Ankle spacing and knee spacing identification method and identification device

Abstract

The invention provides an ankle spacing and knee spacing identification method and device, and belongs to the technical field of medical auxiliary equipment, and the method comprises the steps: S1, wearing a marker at a knee joint or an ankle joint; s2, acquiring an image containing a knee joint or an ankle joint as an image to be recognized; s3, searching markers at knee joints or ankle joints in the to-be-identified image, and marking the markers to form a to-be-measured image; s4, in the to-be-measured image, the intersection point of the marker at the knee joint and the outer side of the knee joint or the intersection point of the marker at the ankle joint and the outer side of the ankle joint serves as a feature point, and a vertical line perpendicular to the height direction of the human body is drawn through the feature point and serves as a measurement standard line; and identifying the length of a non-sheltered area between the two sheltered areas on the measurement standard line as the ankle spacing or the knee spacing. According to the invention, the feature points on the ankle joint and the knee joint can be automatically identified, and the consistency of data during knee spacing and ankle spacing measurement is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical auxiliary devices, and relates to a method and a device for identifying ankle distance and knee distance. 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 knee joint dysplasia phenomena clinically. Among them, knee varus is also known as O-shaped legs; knee valgus is also known as X-shaped legs. For the angular development of the knee joint (knee varus or knee valgus), in mild cases, it only affects the appearance of the lower limbs of the human body, and there is no obvious pain or limited movement; in severe cases, the knee joint is severely deformed, the flexion and extension of the knee joint are limited, and it may eventually evolve into osteoarthritis, seriously affecting the normal life of patients.

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

[0004] In the prior art, the measurement of knee distance or ankle distance is generally carried out by manual measurement. During the manual measurement process, affected by factors such as inaccurate positioning of the characteristic points of the two ankles or two knees and errors in manual data reading, there is a technical problem of large measurement error in the measurement results. Summary of the Invention

[0005] In view of the technical problem described in the above background art that the existing manual measurement of knee distance or ankle distance 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 measurement errors, the present invention proposes a method and a device for identifying ankle distance and knee distance.

[0006] The present invention wears markers at the knee joint or the ankle joint, uses the markers as the reference for subsequent searching, positioning and identifying characteristic points, makes a straight line through the characteristic points to form a measurement standard line, and uses the measurement standard line as the reference for ankle distance or knee distance, which can automatically identify the characteristic points on the ankle joint and the knee joint, improve the consistency of data during the measurement of knee distance and ankle distance, and avoid errors caused by the influence of human factors.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: An identification method for ankle distance and knee distance of the present invention includes the following steps: S1: Wear markers at the knee joint or ankle joint; S2: Obtain an image containing the knee joint or ankle joint as the image to be identified; S3: Search for the markers at the knee joint or ankle joint in the image to be identified, and mark the markers to form an image to be measured; S4: In the image to be measured, take the intersection point of the marker at the knee joint and the outside of the knee joint or the intersection point of the marker at the ankle joint and the outside of the ankle joint as the feature point, and draw a perpendicular line perpendicular to the direction of the human body height 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.

[0008] Further defined, the marker is a stepped structure including at least two layers of steps, wherein the width of each layer of step is y and the height is h.

[0009] Further defined, in step S3, searching for the markers 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 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 obstructed 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 abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time 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 layer of step.

[0010] Further defined, in step S4, taking the intersection point of the marker at the knee joint and the outside of the knee joint or the intersection point of the marker at the ankle joint and the outside of the ankle joint as the feature point specifically means: taking the intersection point of the bottom end face of the marker at the knee joint and the outside of the knee joint or the intersection point of the bottom end face of the marker at the ankle joint and the outside of the ankle joint as the feature point.

[0011] Further defined, 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 measured until the lower limb of the person to be measured is scanned completely to generate an image containing the knee joint or ankle joint.

[0012] Further defined, 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 knee distance specifically includes: Remove the pixel unit closest to the unobstructed area in the occluded area as the unobstructed area; remove the pixel unit closest to the occluded area in the unobstructed area as the occluded area. Identify the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle spacing or knee spacing.

[0013] Further defined, in the step S4, the calculation formula for the ankle spacing or knee spacing is: In the formula, D is the ankle spacing or knee spacing, unit: mm; B is the number of measurement units of the unobstructed area between two occluded 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 connecting piece, unit: mm, where the wearable connecting piece refers to the connecting piece used to wear the marker on the knee joint or ankle joint.

[0014] An ankle spacing and knee spacing recognition device formed by the ankle spacing and knee spacing recognition method based on the above, includes: Image scanning device: used to obtain an image containing the knee joint or ankle joint as the image to be recognized, where a marker is worn at the knee joint or ankle joint; Recognition module: used to find the marker at the knee joint or ankle joint in the image to be recognized and mark the marker to form an image to be measured; And spacing recognition module: used to use the intersection point of the knee joint marker and the outside of the knee joint or the intersection point 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 perpendicular line perpendicular to the human body height direction through the feature point as the measurement standard line.

[0015] Further defined, the recognition module includes a search window module and a monitor, The search window module is used to scan the pixels on one side of the marker in the image to be recognized from bottom to top. Among them, the height of the search window is less than or equal to half of the sum of all step heights, and the width of the search window is not less than the maximum width of the occluded area in the image to be recognized; The monitor is used to monitor the scanning process of the search window. When it is monitored that the abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time is the position of the marker at the knee joint or ankle joint, and the marker is marked; where n is the number of steps in the marker, and y is the width of each step.

[0016] Further defined, both the image scanning device and the search window module are raster devices.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, markers are worn at the knee joint or the ankle joint. The markers are used as the benchmark for subsequent searching, positioning, and identifying feature points. A straight line is drawn through the feature points to form a measurement standard line, and the measurement standard line is used as the benchmark for ankle distance or knee distance. It can automatically identify the feature points on the ankle joint and the knee joint, improve the consistency of data during the measurement of ankle distance or knee distance, and avoid errors caused by human factors.

[0018] 2. In the present invention, the marker is set as a stepped structure, which is convenient for cooperating with the searching window to search for the marker, improves the accuracy of marker searching, and further improves the searching and positioning accuracy of feature points.

[0019] 3. In the present invention, the edges of the occluded area and the non-occluded area are processed. The pixel unit closest to the non-occluded area in the occluded area is removed as the non-occluded area; the pixel unit closest to the occluded area in the non-occluded area is removed as the occluded area; so that the occluded area and the non-occluded area can have an obvious distinguishing boundary, and further improves the accuracy of the measured ankle distance or knee distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the method for identifying ankle distance and knee distance of the present invention; Figure 2 It is a schematic diagram of the device for identifying ankle distance and knee distance of the present invention; Figure 3 It is a schematic diagram of the structure of the marker; Figure 4 It is a schematic diagram of the image to be identified; Figure 5 It is a schematic diagram of the position of the measurement standard line and the feature points at the ankle joint; Figure 6 It is a schematic diagram of the position of the measurement standard line and the feature points at the knee joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The technical solution of the present invention will be further explained below in conjunction with the drawings and embodiments, but the present invention is not limited to the following embodiments.

[0022] Refer to Figure 1 , the present invention proposes a method for identifying ankle distance and knee distance, including the following steps: S1: Wear markers at the knee joint or the ankle joint; specifically, refer to Figure 3, the marker is a stepped structure including at least two layers of steps. Wherein, the width of each step is y and the height is h. The reason for setting the marker as a stepped shape is to cooperate with the search window to search for the marker, which improves the recognition accuracy of the marker. The marker can be two layers, three layers, four layers or even more layers. Preferably, in the present invention, the number of layers of the marker is two layers. The marker can be worn at the knee joint or the ankle joint by means of binding or clamping. The connecting member for wearing the marker at the knee joint or the ankle joint is a wearing connecting member, that is, the wearing connecting member is a binding band for binding or a clamping member for clamping. The wearing connecting member and the marker can be fixedly connected by means of gluing or clamping.

[0023] S2: Refer to Figure 4 , obtain an image including the knee joint or the ankle joint as the image to be recognized; specifically, obtaining an image including the knee joint or the ankle joint is: using an image scanning device to scan upward along the sole of the person to be measured until the lower limb of the person to be measured is scanned completely, generating an image including the knee joint or the ankle joint. Among them, the image scanning device is any device that can obtain images such as a camera, a grating device, a radar, etc. Preferably, the image scanning device is a grating device.

[0024] S3: Search for the marker at the knee joint or the ankle joint in the image to be recognized and mark the marker to form an image to be measured; S4: In the image to be measured, refer to Figure 5 and Figure 6 , take the intersection point of the marker at the knee joint and the outside of the knee joint or the intersection point of the marker at the ankle joint and the outside of the ankle joint as the feature point, and draw a perpendicular line perpendicular to the direction of the human body height through the feature point as the measurement standard line; identify the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or the knee distance.

[0025] In the present invention, in step S3, searching for the marker at the knee joint or the ankle joint in the image to be recognized specifically includes: Set a search window. Among them, 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 recognized; in the present invention, it is scanned by a grating device, and the search window refers to the scanning window on the grating device; use the search window to scan the pixels on one side of the set marker in the image to be recognized from bottom to top. When the abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time is the position of the marker at the knee joint or the ankle joint, where n is the number of steps in the marker. Among them, the vertical coordinate change corresponding to the two adjacent abscissa values is the height h of each step, that is, the vertical coordinate change corresponding to the abscissa value change from (n×y) to the abscissa value change from ((n - 1)×y) is the height h of each step, and the vertical coordinate change corresponding to the abscissa value change from ((n - 1)×y) to the abscissa value change from ((n - 2)×y) is the height h of each step.

[0026] In the present invention, in step S4, taking the intersection point of the marker at the knee joint and the outside of the knee joint as the feature point specifically means: taking the intersection point of the bottom end face of the marker at the knee joint and the outside of the knee joint as the feature point, that is, recognizing the knee joint space through the feature point on the knee joint, and determining the development of the leg shape according to the knee joint space.

[0027] In the present invention, in step S4, taking the intersection point of the marker at the ankle joint and the outside of the ankle joint as the feature point specifically means: taking the intersection point of the bottom end face of the marker at the ankle joint and the outside of the ankle joint as the feature point, that is, recognizing the ankle joint space through the feature point on the ankle joint, and determining the development of the leg shape according to the ankle joint space.

[0028] In the present invention, in step S4, taking the intersection point of the marker at the knee joint and the outside of the knee joint and the intersection point of the marker at the ankle joint and the outside of the ankle joint as the feature points specifically means: taking the intersection point of the bottom end face of the marker at the knee joint and the outside of the knee joint and the intersection point of the bottom end face of the marker at the ankle joint and the outside of the ankle joint as the feature points, that is, recognizing the knee joint space through the feature point on the knee joint, recognizing the ankle joint space through the feature point on the ankle joint, and jointly determining the development of the leg shape according to the ankle joint space and the knee joint space.

[0029] Preferably, in step S4, recognizing the length of the unoccluded area between the two occluded areas on the measurement standard line as the ankle joint space or the knee joint space specifically includes: Remove the pixel unit closest to the unobstructed area in the occluded area as the unobstructed area; remove the pixel unit closest to the occluded area in the unobstructed area as the occluded area, so as to clearly distinguish the occluded area and the unobstructed area and improve the recognition accuracy of the measurement standard line; identify the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or knee distance. The two occluded areas are respectively 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.

[0030] Among them, the calculation formula for the ankle distance or knee distance is: In the formula, D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between two occluded 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 connecting piece, unit: mm, where the wearable connecting piece refers to the connecting piece used to wear the marker on the knee joint or ankle joint; the thickness of the wearable connecting piece refers to the total thickness. If both sides of one lower limb of the person to be measured contain wearable connecting pieces, the thickness of the wearable connecting piece refers to the total thickness of both sides of the lower limb; if one side of one lower limb of the person to be measured contains a wearable connecting piece, the thickness of the wearable connecting piece refers to the thickness of one side of the lower limb.

[0031] A method for identifying ankle distance and knee distance according to the present invention wears markers at the knee joint or ankle joint, uses the markers as the benchmark for subsequent searching, positioning and identifying feature points, makes a straight line through the feature points to form a measurement standard line, and uses the measurement standard line as the benchmark for ankle distance or knee distance, which can automatically identify the feature points on the ankle joint and knee joint, improve the consistency of data during the measurement of knee distance and ankle distance, and avoid errors caused by human factors.

[0032] When the image to be recognized in the present invention is acquired, the person to be measured stands barefoot on the acquisition table, observing the feet and knees of the person to be measured. Because the standing postures are different when measuring O-shaped legs and X-shaped legs, there are three standing postures for the person to be measured: if both knees and feet can be close together, then stand naturally with both knees and feet close together; if the feet are close together but the knees cannot be close together, then stand naturally after the feet are close together; if the knees are close together but the feet cannot be close together, then stand naturally after the knees are close together.

[0033] Taking the number of steps of the marker as 2 layers as an example for illustration, 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.

[0034] Set a search window based on the Shannon sampling theorem. The height of the search window is less than or equal to half of the sum of the heights of all steps. Taking the height of each step as 6 mm and there are 2 steps in total as an example, 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 recognized.

[0035] Scan the pixels on one side of the marker set in the image to be recognized from bottom to top according to the method in step S3 above. Taking the width of each step as 10 mm and there are 2 steps in total as an example, when it is monitored that the abscissa values of the pixels in the search window show a decreasing change rule of 20 mm and 10 mm in sequence, the position where the search window is located at this time is the position of the marker at the knee joint or ankle joint.

[0036] Calculate the knee distance or ankle distance according to the process in step S4 above, where the measurement unit of the grating device is 2.5 mm / pixel.

[0037] See Figure 2 , the present invention also proposes an identification device for ankle distance and knee distance formed based on the above-mentioned identification method of ankle distance and knee distance, including: Image scanning device: used to obtain an image containing the knee joint or ankle joint as the image to be recognized, where a marker is worn at the knee joint or ankle joint; specifically, see Figure 3 , the marker is a stepped structure including at least two steps, where the width of each step is y and the height is h. The reason for setting the marker as a stepped shape is to cooperate with the search window to search for the marker, improving the recognition accuracy of the marker. The marker can be two layers, three layers, four layers or even more layers. 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 clamping. Obtaining an image containing the knee joint or ankle joint specifically is: using the image scanning device to scan upward along the sole of the person to be measured until the lower limb of the person to be measured is scanned completely, generating an image containing the knee joint or ankle joint, where 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.

[0038] Identification module: used to search for the marker at the knee joint or ankle joint in the image to be recognized and mark the marker to form an image to be measured; And a distance identification module: used to, in the image to be measured, see Figure 5 and Figure 6 , take 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, and draw a perpendicular line perpendicular to the direction of the human body height through the feature point as the measurement standard line.

[0039] In the present invention, the recognition module includes a search window module and a monitor. The search window module is used to scan the pixels on one side of the set marker in the image to be recognized from bottom to top. 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 occlusion area in the image to be recognized. The monitor is used to monitor the scanning process of the search window. When it is detected that the abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time is the position of the marker at the knee joint or the ankle joint, and the marker is identified. Here, n is the number of steps in the marker, and y is the width of each step. The corresponding ordinate change between two adjacent abscissa values that change is the height h of each step, that is, the ordinate change between the abscissa value change of (n×y) and the abscissa value change of ((n - 1)×y) is the height h of each step, and the ordinate change between the abscissa value change of ((n - 1)×y) and the abscissa value change of ((n - 2)×y) is the height h of each step.

[0040] Taking the width of each step as 10 mm and there are 2 steps as an example, when it is detected that the abscissa values of the pixels in the search window show a decreasing change rule of 20 mm and 10 mm in sequence, the position of the search window at this time is the position of the marker at the knee joint or the ankle joint.

[0041] In the present invention, taking the intersection point of the marker at the knee joint and the outer side of the knee joint as the feature point specifically means: taking the intersection point of the bottom end face of the marker at the knee joint and the outer side of the knee joint as the feature point, that is, identifying the knee space through the feature point on the knee joint, and determining the development of the leg shape according to the knee space.

[0042] In the present invention, taking the intersection point of the marker at the ankle joint and the outer side of the ankle joint as the feature point specifically means: taking the intersection point of the bottom end face of the marker at the ankle joint and the outer side of the ankle joint as the feature point, that is, identifying the ankle space through the feature point on the ankle joint, and determining the development of the leg shape according to the ankle space.

[0043] In the present invention, taking the intersection point of the marker at the knee joint and the outer side of the knee joint and the intersection point of the marker at the ankle joint and the outer side of the ankle joint as the feature points specifically means: taking both the intersection point of the bottom end face of the marker at the knee joint and the outer side of the knee joint and the intersection point of the bottom end face of the marker at the ankle joint and the outer side of the ankle joint as the feature points, that is, identifying the knee space through the feature point on the knee joint, identifying the ankle space through the feature point on the ankle joint, and jointly determining the development of the leg shape according to the ankle space and the knee space.

[0044] Preferably, identifying the length of the non-occluded area between two occluded areas on the recognition measurement standard line as the ankle space or the knee space specifically includes: Remove the pixel unit closest to the unobstructed area in the occluded area as the unobstructed area; remove the pixel unit closest to the occluded area in the unobstructed area as the occluded area, so as to clearly distinguish the occluded area and the unobstructed area and improve the recognition accuracy of the measurement standard line; recognize the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle spacing or knee spacing.

[0045] Among them, the calculation formula for the ankle spacing or knee spacing is: In the formula, D is the ankle spacing or knee spacing, unit: mm; B is the number of measurement units of the unobstructed area between two occluded 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.

[0046] In the present invention, the ankle spacing can be measured alone, the knee spacing can be measured alone, or the ankle spacing and knee spacing can be measured simultaneously, and the development of the knee joint can be judged by the ankle spacing or knee spacing.

[0047] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 It includes the following steps: S1: Wear a marker at the knee joint or ankle joint; S2: Obtain an image containing the knee joint or ankle joint as the image to be recognized; S3: Search for the marker at the knee joint or ankle joint in the image to be recognized, and identify the marker to form an image to be measured; S4: In the image to be measured, 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 perpendicular line perpendicular to the direction of the human body height through the feature point as the measurement standard line; Identify the length of the unobstructed area between two occluded 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, The marker is a stepped structure including at least two layers of steps, where the width of each step is y and the height is h.

3. The method for identifying ankle distance and knee distance according to claim 2, wherein In step S3, searching for the marker at the knee joint or ankle joint in the image to be recognized specifically includes: Set a search window, where 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 recognized; Use the search window to scan the pixels on one side of the marker in the image to be recognized from bottom to top. When the abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time 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.

4. The method for identifying ankle distance and knee distance according to claim 1, characterized in 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 specifically means: taking the intersection of the bottom end face of the marker at the knee joint and the outside of the knee joint or the intersection of the bottom end face of the marker at the ankle joint and the outside of the ankle joint as the feature point.

5. The method for identifying ankle distance and knee distance according to claim 1, characterized in 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 measured until the lower limb of the person to be measured is scanned completely to generate an image containing the knee joint or ankle joint.

6. 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 two occluded areas on the measurement standard line as the ankle distance or knee distance specifically includes: Remove the pixel unit closest to the unobstructed area in the occluded area as the unobstructed area; remove the pixel unit closest to the occluded area in the unobstructed area as the occluded area; Identify the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or knee distance.

7. The method for identifying ankle distance and knee distance according to claim 6, characterized in that, In step S4, the calculation formula for the ankle distance or knee distance is: In the formula, D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between two occluded 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 wearing connecting piece, unit: mm, where the wearing connecting piece refers to the connecting piece used to wear the marker on the knee joint or ankle joint.

8. An ankle distance and knee distance recognition device formed by the recognition method of ankle distance and knee distance according to claim 1, characterized in that, It includes: Image scanning device: Used to obtain an image containing the knee joint or ankle joint as the image to be recognized, where a marker is worn at the knee joint or ankle joint; Recognition module: used to find markers at the knee joint or ankle joint in the image to be recognized, and identify the markers to form an image to be measured; And spacing recognition module: used in the image to be measured, taking 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 feature points, and drawing a perpendicular line to the direction of the human body height through the feature points as the measurement standard line.

9. The ankle and knee distance recognition device according to claim 8, characterized in that, The recognition module includes a search window module and a monitor; The search window module is used to scan the pixels on one side of the marker in the image to be recognized from bottom to top. Among them, the height of the search window is less than or equal to half of the sum of all step heights, and the width of the search window is not less than the maximum width of the occlusion area in the image to be recognized; The monitor is used to monitor the scanning process of the search window. When it is monitored that the abscissa values of the pixels in the search window show a decreasing change rule of (n×y), ((n - 1)×y), ((n - 2)×y), …, y in sequence, the position of the search window at this time is the position of the marker at the knee joint or ankle joint, and the marker is identified; where n is the number of steps in the marker and y is the width of each step.

10. The ankle and knee distance recognition device according to claim 9, characterized in that, Both the image scanning device and the search window module are raster devices.

Images