Knee spacing and ankle spacing measuring system and method

Abstract

The invention provides a knee pitch and ankle pitch measuring system and method, and the method comprises the steps: carrying out the raster scanning of a knee joint and an ankle joint of a to-be-measured person through a knee pitch and ankle pitch measuring device, and obtaining a knee joint raster image and an ankle joint raster image; the markers are worn on knee joints and ankle joints of a person to be detected; an upper computer is electrically connected with a knee pitch and ankle pitch measuring device, a knee joint grating image and an ankle joint grating image are obtained, and the knee pitch and the ankle pitch are obtained based on the knee joint grating image and the ankle joint grating image. The knee pitch and ankle pitch measuring system provided by the invention solves the problems that in the prior art, when knee pitch and ankle pitch measurement is carried out, the knee pitch and ankle pitch of a person to be measured are generally directly measured manually by using tools such as a flexible rule, inaccurate positioning or shaking and the like often occur, the measurement result error is large, and the measurement accuracy is high. And the accuracy of the measurement result of the knee spacing is influenced.

Description

Technical Field

[0001] The invention belongs to the technical field of medical equipment, and in particular relates to a system and method for measuring knee distance and ankle distance. Background Art

[0002] The knee joint is the largest and most complex joint in the human body. The knee distance refers to the horizontal distance between the inner sides of the two knee joints when the test subject's legs are straight and close together. The ankle distance refers to the distance between the inner sides of the two ankles when the test subject's feet are close together. Depending on the difference in knee distance and ankle distance, there are different conditions such as normal development, knee varus and knee valgus. Among them, knee varus and knee valgus are common knee maldevelopment conditions, especially common in adolescents, which bring great inconvenience and physical and mental harm to people.

[0003] Knee spacing and ankle spacing are important indicators for judging the development of the knee joint. By measuring the knee spacing and ankle spacing, the development of the knee joint of the subject can be judged and corresponding treatment measures can be taken in time, which is of great significance to people's healthy life.

[0004] The existing method of measuring knee spacing and ankle spacing is generally manual measurement, using tools such as a tape measure to directly measure the knee spacing and ankle spacing of the subject. However, due to inaccurate positioning or shaking of the subject during the manual measurement process, large errors in the measurement results are caused, which affects the technical problem of the accuracy of the knee spacing measurement results. Summary of the invention

[0005] In order to solve the technical problem that the knee spacing and ankle spacing measurement method in the background technology is generally measured manually using tools such as a tape measure to measure the knee spacing and ankle spacing of a subject, but due to inaccurate positioning or shaking, etc., the manual measurement process often results in large errors in the measurement results, affecting the accuracy of the knee spacing measurement results, the present invention provides a system and method for measuring the knee spacing and ankle spacing.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a system for measuring knee spacing and ankle spacing, the system comprising: a host computer, a device for measuring knee spacing and ankle spacing, and a marker;

[0008] The knee-to-ankle distance measuring device is used to perform raster scanning on the knee joint and ankle joint of the subject to be measured, and obtain a knee joint raster image and an ankle joint raster image;

[0009] The markers are worn at the knee joints and ankle joints of the subject to be tested, and are used to determine the characteristic points of the knee joints and the characteristic points of the ankle joints;

[0010] The host computer is electrically connected to the measuring devices for knee distance and ankle distance, and is configured to obtain the grating images of the knee joint and the ankle joint, and based on the grating image of the knee joint and the feature points of the knee joint, as well as the grating image of the ankle joint and the feature points of the ankle joint, obtain the knee distance and the ankle distance.

[0011] Optionally, the measuring devices for knee distance and ankle distance include a base, a vertically moving component, and a grating device;

[0012] A standing surface is provided on the upper side of the base for the person to be measured to stand on during the measurement;

[0013] The vertically moving component is fixedly arranged on one side of the base;

[0014] The grating device is connected to the vertically moving component, and the vertically moving component drives the grating device to move up and down to scan the knee joint and the ankle joint of the person to be measured during the measurement, so as to obtain the grating images of the knee joint and the ankle joint of the person to be measured;

[0015] The grating device is electrically connected to the host computer;

[0016] The marker is a stepped structure including at least two layers of steps.

[0017] Optionally, the grating device includes a first cantilever, a second cantilever, a grating emission module, a grating reception module, and a cross beam;

[0018] The middle part of the cross beam is connected to the vertically moving component;

[0019] The first cantilever and the second cantilever are respectively fixedly arranged at both ends of the cross beam, and the first cantilever and the second cantilever are located on both sides above the standing surface;

[0020] The grating emission module is fixedly arranged on the first cantilever;

[0021] The grating reception module is fixedly arranged on the second cantilever and corresponds to the grating emission module;

[0022] The grating reception module is electrically connected to the host computer.

[0023] Optionally, the vertically moving component includes a driving module, a guiding module, a connecting module, and a main control circuit module;

[0024] The guiding module is vertically and fixedly arranged on one side of the base;

[0025] The connecting module is movably arranged on the guiding module, and the grating device is fixedly installed on the connecting module;

[0026] The main control circuit module is electrically connected to the drive module;

[0027] The drive module is fixedly arranged on the guiding module, and the drive module is connected to the connection module;

[0028] The main control circuit module is used to control the drive module, so that the connection module drives the grating device to move up and down.

[0029] Optionally, the up-and-down moving assembly further includes an upper optoelectronic switch and a lower optoelectronic switch;

[0030] A guiding rail is vertically arranged on the guiding module, and the connection module is movably arranged on the guiding rail;

[0031] The upper optoelectronic switch and the lower optoelectronic switch are arranged on the side of the guiding rail, and are both electrically connected to the main control circuit module;

[0032] The upper optoelectronic switch is higher than the lower optoelectronic switch.

[0033] Optionally, the drive module includes a driving member and a transmission lead screw;

[0034] The driving member is arranged at the upper end of the guiding module, and the driving member is electrically connected to the main control circuit module;

[0035] A cavity is arranged in the guiding module, the transmission lead screw is arranged in the cavity, and the upper end of the transmission lead screw is connected to the driving member;

[0036] Part of the connection module extends into the cavity, and is sleeved on the transmission lead screw through a threaded sleeve, and the threaded sleeve is connected to the grating device.

[0037] In a second aspect, the present invention provides a method for measuring knee distance and ankle distance, which is used for the knee distance and ankle distance measurement system described above, including:

[0038] S1: Let the person to be measured stand on the base facing or back to the grating emission module, and wear markers at the knee joint and ankle joint of the person to be measured;

[0039] S2: Start the up-and-down moving assembly, use the up-and-down moving assembly to drive the grating device to move up and down along the lower limb of the person to be measured, scan the knee joint and ankle joint of the person to be measured through the grating device, obtain a knee joint grating image and an ankle joint grating image, and transmit them to the upper computer as images to be recognized;

[0040] S3: The upper computer searches for the markers at the knee joint and ankle joint in the image to be recognized, and marks the markers to form an image to be measured;

[0041] S4: In the image to be measured, the upper computer uses the intersection points of the markers at the knee joint and the outer side of the knee joint, and the intersection points of the markers at the ankle joint and the outer side of the ankle joint as feature points, and draws a perpendicular line perpendicular to the human body height direction through the feature points as the measurement standard line;

[0042] S5: The upper computer identifies the length of the unobstructed area between two obstructed areas on the measurement standard line as the ankle distance or knee distance.

[0043] Optionally, in step S3, finding the markers at the knee joint and the ankle joint in the image to be identified specifically includes:

[0044] 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 obstructed area in the image to be identified;

[0045] 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 the ankle joint, where n is the number of steps in the marker and y is the width of each step.

[0046] Optionally, in step S4, using the intersection points of the marker at the knee joint and the outer side of the knee joint and the intersection points of the marker at the ankle joint and the outer side of the ankle joint as feature points specifically means: using the intersection points of the bottom end face of the marker at the knee joint and the outer side of the knee joint and the intersection points of the bottom end face of the marker at the ankle joint and the outer side of the ankle joint as feature points;

[0047] Identifying the length of the unobstructed area between two obstructed areas on the measurement standard line as the ankle distance or knee distance specifically includes:

[0048] Remove the pixel unit closest to the unobstructed area in the obstructed area as the unobstructed area; remove the pixel unit closest to the obstructed area in the unobstructed area as the obstructed area;

[0049] Identify the length of the unobstructed area between two obstructed areas on the measurement standard line as the ankle distance or knee distance.

[0050] Optionally, in step S4, the calculation formula for the ankle distance or knee distance is:

[0051] D = (B×C) - e

[0052] Wherein, D is the ankle distance or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between two obstructed areas on the measurement reference 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, wherein the wearable connecting piece refers to the connecting piece used to wear the marker on the knee joint and ankle joint.

[0053] The beneficial effects of the present invention are as follows:

[0054] The present invention provides a measurement system for knee distance and ankle distance, including a host computer, a measurement device for knee distance and ankle distance, and a marker; the measurement device for knee distance and ankle distance is used to perform raster scanning on the knee joint and ankle joint of the subject to obtain a knee joint raster image and an ankle joint raster image; the marker is worn on the knee joint and ankle joint of the subject to determine the characteristic points of the knee joint and the characteristic points of the ankle joint; the host computer is electrically connected to the measurement device for knee distance and ankle distance to obtain the knee joint raster image and the ankle joint raster image, and based on the knee joint raster image and the characteristic points of the knee joint and the ankle joint raster image and the characteristic points of the ankle joint, the knee distance and ankle distance are obtained. The measurement system for knee distance and ankle distance provided by the present invention solves the technical problem in the prior art that when measuring the knee distance and ankle distance, manual measurement is adopted, and tools such as a soft ruler are used to measure the knee distance and ankle distance of the subject, but in the manual measurement process, situations such as inaccurate positioning or shaking often occur, resulting in a large measurement error and affecting the accuracy of the measurement result of the knee distance.

[0055] At the same time, the present invention also provides a measurement method for knee distance and ankle distance. A marker is worn at the knee joint and ankle joint of the subject, and the marker is used as the reference for subsequent searching, positioning, and identifying the characteristic points. A straight line is drawn through the characteristic points to form a measurement reference line, and the measurement reference line is used as the reference for the ankle distance or knee distance. The characteristic points on the ankle joint and knee joint can be automatically identified, improving the consistency of the data during the measurement of the knee distance and ankle distance, and avoiding the error caused by the influence of human factors. Description of the Drawings

[0056] Figure 1 is a schematic diagram of the measurement device for knee distance and ankle distance in the present invention;

[0057] Figure 2 is a schematic diagram of the knee joint raster image and the ankle joint raster image in the present invention;

[0058] Figure 3 is an exploded view of the raster device in the present invention;

[0059] Figure 4 is a schematic diagram of the up and down moving component in the present invention;

[0060] Figure 5It is a specific schematic diagram of the up-and-down moving component in the present invention;

[0061] Figure 6 It is a schematic diagram of the guiding module in the present invention;

[0062] Figure 7 It is a cross-sectional view of the guiding module in the present invention;

[0063] Figure 8 It is a schematic diagram of the method for measuring knee distance and ankle distance in the present invention;

[0064] Figure 9 It is a structural schematic diagram of the marker in the present invention;

[0065] Figure 10 It is a schematic diagram of the positions of the measurement standard line and characteristic points at the knee joint in the present invention;

[0066] Figure 11 It is a schematic diagram of the positions of the measurement standard line and characteristic points at the ankle joint in the present invention.

[0067] Wherein: 1. Base; 11. Standing surface; 2. Up-and-down moving component; 21. Driving module; 211. Driving member; 212. Transmission lead screw; 22. Guiding module; 221. Guide rail; 222. Upper limit block; 223. Lower limit block; 23. Connection module; 24. Main control circuit module; 25. Upper photoelectric switch; 26. Lower photoelectric switch; 27. Drag chain; 3. Grating device; 31. First cantilever; 32. Second cantilever; 33. Grating emission module; 34. Grating receiving module; 35. Cross beam; 4. Side plate. Detailed implementation manners

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0070] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0071] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0072] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0073] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning, and thus cannot be construed as limiting the protection scope of the present invention.

[0074] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0075] The knee joint is the largest and most complex joint in the human body. The knee distance refers to the horizontal distance between the inner sides of the two knee joints when the legs are straight and close together. The ankle joint refers to the distance between the inner sides of the two ankles when the two feet are close together. Depending on the difference in knee distance and ankle distance, there are different conditions such as normal development, knee varus and knee valgus. Among them, knee varus and knee valgus are common knee maldevelopment conditions, especially common in adolescents.

[0076] Knee varus is also known as O-shaped legs; knee valgus is also known as X-shaped legs. In mild cases, knee varus or knee valgus only affects the appearance of the lower limbs without obvious pain or loss of mobility; in severe cases, the knee joint is severely deformed, the knee flexion and extension are limited, and may eventually develop into osteoarthritis, seriously affecting the patient's normal life, causing great inconvenience and physical and mental harm to people.

[0077] In the prior art, the main measurement indicators for knee joint development are knee spacing and ankle spacing, wherein a knee spacing or ankle spacing of less than or equal to 3 cm indicates mild knee dysplasia; a knee spacing or ankle spacing of greater than 3 cm and less than or equal to 10 cm indicates moderate knee dysplasia; and a knee spacing or ankle spacing of greater than 10 cm indicates severe knee dysplasia.

[0078] Therefore, measuring the knee spacing and ankle spacing to determine the development of the knee joint of the subject and taking corresponding treatment measures in time is of great significance to people's healthy life.

[0079] Embodiment 1

[0080] The present invention provides a system for measuring knee spacing and ankle spacing, which comprises: a host computer, a device for measuring knee spacing and ankle spacing, and a marker, which is used to determine the characteristic points of the knee joint and the characteristic points of the ankle joint; wherein the device for measuring knee spacing and ankle spacing is used to perform raster scanning on the knee joint and ankle joint of a subject to be tested, and obtain a knee joint raster image and an ankle joint raster image; the marker is worn on the knee joint and ankle joint of the subject to be tested; the host computer is electrically connected to the device for measuring knee spacing and ankle spacing, and is used to obtain a knee joint raster image and an ankle joint raster image, and obtain the knee spacing and ankle spacing based on the knee joint raster image and the characteristic points of the knee joint and the ankle joint raster image and the characteristic points of the ankle joint.

[0081] In this embodiment, a grating scanning is performed on the knee joint and ankle joint of the subject using a measuring device for knee distance and ankle distance to obtain a knee joint grating image and an ankle joint grating image; markers are worn at the knee joint and ankle joint of the subject; the upper computer is electrically connected to the measuring device for knee distance and ankle distance to obtain the knee joint grating image and the ankle joint grating image, and based on the knee joint grating image and the characteristic points of the knee joint and the ankle joint grating image and the characteristic points of the ankle joint, the knee distance and ankle distance are obtained. The measuring system for knee distance and ankle distance provided in the present invention solves the technical problem in the prior art that when measuring the knee distance and ankle distance, manual measurement is used, and tools such as a soft ruler are used to measure the knee distance and ankle distance of the subject. However, during the manual measurement process, problems such as inaccurate positioning or shaking often occur, resulting in a large measurement error and affecting the accuracy of the measurement result of the knee distance.

[0082] Optionally, referring to Figure 1 and Figure 2 , the measuring device for knee distance and ankle distance in the present invention includes a base 1, an up-and-down moving component 2, and a grating device 3; a standing surface 11 is provided on the upper side of the base 1 for the subject to stand on during measurement; the up-and-down moving component 2 is fixedly arranged on one side of the base 1; the grating device 3 is connected to the up-and-down moving component 2, and the up-and-down moving component 2 drives the grating device 3 to move up and down to scan the knee joint and ankle joint of the subject during measurement to obtain a knee joint grating image and an ankle joint grating image of the subject, and the grating device 3 is electrically connected to the upper computer; the knee joint grating image and the ankle joint grating image of the subject are used to judge and obtain the knee distance and ankle distance of the subject.

[0083] In this embodiment, a standing position is provided for the subject through the standing surface 11 on the base 1, and the up-and-down moving component 2 is used to drive the grating device 3 to move up and down, so as to scan the knee joint and ankle joint of the subject using the grating device 3 to obtain a knee joint grating image and an ankle joint grating image. By using the knee joint grating image and the ankle joint grating image, the knee distance and ankle distance of the subject are analyzed and obtained. In the measuring device for knee distance and ankle distance provided in the present invention, during use, the subject stands on the standing surface 11, and the knee joint grating image and the ankle joint grating image of the subject are obtained by scanning using the grating device 3. Therefore, the upper computer can directly analyze and obtain the knee distance and ankle distance of the subject according to the obtained grating images. Therefore, the measuring device for knee distance and ankle distance of the present invention solves the technical problem in the prior art that when measuring the knee distance and ankle distance, manual measurement is generally used, and problems such as inaccurate positioning or shaking often occur, resulting in a large measurement error and affecting the measurement results of the knee distance and ankle distance.

[0084] Optionally, referring to Figure 3, in the present invention, the grating device 3 includes a first cantilever 31, a second cantilever 32, a grating emission module 33, a grating reception module 34, and a cross beam 35; the middle of the cross beam 35 is connected to the vertical movement assembly 2; the first cantilever 31 and the second cantilever 32 are respectively fixedly arranged at both ends of the cross beam 35, and the first cantilever 31 and the second cantilever 32 are located on both sides above the standing surface 11; the grating emission module 33 is fixedly arranged on the first cantilever 31; the grating reception module 34 is fixedly arranged on the second cantilever 32, corresponding to the grating emission module 33, and is electrically connected to the host computer.

[0085] In this embodiment, the grating emission module 33 on the first cantilever 31 is used to emit a structured grating with a specific wavelength and pattern, such as parallel grating lines, grid gratings, or Moiré fringes. Through the projection of the grating pattern, the surface contour of the object to be measured is marked; the grating reception module 34 correspondingly arranged with the grating emission module 33 on the second cantilever 32 is used to capture the grating pattern reflected or blocked by the surfaces of the knee joint and ankle joint of the person to be measured, so as to obtain the knee joint grating image and the ankle joint grating image, and transmit the obtained knee joint grating image and ankle joint grating image to the host computer to determine the ankle distance and knee distance.

[0086] Furthermore, the cross beam 35, the first cantilever 31, and the second cantilever 32 in this embodiment can all be selected as aluminum alloy materials and are fixedly connected by bolts.

[0087] Optionally, referring to Figure 4 , the vertical movement assembly 2 in the present invention includes a drive module 21, a guiding module 22, a connection module 23, and a main control circuit module 24; the guiding module 22 is vertically and fixedly arranged on one side of the base 1; the connection module 23 is movably arranged on the guiding module 22, and the grating device 3 is fixedly installed on the connection module 23; the main control circuit module 24 is electrically connected to the drive module 21; the drive module 21 is fixedly arranged on the guiding module 22, and the drive module 21 is connected to the connection module 23; the main control circuit module 24 is used to control the drive module 21 to drive the connection module 23 to drive the grating device 3 to move up and down.

[0088] Among them, the motor driver is a well-known public device purchased on the market, which is a servo stepping motor driver with the model ZDM-2HA860 produced by Beijing Times Supergroup Electric Technology Co., Ltd.

[0089] In this embodiment, when it is necessary to move the grating device 3 up and down to scan and obtain the knee joint grating image and the ankle joint grating image of the person to be measured, the drive module 21 is started, so that the drive module 21 drives the connection module 23 to move up and down along the guiding module 22, thereby driving the grating device 3 to move up and down through the connection module 23.

[0090] Optionally, referring toFigure 5 , the up-and-down moving component 2 in the present invention further includes an upper photoelectric switch 25 and a lower photoelectric switch 26; a guide rail 221 is vertically arranged on the guide module 22, and the connection module 23 is movably arranged on the guide rail 221; the upper photoelectric switch 25 and the lower photoelectric switch 26 are arranged on the side of the guide rail 221 and are both electrically connected to the main control circuit module 24; the upper photoelectric switch 25 is higher than the lower photoelectric switch 26.

[0091] In this embodiment, the upper photoelectric switch 25 and the lower photoelectric switch 26 are arranged on the side of the guide rail 221. When the connection module 23 moves past the upper photoelectric switch 25 or the lower photoelectric switch 26, the photoelectric switch signal triggers the main control circuit module 24, causing the drive module 21 to gradually decelerate until it stops, and also causing the connection module 23 to gradually stop, preventing excessive upward or downward movement that may cause the grating device 3 to collide and be damaged, thereby improving safety performance and controllability.

[0092] Furthermore, the up-and-down moving component 2 further includes a drag chain 27, which is used to accommodate and protect the data wire bundle and the power wire bundle in the grating device 3, preventing damage to the data wire bundle and the power wire bundle during the up-and-down movement.

[0093] Furthermore, referring to Figures 4 to 6 , an upper limit block 222 and a lower limit block 223 are arranged on the guide rail 221 in the present invention; the upper limit block 222 and the lower limit block 223 are arranged in the moving direction of the connection module 23; the height of the upper limit block 222 is higher than that of the upper photoelectric switch 25; the height of the lower limit block 223 is lower than that of the lower photoelectric switch 26.

[0094] In this embodiment, the upper limit block 222 and the lower limit block 223 are arranged on the guide rail 221 to achieve physical redundancy protection during use, serving as protection when the photoelectric switch fails, preventing the connection module 23 and the grating device 3 from colliding and being damaged due to excessive upward or downward movement.

[0095] Optionally, referring to Figures 5 to 7 , the drive module 21 in the present invention includes a driving member 211 and a transmission lead screw 212; the driving member 211 is arranged at the upper end of the guide module 22, and the driving member 211 is electrically connected to the main control circuit module 24; a cavity is arranged in the guide module 22, the transmission lead screw 212 is arranged in the cavity, and the upper end of the transmission lead screw 212 is connected to the driving member 211; a part of the connection module 23 extends into the cavity and is sleeved on the transmission lead screw 212 through a threaded sleeve, wherein the threaded sleeve is connected to the grating device 3.

[0096] In this embodiment, the driving member 211 drives the transmission lead screw 212 to rotate forward or backward, so that the connection module 23 moves upward or downward under the action of the threaded sleeve, that is, the threaded sleeve is connected to the grating device 3 through the connection module 23.

[0097] Further, the driving member 211 can be selected as a stepping motor. Among them, the motor driver is a well-known device purchased on the market and known to those skilled in the art, and it can be a servo stepping motor driver with the model ZDM-2HA860 produced by Beijing Times Supergroup Electric Technology Co., Ltd.

[0098] Further, referring to Figure 1 , the measuring device for knee distance and ankle distance in the present invention further includes two side plates 4, and the two side plates 4 are oppositely and vertically arranged on the side of the base 1 and are outside the grating device 3.

[0099] In this embodiment, two side plates 4 are oppositely and vertically arranged on the side of the base 1, and provide support for the person to be measured during use to ensure the standing stability of the person to be measured and improve the measurement accuracy.

[0100] Embodiment 2

[0101] Referring to Figure 8 , a method for measuring knee distance and ankle distance in the present invention is shown, which is used for the knee distance and ankle distance measurement system in Embodiment 1, and includes:

[0102] S1: Make the person to be measured stand on the base 1 facing or back to the grating emission module 33, and wear markers at the knee joint and ankle joint of the person to be measured;

[0103] S2: Start the up and down moving component 2, drive the grating device 3 to move up and down along the lower limbs of the person to be measured by using the up and down moving component 2, scan the knee joint and ankle joint of the person to be measured through the grating device 3, obtain the knee joint grating image and the ankle joint grating image, and transmit them to the host computer as the images to be recognized;

[0104] S3: The host computer searches for the markers at the knee joint and ankle joint in the image to be recognized, and marks the markers to form the image to be measured;

[0105] S4: In the image to be measured, the host computer uses 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, and draws a perpendicular line perpendicular to the human body height direction through the feature points as the measurement standard line;

[0106] S5: The host computer recognizes the length of the unobstructed area between the two blocked areas on the measurement standard line as the ankle distance or knee distance.

[0107] Optionally, referring to Figure 9 , in step S3, searching for the markers at the knee joint and ankle joint in the image to be recognized specifically includes:

[0108] 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.

[0109] 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 markers at the knee joint and the ankle joint, where n is the number of steps in the marker and y is the width of each step.

[0110] Optionally, in step S4, with reference to Figure 10 and Figure 11 Take 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: take 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.

[0111] Identify the length of the unoccluded area between the two occluded areas on the measurement reference line as the ankle distance or the knee distance, which specifically includes:

[0112] Remove the pixel unit closest to the unoccluded area in the occluded area as the unoccluded area; remove the pixel unit closest to the occluded area in the unoccluded area as the occluded area.

[0113] Identify the length of the unoccluded area between the two occluded areas on the measurement reference line as the ankle distance or the knee distance.

[0114] Optionally, in step S5, the calculation formula for the ankle distance or the knee distance is:

[0115] D = (B×C) - e

[0116] In the formula, D is the ankle distance or the knee distance, unit: mm; B is the number of measurement units of the unoccluded area between the two occluded areas on the measurement reference 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 and the 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. The wearable connecting piece and the marker are fixedly connected by gluing or clamping.

[0117] In this embodiment, markers are worn at the knee joint and the ankle joint. The markers are used as the reference 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 reference for the ankle distance or the knee distance. The feature points on the ankle joint and the knee joint can be automatically identified, which improves the consistency of the data during the measurement of the knee distance and the ankle distance and avoids the errors caused by the influence of human factors.

[0118] Specifically, when obtaining the image to be recognized 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. Since the standing postures are different when measuring O-shaped legs and X-shaped legs, there are three situations for the standing posture of 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 can be close together but the middle of the knee joints cannot be close together, then stand naturally after the feet are close together; if the knee joints can be close together but the middle of the feet cannot be close together, then stand naturally after the knee joints are close together.

[0119] Taking the number of steps of the marker being 2 layers as an example for illustration, where the width of each step is 10 mm, that is, the total width of the steps is 20 mm; the height of each step is 6 mm, that is, the total height of the steps is 12 mm.

[0120] A search window is set 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 being 6 mm and there being 2 layers of steps 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 occlusion area in the image to be recognized.

[0121] Scan the pixels on the side of the image to be recognized where the marker is set from bottom to top according to the method of step S3 above. Taking the width of each step being 10 mm and there being 2 layers of steps 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 of the search window at this time is the position of the markers at the knee joint and the ankle joint.

[0122] Calculate the knee distance and the ankle distance according to the processes of step S4 and step S5 above, where the measurement unit of the grating device 3 is 2.5 mm / piece.

[0123] In the present invention, the recognition module includes a search window module and a monitor. Among them, 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. 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 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, at this time, the position of the search window is the position of the markers at the knee joint and the ankle joint, and the markers are identified; n is the number of steps in the marker, and y is the width of each step. Wherein, the vertical coordinate change corresponding to 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.

[0124] 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, at this time, the position of the search window is the position of the markers at the knee joint and the ankle joint.

[0125] In the present invention, taking the intersection of the marker at the knee joint and the outer side of the knee and the intersection of the marker at the ankle joint and the outer side of the ankle as feature points specifically means: taking the intersection of the bottom end surface of the marker at the knee joint and the outer side of the knee and the intersection of the bottom end surface of the marker at the ankle joint and the outer side of the ankle as feature points.

[0126] Preferably, identifying the length of the unoccluded area between two occluded areas on the measurement standard line as the ankle distance or the knee distance specifically includes:

[0127] Removing the pixel unit closest to the unoccluded area in the occluded area as the unoccluded area; removing the pixel unit closest to the occluded area in the unoccluded area as the occluded area, so as to clearly distinguish the occluded area and the unoccluded area and improve the recognition accuracy of the measurement standard line; identifying the length of the unoccluded area between two occluded areas on the measurement standard line as the ankle distance or the knee distance.

[0128] Among them, the calculation formula for the ankle distance or the knee distance is:

[0129] D = (B × C) - e Where D is the ankle or knee distance, unit: mm; B is the number of measurement units of the unobstructed area between two obstructed areas on the measurement reference line, unit: number; C is the unit value of the measuring tool, unit: mm / number; 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 and ankle joint.

[0130] In the present invention, the ankle distance can also be measured alone, the knee distance can be measured alone, or the ankle distance and the knee distance can be measured simultaneously, and the development of the knee joint can be judged by the ankle distance and the knee distance.

Claims

1. A measurement system for knee distance and ankle distance, characterized in that The measurement system for the knee distance and ankle distance includes: a host computer, a measurement device for the knee distance and ankle distance, and a marker; Among them, the measurement device for the knee distance and ankle distance is used to perform raster scanning on the knee joint and ankle joint of the person to be measured, and obtain a knee joint raster image and an ankle joint raster image; The marker is worn at the knee joint and ankle joint of the person to be measured, and is used to determine the characteristic points of the knee joint and the characteristic points of the ankle joint; The host computer is electrically connected to the measurement device for the knee distance and ankle distance, and is used to obtain the knee joint raster image and the ankle joint raster image, and obtain the knee distance and ankle distance based on the knee joint raster image and the characteristic points of the knee joint and the ankle joint raster image and the characteristic points of the ankle joint.

2. The measurement system for knee distance and ankle distance according to claim 1, characterized in that, The measurement device for the knee distance and ankle distance includes a base (1), an up-and-down movement component (2), and a raster device (3); A standing surface (11) is provided on the upper side of the base (1) for the person to be measured to stand on during measurement; The up-and-down movement component (2) is fixedly arranged on one side edge of the base (1); The raster device (3) is connected to the up-and-down movement component (2), and the up-and-down movement component (2) drives the raster device (3) to move up and down, so as to scan the knee joint and ankle joint of the person to be measured during measurement, and obtain a knee joint raster image and an ankle joint raster image of the person to be measured; The raster device (3) is electrically connected to the host computer; The marker is a stepped structure including at least two layers of steps.

3. The measurement system for knee distance and ankle distance according to claim 2, characterized in that, The raster device (3) includes a first cantilever (31), a second cantilever (32), a raster emission module (33), a raster reception module (34), and a cross beam (35); The middle part of the cross beam (35) is connected to the up-and-down movement component (2); The first cantilever (31) and the second cantilever (32) are respectively fixedly arranged at both ends of the cross beam (35), and the first cantilever (31) and the second cantilever (32) are located on both sides above the standing surface (11); The raster emission module (33) is fixedly arranged on the first cantilever (31); The raster reception module (34) is fixedly arranged on the second cantilever (32) and corresponds to the raster emission module (33); The raster reception module (34) is electrically connected to the host computer.

4. The measurement system for knee distance and ankle distance according to claim 3, wherein The up-and-down movement component (2) includes a drive module (21), a guide module (22), a connection module (23), and a main control circuit module (24); The guide module (22) is vertically and fixedly arranged on one side edge of the base (1); The connection module (23) is movably arranged on the guide module (22), and the raster device (3) is fixedly installed on the connection module (23); The main control circuit module (24) is electrically connected to the drive module (21); The drive module (21) is fixedly arranged on the guide module (22), and the drive module (21) is connected to the connection module (23); The main control circuit module (24) is used to control the drive module (21) so that the connection module (23) drives the grating device (3) to move up and down.

5. The measurement system for knee distance and ankle distance according to claim 4, characterized in that, The up-and-down moving component (2) further includes an upper optoelectronic switch (25) and a lower optoelectronic switch (26); A guiding rail (221) is vertically arranged on the guiding module (22), and the connection module (23) is movably arranged on the guiding rail (221); The upper optoelectronic switch (25) and the lower optoelectronic switch (26) are arranged on the side of the guiding rail (221) and are both electrically connected to the main control circuit module (24); The upper optoelectronic switch (25) is higher than the lower optoelectronic switch (26).

6. The measurement system for knee distance and ankle distance according to claim 5, wherein The drive module (21) includes a drive member (211) and a transmission lead screw (212); The drive member (211) is arranged at the upper end of the guiding module (22), and the drive member (211) is electrically connected to the main control circuit module (24); A cavity is arranged in the guiding module (22), the transmission lead screw (212) is arranged in the cavity, and the upper end of the transmission lead screw (212) is connected to the drive member (211); A part of the connection module (23) extends into the cavity and is sleeved on the transmission lead screw (212) through a threaded sleeve, and the threaded sleeve is connected to the grating device (3).

7. A method for measuring knee distance and ankle distance, for the knee distance and ankle distance measurement system described in claim 2, characterized in that, Comprising: S1: Let the person to be measured stand on the base (1) facing or back to the grating emission module (33), and wear markers at the knee joint and ankle joint of the person to be measured; S2: Start the up-and-down moving component (2), use the up-and-down moving component (2) to drive the grating device (3) to move up and down along the lower limb of the person to be measured, scan the knee joint and ankle joint of the person to be measured through the grating device (3), obtain the knee joint grating image and the ankle joint grating image, and transmit them to the upper computer as the images to be recognized; S3: The upper computer searches for the markers at the knee joint and ankle joint in the image to be recognized, and marks the markers to form an image to be measured; S4: In the image to be measured, the upper computer takes the intersection points of the markers at the knee joint and the outer side of the knee joint, and the intersection points of the markers at the ankle joint and the outer side of the ankle joint as feature points, and draws perpendicular lines to the human body height direction through the feature points as the measurement standard lines; S5: The upper computer recognizes the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or knee distance.

8. The measuring method of knee distance and ankle distance according to claim 7, characterized in that In step S3, searching for the markers at the knee joint and 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; Scan the pixels on one side of the marker set in the image to be recognized from bottom to top using the search window. When the abscissa 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 at this time is the position of the markers at the knee joint and the ankle joint, where n is the number of steps in the marker and y is the width of each step.

9. The measurement method of knee distance and ankle distance according to claim 7, characterized in that In the step S4, taking the intersection of the marker at the knee joint and the outer side of the knee joint and the intersection of the marker at the ankle joint and the outer side of the ankle joint as feature points specifically means: taking the intersection of the bottom end face of the marker at the knee joint and the outer side of the knee joint and the intersection of the bottom end face of the marker at the ankle joint and the outer side of the ankle joint as feature points; Identifying the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or the knee distance specifically includes: Removing the pixel unit closest to the unobstructed area in the occluded area as the unobstructed area; removing the pixel unit closest to the occluded area in the unobstructed area as the occluded area; Identifying the length of the unobstructed area between two occluded areas on the measurement standard line as the ankle distance or the knee distance.

10. The measurement method of knee distance and ankle distance according to claim 9, characterized in that In the step S5, the calculation formula for the ankle distance or the knee distance is: D = (B×C) - e In the formula, D is the ankle distance or the 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 and the ankle joint.

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