Portable foot shooting and size measuring method

Abstract

The invention relates to a portable foot shooting and size measuring method, which comprises the following steps of: firstly, building a main body frame of a foot shooting device to ensure that the whole structure is stable; secondly, arranging a camera, and adjusting and fixing the pose of the camera; then, the camera collects foot images at the same time, and unified preprocessing operation is carried out on the foot images; secondly, selecting foot feature points based on a human foot anatomy structure; and finally, extracting the pixel distance of the foot feature point in the image, and performing size conversion in combination with the proportional relation with the actual size to obtain foot feature size data. The light-weight foot shooting device built by the method is simple in structure and convenient to operate, multi-directional acquisition of foot images and measurement of foot feature sizes can be realized, and the light-weight foot shooting device is suitable for quick acquisition and measurement of foot two-dimensional forms with different requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to a portable foot shooting and size measurement method, which is suitable for the rapid collection and measurement of foot two-dimensional morphology with different needs. BACKGROUND

[0002] Image-based size measurement is an important branch of non-contact size measurement, which has been widely used in the fields of biomedical engineering, clothing engineering and ergonomics in recent years. At present, there are many measuring devices for foot feature analysis. However, there are still the following two defects in practical application:

[0003] (1) In order to ensure that the foot image is collected completely and clearly at each viewing angle, the foot shooting device often has many cameras, large equipment volume and complex overall structure, and usually uses depth cameras, which is not conducive to large-scale promotion and use.

[0004] (2) The existing device usually designs the main body and the camera as a whole, which reduces the portability and flexibility of the system, and it is difficult to meet the diversified needs of foot image collection by adjusting the camera pose. SUMMARY

[0005] In order to solve the problems of complex equipment, cumbersome operation and poor portability in the prior art, the purpose of the present application is to disclose a portable foot shooting and size measurement method, which synchronously collects foot four-view images by using two-dimensional cameras, adjusts the camera pose by a telescopic rotating support, and is suitable for the rapid collection and measurement of foot two-dimensional morphology with different needs.

[0006] In order to achieve the above purpose, the present application provides a portable foot shooting and size measurement method, which comprises the following steps:

[0007] Step 1: Build the main frame of the foot shooting device to ensure the stability of the overall structure.

[0008] Step 2: Lay out the camera and adjust and fix its pose.

[0009]

[0009] Step 3: The camera simultaneously collects foot images, and performs unified preprocessing operation on the foot images.

[0010] Step 4: Select foot feature points based on human foot anatomy.

[0011] Step 5: Extract the pixel distance of the foot feature points in the image, combine the proportional relationship with the actual size, perform size conversion, and obtain foot feature size data.

[0012] Based on the above technical solution, the present application has the following beneficial effects:

[0013] The present application aims at the problems of large equipment volume, complex operation and poor portability of existing foot shooting devices, and builds a foot shooting device with simple structure, high portability and low cost, which only needs to extract the pixel distance in the foot image, and the real size data of the foot size can be obtained by means of the proportional relationship of the scale.

[0014] The present application improves the portability of foot image acquisition and foot size measurement by synchronously acquiring foot images from multiple perspectives and instantaneously adjusting the camera pose by means of the telescopic rotating support, and is suitable for the rapid acquisition and measurement of foot two-dimensional morphology with different requirements. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a portable foot shooting device according to an embodiment of the present application;

[0016] Figure 2 It is a detail view of Figure 1

[0017] Figure 3 It is a foot four-view obtained by an embodiment of the present application;

[0018] Figure 4 It is a foot feature point labeling schematic diagram according to an embodiment of the present application.

[0019] Figure 5 It is a foot feature size labeling schematic diagram according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] As shown in Figure 1 and Figure 2 , the present application provides a portable foot shooting and size measurement device, the main part of which is built by aluminum profiles and tempered glass, and the structure is stable, easy to disassemble and can safely bear the weight of at least one adult body. The aluminum profile is a square frame, and the tempered glass is horizontally placed above the aluminum profile.

[0022] After ensuring the stability of the overall structure of the device, a transparent scale with a length of 25cm is attached to the upper surface and the side of the glass platform formed by the tempered glass, which is used as a reference basis for subsequent size conversion. By comparing the pixel length of the scale in the image with the actual scale, the extracted pixel distance of the foot feature size is scaled proportionally, so that the real foot feature size data is obtained. ​

[0023] Furthermore, four ordinary cameras of the same model are installed at the top, bottom, left, and right of the main body of the device. The lens angle and shooting distance of the cameras are adjusted and fixed by a telescopic rotating bracket, and the lens parameters of the four cameras (including focal length, aperture, exposure time, etc.) are adjusted. At the same time, supplementary lights are added in areas with insufficient light to ensure that the foot edges and scales of the images from each perspective are clearly visible.

[0024] This application also provides a portable method for foot photography and size measurement. It only requires acquiring multi-view images of the human foot using a regular camera to achieve comprehensive acquisition of foot feature dimensions. Based on a foot photography device, this application utilizes a regular camera and a rotating stand to acquire foot images from different angles. Pixel distances are converted to actual dimensions based on scale markings. Foot feature dimensions are extracted solely from multi-view foot images. The specific steps include:

[0025] Step 1: Setting up the main body of the foot-shooting device:

[0026] Construct the main frame of the foot-shooting device to ensure overall structural stability.

[0027] Step 2: Adjusting and fixing the camera:

[0028] Cameras of the same model are set up at the top, bottom, left, and right of the main body of the foot imaging device. The position and posture of the cameras are adjusted and fixed to simultaneously acquire still foot images with clear edges and complete details from multiple angles and all directions. This ensures that the images from each perspective are clear and improves the consistency and repeatability of subsequent measurements.

[0029] Furthermore, the camera is connected to a telescopic rotating bracket to give the camera a high degree of flexibility.

[0030] Specifically, the camera described in this application embodiment is a standard two-dimensional camera, not a depth camera, and therefore requires no three-dimensional depth camera or three-dimensional reconstruction algorithm. By capturing multi-view images of the feet in a static state simultaneously, foot size measurement can be achieved simply by acquiring two-dimensional images of the human foot.

[0031] Step 3: Taking and processing foot images:

[0032] like Figure 3 As shown, the subject places their feet in the center of the device platform and remains still. Four cameras simultaneously acquire foot images from four perspectives: top, bottom, left, and right. The foot images are then subjected to uniform preprocessing operations, including image noise reduction, removal of redundant background, and edge enhancement, to improve image quality and subsequent processing efficiency.

[0033] Step 4: Selection and marking of foot feature points:

[0034] like Figure 4 As shown, based on the anatomical structure of the human foot, foot feature points that can indicate the morphological characteristics of the foot are selected, covering key parts such as toes, arches, heels, and medial and lateral malleoli, as the benchmark for subsequent foot size extraction and measurement, ensuring the comprehensiveness and scientific nature of subsequent foot feature size measurements.

[0035] Step 5: Extraction and measurement of foot feature dimensions:

[0036] The horizontal and vertical pixel distances between the foot feature points are extracted. By using the proportional relationship between the pixel distances of the scale markings in the image and the actual dimensions, the pixel distances are converted into actual dimensions, thereby obtaining foot feature size data, including vertical length, horizontal width, and height data.

[0037] based on Figure 5 The data obtained by annotation are shown in Table 1. The longitudinal length includes, but is not limited to, foot length, foot midline length, length of the big toe lateral protrusion, length of the first metatarsophalangeal joint, length of the fifth toe tip, length of the little toe lateral protrusion, length of the fifth toe joint, forefoot length, length of the lumbar region, length of the tarsal protrusion, length of the dorsum of the foot, and center of gravity position. The transverse width includes, but is not limited to, toe row width, basic width, lumbar region width, and width of the medial and lateral malleoli. The height data includes, but is not limited to, the height of the big toe, the height of the first metatarsophalangeal joint, the height of the tarsal protrusion, the height of the supraventral flexure, the height of the lateral malleolus, and the height of the medial malleolus.

[0038] Table 1 Foot Feature Dimension Data

[0039]

[0040] Based on the data obtained in the table above, it is verified that the four sets of flexibly adjustable ordinary cameras provided by this invention can capture foot images from different angles, thereby achieving comprehensive extraction of foot feature dimensions in length, width and height.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method of portable foot photography and sizing, characterized by, The method comprises the following steps: Step 1: build the main frame of the foot photographing device to ensure the stability of the overall structure; Step 2: arrange the camera and adjust and fix the position of the camera; Step 3: the camera simultaneously collects foot images and performs unified preprocessing operation on the foot images; Step 4: select foot feature points based on human foot anatomy structure; Step 5: extract the pixel distance of the foot feature points in the image, combine the proportional relationship with the actual size, and perform size conversion to obtain foot feature size data.

2. The method of claim 1, wherein, The main frame of the foot photographing device comprises aluminum profiles and tempered glass; the aluminum profiles are square frames, and the tempered glass is horizontally placed above the aluminum profiles.

3. The method according to claim 1 or 2, characterized in that, The step 2 is specifically as follows: Arrange the camera in the upper, lower, left and right four directions of the main body of the foot photographing device, adjust the position of the camera through the telescopic rotating support, and then fix the position of the camera to synchronously collect foot images from multiple angles.

4. The method of claim 3, wherein, The step 3 is specifically as follows: The subject places the foot on the central platform of the device and keeps still, the camera simultaneously collects foot images from each angle, and unified preprocessing operation is performed on the foot images to improve the image quality and subsequent processing efficiency.

5. The method according to claim 1 or 4, characterized in that, The preprocessing operation comprises image noise reduction, removal of redundant background and edge increase.

6. The method of claim 1, wherein, The foot feature points comprise toes, arches, heels and medial and lateral malleoli.

7. The method of claim 2, wherein, The upper surface of the tempered glass is provided with a scale, which is used to proportionally scale the pixel distance of the extracted foot feature size by comparing the pixel length of the scale in the image with the actual scale, so as to obtain the real foot feature size data.

8. The method of claim 7, wherein, The foot feature size comprises longitudinal length, transverse width and height data of the foot.

9. The method of claim 8, wherein: the longitudinal length includes but is not limited to foot length, midfoot axis length, thumb protrusion length, first metatarsophalangeal joint length, fifth toe end point length, little toe protrusion length, fifth metatarsal-phalangeal joint length, forefoot palm length, waist position length, tarsal protrusion length, instep length, and center of gravity position; the transverse width includes but is not limited to toe row width, basic width, waist width, and medial and lateral malleolus width; the height data includes but is not limited to thumb height, first metatarsophalangeal joint height, tarsal protrusion height, supranavicular flexion point height, lateral malleolus point height, and medial malleolus point height.

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