] At present, the clinical measurement methods for strabismus mainly use two test methods: corneal light reflection test and prism cover test (PCT). The former measures the type of strabismus and the angle of deviation (i.e., the degree of strabismus) based on the position of light reflection to the center of the pupil, which can achieve accurate measurement of the degree of strabismus, while the latter requires the optometrist to cover the eyes alternately, observe eye movements, and then estimate the degree of deviation to quickly determine the type of strabismus. However, the traditional shutter needs to use the left and right movement of the moving baffle to achieve shading. Although this shading method can achieve a good shading effect, it will also cause visual traction, resulting in the inability of the human eye to lose focus quickly, thereby affecting the detection efficiency. Summary of the invention

[0004] In order to avoid visual traction and ensure the occlusion effect, a first aspect of the present invention proposes an intelligent adjustment method for eye occlusion of a strabismus measuring instrument, the method comprising the following steps of taking a facial image through a measuring window of a preset strabismus measuring instrument: obtaining a first facial image and confirming a first position and size of an eye area therein; obtaining a size ratio of a preset measuring window to the facial image, and controlling the measuring window to form an occlusion area according to the size ratio and the first position and size of the eye area; and controlling the occlusion area to change in brightness according to a preset occlusion strategy.

[0005] In one or more embodiments, the eye occlusion intelligent adjustment method of the strabismus measuring instrument of the present invention further includes: acquiring a second facial image after the eyes are occluded and determining a second position of the eye area therein; calculating the relative displacement between the first position and the second position; and adjusting the position of the occluded area in the measurement window according to the relative displacement.

[0006] In one or more embodiments, the eye occlusion intelligent adjustment method of the strabismus measuring instrument of the present invention further includes: starting timing from the time when the eye is occluded, counting the state adjustment time of the eye from the first position to the second position; and updating the delay time of the light and dark change in the preset occlusion strategy according to the state adjustment time.

[0007] In one or more embodiments, the eye occlusion intelligent adjustment method of the strabismus measuring instrument of the present invention further includes: capturing the nose area in multiple first or second facial images in real time and calculating its center displacement; judging the size of the center displacement and a preset adjustment threshold; in response to the center displacement being greater than the preset adjustment threshold, adjusting the position of the occluded area in the measurement window according to the center displacement.

[0008] In one or more embodiments, the eye occlusion intelligent adjustment method of the strabismus measuring instrument of the present invention further includes: in response to the center displacement being less than or equal to the preset adjustment threshold, not adjusting the position of the occluded area in the measurement window.

[0009] In one or more embodiments, obtaining a first facial image and confirming a first position and size of an eye region includes: performing grayscale processing on the first facial image and extracting grayscale features; and determining a first position and size of an eye pupil region based on the grayscale features.

[0010] In one or more embodiments, the measurement window is controlled to form an occlusion area according to the size ratio and the first position and size of the eye area, including: determining the X-axis distance and the Y-axis distance of the eye pupil area in the first facial image from the nearest image edge; determining the first position of the occlusion area in the measurement window according to the first size ratio and the X-axis distance and the Y-axis distance; determining the size of the occlusion area in the measurement window according to the second size ratio and the size of the eye pupil area in the first facial image; wherein the first size ratio is equal to the ratio of the image size to the measurement window size, and the second size ratio is greater than the ratio of the image size to the measurement window size.

[0011] In one or more embodiments, the light and dark changes of the occlusion area are controlled according to a preset occlusion strategy, including: controlling the occlusion areas corresponding to both eyes to change light and dark alternately according to the preset occlusion strategy, controlling the occlusion areas corresponding to both eyes to change light and dark synchronously, or keeping the occlusion area corresponding to one eye always dark and controlling the occlusion area corresponding to the other eye to change light and dark alternately.

[0012] In a second aspect of the present invention, a strabismus measuring instrument is proposed, comprising: a measuring window for controllably forming a facial occlusion area; a camera for capturing a facial image through the measuring window and / or the occlusion area; and a controller, the controller being electrically connected to the measuring window and the camera, respectively, and being used to execute a preset control program to implement the steps of the eye occlusion intelligent adjustment method of the strabismus measuring instrument as described in any one of claims 1 to 8.

[0013] In one or more embodiments, the measurement window is formed of electrically controlled dimming glass.

[0014] The beneficial effects of the present invention include: the present invention can dynamically form occlusion areas of suitable sizes at the left and right eyes, and form an occlusion effect according to a preset occlusion strategy without causing visual traction, thereby effectively improving detection efficiency; in addition, the present invention can also capture the movement of the eyeball after occlusion through a specific camera to improve the accuracy of amplitude measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a flowchart of the intelligent adjustment method for eye occlusion of a strabismus measuring instrument according to an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of calculating the position of the occluded area according to the size ratio of the preset measurement window to the face image and the position of the human eye according to an embodiment of the present invention;

[0018] Figure 3 Schematic diagram of the structure of a strabismus measuring instrument according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0021] In order to avoid visual traction and ensure the occlusion effect, in one embodiment of the present invention, a method for intelligently adjusting eye occlusion of a strabismus measuring instrument is proposed, such as Figure 1 As shown, the method includes: step S1, obtaining a first face image and confirming a first position and size of an eye area; step S2, obtaining a size ratio of a preset measurement window to the face image, and controlling the measurement window to form an occlusion area according to the size ratio and the first position and size of the eye area; step S3, controlling the occlusion area to change light and dark according to a preset occlusion strategy.

[0022] In one embodiment, the first face image can be captured by a full-color camera or a near-infrared monochrome camera, and is mainly used to identify the position of the human eye, so as to determine the position and size of the occlusion area that needs to be formed on the observation window. In order not to affect the normal vision of the other eye, the area of ​​the occlusion area should not be too large, so it is necessary to be able to follow the involuntary movement of the occluded eyeball and dynamically adjust the position of the occlusion area to ensure the occlusion effect. Specifically, for patients with a certain degree of strabismus, when the viewpoint is lost (that is, the line of sight is blocked), the eyeball cannot remain in a straight-looking state and deflects. At this time, the occlusion area needs to move with it to ensure the occlusion effect.

[0023] In one embodiment, the method of the present invention further includes: acquiring a second facial image after the eyes are occluded and determining a second position of the eye area; calculating the relative displacement between the first position and the second position; and adjusting the position of the occluded area in the measurement window according to the relative displacement.

[0024] In one embodiment, the second face image is captured by an imager operating in a specific color range of infrared; accordingly, the measurement window in this embodiment is formed by electrically controlled glass, which has the characteristics of shielding visible light and selectively highly transmitting near-infrared light (especially for the 800-1100nm band), and blocks the left and right eyes of the observer respectively according to the control system and inspection requirements, and can record the movement of the covered eyes. The second position in this embodiment refers to the position after the eyeball is involuntarily deviated after being blocked. In order to ensure the blocking effect, the blocking area in this embodiment will move accordingly.

[0025] In one embodiment, the method of the present invention further includes: starting timing from when the eye is blocked, counting the state adjustment time of the eye from the first position to the second position; and updating the delay time of the light and dark change in the preset blocking strategy according to the state adjustment time. This embodiment can dynamically adjust the blocking strategy according to the user's strabismus type and individual differences, thereby improving measurement efficiency and accuracy.

[0026] In one embodiment, the method of the present invention also includes: capturing the area where the nose is located in the first or second face image in real time and calculating its center displacement; judging the size of the center displacement and a preset adjustment threshold; in response to the center displacement being greater than the preset adjustment threshold, adjusting the position of the occluded area in the measurement window according to the center displacement; in response to the center displacement being less than or equal to the preset adjustment threshold, not adjusting the position of the occluded area in the measurement window.

[0027] Specifically, strabismus patients may twist their heads when looking at objects, or children may move around. In order to ensure the occlusion effect, the first camera can continuously capture facial images, identify the nose area through the image, and determine whether to adjust the position of the occlusion area based on the center displacement of the nose area. When the center displacement is greater than a preset threshold, the position of the occlusion area is adjusted. When the center displacement is less than or equal to the preset threshold, no adjustment is required. When the center displacement is greater than the preset threshold, the captured image is stopped from being uploaded until the center displacement is less than or equal to the preset threshold, and then the image is continued to be uploaded for strabismus detection.

[0028] In one embodiment, obtaining a first facial image and confirming a first position and size of an eye region includes: performing grayscale processing on the first facial image and extracting grayscale features; and determining a first position and size of an eye pupil region based on the grayscale features.

[0029] Specifically, before extracting grayscale features, the image needs to be preprocessed to remove noise, and the frequency domain method is used to eliminate noise by using the useful information of the digital image in the low-frequency part; then the grayscale features are extracted by the following steps, including drawing the histogram of the image for the threshold of the grayscale image, drawing the histogram of the image for the threshold of the grayscale image to select the best threshold for image segmentation, and reducing the probability of the standard deviation of the two preset brightness to the minimum; selecting the best threshold for image segmentation; adding edge identification points to the grayscale image after segmentation, and adding edge identification points to the grayscale image after segmentation through the double threshold The boundary of the grayscale image is calibrated with a value, and two edge thresholds Max and Min are obtained. When the amplitude is greater than Max, it is determined to be a boundary point, and when it is less than Min, it is determined not to be a boundary point. The value in the middle indicates that it may be a boundary point or not a boundary point. The three types of boundary point judgment results are marked respectively; based on the edge array, the high threshold Max is mainly used to obtain the edge points, and the edge threshold Min is used to supplement the points, and finally the edge recognition point image is obtained; the threshold recognition point distribution map is output, and the position and size of the eye pupil are identified according to the shape, position and / or whether there is a symmetrical image of the threshold recognition point distribution map.

[0030] In one embodiment, controlling the measurement window to form an occlusion area according to a size ratio and the position and size of an eye area includes: determining an X-axis distance and a Y-axis distance of an eye pupil area in a first image from the nearest image edge; determining a first position of the occlusion area in the measurement window according to a first size ratio and the X-axis distance and the Y-axis distance; determining a size of the occlusion area in the measurement window according to a second size ratio and the size of the eye area in the first image; wherein the first size ratio and the second size ratio are both obtained based on a preset size ratio of the measurement window and the face image, and optionally, the first size ratio is equal to the preset size ratio, and the second size ratio is greater than the preset size ratio so that the formed occlusion area is larger than the eye area.

[0031] Specifically, Figure 2 As shown, since the image needs to cover the entire measurement window when capturing a face image, and the image size is fixed to the measurement window size, there is a specific proportional relationship between the captured image and the window size. This embodiment requires obtaining the image resolution, size, and measurement window size of the images captured by multiple groups of cameras in advance, so as to obtain the proportional relationship between the two, and then determine the position of the eye area in the measurement window (i.e., X1 and Y1) according to the proportional relationship based on the distance of the eye area from the edge of the image in the X-axis direction (i.e., X2) and the distance from the edge of the image in the Y-axis direction (i.e., Y2), so as to form a occlusion area of ​​a preset size at this position. Among them, the first size ratio is equal to the ratio of the image size to the measurement window size (i.e., X2 / X1 and Y2 / Y1), and the second size ratio is greater than the ratio of the image size to the measurement window size (i.e., X2 / X1 or Y2 / Y1), so as to form an occlusion area larger than the eye area.

[0032] In one embodiment, controlling the light and dark changes of the occluded area according to a preset occlusion strategy includes: controlling the occluded areas corresponding to both eyes to change light and dark alternately according to the preset occlusion strategy, controlling the occluded areas corresponding to both eyes to change light and dark synchronously, or keeping the occluded area corresponding to one eye always dark and controlling the occluded area corresponding to the other eye to change light and dark alternately.

[0033] In an optional embodiment, the occlusion strategy is as follows: an occlusion area is formed at the right eye, and a gray state (i.e., a state of filtering visible light) is maintained for 1 second; (initial position), the occlusion area is kept transparent for 1 second after a delay of 0.3 seconds, and the gray state is maintained for 5 seconds after a delay of 0.3 seconds, and then the occlusion area is kept transparent for 0.3 seconds, completing the first detection of the right eye; then a second detection of the right eye is performed, including the occlusion area being kept transparent for 1 second, and the gray state is maintained for 5 seconds after a delay of 0.3 seconds, and then the transparent state is maintained for 0.3 seconds; then a third detection of the right eye is performed, the occlusion area is kept transparent for 1 second, and the gray state is maintained for 5 seconds after a delay of 0.3 seconds, and then the transparent state is restored after a delay of 0.6 seconds;

[0034] The left eye is tested for the first time, the occluded area remains transparent for 1 second, remains dark for 5 seconds after a delay of 0.3 seconds, and then returns to transparent state after a delay of 0.3 seconds; the left eye is tested for the second time, the occluded area remains transparent for 1 second, remains dark for 5 seconds after a delay of 0.3 seconds, and then returns to transparent state after a delay of 0.3 seconds; the left eye is tested for the third time, the occluded area remains transparent for 1 second, remains dark for 5 seconds after a delay of 0.3 seconds;

[0035] The left and right eyes are tested alternately for the first time. After a delay of 0.3s, the occluded area of ​​the right eye remains dark for 2s. After a delay of 0.3s, the occluded area of ​​the right eye returns to a transparent state, and the occluded area of ​​the left eye remains dark for 2s.

[0036] The left and right eyes are tested alternately for the second time. After a delay of 0.3s, the occluded area at the right eye remains dark for 2s. After a delay of 0.3s, the occluded area at the right eye returns to a transparent state and the occluded area at the left eye remains dark for 2s.

[0037] The left and right eyes are tested alternately for the third time. After a delay of 0.3s, the occluded area at the right eye remains in a dark state for 2s. After a delay of 0.3s, the occluded area at the right eye returns to a transparent state, and the occluded area at the left eye remains in a dark state for 2s. Then, after a delay of 0.3s at both eyes, the occluded area at the right eye returns to the initial state of being in a dark state.

[0038] In an optional implementation, after the first monocular detection is performed, the delay time in the above detection process is automatically adjusted according to the adjustment time required for the right eye to move from the first position to the second position (both are stable states) after being blocked, thereby improving the detection efficiency while ensuring that the visual field is completely closed. The delay time is set as the adjustment time + 0.1s.

[0039] Through the above embodiments, the present invention can dynamically form an occlusion area of ​​suitable size at the left and right eyes, and form an occlusion effect according to a preset occlusion strategy without causing visual distraction, thereby effectively improving the detection efficiency; in addition, the present invention can also capture the movement of the eyeball after occlusion through a specific camera to improve the accuracy of amplitude measurement. .

[0040] In a second aspect of the present invention, a strabismus measuring instrument is provided, such as Figure 3As shown, it includes: a measuring window 100, which is used to controllably form a facial occlusion area; a camera 200, which is used to capture facial images through the measuring window and / or the occlusion area; and a controller 300, which is electrically connected to the measuring window 100 and the camera 200, respectively, and is used to execute a preset control program to implement the steps of the eye occlusion intelligent adjustment method of the strabismus measuring instrument in any of the above method embodiments. The measuring window is formed by electrically controlled dimming glass, and the middle layer of the dimming glass is added with a near-infrared light medium electrolyte. After power is turned on, the color can be changed to achieve filtering, so that the user cannot observe the visual mark of a specific color, thereby achieving a occlusion effect. The camera 200 and the controller 300 are arranged inside the shell of the strabismus measuring instrument. Figure 3 Not shown.

[0041] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope of the embodiments disclosed in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order.

[0042] The serial numbers of the embodiments disclosed in the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments. Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope disclosed in the embodiments of the present invention (including the claims) is limited to these examples; under the idea of ​​the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. An intelligent adjustment method for eye occlusion of a strabismus measuring instrument, characterized in that: The method comprises the following steps: a predetermined strabismus measuring instrument is used to capture a facial image through a measuring window thereof and executes: Acquire a first face image and determine a first position and size of an eye region therein; Acquire a size ratio of a preset measurement window to the face image, and control the measurement window to form an occlusion area according to the size ratio and the first position and size of the eye area; The shading area is controlled to change light and dark according to a preset shading strategy.

2. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 1, characterized in that: The method further comprises: Acquire a second face image after the eyes are blocked and determine a second position of the eye region therein; calculating a relative displacement between the first position and the second position; The position of the shielding area in the measurement window is adjusted according to the relative displacement.

3. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 2, characterized in that: The method further comprises: Starting from the time when the eyes are blocked, counting the time it takes for the eyes to adjust from the first position to the second position; The delay time of the light and dark change in the preset shading strategy is updated according to the state adjustment time.

4. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 1 or 2, characterized in that: The method further comprises: capturing the nose area in a plurality of first or second face images in real time and calculating the center displacement thereof; Determining the magnitude of the center displacement and a preset adjustment threshold; In response to the center displacement being greater than the preset adjustment threshold, the position of the occluded area in the measurement window is adjusted according to the center displacement.

5. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 4, characterized in that: The method further comprises: In response to the center displacement being less than or equal to the preset adjustment threshold, the position of the occluded area in the measurement window is not adjusted.

6. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 1, characterized in that: Acquire a first face image and determine a first position and size of an eye region, including: Performing grayscale processing on the first face image and extracting grayscale features; A first position and size of a region where a pupil of the eye is located is determined based on the grayscale feature.

7. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 6, characterized in that: Controlling the measurement window to form a shielding area according to the size ratio and the first position and size of the area where the eye is located includes: Determine an X-axis distance and a Y-axis distance of an eye pupil region in the first face image from the nearest image edge; Determine a first position of the shielding area in the measurement window according to a first size ratio and the X-axis distance and the Y-axis distance; Determining the size of the blocked area in the measurement window according to the second size ratio and the size of the pupil area of ​​the eye in the first facial image; The first size ratio is equal to the ratio of the image size to the measurement window size, and the second size ratio is greater than the ratio of the image size to the measurement window size.

8. The method for intelligently adjusting eye occlusion of a strabismus measuring instrument according to claim 1, characterized in that: Controlling the light and dark changes of the occluded area according to a preset occlusion strategy includes: According to a preset occlusion strategy, the occlusion areas corresponding to both eyes are controlled to change light and dark alternately, the occlusion areas corresponding to both eyes are controlled to change light and dark synchronously, or the occlusion area corresponding to one eye is kept dark and the occlusion area corresponding to the other eye is controlled to change light and dark alternately.

9. A strabismus measuring instrument, characterized in that: include: A measurement window for controllably forming a facial occlusion area; A camera, used for capturing a facial image through the measurement window and / or the shielded area; A controller, wherein the controller is electrically connected to the measuring window and the camera, respectively, and is used to execute a preset control program to implement the steps of the eye occlusion intelligent adjustment method of the strabismus measuring instrument as described in any one of claims 1 to 8.

10. The strabismus measuring instrument according to claim 9, characterized in that: The measuring window is formed by electrically controlled dimming glass.

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