Ankle spacing and knee spacing identification method and identification device

Abstract

The present invention provides a method and device for identifying ankle and knee distances, belonging to the technical field of medical assistive devices. The method comprises: S1: wearing a marker at the knee or ankle joint; S2: acquiring an image containing the knee or ankle joint as the image to be identified; S3: searching for the marker at the knee or ankle joint in the image to be identified, identifying the marker to form an image to be measured; S4: in the image to be measured, using the intersection of the knee marker and the outer side of the knee joint, or the intersection of the ankle marker and the outer side of the ankle joint, as a feature point, drawing a perpendicular line perpendicular to the height of the human body through the feature point as a measurement standard line; and identifying the length of the unobstructed area between two obstructed areas on the measurement standard line as the ankle or knee distance. The present invention can automatically identify feature points on the ankle and knee joints, improving the consistency of data when measuring knee and ankle distances.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical auxiliary equipment and relates to an identification method and an identification device for ankle spacing and knee spacing. Background Art

[0002] The knee joint is the largest and most complex joint in the human body. Knee varus and knee valgus are the most common clinical manifestations of knee dysplasia. Knee varus is also known as bow legs, while knee valgus is also known as X-legs. Mild cases of knee angulation (knee varus or knee valgus) merely affect the appearance of the lower limb without significant pain or impairment of mobility. Severe cases can lead to severe knee deformity, limited flexion and extension, and may eventually develop into osteoarthritis, severely impacting patients' daily lives.

[0003] In the process of evaluating human development, knee joint development is also one of the evaluation indicators. In the existing technology, the measurement indicators of knee joint development are knee distance or ankle distance. The knee distance refers to the distance between the inner sides of the two knees when the two feet are together; the ankle distance refers to the distance between the inner sides of the two ankles when the two feet are together. Among them, if the knee distance or ankle distance is less than or equal to 3 cm, it is mild knee dysplasia; if the knee distance or ankle distance is greater than 3 cm and less than or equal to 10 cm, it is moderate knee dysplasia; if the knee distance or ankle distance is greater than 3 cm and less than or equal to 10 cm, it is moderate knee dysplasia; if the knee distance or ankle distance is greater than 10 cm, it is severe knee dysplasia.

[0004] In the prior art, the measurement of knee-to-ankle distance is generally performed manually. However, the measurement process is affected by factors such as inaccurate positioning of the characteristic points of the two ankles or two knees and errors in manual data reading, resulting in technical problems such as large errors in the measurement results. Summary of the Invention

[0005] In view of the technical problem described in the above background technology, the existing manual measurement of knee spacing or ankle spacing is affected by factors such as inaccurate positioning of the characteristic points of the two ankles or two knees and human reading errors, resulting in measurement errors. To address this technical problem, the present invention proposes a method and device for identifying ankle spacing and knee spacing.

[0006] The present invention wears a marker at the knee joint or ankle joint, uses the marker as a reference for subsequent search, positioning and identification of characteristic points, draws a straight line through the characteristic points to form a measurement standard line, and uses the measurement standard line as a reference for ankle distance or knee distance. The characteristic points on the ankle joint and knee joint can be automatically identified, thereby improving the consistency of data when measuring knee distance and ankle distance, and avoiding errors caused by human factors.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for identifying ankle distance and knee distance, comprising the following steps:

[0009] S1: Wear a marker at the knee or ankle joint;

[0010] S2: Acquire an image containing a knee joint or an ankle joint as an image to be recognized;

[0011] S3: searching for a landmark at the knee joint or the ankle joint in the image to be identified, and marking the landmark to form an image to be measured;

[0012] S4: In the image to be measured, the intersection of the knee joint marker and the outer side of the knee joint or the intersection of the ankle joint marker and the outer side of the ankle joint is taken as a feature point, and a vertical line perpendicular to the height direction of the human body is drawn through the feature point as the measurement standard line;

[0013] Identify the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or knee distance.

[0014] It is further defined that the marker is a stepped structure comprising at least two steps, wherein the width of each step is y and the height is h.

[0015] It is further defined that in step S3, searching for a landmark at the knee joint or the ankle joint in the image to be identified specifically includes:

[0016] Set a search window, wherein the height of the search window is less than or equal to half the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified;

[0017] Use the search window to scan the pixels on one side of the marker in the image to be identified from bottom to top. When the horizontal coordinate values ​​of the pixels in the search window show a decreasing pattern of (n×y), ((n-1)×y), ((n-2)×y), ..., y, the position of the search window is the position of the marker at the knee joint or ankle joint, where n is the number of steps in the marker and y is the width of each step.

[0018] It is further defined that in step S4, taking the intersection of the marker at the knee joint and the outside of the knee joint or the intersection of the marker at the ankle joint and the outside of the ankle joint as the feature point is specifically: taking the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint or the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint as the feature point.

[0019] It is further defined that in step S2, obtaining an image containing the knee joint or ankle joint specifically includes: using an image scanning device to scan upward along the sole of the person to be tested until the lower limbs of the person to be tested are scanned, thereby generating an image containing the knee joint or ankle joint.

[0020] It is further defined that in step S4, identifying the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or the knee distance specifically includes:

[0021] Remove the pixel unit closest to the unobstructed area from the occluded area and use it as the unobstructed area; remove the pixel unit closest to the occluded area from the unobstructed area and use it as the occluded area;

[0022] Identify the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or knee distance.

[0023] It is further defined that in step S4, the calculation formula for the ankle distance or knee distance is:

[0024]

[0025] Where D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between the two obstructed areas on the measurement standard line, unit: piece; C is the unit value of the measuring instrument, unit: mm / piece; e is the thickness of the wearable connector, unit: mm, where the wearable connector refers to the connector used to wear the marker on the knee joint or ankle joint.

[0026] The present invention provides an ankle spacing and knee spacing recognition device based on the above-mentioned ankle spacing and knee spacing recognition method, comprising:

[0027] Image scanning equipment: used for acquiring an image containing a knee joint or an ankle joint as an image to be identified, wherein a marker is worn at the knee joint or the ankle joint;

[0028] Recognition module: used to find the landmarks at the knee joint or ankle joint in the image to be recognized, identify the landmarks, and form the image to be measured;

[0029] And the spacing recognition module: used to use the intersection of the knee joint marker and the outside of the knee joint or the intersection of the ankle joint marker and the outside of the ankle joint as the feature point in the image to be measured, and draw a vertical line perpendicular to the height direction of the human body through the feature point as the measurement standard line.

[0030] It is further defined that the identification module includes a search window module and a monitor,

[0031] The search window module is used to scan pixels on one side of the marker in the image to be identified from bottom to top, wherein the height of the search window is less than or equal to half the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified;

[0032] The monitor is used to monitor the scanning process of the search window. When the horizontal coordinate values ​​of the pixels in the search window are monitored to show a decreasing change pattern of (n×y), ((n-1)×y), ((n-2)×y), ..., y in sequence, the location of the search window is the location of the marker at the knee joint or ankle joint, and the marker is identified; wherein n is the number of steps in the marker, and y is the width of each step.

[0033] It is further defined that the image scanning device and the search window module are both raster devices.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. In the present invention, a marker is worn at the knee joint or ankle joint, and the marker is used as a reference for subsequent search, positioning, and identification of characteristic points. A straight line is drawn through the characteristic points to form a measurement standard line, and the measurement standard line is used as a reference for ankle distance or knee distance. The characteristic points on the ankle joint and knee joint can be automatically identified, thereby improving the consistency of data when measuring knee distance or ankle distance and avoiding errors caused by human factors.

[0036] 2. In the present invention, the marker is set as a stepped structure, which is convenient for cooperating with the search window to search for the marker, thereby improving the accuracy of marker search and further improving the search and positioning accuracy of feature points.

[0037] 3. In the present invention, the edges of the occluded area and the unoccluded area are processed. The pixel unit closest to the unoccluded area in the occluded area is removed as the unoccluded area; the pixel unit closest to the unoccluded area in the unoccluded area is removed as the occluded area. This allows the occluded area and the unoccluded area to have a clear distinguishing boundary, further improving the accuracy of the measured ankle distance or knee distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of a method for identifying ankle distance and knee distance according to the present invention;

[0039] Figure 2 is a schematic diagram of a device for identifying ankle distance and knee distance according to the present invention;

[0040] Figure 3 Schematic diagram of the structure of the marker;

[0041] Figure 4 is a schematic diagram of an image to be recognized;

[0042] Figure 5 This is a schematic diagram of the locations of the measurement standard line and feature points at the ankle joint;

[0043] Figure 6Schematic diagram of the locations of the measurement standard lines and feature points at the knee joint. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0045] See also Figure 1 The present invention proposes a method for identifying ankle distance and knee distance, comprising the following steps:

[0046] S1: Wear a marker at the knee or ankle; see Figure 3 The marker is a stepped structure comprising at least two steps, wherein each step has a width of y and a height of h. The marker is configured as a step to facilitate searching the marker with a search window, thereby improving the accuracy of marker recognition. The marker may have two, three, four, or even more layers. Preferably, in the present invention, the marker has two layers. The marker may be worn at the knee or ankle joint by tying or snapping. The connector for wearing the marker at the knee or ankle joint is a wearable connector, i.e., a tying strap or a snap-on connector. The wearable connector and the marker may be fixedly connected by gluing or snapping.

[0047] S2: See Figure 4 , obtain an image containing the knee joint or ankle joint as the image to be identified; obtaining the image containing the knee joint or ankle joint is specifically as follows: using an image scanning device to scan upward along the sole of the foot of the person to be tested until the lower limbs of the person to be tested are scanned, and an image containing the knee joint or ankle joint is generated, wherein the image scanning device is any device that can obtain an image, such as a camera, a grating device, a radar, etc. Preferably, the image scanning device is a grating device.

[0048] S3: searching for a landmark at the knee joint or the ankle joint in the image to be identified, and marking the landmark to form an image to be measured;

[0049] S4: In the image to be measured, see Figure 5 and Figure 6 , take the intersection of the marker at the knee joint and the outside of the knee joint or the intersection of the marker at the ankle joint and the outside of the ankle joint as the feature point, and draw a vertical line perpendicular to the height direction of the human body through the feature point as the measurement standard line; identify the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or knee distance.

[0050] In the present invention, in step S3, searching for a landmark at the knee joint or ankle joint in the image to be identified specifically includes:

[0051] A search window is set, wherein the height of the search window is less than or equal to half the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified. In the present invention, scanning is performed using a raster device, and the search window refers to a scanning window on the raster device. The search window is used to scan pixels on one side of the marker in the image to be identified from bottom to top. When the horizontal coordinate values ​​of the pixels within the search window show a decreasing pattern of (n×y), ((n-1)×y), ((n-2)×y), ..., y, the location of the search window is the location of the marker at the knee joint or ankle joint, and n is the number of steps in the marker. The corresponding vertical coordinate change between two adjacent horizontal coordinate values ​​is the height h of each step, that is, the corresponding vertical coordinate change between the horizontal coordinate value change of (n×y) and the horizontal coordinate value change of ((n-1)×y) is the height h of each step, and the corresponding vertical coordinate change between the horizontal coordinate value change of ((n-1)×y) and the horizontal coordinate value change of ((n-2)×y) is the height h of each step.

[0052] In the present invention, in step S4, taking the intersection of the marker at the knee joint and the outside of the knee joint as the feature point specifically means taking the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint as the feature point, that is, identifying the knee distance through the feature points on the knee joint, and determining the development of the leg shape based on the knee distance.

[0053] In the present invention, in step S4, taking the intersection of the marker at the ankle joint and the outside of the ankle joint as a feature point is specifically: taking the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint as a feature point, that is, identifying the ankle distance through the feature points on the ankle joint, and determining the development of the leg shape based on the ankle distance.

[0054] In the present invention, in step S4, the intersection of the marker at the knee joint and the outside of the knee joint and the intersection of the marker at the ankle joint and the outside of the ankle joint are used as feature points. Specifically, the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint and the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint are used as feature points. That is, the knee distance is identified by the feature points on the knee joint, and the ankle distance is identified by the feature points on the ankle joint. The development of the leg shape is determined based on the ankle distance and the knee distance.

[0055] Preferably, in step S4, identifying the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or the knee distance specifically includes:

[0056] The nearest pixel unit from the occluded area to the unobstructed area is removed as the unobstructed area. The nearest pixel unit from the unobstructed area to the occluded area is removed as the occluded area, thereby clearly distinguishing the occluded and unobstructed areas and improving the recognition accuracy of the measurement standard line. The length of the unobstructed area between the two occluded areas on the measurement standard line is identified as the ankle distance or knee distance. The two occluded areas are formed by scanning the two lower limbs of the human body, and the blank area between the two occluded areas refers to the distance between the two lower limbs of the human body.

[0057] The calculation formula for ankle distance or knee distance is:

[0058]

[0059] Wherein, D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between the two obstructed areas on the measurement standard line, unit: piece; C is the unit value of the measuring instrument, unit: mm / piece; e is the thickness of the wearable connector, unit: mm, where the wearable connector refers to the connector used to wear the marker on the knee joint or ankle joint; the thickness of the wearable connector refers to the total thickness. If the wearable connector is included on both sides of one lower limb of the person to be measured, the thickness of the wearable connector refers to the total thickness of the two sides of the lower limb; if the wearable connector is included on one side of one lower limb of the person to be measured, the thickness of the wearable connector refers to the thickness of one side of the lower limb.

[0060] The present invention provides a method for identifying ankle spacing and knee spacing. The method comprises wearing a marker at the knee joint or ankle joint, using the marker as a reference for subsequent searching, locating, and identifying characteristic points, drawing a straight line through the characteristic points to form a measurement standard line, and using the measurement standard line as a reference for the ankle spacing or knee spacing. The method can automatically identify the characteristic points on the ankle joint and knee joint, improve the consistency of data when measuring the knee spacing and ankle spacing, and avoid errors caused by human factors.

[0061] When acquiring the image to be identified in the present invention, the person to be measured stands barefoot on the collection table, and the feet and knees of the person to be measured are observed. Because the standing postures are different when measuring O-shaped legs and X-shaped legs, the person to be measured has three standing postures: if both knees and feet can be close together, the person to be measured stands naturally with both knees and feet close together; if both feet are close together but the middle of the knee joints cannot be close together, the person to be measured stands naturally after the feet are close together; if the knee joints are close together but the middle of the feet cannot be close together, the person to be measured stands naturally after the knee joints are close together.

[0062] Take the example of a marker with 2 steps, where the width of each step is 10 mm, that is, the total step width is 20 mm; the height of each step is 6 mm, that is, the total step height is 12 mm.

[0063] The search window is set based on Shannon's sampling theorem. The height of the search window is less than or equal to half of the sum of the heights of all steps. For example, if the height of each step is 6 mm and there are two steps in total, the height of the search window is less than or equal to half of the sum of the heights of all steps, that is, less than or equal to 6 mm. The width of the search window is not less than the maximum width of the occluded area in the image to be identified.

[0064] According to the method of the above step S3, the pixels on the side of the marker set in the image to be identified are scanned from bottom to top. Taking the width of each step as 10 mm and a total of 2 steps as an example, when the horizontal coordinate values ​​of the pixels in the search window are monitored to show a decreasing pattern of 20 mm and 10 mm respectively, the position of the search window at this time is the position of the marker at the knee joint or the ankle joint.

[0065] The knee distance or ankle distance is calculated according to the process of step S4 above, wherein the measurement unit of the grating device is 2.5 mm / piece.

[0066] See also Figure 2 The present invention further proposes an ankle spacing and knee spacing recognition device based on the above ankle spacing and knee spacing recognition method, comprising:

[0067] Image scanning device: used to obtain an image containing a knee joint or ankle joint as an image to be identified, wherein a marker is worn at the knee joint or ankle joint; for details, see Figure 3 The marker is a stepped structure comprising at least two steps, wherein the width of each step is y and the height is h. The marker is set to be stepped in order to cooperate with the search window to search for the marker, thereby improving the recognition accuracy of the marker. The marker can be two-layered, three-layered, four-layered or even more-layered. Preferably, in the present invention, the number of layers of the marker is 2. The marker can be worn at the knee joint or ankle joint by tying or snapping. Acquiring an image containing the knee joint or ankle joint is specifically as follows: using an image scanning device to scan upward along the sole of the person to be tested until the lower limbs of the person to be tested are scanned, and an image containing the knee joint or ankle joint is generated, wherein the image scanning device is any device that can acquire an image, such as a camera, a grating device, a radar, etc. Preferably, the image scanning device is a grating device.

[0068] Recognition module: used to find the landmarks at the knee joint or ankle joint in the image to be recognized, identify the landmarks, and form the image to be measured;

[0069] And the spacing recognition module: used in the image to be measured, see Figure 5 and Figure 6 The intersection of the knee joint marker and the outside of the knee joint or the intersection of the ankle joint marker and the outside of the ankle joint is taken as the feature point, and a vertical line perpendicular to the height direction of the human body is drawn through the feature point as the measurement standard line.

[0070] In the present invention, the recognition module includes a search window module and a monitor, wherein the search window module is used to scan the pixels on one side of the marker set in the image to be identified from bottom to top, wherein the height of the search window is less than or equal to half of the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified; the monitor is used to monitor the scanning process of the search window, when it is monitored that the horizontal coordinate values ​​of the pixels in the search window show a decreasing change pattern of (n×y), ((n-1)×y), ((n-2)×y),..., y in sequence, the position of the search window is the position of the marker at the knee joint or the ankle joint, and the marker is identified; n is the number of steps in the marker, and y is the width of each step. Among them, the corresponding vertical coordinate change between two adjacent horizontal coordinate values ​​is the height h of each step, that is, the corresponding vertical coordinate change between the horizontal coordinate value change of (n×y) and the horizontal coordinate value change of ((n-1)×y) is the height h of each step, and the corresponding vertical coordinate change between the horizontal coordinate value change of ((n-1)×y) and the horizontal coordinate value change of ((n-2)×y) is the height h of each step.

[0071] Taking the case where the width of each step is 10 mm and there are two steps in total as an example, when the horizontal coordinate values ​​of the pixels in the search window are monitored to show a decreasing pattern of 20 mm and 10 mm respectively, the location of the search window is the location of the landmark at the knee joint or ankle joint.

[0072] In the present invention, taking the intersection of the marker at the knee joint and the outside of the knee joint as the feature point specifically means: taking the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint as the feature point, that is, identifying the knee distance through the feature points on the knee joint, and determining the development of the leg shape based on the knee distance.

[0073] In the present invention, taking the intersection of the marker at the ankle joint and the outside of the ankle joint as the feature point specifically means: taking the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint as the feature point, that is, identifying the ankle distance through the feature points on the ankle joint, and determining the development of the leg shape based on the ankle distance.

[0074] In the present invention, the intersection of the marker at the knee joint and the outside of the knee joint and the intersection of the marker at the ankle joint and the outside of the ankle joint are used as feature points. Specifically, the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint and the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint are used as feature points. That is, the knee distance is identified by the feature points on the knee joint, and the ankle distance is identified by the feature points on the ankle joint, and the development of the leg shape is determined based on the ankle distance and the knee distance.

[0075] Preferably, identifying the length of the unobstructed area between two obstructed areas on the measurement standard line as the ankle distance or the knee distance specifically includes:

[0076] The pixel unit closest to the unobstructed area in the occluded area is removed as the unobstructed area; the pixel unit closest to the unobstructed area in the unobstructed area is removed as the occluded area, thereby clearly distinguishing the occluded area from the unobstructed area and improving the recognition accuracy of the measurement standard line; the length of the unobstructed area between the two occluded areas on the measurement standard line is identified as the ankle distance or knee distance.

[0077] The calculation formula for ankle distance or knee distance is:

[0078]

[0079] Where D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between the two obstructed areas on the measurement standard line, unit: piece; C is the unit value of the measuring instrument, unit: mm / piece; e is the thickness of the wearable connector, unit: mm, where the wearable connector refers to the connector used to wear the marker on the knee joint or ankle joint.

[0080] In the present invention, the ankle distance, the knee distance, or both the ankle distance and the knee distance can be measured separately, and the development of the knee joint can be judged by the ankle distance or the knee distance.

[0081] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A method for identifying ankle distance and knee distance, characterized in that: The following steps are involved: S1: Wear a marker at the knee or ankle joint; S2: Acquire an image containing a knee joint or an ankle joint as an image to be recognized; S3: searching for a landmark at the knee joint or the ankle joint in the image to be identified, and marking the landmark to form an image to be measured; the landmark is a stepped structure comprising at least two steps, wherein each step has a width y and a height h; Searching for a landmark at the knee joint or the ankle joint in the image to be identified includes: scanning pixels on one side of the landmark in the image to be identified from bottom to top using a search window, and when the change in the corresponding vertical coordinate between two adjacent horizontal coordinate values ​​is equal to the height h of each step, the position of the search window is the position of the landmark at the knee joint or the ankle joint; S4: In the image to be measured, the intersection of the knee joint marker and the outer side of the knee joint or the intersection of the ankle joint marker and the outer side of the ankle joint is taken as a feature point, and a vertical line perpendicular to the height direction of the human body is drawn through the feature point as the measurement standard line; Identify the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or knee distance.

2. The method for identifying ankle distance and knee distance according to claim 1, characterized in that: In step S3, searching for a landmark at the knee joint or ankle joint in the image to be identified specifically includes: Set a search window, wherein the height of the search window is less than or equal to half the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified; Use the search window to scan the pixels on one side of the marker in the image to be identified from bottom to top. When the horizontal coordinate values ​​of the pixels in the search window show a decreasing pattern of (n×y), ((n-1)×y), ((n-2)×y), ..., y, the position of the search window is the position of the marker at the knee joint or ankle joint, where n is the number of steps in the marker and y is the width of each step.

3. The method for identifying ankle distance and knee distance according to claim 1, characterized in that: In step S4, the intersection of the marker at the knee joint and the outside of the knee joint or the intersection of the marker at the ankle joint and the outside of the ankle joint is taken as a feature point, specifically: the intersection of the bottom end surface of the marker at the knee joint and the outside of the knee joint or the intersection of the bottom end surface of the marker at the ankle joint and the outside of the ankle joint is taken as a feature point.

4. The method for identifying ankle distance and knee distance according to claim 1, characterized in that: In step S2, obtaining an image including the knee joint or ankle joint specifically includes: using an image scanning device to scan upward along the sole of the person to be tested until the lower limbs of the person to be tested are scanned, thereby generating an image including the knee joint or ankle joint.

5. The method for identifying ankle distance and knee distance according to claim 1, characterized in that: In step S4, identifying the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or the knee distance specifically includes: Remove the pixel unit closest to the unobstructed area from the occluded area and use it as the unobstructed area; remove the pixel unit closest to the occluded area from the unobstructed area and use it as the occluded area; Identify the length of the unobstructed area between the two obstructed areas on the measurement standard line as the ankle distance or knee distance.

6. The method for identifying ankle distance and knee distance according to claim 5, characterized in that: In step S4, the calculation formula for the ankle distance or knee distance is: Where D is the ankle distance or knee distance, unit: mm; B is the number of measurement units in the unobstructed area between the two obstructed areas on the measurement standard line, unit: piece; C is the unit value of the measuring tool, unit: mm / piece; e is the thickness of the wearable connector, unit: mm, where the wearable connector refers to the connector used to wear the marker on the knee joint or ankle joint.

7. A device for identifying ankle distance and knee distance formed based on the method for identifying ankle distance and knee distance according to claim 1, characterized in that: include: Image scanning equipment: used for acquiring an image containing a knee joint or an ankle joint as an image to be identified, wherein a marker is worn at the knee joint or the ankle joint; Recognition module: used to find the landmarks at the knee joint or ankle joint in the image to be recognized, identify the landmarks, and form the image to be measured; And the spacing recognition module: used to use the intersection of the knee joint marker and the outside of the knee joint or the intersection of the ankle joint marker and the outside of the ankle joint as the feature point in the image to be measured, and draw a vertical line perpendicular to the height direction of the human body through the feature point as the measurement standard line.

8. The device for identifying ankle distance and knee distance according to claim 7, characterized in that: The identification module includes a search window module and a monitor, The search window module is used to scan pixels on one side of the marker in the image to be identified from bottom to top, wherein the height of the search window is less than or equal to half the sum of the heights of all steps, and the width of the search window is not less than the maximum width of the occluded area in the image to be identified; The monitor is used to monitor the scanning process of the search window. When the horizontal coordinate values ​​of the pixels in the search window are monitored to show a decreasing change pattern of (n×y), ((n-1)×y), ((n-2)×y), ..., y in sequence, the location of the search window is the location of the marker at the knee joint or ankle joint, and the marker is identified; wherein n is the number of steps in the marker, and y is the width of each step.

9. The device for identifying ankle distance and knee distance according to claim 8, characterized in that: The image scanning device and the search window module are both raster devices.

Images