Foot shape measuring system and foot shape measuring method

Abstract

A foot shape measurement system includes an input accepting section that accepts input of 3D data representing a three-dimensional shape of a foot, and a characteristic parameter calculating section that calculates a characteristic parameter of the foot based on the 3D data. The characteristic parameter calculating section includes a distance calculating section that calculates, with respect to a rear portion of the foot as viewed in a transverse direction, a distance in a foot length direction between a protruding point that is most protruding within a heel region and a retreating point that is last retreating within an Achilles tendon region.

Description

Technical Field

[0001] This disclosure relates to a foot shape measurement system and a foot shape measurement method, and more specifically, to a foot shape measurement system and a foot shape measurement method capable of calculating indicators for selecting finished shoes. Background Technology

[0002] It is known that a technique is used to select finished shoes that fit the three-dimensional shape of the foot by using 3D data obtained from measuring the three-dimensional shape of the foot (for example, see Patent Document 1). Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Application Publication No. 2003-108831 Summary of the Invention The problem that the invention aims to solve

[0004] Figure 7 This is a simplified diagram of foot 6. Figure 8 This is a simplified diagram of shoe number 8. If... Figure 7 The shape of the upper part 7 of the heel above the most prominent part 6a at the rear of the foot 6 shown is similar to... Figure 8 If the shape of the heel 9 of the shoe 8 corresponds well to the shape of the heel, then when walking while wearing the shoe 8, the upper part 7 of the heel of the foot 6 will hook onto the heel 9 of the shoe 8, and the shoe 8 will not fall off. If the shape of the upper part 7 of the heel of the foot 6 does not correspond well to the shape of the heel 9 of the shoe 8, then when walking, the back of the foot 6 will float, and the shoe 8 will easily fall off.

[0005] If a finished shoe with a different shape for the heel 9 of the shoe 8 is manufactured in accordance with the different shape of the upper heel 7 of the foot 6, then a finished shoe that fits the shape of the upper heel 7 of the foot 6 can be selected.

[0006] However, while JIS standards specify foot length, foot circumference, and foot width for finished shoes, they do not specify the shape of the back of the foot. Therefore, it is difficult to choose finished shoes that fit the back shape of the foot.

[0007] This disclosure describes a foot shape measurement system and method for easily selecting a finished shoe that fits the rear shape of the foot. Solution for solving the problem

[0008] To address the aforementioned issues, this disclosure provides a foot shape measurement system configured as follows.

[0009] A foot shape measurement system includes: (a) an input receiving unit for receiving 3D data representing the three-dimensional shape of a foot; and (b) a feature parameter calculation unit for calculating feature parameters of the foot based on the 3D data. The feature parameter calculation unit includes (i) a distance calculation unit that calculates the distance along the length of the foot between the most prominent protrusion within the heel region and the last retreating point within the Achilles tendon region, for a laterally viewed view of the posterior portion of the foot.

[0010] Based on the above structure, the distance calculated by the distance calculation unit can be used as an indicator for selecting finished shoes. By preparing finished shoes according to the distance, it is easy to select finished shoes that fit the shape of the back of the foot.

[0011] Preferably, the feature parameter calculation unit further includes: (ii) a foot length calculation unit for calculating the foot length; and (iii) a heel index calculation unit for calculating the ratio of the distance to the foot length, i.e., the heel index.

[0012] In this case, the heel index calculated by the heel index calculation unit can be used as an indicator for selecting finished shoes. By preparing finished shoes based on the heel index, it is easy to select finished shoes that fit the shape of the back of the foot. When finished shoes are designed in a way that the shape of the heel is the same even if the foot length is different, the manufacturing and selection of finished shoes become easier.

[0013] Preferably, the feature parameter calculation unit further includes (iv) a partition determination unit, which determines the partition to which the following index belongs.

[0014] In this case, the zone to which the heel index belongs can be used as an indicator for selecting finished shoes. By preparing finished shoes with different heel shapes according to each zone to which the heel index belongs, the manufacturing and selection of finished shoes becomes easier.

[0015] Preferably, the distance calculation unit calculates the heel range and the Achilles tendon range based on the foot length, and calculates the distance between the most prominent protrusion point within the calculated heel range and the last retreating point within the calculated Achilles tendon range.

[0016] In this case, the heel and Achilles tendon ranges can be appropriately set according to the foot length.

[0017] The foot shape measurement system further includes: (c) a measurement unit for measuring the three-dimensional shape of the foot; and (d) a 3D data generation unit for generating 3D data representing the three-dimensional shape of the foot based on the data measured by the measurement unit. The input receiving unit receives the 3D data generated by the 3D data generation unit as input.

[0018] In this case, a foot measurement system that can calculate representative indicators such as foot length and foot circumference by measuring the three-dimensional shape of the foot can be equipped with a function to calculate indicators related to the shape of the back of the foot.

[0019] In addition, in order to solve the above-mentioned problems, this disclosure provides a foot shape measurement method configured as follows.

[0020] A foot shape measurement method for obtaining shape features of a foot includes: (i) a protrusion point determination step, which determines the most prominent protrusion point within the heel region for the rear portion of the foot as viewed laterally; (ii) a posterior point determination step, which determines the last posterior point within the Achilles tendon region for the rear portion of the foot as viewed laterally; and (iii) a distance measurement step, which measures the distance in the length direction of the foot between the protrusion point and the posterior point.

[0021] According to the above method, finished shoes are prepared based on the distance measured in the distance measurement step, making it easy to select finished shoes that fit the shape of the back of the foot.

[0022] Preferably, the foot shape measurement method further includes: (iv) a foot length calculation step, calculating the foot length; and (v) a heel index calculation step, calculating the ratio of the distance to the foot length, i.e., the heel index.

[0023] In this case, the zone to which the heel index belongs can be used as an indicator for selecting finished shoes. By preparing finished shoes with different heel shapes according to each zone to which the heel index belongs, the manufacturing and selection of finished shoes becomes easier. Invention Effects

[0024] According to this disclosure, it is possible to calculate characteristic parameters related to the shape of the back of the foot. By using these characteristic parameters as indicators to prepare finished shoes, it is easy to select finished shoes that are suitable for the shape of the back of the foot. Attached Figure Description

[0025] Figure 1 This is a block diagram of a foot shape measurement system. (Example 1) Figure 2 This is a block diagram of the feature parameter calculation unit. (Example 1) Figure 3 (a) is a simplified diagram of the foot viewed from the side. Figure 3 (b) is a simplified diagram of the foot as viewed from above. (Example 1) Figure 4 This is an image output from a printer. (Example 1) Figure 5 This is a block diagram of a foot shape measurement system. (Example 2) Figure 6 This is the image displayed on the screen. (Example 2) Figure 7 It is a simplified diagram of a foot. Figure 8 It is a simplified diagram of a foot. Detailed Implementation

[0026] The foot shape measurement system and foot shape measurement method of this disclosure will be described below with reference to the accompanying drawings.

[0027] <Example 1> Refer to Figures 1-4 The foot shape measurement system 10 of Embodiment 1 will be described below. The foot shape measurement system 10 performs a foot shape measurement method as a measurement method for obtaining the shape features of the foot.

[0028] Figure 1 This is a block diagram showing the overall structure of the foot shape measurement system 10. (See diagram below.) Figure 1 As shown, the foot shape measurement system 10 includes a measurement unit 12, a terminal 16, and a data processing unit 20. The measurement unit 12 and the terminal 16 are connected to the data processing unit 20 directly or via a communication network such as the Internet. For example, the data processing unit 20 may consist of one or more servers. For example, the data processing unit 20 may be configured as a computer device including a processor such as a CPU, memory such as ROM and RAM, storage and communication devices, etc. For example, the terminal 16 may be a smartphone, tablet computer, personal computer, etc. The data processing unit 20 and the terminal 16 may also be configured using a single personal computer.

[0029] The measuring unit 12 measures the three-dimensional shape of the foot 6. For example, the measuring unit 12 is configured to measure the shape of the foot 6 placed on the transparent plate 14 by means of optical transectation. The data 13 measured by the measuring unit 12 is sent to the data processing unit 20.

[0030] The data processing unit 20 includes a 3D data generation unit 22, an input receiving unit 24, a feature parameter calculation unit 26, a communication unit 28, and a data storage unit 21.

[0031] The 3D data generation unit 22 generates 3D data 23 representing the three-dimensional shape of the foot 6 based on the data 13 sent from the measurement unit 12 to the data processing unit 20.

[0032] The input receiving unit 24 receives the input of the 3D data 23 generated by the 3D data generation unit 22, and sends the received 3D data 25 to the feature parameter calculation unit 26 and the communication unit 28.

[0033] The feature parameter calculation unit 26 calculates various feature parameters 27 of the foot 6 based on the 3D data 25 sent from the input receiving unit 24, and sends the feature parameters to the communication unit 28.

[0034] The communication unit 28 receives data 17 from the terminal 16 and sends data 29 to the terminal 16. For example, based on the data 17 sent according to the operation in the terminal 16, the communication unit 28 generates data 29 for displaying on the screen of the terminal 16 or outputting to a printer (not shown) connected to the terminal 16, such as a three-dimensional image of 3D data 25 sent from the input receiving unit 24 or feature parameters 27 sent from the feature parameter calculation unit 26. The communication unit 28 then sends the generated data 29 to the terminal 16.

[0035] The data storage unit 21 stores, as needed, the 3D data 23 generated by the 3D data generation unit 22, the feature parameters 27 calculated by the feature parameter calculation unit 26, and so on.

[0036] Figure 2 This is a block diagram of the characteristic parameter calculation unit 26. For example... Figure 2 As shown, the feature parameter calculation unit 26 includes a foot length calculation unit 26a for calculating foot length, a foot circumference calculation unit 26b for calculating foot circumference, a foot width calculation unit 26c for calculating foot width, and a heel width calculation unit 26d for calculating heel width. The feature parameter calculation unit 26 also includes a distance calculation unit 30 for calculating feature parameters related to the rear shape of the foot 6, a heel index calculation unit 32, and a partition determination unit 34. Alternatively, the heel index calculation unit 32 and / or the partition determination unit 34 may be omitted from the feature parameter calculation unit 26.

[0037] Reference Figure 3 (a) and Figure 3 (b) To describe the characteristic parameters related to the rear shape of foot 6. Figure 3 (a) is a simplified diagram of foot 6 in contact with plane 4, viewed from the lateral direction (left and right of foot 6). Figure 3 (b) is a simplified diagram of foot 6 as viewed from above plane 4.

[0038] like Figure 3 (a) and Figure 3 As shown in (b), the direction of the center line 6x of the foot passing through the tip 6a of the second toe of the foot 6 is defined as the first direction 1 (front-back direction 1), and the distance of the first direction 1 from the rear end of the heel of the foot 6 to the longest toe (e.g., 6b) is defined as the foot length L1. The direction parallel to the plane 4 and intersecting (typically orthogonal) the first direction 1 is defined as the second direction 2 (left-right direction 2), and the direction intersecting (typically orthogonal) the plane 4 is defined as the third direction 3 (height direction 3).

[0039] Furthermore, the first direction 1 and the foot length L1 can also be defined differently from those described above. For example, the direction of the boundary line between the left and right feet when they are arranged in a way that they touch each other can be defined as the first direction 1, and the maximum length of each of the left and right feet in the first direction 1 can be defined as the foot length L1.

[0040] Leg length calculation section 26a (refer to) Figure 2 The steps of performing the foot shape measurement method are as follows: the foot length calculation step for calculating the foot length L1 of foot 6.

[0041] like Figure 3 As shown in (a), when viewing the posterior part of foot 6 from the second direction 2, the most prominent point within the heel region H1 is defined as the protrusion point P1, and the last point to recede within the Achilles tendon region H2 is defined as the receding point P2. The distance between the protrusion point P1 and the receding point P2 in the length direction of the foot (first direction 1) is defined as L2. Furthermore, the upper limit of the heel region H1 and the lower limit of the Achilles tendon region H2 can be the same, and the heel region H1 and the Achilles tendon region H2 can also overlap.

[0042] The ratio (%) of distance L2 to foot length L1 is defined as the heel index. If the heel index is H, then... H = (L2 / L1) × 100 (Equation 1).

[0043] The distance calculation unit 30 receives the input 3D data 25 from the input receiving unit 24 and calculates the distance L2 between the protruding point P1 and the retreating point P2 for the rear of the foot 6 as viewed from the lateral direction (second direction 2). For example, for a cross-section of the foot 6 parallel to the plane 4, the distance calculation unit 30 calculates the coordinate values ​​of the rear end (the end opposite to the toes in the first direction 1) of the outline of the foot 6 in each cross-section while changing the position of the cross-section in the third direction 3 (height direction 3). For the coordinate values ​​of the rear end in the first direction 1 in each cross-section, the distance calculation unit 30 extracts the coordinate values ​​of the last side (opposite toes) within the heel range H1 and the foremost side (toes side) within the Achilles tendon range H2. The distance calculation unit 30 calculates the absolute value of the difference between the extracted coordinate values ​​as the distance L2.

[0044] The distance calculation unit 30 performs the steps of the foot shape measurement method, namely (i) a protrusion point determination step for determining the most prominent protrusion point P1 within the heel range H1 for the rear part of the foot 6 as viewed from the lateral (second direction 2); (ii) a retrace point determination step for determining the last retreat point P2 within the Achilles tendon range H2 for the rear part of the foot 6 as viewed from the lateral; and (iii) a distance measurement step for measuring the distance L2 in the foot length direction (first direction 1) between the protrusion point P1 and the retrace point P2.

[0045] The heel range H1 and Achilles tendon range H2 can be predetermined fixed ranges, or they can be individually determined based on the foot length L1 calculated by the foot length calculation unit 26a. For example, the foot length L1 calculated by the foot length calculation unit 26a can be multiplied by a predetermined coefficient to determine the range of the heel range H1 and the Achilles tendon range H2, i.e., the cross-sectional height (the coordinate value of the third direction 3).

[0046] The Achilles tendon range H2 can be determined by multiplying the height of the protruding point P1 by a coefficient of the specified range, or by adding the height of the protruding point P1 to the dimensions of the specified range.

[0047] Furthermore, the upper and lower limits of the Achilles tendon range H2 can be the same. For example, the height of the Achilles tendon range H2 can be the height of the protruding point P1 multiplied by a certain coefficient, or it can be the height of the protruding point P1 plus a certain dimension.

[0048] The heel index calculation unit 32 calculates the heel index H, which shows the ratio of distance L2 to foot length L1, based on the foot length calculation unit 26a and the distance calculation unit 30.

[0049] The heel index calculation unit 32 performs the foot shape measurement method steps, namely, the heel index calculation step, which calculates the ratio of distance L2 to foot length L1, i.e., the heel index H.

[0050] The partition determination unit 34 determines the partition to which the follower index H calculated by the follower index calculation unit 32 belongs, and calculates the partition data corresponding to the partition. For example, when the follower index H is less than 3%, it is determined to be partition A. When the follower index H is 3% or more but less than 5%, it is determined to be partition B. When the follower index H is 5% or more, it is determined to be partition C.

[0051] At least one of the following, namely distance, heel index, and the partition to which the heel index belongs, is displayed on the screen of terminal 16 along with the leg length, or on the screen of a display device (not shown) arranged adjacent to the measurement unit 12 and displaying the measurement method, or output from a printer (not shown) arranged adjacent to the measurement unit 12 or a printer (not shown) connected to terminal 16.

[0052] Furthermore, the feature parameter calculation unit 26 may or may not include a protrusion height calculation unit 36 ​​that calculates the height of the protrusion P1 of the foot 6 (the coordinate value of the third direction 3).

[0053] Next, an overview of the data processing performed in the foot shape measurement system 10 will be described.

[0054] Data 13 measured by measurement unit 12 is sent to data processing unit 20. In data processing unit 20, 3D data generation unit 22 generates 3D data 23 based on the data 13 from measurement unit 12, and input receiving unit 24 receives the generated 3D data 23 as input. The input receiving unit 24 receives the input 3D data 25 and sends it to feature parameter calculation unit 26 and communication unit 28. Based on the input 3D data 25 received by input receiving unit 24, feature parameter calculation unit 26 calculates leg length L1, distance L2, heel index H, etc., determines the partition to which the heel index H belongs, and calculates partition data assigned to the partition to which the heel index belongs. These feature parameters 27 calculated by feature parameter calculation unit 26 are sent to communication unit 28. Communication unit 28 sends data 29 to terminal 16 and the like for displaying or printing the feature parameters 27 in an appropriate format.

[0055] Figure 4 This is an example of an image output from a printer that is not shown, based on data 29 sent from the communications unit 28. For example... Figure 4 As shown, print the heel index and the partition to which the heel index belongs, based on the foot length of each foot.

[0056] The distance L2, heel index H, and the zone to which the heel index H belongs, obtained by the foot shape measurement system 10, can be used as indicators for selecting finished shoes.

[0057] When finished shoes are designed in a way that the shape of the heel is the same even if the foot length L1 is different, the manufacturing and selection of finished shoes become easier.

[0058] By manufacturing finished shoes with different heel shapes according to each zone to which the heel index H belongs, the manufacturing and selection of finished shoes becomes easier.

[0059] The foot shape measurement system 10 adds the function of calculating indicators related to the shape of the back of the foot to a foot measurement system that measures the three-dimensional shape of the foot and calculates representative indicators such as foot length.

[0060] The foot shape measurement method performed by the foot shape measurement system 10 includes: (i) a protrusion point determination step for determining the most prominent protrusion point within the heel region for the posterior part of the foot as viewed from the lateral side; (ii) a posterior point determination step for determining the last posterior point within the Achilles tendon region for the posterior part of the foot as viewed from the lateral side; and (iii) a distance measurement step for measuring the distance in the foot length direction between the protrusion point and the posterior point, further including: (iv) a foot length calculation step for calculating the foot length; and (v) a heel index calculation step for calculating the ratio of the distance to the foot length, i.e., the heel index.

[0061] <Example 2> Refer to Figure 5 and Figure 6 The foot shape measurement system 11 of Embodiment 2 will be described below. The foot shape measurement system 11 of Embodiment 2 has a portion of the same structure as the foot shape measurement system 10 of Embodiment 1, and calculates feature parameters using 3D data of the foot that has been measured and generated. The foot shape measurement system 11 performs the foot shape measurement method in the same way as the foot shape measurement system 10 of Embodiment 1. Hereinafter, the description will focus on the differences from Embodiment 1.

[0062] Figure 5 This is a block diagram of the foot shape measurement system 11 in Embodiment 2. Figure 5 As shown, the foot shape measurement system 11 includes a display device 40 for displaying images on an LCD panel or the like, an operating device 42 such as a touchpad or mouse, and an information processing device 44. The foot shape measurement system 11 is configured using a server or personal computer, etc. The display device 40, the operating device 42, and the information processing device 44 can also be integrated into a single laptop computer.

[0063] The information processing device 44 includes an input receiving unit 46, a feature parameter calculation unit 48, and an output unit 50. The information processing device 44 may also be configured to be distributed among multiple servers or the like.

[0064] The input receiving unit 46 accepts input of 3D data representing the three-dimensional shape of the foot. For example, 3D data generated by measuring the three-dimensional shape of the foot and stored in a database (not shown) or a USB memory, etc., is input to the input receiving unit 46.

[0065] Similar to Embodiment 1, the feature parameter calculation unit 48 calculates the feature parameters of the foot based on the input 3D data 47 received by the input receiving unit 46. The feature parameter calculation unit 48 is similar to that in Embodiment 1 (see Example 1). Figure 2 Similarly, it is constructed including a foot length calculation unit, a distance calculation unit, a heel index calculation unit, and a partition determination unit, which calculates characteristic parameters such as foot length, distance, heel index, and partition data assigned to the partition to which the heel index belongs.

[0066] The output unit 50 generates data for display on the screen of the display device 40 or for printing on a printer (not shown) based on various feature parameters 49 calculated by the feature parameter calculation unit 48, according to the operation of the operation device 42, and outputs the generated data to the display device 40, etc.

[0067] Figure 6 This is an example of an image displayed on the screen of display device 40. For example... Figure 6As shown, the display device 40 displays an input receiving unit 60 that accepts 3D data (e.g., STL data), a range setting unit 62 for setting the upper and lower limits of the heel range and Achilles tendon range, a set value setting button 64 for setting the upper and lower limits of the heel range and Achilles tendon range to a set value, a data output unit 66 that displays the file name, and an output button 68.

[0068] By observing the screen on the display device 40 and operating the operation device 42, the foot shape measurement system 11 performs data processing. For example, if the upper and lower limits of the heel range and Achilles tendon range displayed on the range setting unit 62 are set to desired values, and 3D data is submitted or pasted to the input receiving unit 60, the foot shape measurement system 11 automatically calculates representative indicators such as foot length and characteristic parameters related to the shape of the back of the foot (distance, heel index, heel zone), and displays the filename of the output data, which includes the calculated data, in CSV format on the data output unit 66. When the output button 68 is clicked, the foot shape measurement system 11 downloads the output data to a specified file or storage medium.

[0069] The foot shape measurement system 11 of Example 2 calculates feature parameters that can be used as indicators for selecting finished shoes that are suitable for the rear shape of the foot, based on the 3D data of the foot that has been measured and generated.

[0070] <Summary> As explained above, the foot shape measurement system calculates characteristic parameters that can be used as indicators for selecting finished shoes. By preparing finished shoes based on these indicators, it becomes easier to select shoes that fit the shape of the back of the foot.

[0071] Furthermore, the present invention is not limited to the above-described embodiments and can be implemented with various modifications.

[0072] For example, the feature parameters related to the shape of the back of the foot calculated by the foot shape measurement system can also be used in the design of custom shoes. Furthermore, in the above embodiment, the three-dimensional shape is measured by the measurement unit 12, but instead of the data 13 measured by the measurement unit 12, 3D data can be generated using data obtained through image analysis after image capture. Moreover, in the foot shape measurement method, instead of using the 3D data generated by measuring the three-dimensional shape of the foot, a measuring instrument can be used to simultaneously or individually measure the foot length L1, the distance L2 between the protrusion point P1 and the posterior point P2, calculate the heel index, and determine the zone to which the heel index belongs using a lookup table. Industrial availability

[0073] According to several methods disclosed herein, characteristic parameters related to the shape of the back of the foot can be calculated. By using these characteristic parameters as indicators to prepare finished shoes, it is easy to select finished shoes that are suitable for the shape of the back of the foot. Explanation of reference numerals in the attached figures

[0074] 6: Feet 10, 11: Foot shape measurement system 12: Measurement Unit 13: Measured data 22: 3D Data Generation Department 23: 3D Data 24: Input Receiving Unit 25: 3D Data 26: Characteristic Parameter Calculation Section 26a: Leg Length Calculation Section 27: Characteristic Parameters 30: Distance Calculation Department 32: Follow-up Index Calculation Department 34: Partition Determination Department 46: Input Receiving Unit 47: 3D Data 48: Characteristic Parameter Calculation Unit 49: Feature Parameters H: Follower Index H1: Follower range H2: Achilles tendon extent L1: Foot length L2: Distance P1: Highlight P2: Backwards point.

Claims

1. A foot shape measurement system, comprising: The input receiving unit accepts 3D data representing the three-dimensional shape of the foot; and The feature parameter calculation unit calculates the feature parameters of the foot based on the 3D data. in, The feature parameter calculation unit includes a distance calculation unit that calculates the distance along the length of the foot between the most prominent protrusion within the heel region and the last retreating point within the Achilles tendon region, for the rear of the foot as viewed laterally.

2. The foot shape measurement system according to claim 1, wherein, The feature parameter calculation unit further includes: A foot length calculation unit calculates the length of the foot; and The heel index calculation unit calculates the ratio of the distance to the foot length, i.e., the heel index.

3. The foot shape measurement system according to claim 2, wherein, The feature parameter calculation unit further includes a partition determination unit, which determines the partition to which the following index belongs.

4. The foot shape measuring system according to claim 2 or 3, wherein, The distance calculation unit calculates the heel range and the Achilles tendon range based on the foot length, and calculates the distance between the most prominent protrusion point within the calculated heel range and the last retreating point within the calculated Achilles tendon range.

5. The foot shape measuring system according to any one of claims 1 to 3, wherein, It also has: A measuring unit measures the three-dimensional shape of the foot; as well as The 3D data generation unit generates 3D data representing the three-dimensional shape of the foot based on the data measured by the measurement unit. The input receiving unit accepts the input of the 3D data generated by the 3D data generating unit.

6. A foot shape measurement method, which is a measurement method for obtaining the shape characteristics of a foot, wherein, include: The protrusion point determination step involves identifying the most prominent protrusion point within the heel area, based on the rear of the foot as viewed laterally. The step of determining the retreat point involves identifying the final retreat point within the Achilles tendon region, based on the rear of the foot as observed from the lateral view. as well as The distance measurement step involves measuring the distance in the foot length direction between the protruding point and the retreating point.

7. The foot shape measurement method according to claim 6, wherein, Also includes: Steps for calculating foot length: Calculate the foot length; as well as The heel index calculation step involves calculating the ratio of the distance to the foot length, i.e., the heel index.

Images