Shoe fit evaluation device and shoe fit evaluation method

Abstract

The present invention provides a technique for improving the accuracy of selecting a shoe that fits a foot. In a shoe fit evaluation system (100), a size difference calculation section (72) calculates a difference between a measured value of a foot part size and a last part size corresponding to the foot part, i.e., a part size difference, in a form that makes a predetermined adjustment corresponding to the part. An evaluation processing section (74) calculates a last fit rate based on the part size difference. An output section outputs information related to the last fit rate. As the predetermined adjustment, the size difference calculation section (72) calculates the part size difference in a form that subtracts an allowance amount corresponding to the individual stretch characteristics of each part of the shoe.

Description

TECHNICAL FIELD

[0001] The present application relates to a shoe fit evaluation device and a shoe fit evaluation method. In particular, it relates to a technology for evaluating the fit of a shoe based on a measured value of a foot shape. BACKGROUND

[0002] A technology is known in which a foot shape of a person who is considering purchasing a shoe is three-dimensionally measured, and the measured value is used to analyze whether the shoe fits (see, for example, Patent Documents 1 and 2).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2005-169015

[0006] Patent Document 2: U.S. Patent Application Publication No. 2017 / 0053335 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In Patent Documents 1 and 2, the foot shape of the subject person is compared with the size of a last by comparison. However, the specific comparison method of the foot shape and the last is not disclosed in the prior art. In general, the information of the last is information that should be kept secret for a shoe manufacturer who condenses technology and skill, and only the manufacturer of the shoe knows the correct size of the last, the design idea of each shoe, the material, the characteristics, and the like. Therefore, even if the comparison of the foot shape and the last is theoretically possible, it is difficult to say that a method that sufficiently reflects the comparison of the design idea, the characteristics of the shoe and the last, and the fit analysis is provided in reality.

[0009] On the other hand, there are sometimes professionals called shoemakers who have rich knowledge and skills and can select a shoe suitable for a customer's foot in a store front of a shoe selling store or the like. Therefore, it is desired to develop a technology that enables easy selection of a satisfactory shoe like a shoemaker even without such professional knowledge and skills.

[0010] The present application was made in view of such a situation, and aims to provide a technology that realizes an increase in the precision of selecting a shoe that fits a foot.

[0011] SOLUTION TO THE PROBLEM

[0012] To solve the above problems, one aspect of the present application is a shoe fit evaluation device including: a measurement value acquisition unit that acquires measurement values of sizes of a plurality of foot parts including a foot length, as foot shape size information that specifies a foot shape of a measurement target person; a last storage unit that stores sizes of last parts corresponding to the plurality of foot parts including the foot length, as last size information that specifies a last, for each of a plurality of lasts; a size difference calculation unit that calculates differences between the measurement values of the sizes of the foot parts and the sizes of the last parts corresponding to the foot parts, as part size differences, in a manner that predetermined adjustments corresponding to the parts are made; an evaluation processing unit that calculates a last fit rate based on the part size differences; and an output unit that outputs information related to the last fit rate.

[0013] Another aspect of the present application is a shoe fit evaluation method. The method includes the following processes: a process of acquiring measurement values of sizes of a plurality of foot parts including a foot length, as foot shape size information that specifies a foot shape of a measurement target person; a process of reading out sizes of last parts corresponding to the plurality of foot parts including the foot length, as last size information that specifies a last, from a predetermined storage unit; a process of calculating differences between the measurement values of the sizes of the foot parts and the sizes of the last parts corresponding to the foot parts, as part size differences, in a manner that predetermined adjustments corresponding to the parts are made; a process of calculating a last fit rate based on the part size differences; and a process of outputting information related to the last fit rate.

[0014] Effects of the present application are as follows.

[0015] According to the present application, it is possible to provide a technique that improves the accuracy of selecting a shoe that fits a foot. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a diagram showing the basic structure of a shoe fit evaluation system.

[0017] Figure 2 is a diagram schematically showing the correspondence relationship between the foot shape of a measurement target person and the parts in a last.

[0018] Figure 3 is a functional block diagram showing the functions of each structure of a shoe fit evaluation system.

[0019] Figure 4 is a flowchart showing the processes of shoe fit evaluation processing.

[0020] Figure 5 is a diagram showing an example of a screen of shoe recommendation information.

[0021] Figure 6 is a diagram showing a first example of a comparison page of a foot shape and a last.

[0022] Figure 7 Fig. 2 is a diagram showing a second example of a comparison page of a foot shape and a last.

[0023] Figure 8 Fig. 3 is a flowchart showing a procedure of a shoe fit evaluation process in the second embodiment.

[0024] Figure 9 Fig. 4 is a diagram showing a screen example of a first product detail page in the second embodiment.

[0025] Figure 10 Fig. 5 is a diagram showing a screen example of a second product detail page in the second embodiment.

[0026] Figure 11 Fig. 6 is a functional block diagram showing each structure of a shoe fit evaluation system in the second embodiment.

[0027] Figure 12 Fig. 7 is a diagram showing a relationship between a heel width ratio and a correction value for each foot girth type in the second embodiment.

[0028] Figure 13 Fig. 8 is a flowchart showing a calculation algorithm of the correction value C1.

[0029] Symbol Explanation

[0030] 10 - person to be measured, 20 - foot shape, 21 - foot shape foot length, 22 - foot shape girth, 23 - foot shape arch circumference, 24 - foot shape heel circumference, 25 - foot shape heel width, 30 - last, 31 - last foot length, 32 - last girth, 33 - last arch circumference, 34 - last heel circumference, 35 - last heel width, 50 - shoe fit evaluation server, 54 - measured value acquisition section, 60 - storage section, 64 - last storage section, 68 - measured value storage section, 72 - size difference calculation section, 74 - evaluation processing section, 80 - output section, 100 - shoe fit evaluation system, 133 - last fit rate. DETAILED DESCRIPTION

[0031] Hereinafter, the present application will be described based on preferred embodiments with reference to the drawings. In the embodiments and modified examples, the same or equivalent constituent elements are denoted by the same symbols, and repeated description is appropriately omitted.

[0032] (First Embodiment)

[0033] Figure 1The basic structure of the shoe fit evaluation system 100 is shown. The shoe fit evaluation system 100 mainly includes an information terminal 16 and a shoe fit evaluation server 50. Here, "shoes" are mainly running shoes and walking shoes, but can include other types of shoes. The person to be measured 10 scans the shape of his or her foot using a three-dimensional foot shape measuring instrument 18 provided at a shoe store. Alternatively, the person to be measured 10 places his or her foot on a measuring mat 12 and scans the shape of his or her foot by photographing the foot using the camera function of the information terminal 16 and measurement in a foot shape measurement application. Alternatively, the length and girth of the foot of the person to be measured 10 are measured manually using a tape measure 14 or the like, and the measured values are input to the information terminal 16. The three-dimensional foot shape measuring instrument 18 acquires three-dimensional data related to the shape of the foot of the person to be measured 10 by laser measurement. The "foot shape" described here is a three-dimensional model that hypothetically reproduces the three-dimensional shape of the foot of the person to be measured 10. The information terminal 16 can also generate the shape of the foot of the person to be measured 10 by a three-dimensional scanning function using a technology such as LiDAR (Light Detection And Ranging), an image synthesis process such as photogrammetry, or the like.

[0034] The shoe fit evaluation system 100 can also include the measuring mat 12 and the three-dimensional foot shape measuring instrument 18. The information terminal 16 can be operated by the person to be measured 10 himself or herself as a user, or the scanning of the foot shape can be performed by a person other than the person to be measured 10, such as a shop clerk at a shoe store, using the three-dimensional foot shape measuring instrument 18 or the information terminal 16. Therefore, the information terminal 16 can be a terminal owned by a shoe store provided with the three-dimensional foot shape measuring instrument 18, or can be a terminal owned by the person to be measured 10 himself or herself.

[0035] The measured values of the three-dimensional measurement results of the foot shape scanned by the three-dimensional foot shape measuring instrument 18 or the information terminal 16 are transmitted from the information terminal 16 to the shoe fit evaluation server 50. In addition, the "shoe fit evaluation device" described in the technical solution can refer to the entire shoe fit evaluation system 100, or can refer to the shoe fit evaluation server 50. Also, in the present embodiment, most of the characteristic functions of the "shoe fit evaluation device" described in the technical solution are implemented in the form of having the shoe fit evaluation server 50, and therefore, in essence, the shoe fit evaluation server 50 corresponds to the "shoe fit evaluation device". Among them, the characteristic functions of the "shoe fit evaluation device" can be distributed to the information terminal 16 and the shoe fit evaluation server 50, or can be implemented in a form in which the information terminal 16 has most of the functions thereof.

[0036] The shoe fit evaluation server 50 is a server computer connected via a network line such as the Internet, a LAN (Local Area Network), or the like, and a communication method such as wireless communication, between a plurality of information terminals 16. The shoe fit evaluation server 50 can be composed of a single server computer, or can be composed of a combination of a plurality of server computers. The information terminal 16 can be a mobile information terminal such as a smartphone or a tablet terminal, or can be a personal computer.

[0037] Figure 2 The correspondence between the foot shape of the measurement target person and the parts in the last is schematically shown. In the present embodiment, the fit of the foot shape to the shoe of the evaluation target is evaluated based on the dimensional difference between the foot shape and the plurality of foot parts corresponding to each other in the last. Figure 2 (a) of FIG. 1 schematically shows a three-dimensional model of a foot shape. Figure 2 (b) of FIG. 1 schematically shows a three-dimensional model of a last. The plurality of foot parts described herein are foot length, girth, heel width, arch circumference, and heel circumference, but in the present embodiment, the dimensional difference between the foot length and the girth and the measured value of the heel width are referred to in evaluating the fit of the foot shape to the shoe. Among them, in a modified example, any one or more of the girth, the heel width, the arch circumference, and the heel circumference can be referred to in combination with the foot length in the evaluation of the fit. Hereinafter, in the present drawings, the plurality of foot parts including the foot length, the girth, the heel width, the arch circumference, and the heel circumference are described.

[0038] The foot shape 20 is a three-dimensional model that is hypothetically reproduced by the three-dimensional foot shape measuring instrument 18 and the information terminal 16 scanning the shape of the foot of the measurement target person 10. Among them, the foot shape 20 does not necessarily faithfully reproduce the shape of the foot of the measurement target person 10, especially the shape around the toes, and is intentionally constructed from a deformed shape so as to be easily compared with the last 30. Based on the generated three-dimensional model of the foot shape, the foot shape foot length 21, the foot shape girth 22, the foot shape arch circumference 23, the foot shape heel circumference 24, and the foot shape heel width 25 can be measured. The foot shape foot length 21, the foot shape girth 22, the foot shape arch circumference 23, the foot shape heel circumference 24, and the foot shape heel width 25 are parts corresponding to the foot length, the girth, the arch circumference, the heel circumference, and the heel width of the foot of the measurement target person 10, respectively.

[0039] The last 30 is a three-dimensional model that hypothetically reproduces a plurality of last models of shoes prepared in advance as options of recommended shoes. Shoes are sometimes prepared in a plurality of products, and also in a product model of one kind, expansion of sizes corresponding to a plurality of foot lengths, a plurality of foot widths, and also in a case where shapes for men and women are prepared differently. A different last is used with respect to each of the plurality of shoes. The last is a last that is assumed for each shoe model as an ideal foot shape, and is actually used as a last in a shoemaking process. In the shoemaking process, an upper and a sole are bonded in a manner of wrapping the last, and then the last is pulled out, thereby manufacturing a shoe. For each shoe model, how the last is set in shape and size, and how to set the stretch properties and the allowance of each part of the shoe with respect to the last reflect the design idea and the skill of the product, and are generally not disclosed to the outside of the footwear manufacturer. In the shoe fit evaluation server 50 described below, reference values for fit determination based on such a design idea and skill are set in advance.

[0040] In the three-dimensional model of the last, values showing the last foot length 31, the last foot girth 32, the last foot arch circumference 33, the last heel circumference 34, and the last heel width 35 are prepared in advance. The last foot length 31, the last foot girth 32, the last foot arch circumference 33, the last heel circumference 34, and the last heel width 35 are parts corresponding to the foot shape foot length 21, the foot shape foot girth 22, the foot shape foot arch circumference 23, the foot shape heel circumference 24, and the foot shape heel width 25, respectively. Therefore, a foot length size difference is calculated between the foot shape foot length 21 and the last foot length 31, and a foot girth size difference is calculated between the foot shape foot girth 22 and the last foot girth 32. Also, a foot arch circumference size difference is calculated between the foot shape foot arch circumference 23 and the last foot arch circumference 33, a heel circumference size difference is calculated between the foot shape heel circumference 24 and the last heel circumference 34, and a heel width size difference is calculated between the foot shape heel width 25 and the last heel width 35.

[0041] Figure 3 is a functional block diagram showing the functions of each structure of the shoe fit evaluation system 100. The shoe fit evaluation system 100 in the present embodiment is constituted by the information terminal 16 and the shoe fit evaluation server 50. Among them, the shoe fit evaluation system 100 is considered to be realized by various hardware configurations and software configurations. For example, the shoe fit evaluation system 100 can be constituted only by the shoe fit evaluation server 50, or can be constituted only by the information terminal 16.

[0042] Figure 3In the above, with respect to the information terminal 16 and the shoe fit evaluation server 50, functional blocks realized by cooperation of various hardware configurations and software configurations are respectively depicted. Therefore, it should be understood by those skilled in the art that the above functional blocks can be realized in various forms by hardware only, software only, or a combination thereof. The information terminal 16 is constituted by a combination of hardware such as a camera module, a distance measuring sensor, a microprocessor, a touch panel, a memory, a communication module, and the like. The information terminal 16 can be a general-purpose information terminal such as a smartphone, a tablet terminal, and the like prepared by the measuring target person 10 or a shoe store. Among them, by mounting a program having the following functions on the information terminal 16, or by accessing a website provided by the shoe fit evaluation server 50 via a web browser, the following functions are substantially exerted by cooperation of software and hardware. The information terminal 16 includes the optical information acquisition section 40, the scanning processing section 41, the operation input section 42, the model generation section 43, the information generation section 44, the part measurement section 45, the display section 46, and the communication section 47 as its functions.

[0043] In a case where a three-dimensional model is generated using a LiDAR technique, the optical information acquisition section 40 is constituted by a LiDAR sensor on the hardware. In this case, the optical information acquisition section 40 detects laser light, and the scanning processing section 41 performs distance measurement on the target object based on information acquired from the optical information acquisition section 40, thereby scanning a three-dimensional shape of the foot of the measuring target person 10. The model generation section 43 generates a three-dimensional model of the foot shape based on information scanned by the scanning processing section 41.

[0044] In a case where a three-dimensional model is generated using a photogrammetry technique, the optical information acquisition section 40 is constituted by a camera module on the hardware. In this case, the optical information acquisition section 40 photographs the foot of the measuring target person 10 from the surroundings, and the scanning processing section 41 acquires a moving image or a plurality of still images as images of the foot, thereby scanning a three-dimensional shape of the foot of the measuring target person 10. The model generation section 43 generates a three-dimensional model of the foot shape based on information scanned by the scanning processing section 41.

[0045] In a case where a three-dimensional model is generated using the three-dimensional foot shape measuring instrument 18, the model generation section 43 acquires information scanned by the three-dimensional foot shape measuring instrument 18 via the communication section 47, and generates a three-dimensional model of the foot shape based on the acquired information.

[0046] The site measurement section 45 measures the foot shape, foot length 21, foot girth 22, foot arch circumference 23, foot heel circumference 24, and foot heel width 25 in the three-dimensional model generated by the model generation section 43. The information generation section 44 generates screen display content for displaying the three-dimensional model generated by the model generation section 43 and the measurement values measured by the site measurement section 45 on the screen of the information terminal 16. Also, the information generation section 44 generates information of the three-dimensional model and the measurement values, identification information for identifying the measurement target person 10, attribute information, information for determining the preference of the shoe of the measurement target person 10, and the like, and transmits them to the shoe fit evaluation server 50 via the communication section 47. The display section 46 displays the display content generated by the information generation section 44 and the display content received from the shoe fit evaluation server 50 on the screen of the information terminal 16.

[0047] The shoe fit evaluation server 50 is configured by, for example, a combination of a microprocessor, a memory, a display, a communication module, and the like. The shoe fit evaluation server 50 can be a server computer constructed and managed by a shoe manufacturer. In the shoe fit evaluation server 50, a program having the following functions is executed. The shoe fit evaluation server 50 includes, as its functions, a communication section 52, a measurement value acquisition section 54, a storage section 60, a fit evaluation section 70, and an output section 80. The communication section 47 of the information terminal 16 and the communication section 52 of the shoe fit evaluation server 50 are connected via the network 90.

[0048] The measurement value acquisition section 54 acquires, as foot shape dimension information that specifies the foot shape of the measurement target person 10, measurement values of the dimensions of a plurality of foot sites including at least the foot length from the information terminal 16 via the communication section 52. The measurement value acquisition section 54 of the present embodiment acquires measurement values of the foot length, the foot girth, and the foot heel width, but in a modified example, measurement values of any one or more or all of the foot girth, the foot arch circumference, the foot heel circumference, and the foot heel width in combination with the foot length can be acquired.

[0049] The storage section 60 includes a user storage section 62, a last storage section 64, and a shoe information storage section 66. The user storage section 62 stores identification information and attribute information for specifying the measurement target person 10, which is transmitted from the information terminal 16. The last storage section 64 stores, for each of a plurality of kinds of lasts, as last size information for specifying a last, sizes of last portions corresponding to a plurality of foot portions including at least a foot length. The last storage section 64 of the present embodiment stores, for each last, sizes of a last foot length and a last girth as a plurality of last portion sizes, but in a modified example, sizes of any one or more or all of a last girth, a last arch circumference, a last heel circumference, and a last heel width in combination with a last foot length can be stored. The shoe information storage section 66 stores information of a plurality of models and a plurality of sizes of shoes. The plurality of models include a male model and a female model. The sizes of shoes include sizes of a plurality of foot lengths and sizes of a plurality of foot widths. The shoe information includes various adjustment values (details are described below) that are set in advance for each last or for each shoe.

[0050] The suitability evaluation section 70 includes a last selection section 71, a size difference calculation section 72, and an evaluation processing section 74. The last selection section 71 selects any one or more of the plurality of lasts stored in the last storage section 64 as an evaluation target. For example, the last selection section 71 selects, as an evaluation target, one or more of a last of a shoe that can be worn with a foot having a foot size measured by the foot size measurement section 52 or a last of a shoe having a size close to the foot size, based on information of preferences input by an operator of the information terminal 16 and the measured value of the foot size. In order to select a shoe most suitable for the foot of the measurement target person 10 from a wide range of options, it is preferable for the last selection section 71 to select a plurality of lasts as evaluation targets. Furthermore, in a modified example, instead of the last selection section 71 selecting a plurality of lasts as evaluation targets in advance, it is also possible to select substantially all of the lasts stored in the last storage section 64 as evaluation targets. In this case, the size difference calculation section 72 and the evaluation processing section 74 calculate the portion size difference and the last suitability rate with all of the lasts as evaluation targets. In contrast, in the present embodiment, in order to avoid calculating the portion size difference and the last suitability rate with all of the lasts as targets, it is configured to calculate the portion size difference and the last suitability rate in a state where the evaluation targets are narrowed down to some extent in particular in accordance with the measured values of the foot length and the girth, the preferences and the attributes of the measurement target person 10, so as to suppress the calculation load. Hereinafter, the size difference between the last selected by the last selection section 71 and the foot shape acquired by the measurement value acquisition section 54 is calculated.

[0051] The size difference calculating section 72 calculates the difference between the measured value of the foot part size and the last part size corresponding to the foot part, i.e., the part size difference, in a form of performing a predetermined adjustment corresponding to the part. The evaluation processing section 74 calculates the last suitability rate based on the part size difference. Hereinafter, the calculation method of the part size difference and the last suitability rate will be described in detail.

[0052] As described above, the part size difference in the present embodiment is the difference between the measured value of the foot length in the foot shape and the last foot length, and the difference between the measured value of the girth in the foot shape and the last girth. Among them, in the modification, a combination of at least any one of the part size difference of the arch circumference, the heel circumference, the heel width and the part size difference of the foot length can be used.

[0053] Here, the "predetermined adjustment" includes the following four calculations. That is, in the calculation of the part size difference, the adjustment of subtracting an allowable amount corresponding to the individual stretchability of each part of the shoe (adjustment 1), the adjustment of calculating the part size difference as the sum of squares of the part size differences after applying individual weights to each part (adjustment 2), the adjustment of applying a first weight to the part size difference of the foot length and a second weight smaller than the first weight to the part size differences other than the foot length, and calculating the sum of squares of the resulting part size differences (adjustment 3), and the adjustment of using, as the measured value of the foot part size, a corrected value in which an error is applied to the actually measured value of the foot part size according to the measurement method (adjustment 4). The calculation method of the last suitability rate after applying the above adjustments is shown by the following formula.

[0054] Last suitability rate = 100 - part size difference

[0055] Here, the part size difference is the sum of squares of the foot length size difference and the girth size difference, and is shown by the following formula.

[0056] Part size difference = α x foot length score + β x girth score

[0057] The "foot length score" is the value after squaring the foot length size difference, and the "girth score" is the value after squaring the girth size difference. The foot length size difference is the difference between the last foot length and the measured value of the foot length, and the girth size difference is the difference between the last girth and the measured value of the girth. Among them, since there is a case where each part of the shoe has individual stretchability, the foot length size difference and the girth size difference are calculated in a form of subtracting an allowable amount corresponding to such stretchability (adjustment 1). Therefore, the foot length score and the girth score are shown by the following formulas.

[0058] Foot length score = (last foot length - measured value of foot length - d1) 2

[0059] Girth score = (last girth - measured value of girth - d2) 2

[0060] Here, sometimes the upper is formed in a manner that the stretchability in the foot length direction of the shoe is relatively low, and the upper is formed in a manner that the stretchability in the girth direction of the shoe is relatively high. For example, d1, which is the adjustment value in the foot length direction, can be set to a small value of 1 mm or less. Also, for example, it is expected that the shoe will stretch to some extent in the girth direction, and in order to select a shoe that is slightly tight at the time of purchase, a large value of several mm or more, which is equivalent to 2 to 3% of the girth, can be set to d2. Therefore, the values of d1 and d2 can be set in a manner that d1 < d2. In addition, d1 and d2 can also be set to negative values, respectively. d1 and d2 can be set for each last, i.e., model and size of the shoe. d1 and d2 can also be set to values that are adjusted in advance in order to obtain a result equivalent to the case where a shoemaker selects a shoe.

[0061] In addition, the last is not necessarily made in a manner that completely reproduces the shape of a person's foot, and as a design idea for improving the functionality of the shoe, sometimes the last is given a characteristic shape that intentionally differs from the shape of a person's foot. Also, in order to prevent the tip of the foot from frequently hitting the inner end portion of the shoe when walking, a design in which a surplus called "discard size (tip allowance)" is provided as a tip space is more common. Also, in the case of a shoe for an outdoor runner who runs on uneven ground, a road surface with large undulations, in order to make it difficult for the tip of the foot to frequently hit the shoe, sometimes a shoe with a larger discard size compared to a normal shoe is preferred. Also, depending on the classification, model of the shoe, the raw material of the upper, its thickness is sometimes different. In this way, as a difference in the dimensions of the parts, a difference based on the design idea, the characteristics of the shoe is also anticipated, and therefore d1 and d2 can also be set as adjustment values based on such a difference in design.

[0062] The part size difference is calculated as the sum of squares of the part size difference after applying individual weights α, β to each part (adjustment 2). That is, the foot length fraction is multiplied by the weight coefficient α, and the girth fraction is multiplied by the weight coefficient β. In measuring the fit of a shoe, the foot length is considered to be the most influential element among the plurality of foot parts, and therefore, in calculating the last suitability rate, relatively large weighting is performed in the evaluation of the foot length, and relatively small weighting is performed in the evaluation of the girth (adjustment 3). For example, in a case where the weight coefficient α is set to 0.8 and the weight coefficient β is set to 0.2, in a case where the weight coefficient α is set to 0.6 and the weight coefficient β is set to 0.4, and the like, the weight coefficient α is set to 0.6 to 0.8, and the weight coefficient β is set to 0.4 to 0.2, which is smaller than the weight coefficient α. The weight coefficients α, β are stored in the shoe information storage section 66, and different values can be set for each shoe model and size. The weight coefficients α, β can also be set to values adjusted in advance so as to obtain a result equivalent to the case where a shoemaker selects a shoe. Furthermore, as a modification, the arch circumference fraction, the heel circumference fraction, and the heel width fraction can also be calculated based on the arch circumference size difference, the heel circumference size difference, and the heel width size difference, and the part size difference can be calculated by applying individual weighting to the squares of the respective fractions.

[0063] As the measured value of each foot part, a corrected value in which an error is applied to the actually measured value of the foot part size according to the measurement method is used (adjustment 4). For example, in a case where the last size stored in the last storage section 64 is designed assuming that the foot part size is manually measured using a measuring instrument such as a tape measure 14, in measurement using the laser ranging of the three-dimensional foot shape measuring instrument 18 and the information terminal 16, it is possible that an error occurs from manual measurement (for example, the laser ranging is considered to be a slightly smaller measured value). Therefore, in a case where it is not a manually measured value, in order to conform to the design idea of the last, for example, a value obtained by adding an error correction amount of about 2 to 3 mm to the actually measured value of the foot length size and the girth size, respectively, can be used as the measured value of the foot part size. Also, in manual measurement, in order to reflect the characteristic that the girth is more tightly wound around the tape than the foot length, and is therefore likely to be smaller than the actual girth, the error correction amount of the girth size can be made larger than the error correction amount of the foot length size.

[0064] Here, in a case where the ratio of the measured value of the heel width dimension to the measured value of the foot length dimension (heel width ratio) is a predetermined ratio (for example, about 1 / 4) or more, it is assumed that the upper limit value of the ideal heel width in the last is exceeded, and the heel is difficult to fit into the heel portion of the shoe. In this case, the heel does not fit into the shoe, and accordingly the foot easily moves forward at the time of walking or the like, the toe space is lost, and this can become a cause of feeling that the shoe is tight. Therefore, in a case where the heel width is a predetermined ratio or more, the value obtained by adding a predetermined size increase adjustment value (for example, 4 to 5 mm) to the measured value of the foot length dimension can also be used as the measured value of the foot length dimension, with the aim of recommending an increase of one size in the shoe. The error correction amount and the size increase adjustment value are stored in the shoe information storage section 66, and different values can be set in accordance with the model and size of the shoe. The error correction amount and the size increase adjustment value can also be set to values that are adjusted in advance so as to obtain a result equivalent to the case where the shoemaker selects the shoe.

[0065] The evaluation processing section 74 calculates the last suitability rate for each of a plurality of lasts that are evaluation targets. The evaluation processing section 74 selects at least one shoe corresponding to a last for which the last suitability rate is relatively large, from among the options of a plurality of shoes. In this way, the last suitability rate is calculated on the basis of the difference in the dimensions of the parts obtained by comparing the measured values of the parts of the foot with the dimensions of the parts of the last, and the best shoe is selected on the basis of the last suitability rate, so that a shoe having a medial shape that is highly compatible with the shape of the foot can be selected. Since the last suitability rate is calculated on the basis of values that correctly reflect the dimensions of the parts of the last and the characteristics of each shoe or each last, the selection accuracy of a shoe that fits the foot can be improved. Furthermore, since various adjustment values can be set for each shoe or each last, a shoe selection method that more faithfully reflects the expertise and skills of a shoemaker can also be reproduced.

[0066] The output section 80 transmits information related to the last suitability rate to the information terminal 16 via the communication section 52, so that shoe recommendation information including the last suitability rate is displayed on the screen of the information terminal 16. The output section 80 includes a recommendation output section 82 and a comparison output section 84. The recommendation output section 82 outputs information showing the shoe selected by the evaluation processing section 74 and the last suitability rate for the last of the shoe, as recommendation information. The comparison output section 84 outputs information that visually shows the comparison result of the dimensions of the parts of the last of the shoe selected by the evaluation processing section 74 and the dimensions of the parts of the foot. The details of the screen display examples of the recommendation information and the comparison result are described below.

[0067] Figure 4is a flowchart showing a procedure of the shoe fit evaluation process. When the shoe fit evaluation process is started, the measurement value acquisition section 54 acquires the measurement values of the foot part sizes (S10), and the last selection section 71 selects the last to be evaluated (S12). The size difference calculation section 72 identifies which measurement method the measurement of the foot part sizes is (S14), and adjusts the measurement values of the foot part sizes according to the measurement method for error correction (S16). The size difference calculation section 72 adjusts the part size differences according to the characteristics of each part (S18), and the evaluation processing section 74 calculates the last fit rate based on the part size differences (S20). The recommendation output section 82 outputs information of the shoe and the last fit rate (S22), and the comparison output section 84 outputs comparison information of the foot shape and the last (S24), and the shoe fit evaluation process is exited. Note that the processes of S10 to S24 are executed in various orders, and the order of S10 to S24 in the flowchart of this figure is merely an order determined for convenience. Also, from the last selection process of S12 to the output processes of S22 and S24, the processes can be repeated a plurality of times while changing the shoe to be evaluated until a shoe most suitable for the measurement target person 10 is found.

[0068] Figure 5 A screen example showing the recommendation information of the shoe. In the screen 110 displayed on the information terminal 16, the recommendation information generated by the evaluation processing section 74 based on the shoe and the last fit rate selected is displayed. The screen 110 is mainly composed of a first tab screen 112, a second tab screen 114, a third tab screen 116, and a fourth tab screen 118, and displays any one of the first tab screen 112, the second tab screen 114, the third tab screen 116, and the fourth tab screen 118 selected by the operator. For example, the category "PROTECT" of the first tab screen 112 corresponds to a shoe for beginners aiming to complete a marathon to a wide range of runners who want to run daily. The category "ENERGY" of the second tab screen 114 corresponds to a shoe for runners of various levels who want to run for a long time easily. The category "SPEED" of the third tab screen 116 corresponds to a shoe for runners who pursue speed such as athletes and marathon advanced runners. The category "TRAIL" of the fourth tab screen 118 corresponds to a shoe for outdoor runners who run on uneven ground or a road with ups and downs. The operator can select the category of the favorite shoe by selecting any one of the tab screens.

[0069] In the illustrated screen 110, as shoes corresponding to the category "protection", information of four kinds of shoes recommended is displayed in the first recommendation column 120, the second recommendation column 122, the third recommendation column 124, and the fourth recommendation column 126, respectively. For example, in the first recommendation column 120, a shoe image 130, a product name 131, size information 132, a last suitability 133, a comparison button 134, and a detail button 135 are displayed. The shoe image 130 visually shows the appearance of the recommended shoe. The product name 131 is the model name of the shoe "GK-29 Women's Wide", which includes an identification name for distinguishing which model for men and women, which foot width model. The size information 132 is a string showing the last foot length of "24.5 cm". Here, as the length unit of the product model expands, it can be either centimeters or inches, so it does not need to strictly match the actual last foot length.

[0070] In the last suitability 133, the value of the last suitability calculated by the evaluation processing section 74 is displayed in the form of the string "Match 98%". The comparison button 134 is a link button to a comparison page for comparing the foot shape and the last, and when the operator presses the comparison button 134, the screen switches to the comparison page of the foot shape and the last. The detail button 135 is a link button to a product introduction page that introduces the shoe model recommended in the first recommendation column 120 in detail, and when the operator presses the detail button 135, the screen switches to the product introduction page.

[0071] In the second recommendation column 122, the third recommendation column 124, and the fourth recommendation column 126, the shoe image, the product name, the size information, the last suitability, the comparison button, and the detail button are also displayed as in the first recommendation column 120, and the last suitability of each shoe model recommended is prompted, and the products can be compared with each other as a reference for purchase.

[0072] Figure 6 A first example of a comparison page of the foot shape and the last is shown. In the screen 140 displayed by the information terminal 16, left and right foot shape images 141 are displayed, and left and right shoe images 142 are displayed in a manner overlapping the foot shape images 141. Figure 6 Here, the outline of the shoe is shown by a dotted line as the shoe image 142 for convenience, but the image of the actual shoe can also be displayed in a semi-transparent manner on the foot shape image 141, so that the positional relationship and the size difference between the foot shape image 141 and the shoe image 142 become more clear.

[0073] A left foot length difference area 143 is an area display showing the excess degree of the left foot in the foot length direction, and a pattern or a color showing that the left foot length size difference is an appropriate size is applied to the area. As a left foot length suitability display 144 showing the size of the left foot length size difference in words, a string showing that the left foot length size difference is an appropriate size, "Recommended", is displayed.

[0074] The right foot length difference area 145 is an area display showing the excessiveness in the foot length direction of the right foot, and a pattern or color showing that the right foot length dimension is too small is applied to the area. As the right foot length fitness display 146 showing the size of the right foot length dimension difference in words, a string "snug" showing that the right foot length dimension is too small is displayed.

[0075] The left foot girth difference area 147 is an area display showing the excessiveness in the foot girth direction of the left foot, and a pattern or color showing that the left foot girth dimension is slightly large is applied to the area. As the left foot girth fitness display 148 showing the size of the left foot girth dimension difference in words, a string "loose" showing that the left foot girth dimension is slightly large is displayed.

[0076] The right foot girth difference area 149 is an area display showing the excessiveness in the foot girth direction of the right foot, and a pattern or color showing that the right foot girth dimension is too small is applied to the area. As the right foot girth fitness display 150 showing the size of the right foot girth dimension difference in words, a string "snug" showing that the right foot girth dimension is too small is displayed.

[0077] As described above, by visually expressing the difference in foot shape and the last in words, colors, patterns, and the like, the subject person 10 can intuitively grasp whether the shoe fits.

[0078] Figure 7 A second example of a comparison page of a foot shape and a last. In a screen 160 displayed by the information terminal 16, left and right foot shape images 162 are displayed in the form of three-dimensional models, and a last image 164 is displayed in the form of a wire frame of a three-dimensional shape around the three-dimensional model of the foot shape. That is, the foot shape of the subject person 10 is displayed in three dimensions in a form of wearing a recommended shoe. A string "24.5 cm" showing the size of the foot length and a string "widened" showing the type of the foot width are displayed in recommendation information 166. In addition, a value of the last fitness rate can also be displayed.

[0079] As described above, by visually expressing the difference in foot shape and the last, the fitness in three-dimensional space, the subject person 10 can intuitively grasp whether the shoe fits.

[0080] (Second Embodiment)

[0081] In the second embodiment, as the reference values for evaluating the foot shape and the shoe fit, not only the measured values of the foot length, the girth, and the heel width, but also the arch circumference, the toe shape, and the heel circumference are referred to for calculating the fit, unlike the first embodiment. Also, in the second embodiment, the fit of the foot shape is calculated for the shoe selected by the user, unlike the first embodiment in which the shoe that fits the foot shape is extracted and presented to the user. Hereinafter, the description will be focused on the differences from the first embodiment, and the commonalities will be omitted.

[0082] Figure 8 Fig. 19 is a flowchart showing the procedure of the shoe fit evaluation process in the second embodiment. In the second embodiment, it is assumed that when the measured values of the foot shape of the person 10 to be measured are acquired by the three-dimensional foot shape measuring instrument 18 or the like, the measured values are transmitted to the shoe fit evaluation server 50, and are stored in advance in the shoe fit evaluation server 50 in correspondence with the identification information of the person 10 to be measured. Further, in a modified example, the measured values of the foot shape of the person 10 to be measured can not be acquired in advance by the three-dimensional foot shape measuring instrument 18 or the like. In this case, the user himself / herself can also input the information of the foot length and the girth by text input or the like as the measured values of the foot shape, and the input information is stored in the shoe fit evaluation server 50 in correspondence with the identification information of the user as the measured values of the foot shape. Alternatively, it can be configured such that the measured values of the foot shape or the information of the foot length and the girth input by the user himself / herself are not stored in the shoe fit evaluation server 50 in correspondence with the identification information, but the user inputs the information of the foot length and the girth when the shoe size that fits the user's foot and the last fit rate are calculated, and the information is used for the calculation.

[0083] When the user accesses the online shoe selling website, a list of shoes on sale is displayed (S30), and when the user selects a model of shoe to be considered for purchase from the list of shoes (S32), a product detail page of the selected shoe is displayed (S34). In the product detail page of the shoe, an image of the shoe, detailed information of the shoe, and an option of shoe size are posted. Here, in a case where the user has logged in to the shoe selling website (S36: Yes), and in a case where a measured value of the user's foot has been measured in advance and saved in the shoe fit evaluation server 50 (S38: Yes), the processes of S39-S48 are executed. That is, the last selection section 71 selects one or more lasts from among the plurality of shoe sizes of the last corresponding to the model of shoe the user is considering purchasing, as evaluation target lasts, the one or more lasts having a foot length close to the user's foot length (S39). The size difference calculation section 72 identifies which measurement method was used to measure the user's foot part size (S40), and adjusts the measured value of the foot part size according to the measurement method to perform error correction (S42). The size difference calculation section 72 adjusts the part size difference according to the characteristics of each part (S44), and the evaluation processing section 74 calculates the last fit rate based on the part size difference (S46). The recommendation output section 82 displays the shoe size with the highest last fit rate and the last fit rate thereof (S48).

[0084] In a case where the user has not logged in to the shoe selling website (S36: No), or in a case where the measured value of the foot has not been measured in advance (S38: No), the processes of S39-S48 are skipped. Further, an example is described in which, in a case where the user has logged in, after the user has selected a model of shoe from the list of shoes as in S32, the shoe size with a higher last fit rate and the last fit rate thereof are displayed in the product detail page of the shoe. In a modified example, the last fit rate of each model of shoe can be calculated as in S36-S48 before the display of the list of shoes in S32, and the shoe size with a higher last fit rate and the last fit rate thereof can be displayed according to each model of shoe at the stage of the display of the list of shoes in S32.

[0085] Figure 9 A screen example of a first product detail page in the second embodiment is shown. The first product detail page is a product detail page displayed in a case where the user has not logged in to the product selling website. In the screen 200, detailed information of the shoe is displayed, and a link button 202 on which "Log in / Member registration" is written is displayed at the upper right of the screen 200. The link button 202 links to a page for logging in or member registration, indicating that the user who is viewing the product detail page has not logged in or registered as a member. If the user presses the link button 202, the page for logging in or member registration is displayed.

[0086] In the first product detail page, in addition to the product name, product image, detailed explanation, the evaluation information for the product is also displayed in the screen 200. As options for the color of the shoes, a plurality of color selection buttons are displayed. If any of the color selection buttons is pressed, the pressed selection button is displayed in an emphasized state as a selection state, and a shoe image in the selected color is displayed. In the girth size display field 207, which girth size of the shoes being displayed is displayed.

[0087] In the shoe size selection field 208, a plurality of size buttons are displayed as options for a plurality of shoe sizes. If any of the size selection buttons is pressed, the pressed selection button is displayed in an emphasized state as a selection state. The shoe size recommendation field 209 is a field in which a shoe size suitable for the user's foot and a last suitability rate are displayed. In this case, in a state where the user is not logged in, the measured value of the user's foot is not clear, and thus the shoe size suitable for the user's foot and the last suitability rate are not displayed.

[0088] Figure 10 A screen example of a second product detail page in the second embodiment is shown. The second product detail page is a product detail page displayed in a state where the user has logged in to the product selling website. In the screen 200, the detailed information of the shoes is displayed in the same manner as the screen 200 of the first product detail page shown in Figure 9 In the screen 200 of the second product detail page, the link button 202 is not displayed, and a link button 210 showing a user name and a "log out" string is displayed in the upper right of the screen 200 instead. The link button 210 links to a page for logging out, and shows that the user viewing the product detail page is logged in.

[0089] In the case where the user is logged in, based on the measured value of the user's foot, the last suitability rate is calculated based on the difference in the part size between the lasts of a plurality of shoe sizes. In the case where the shoe size with the highest last suitability rate is, for example, "26.5 cm", the selection button showing "26.5 cm" is displayed in a different color from the other buttons in the shoe size selection field 208, and it is suggested that this is the most suitable for the user's foot. In the shoe size recommendation field 209, the shoe size most suitable for the user's foot is displayed as "26.5 cm" in the form of a string, and the last suitability rate is displayed as "89.2%". Furthermore, in the other size information field 211 displayed below the shoe size recommendation field 209, the last suitability rates for the previous shoe size and the next shoe size are displayed as information related to the other shoe sizes.

[0090] Figure 11 is a functional block diagram showing the functions of each structure of the shoe suitability evaluation system 100 in the second embodiment. The storage section 60 in the second embodiment further includes a measured value storage section 68 that stores the measured values of a plurality of foot part sizes acquired from the information terminal 16 in correspondence with the identification information of the measurement target person 10.

[0091] The last selection section 71 selects one or more lasts corresponding to the shoe model selected by the user from among the plurality of lasts stored in the last storage section 64 as evaluation targets. The last selection section 71 selects one or more lasts of a shoe size that can be worn by a foot of the measured value of the user's foot size and a girth size or a size close to the foot size as evaluation targets, based on the measured value of the user's foot size. Further, the last is designed and stored individually with respect to a plurality of sizes of a plurality of models. The plurality of sizes described herein include a plurality of shoe sizes as sizes in the foot length direction and a plurality of girth sizes as sizes in the foot width direction. One or more girth sizes are designed with respect to one shoe size. Whether a plurality of girth sizes are designed for one shoe size differs depending on the shoe model.

[0092] With respect to the last selected by the last selection section 71, the size difference calculation section 72 calculates the difference between the measured value of the foot part size and the last part size corresponding to the foot part, that is, the part size difference, in a form in which a predetermined adjustment corresponding to the part is made. With respect to the last selected by the last selection section 71, the evaluation processing section 74 calculates the last fitness rate based on the part size difference. Hereinafter, the calculation method of the part size difference and the last fitness rate in the second embodiment will be described in detail.

[0093] Here, the "predetermined adjustment" includes the following four calculations as in the first embodiment. That is, in the calculation of the part size difference, an adjustment of subtracting an allowable amount corresponding to the individual stretchability of each part in the upper of the shoe (adjustment 1), an adjustment of calculating the part size difference as the sum of squares of the part size differences after applying individual weights to each part (adjustment 2), an adjustment of applying a first weight to the part size difference of the foot length and a second weight smaller than the first weight to the part size difference other than the foot length, and calculating the sum of squares of the resulting part size differences (adjustment 3), and an adjustment of using a corrected value in which an error is applied according to the measurement method to the measured value of the foot part size as the measured value of the foot part size (adjustment 4). The calculation method of the last fitness rate after applying the above adjustments is shown by the following formula.

[0094] Last fitness rate = 100 - part size difference

[0095] The "individual stretchability" described herein refers to the characteristics of the stretchability of the upper of the shoe. The upper is composed of mesh, artificial leather, or the like, and the rigidity of each part is different, so the stretchability of each part corresponding to the raw material and the structure of the upper is taken into account in the calculation of the part size difference. Even if two shoes are manufactured using the same last, if the raw material and the structure of each upper are different, the stretchability is different, so adjustment 1 can be implemented as needed according to the difference in stretchability.

[0096] Further, "individual weight" means that, since the rigidity distribution within the upper of the shoe is not necessarily constant in each shoe model, in order to adjust the degree of influence of each part on the last fitting rate, adjustment 2 is performed on the calculation value by weighting.

[0097] Further, in the second embodiment, adjustment 4 in which the adjusted value adjusted by adjustment 4 is stored in the measurement value storage 68 as the measurement value of the foot part size of the user can also be performed in advance in the predetermined adjustment (adjustment 1 to 4) corresponding to the foot part in the calculation of the part size difference, using the corrected value to which an error is applied according to the measurement method. In this case, the measurement value stored in the measurement value storage 68 has already been subjected to adjustment 4, and thus adjustment 4 is not performed when evaluating the last fitting for the user's foot in the shoe model selected by the user.

[0098] In the second embodiment, the size difference calculation section 72 and the evaluation processing section 74 calculate the last fitting rate based on the part size difference by calculating the size score and the girth score. The part size difference is the square sum of the size score based mainly on the foot length size difference and the girth score based mainly on the girth size difference, and is shown by the following formula.

[0099] Part size difference = a x size score + β x girth score

[0100] "α" is a weight coefficient multiplied by the size score, and corresponds to "the first weight" in the first embodiment and the technical solution. "β" is a weight coefficient multiplied by the girth score, and corresponds to "the second weight" in the first embodiment and the technical solution. The size score substantially corresponds to "the foot length score" in the first embodiment. The girth score substantially corresponds to "the girth score" in the first embodiment.

[0101] The size score is a value calculated based on the measurement results of the foot length, the heel width, the heel circumference, and the toe shape, and is shown by the following formula.

[0102] Size score = (last foot length - foot length measurement value - adjustment value d1 + correction value C1) 2

[0103] The adjustment value d1 is the same as adjustment 1 in the first embodiment, and is an adjustment value when adjustment 1 is applied to the foot length size difference. The adjustment value d1 is an allowable amount subtracted from the foot length size difference according to the individual stretch characteristics of each part of the shoe.

[0104] The correction value C1 corresponds to the "size improvement adjustment value" described in the first embodiment, and is any one of (1) a correction value corresponding to the heel width ratio, (2) a correction value corresponding to the heel circumference ratio, (3) a correction value corresponding to the toe shape, or a value obtained by adding them. The correction value C1 is a variable value, and is set to different values depending on the girth type of the last that is an evaluation target of the size difference. The "heel width ratio" is the ratio of the heel width to the foot length (heel width ratio = heel width / foot length), and is usually a ratio of about 1 / 3 to 1 / 4. The "heel circumference ratio" is the ratio of the heel circumference to the foot length (heel circumference ratio = heel circumference / foot length), and is usually a ratio of 100% or more.

[0105] (1) The reason for adjusting the size difference of the foot length according to the heel width ratio is that the greater the heel width ratio, the more difficult it is to fit the heel into the heel portion of the shoe, and thus the entire foot is displaced toward the toe direction and the toe is easily tightened. (2) The reason for adjusting the size difference of the foot length according to the heel circumference ratio is the same as the heel width ratio, in that the greater the heel circumference ratio, the more difficult it is to fit the heel into the heel portion of the shoe, and thus the entire foot is displaced toward the toe direction and the toe is easily tightened. (3) The reason for adjusting the size difference of the foot length according to the toe shape is that, particularly in the case of the Roman foot type, the fourth toe and the fifth toe are difficult to fit into the toe portion of the shoe. In addition, the toe shape has the Greek foot type characterized by the second toe being longer, the Egyptian foot type characterized by the first toe being longer, and the Roman foot type characterized by the lengths of the toes not being greatly different, and the like. In particular, the feet of children are mostly of the Roman foot type. The toe shape can be distinguished by evaluating the lengths of the first to fifth toes or the proportions of the front ends of the toes with respect to the foot length.

[0106] (1) The correction value corresponding to the heel width ratio and (2) the correction value corresponding to the heel circumference ratio are common in that the fitting of the heel is the reason for adjustment, and thus do not need to be double-adjusted, and either correction value is given priority for adjustment. On the other hand, (3) the correction value corresponding to the toe shape is not adjustment for which the fitting of the heel is the reason, and thus can be double-adjusted as (1) + (3) or (2) + (3).

[0107] The foot girth type of the last is a type in which the size in the foot width direction of the shoe is classified, and in the second embodiment, is classified into a first type, a second type, a third type, and a fourth type. The first type is a type in which the foot width is narrower than the standard (Narrow). The second type is a type in which the foot width is the standard (Standard). The third type is a type in which the foot width is wider than the standard (Wide). The fourth type is a type in which the foot width is further wider than the Wide (Extra Wide).

[0108] The correction value C1 is set with different criteria according to which of the first type to the fourth type the foot girth type of the last is. Also, for the correction value C1, values that differ according to the heel width ratio or the heel circumference ratio, the toe shape are set as described above. In the case where the heel width ratio is equal to or greater than the predetermined heel width reference value RW, any one of the variable values, that is, the correction values CW1 to CW3, which increase in proportion to the heel width ratio, can be set. More specifically, in the case where the foot girth type is the first type, the correction value CW1 can be set as the correction value C1, in the case where the foot girth type is the second type or the third type, the correction value CW2 can be set as the correction value C1, and in the case where the foot girth type is the fourth type, the correction value CW3 can be set as the correction value C1. In the case where the heel circumference ratio is equal to or greater than the predetermined heel circumference reference value RG and the foot girth type is the second type to the fourth type, the correction value CG, which is a fixed value, can be set as the correction value C1. In this case, in the case where the heel width ratio is equal to or greater than the heel width reference value RW and the heel circumference ratio is equal to or greater than the heel circumference reference value RG, the larger value of the correction values CW1 to CW3 and the correction value CG can be set as the correction value C1. Also, in the case where the foot girth type of the last is the second type to the fourth type and the toe shape in the foot shape is the Roman foot type, the correction value C1 is added to the correction value CT.

[0109] Figure 12 The relationship between the heel width ratio and the correction value for each foot girth type in the second embodiment is shown. In the line graph of FIG. 22, of the three lines depicted from the bottom up, the first line 220 shows the foot girth type of the first type, the second line 221 shows the foot girth type of the second type and the third type, and the third line 222 shows the foot girth type of the fourth type. Figure 12

[0110] ​The first line 220 sets the correction value CW1 to the correction value C1 in a case where the girth type of the last of the evaluation target is the first type, that is, less than the standard and the heel width ratio in the foot shape is the predetermined heel width reference value RW or more. The correction value CW1 is a value that increases in proportion to the heel width ratio in a range from the first correction value 230 to the second correction value 231. In a case where the heel width ratio in the foot shape is less than the predetermined heel width reference value RW, adjustment based on the correction value C1 is not performed, or the correction value C1 is set to 0.

[0111] The second line 221 sets the correction value CW2 to the correction value C1 in a case where the girth type of the last of the evaluation target is the second type, the third type, that is, the standard or widened and the heel width ratio in the foot shape is the predetermined heel width reference value RW or more. The correction value CW2 is a value that increases in proportion to the heel width ratio in a range from the third correction value 232 to the fourth correction value 233. The increase rate of the correction value CW2 in proportion to the heel width ratio in the second line 221 is smaller than the increase rate of the correction values CW1, CW3 in proportion to the heel width ratio in the first line 220 and the third line 222.

[0112] The third line 222 sets the correction value CW3 to the correction value C1 in a case where the girth type of the last of the evaluation target is the fourth type, that is, the extra wide or more and the heel width ratio in the foot shape is the predetermined heel width reference value RW or more. The correction value CW3 is a value that increases in proportion to the heel width ratio in a range from the third correction value 232 to the fifth correction value 234.

[0113] Further, the second correction value 231 that is the upper limit value of the correction value in the first line 220 and the third correction value 232 that is the lower limit value of the correction value in the second line 221 and the third line 222 can be the same value, or can be a value that corresponds to the difference of one size in the shoe size.

[0114] Also, the correction values CW1 to CW3 corresponding to the heel circumference ratio are variable values, and in relation thereto, the correction value CG corresponding to the heel circumference ratio can be a fixed value. The value of the correction value CG corresponding to the heel circumference ratio can also be a value that corresponds to the difference of one size in the shoe size. The value of the correction value CG corresponding to the heel circumference ratio can also be the same value as the upper limit value of the correction value CW1 in the first line 220, that is, the second correction value 231. The value of the correction value CG corresponding to the heel circumference ratio can also be the same value as the lower limit value of the correction values CW2, CW3 in the second line 221 and the third line 222, that is, the second correction value 231.

[0115] Figure 13is a flowchart showing a calculation algorithm of the correction value C1. In the case where the girth type of the last of the evaluation target is not the standard or more, that is, in the case of the first type which is less than the standard, S71 is entered (NO of S70). In S71, in the case where the heel width ratio in the foot shape is the heel width reference value RW or more (YES of S71), a variable value corresponding to the heel width ratio, that is, the correction value CW1 (range from the first correction value 230 to the second correction value 231) is set as the correction value C1 (S72), and the calculation flow is ended. In the case where the heel width ratio is not the heel width reference value RW or more (NO of S71), the process of S72 is skipped, the correction value C1 is kept as 0, and the calculation flow is ended.

[0116] In the case where the girth type of the last of the evaluation target is the standard or more (YES of S70) and less than the extra wide (NO of S73), that is, in the case of the second type and the third type, S74 is entered. In S74, in the case where the heel width ratio in the foot shape is the heel width reference value RW or more (YES of S74), a variable value corresponding to the heel width ratio, that is, the correction value CW2 (range from the third correction value 232 to the fourth correction value 233) is set as the correction value C1 (S77), and S90 is entered. In the case where the heel width ratio in the foot shape is not the heel width reference value RW or more (NO of S74) and the heel circumference ratio in the foot shape is the heel circumference reference value RG or more (YES of S75), a fixed value corresponding to the heel circumference ratio, that is, the correction value CG is set as the correction value C1 (S76), and S90 is entered. In the case where the heel circumference ratio in the foot shape is not the heel circumference reference value RG or more (NO of S75), the process of S76 is skipped and S90 is entered. Further, in the case where the heel width ratio in the foot shape is the heel width reference value RW or more (YES of S74), the correction value CG corresponding to the heel circumference ratio does not become a value larger than the correction value CW2, so the processes of S75 and S76 are skipped.

[0117] In the case where the girth type of the evaluation object last is equal to or greater than the standard (S70: Yes) and equal to or greater than the extra wide (S73: Yes), that is, in the fourth type, S80 is entered. In S80, in the case where the heel width ratio in the foot shape is equal to or greater than the heel width reference value RW (S80: Yes), the variable value corresponding to the heel width ratio, that is, the correction value CW3 (range from the third correction value 232 to the fifth correction value 234), is set as the correction value Cl (S83), and S90 is entered. In the case where the heel width ratio in the foot shape is not equal to or greater than the heel width reference value RW (S80: No) and the heel circumference ratio in the foot shape is equal to or greater than the heel circumference reference value RG (S81 : Yes), the fixed value corresponding to the heel circumference ratio, that is, the correction value CG, is set as the correction value Cl (S82), and S90 is entered. In the case where the heel circumference ratio in the foot shape is not equal to or greater than the heel circumference reference value RG (S81 : No), the processing of S82 is skipped, and S90 is entered. Further, in the case where the heel width ratio in the foot shape is equal to or greater than the heel width reference value RW (S80: Yes), the correction value CG corresponding to the heel circumference ratio does not become a value larger than the correction value CW3, and thus the processing of S81 and S82 is skipped.

[0118] In S90, that is, after the correction value is calculated in the case where the girth type of the last is equal to or greater than the standard, in the case where the toe shape is the Roman toe type (S90: Yes), a fixed value, that is, the correction value CT, is added to the correction value Cl (S91), and the calculation flow ends. In the case where the toe shape is not the Roman toe type (S90: No), the processing of S91 is skipped, and the calculation flow ends.

[0119] The girth score is a value calculated based on the measurement results of the girth and the arch circumference, and is shown by the following formula.

[0120] Girth score = (last girth - girth measurement value - d2) 2

[0121] In the "girth measurement value" in the above girth score calculation formula, a predetermined reference set value is set according to the girth ratio or the arch circumference ratio. The "girth ratio" is the ratio of the girth to the foot length (girth ratio = girth / foot length). The "arch circumference ratio" is the ratio of the arch circumference to the foot length (arch circumference ratio = arch circumference / foot length). If the difference between the girth and the arch circumference is within a predetermined range, the girth score is calculated using the above calculation formula. In the case where the arch circumference exceeds the girth by more than the reference, the girth score is calculated using the arch circumference instead of the girth. In the case where the girth exceeds the arch circumference by more than the reference, the girth score is calculated using the average of the girth and the arch circumference. Hereinafter, a more specific calculation formula is described.

[0122] In the case where the girth is larger than the arch circumference and the difference between the girth ratio and the arch circumference ratio is within a predetermined reference range, for example, is below the predetermined reference value RD1 and is above the predetermined reference value RD2 (RD2 is a negative value), the following formula is used in the same manner as the above girth score calculation formula.

[0123] Girth score = (Last girth - Girth measurement - d2) 2

[0124] On the other hand, in the case where the arch circumference is larger than the girth and the girth ratio minus the arch circumference ratio is smaller than the predetermined reference range, that is, is smaller than the reference value RD2 (RD2 is a negative value), since the arch circumference exceeds the reference girth, the arch circumference measurement is used for the calculation of the girth score. The girth score calculation formula in this case is shown by the following formula.

[0125] Girth score = (Last arch circumference - Arch circumference measurement - d2) 2

[0126] Thus, with respect to a person whose arch circumference is larger than the girth, the girth score is evaluated based on the arch circumference, and the last fit rate can be more accurately calculated.

[0127] In the case where the girth is larger than the arch circumference and the difference between the girth ratio and the arch circumference ratio exceeds the predetermined reference range, that is, exceeds the reference value RD1, the average of the girth measurement and the arch circumference measurement is used for the calculation of the girth score. The girth score calculation formula in this case is shown by the following formula.

[0128] Girth score = ((Average of last girth and last arch circumference) - (Average of girth measurement and arch circumference measurement) - d2) 2

[0129] In the last, the girth and the arch circumference are approximately proportional, and there is little difference, and thus there is little difference in using either the girth or the arch circumference as the circumference. This is because the last is designed in a manner that the girth is proportional to the arch circumference. On the other hand, the relationship between the actual girth and the arch circumference obtained from a plurality of measurement subjects varies greatly depending on the measurement subject, and there are people whose girth is large and people whose arch circumference is large. The difference also varies from person to person. Depending on the difference between the girth and the arch circumference, the value used as the girth measurement is determined so that the girth score can be more appropriately calculated in accordance with such individual differences.

[0130] The above describes the present application based on the embodiment. The embodiment is merely an example, and those skilled in the art can understand that the above-described various constituent elements and the combination of the various processing procedures can have various modifications, and such modifications are also within the scope of the present application. Furthermore, if the above-described embodiment is generalized, the following scheme is obtained.

[0131] [Scheme 1]

[0132] A shoe fit evaluation device characterized by comprising:

[0133] a measurement value acquisition section that acquires measurement values of sizes of a plurality of foot portions including a foot length, i.e., a plurality of foot portion sizes, as foot shape size information of a foot shape of a prescribed measurement target person;

[0134] a last storage section that stores, for each of a plurality of lasts, sizes of last portions corresponding to the plurality of foot portions including the foot length, i.e., a plurality of last portion sizes, as last size information of a prescribed last;

[0135] a size difference calculation section that calculates, as a portion size difference, a difference between the measurement value of the foot portion size and the last portion size corresponding to the foot portion, in a form of performing a predetermined adjustment corresponding to the portion;

[0136] an evaluation processing section that calculates a last fit rate based on the portion size difference; and

[0137] an output section that outputs information related to the last fit rate.

[0138] [Scheme 2]

[0139] The shoe fit evaluation device according to Scheme 1, characterized in that, as the predetermined adjustment, the size difference calculation section calculates the portion size difference in a form of subtracting an allowance amount corresponding to an individual stretch characteristic of each portion of a shoe.

[0140] [Scheme 3]

[0141] The shoe fit evaluation device according to Scheme 1 or 2, characterized in that, as the predetermined adjustment, the size difference calculation section calculates a sum of squares of the portion size difference after applying an individual weight to each portion.

[0142] [Scheme 4]

[0143] The shoe fit evaluation device according to any one of Schemes 1 to 3, characterized in that, as the predetermined adjustment, the size difference calculation section applies a first weight to the portion size difference of the foot length and a second weight smaller than the first weight to the portion size difference other than the foot length, and calculates a sum of squares of the resulting portion size differences.

[0144] [Scheme 5]

[0145] The shoe fit evaluation device according to any one of Schemes 1 to 4, characterized in that, as the predetermined adjustment, the size difference calculation section uses a value corrected for an error in measurement of the measurement value of the foot portion size according to a measurement method, as the measurement value of the foot portion size.

[0146] [Scheme 6]

[0147] The shoe fit evaluation device according to any one of the schemes 1 to 5, wherein the plurality of foot parts is a combination of at least any one of a girth, a heel width, an arch circumference, a heel circumference, and a foot length.

[0148] [Scheme 7]

[0149] The shoe fit evaluation device according to any one of the schemes 1 to 6, wherein, as the predetermined adjustment, the size difference calculating section calculates the part size difference by adding a correction value corresponding to the heel width ratio with respect to the foot length.

[0150] [Scheme 8]

[0151] The shoe fit evaluation device according to any one of the schemes 1 to 6, wherein, as the predetermined adjustment, the size difference calculating section calculates the part size difference by adding a correction value corresponding to the heel circumference ratio with respect to the foot length, in a case where the girth is equal to or greater than a predetermined reference.

[0152] [Scheme 9]

[0153] The shoe fit evaluation device according to any one of the schemes 1 to 8, wherein, as the predetermined adjustment, the size difference calculating section calculates the part size difference by adding a correction value corresponding to any one of a heel width ratio with respect to the foot length and a heel circumference ratio with respect to the foot length, in a case where the girth is equal to or greater than a predetermined reference.

[0154] [Scheme 10]

[0155] The shoe fit evaluation device according to any one of the schemes 1 to 9, wherein, as the predetermined adjustment, with respect to the size of the foot length, the size difference calculating section calculates the part size difference by adding a correction value corresponding to a toe shape type in a foot shape of the measurement target person.

[0156] [Scheme 11]

[0157] The shoe fit evaluation device according to any one of the schemes 1 to 10, wherein, with respect to the size of the foot width, the size difference calculating section calculates a part size difference of the arch circumference in a case where a difference between a girth ratio with respect to the foot length and an arch circumference ratio with respect to the foot length is smaller than a predetermined reference range, calculates a part size difference of an average value of the girth and the arch circumference in a case where the difference between the girth ratio with respect to the foot length and the arch circumference ratio with respect to the foot length exceeds the predetermined reference range, and calculates a part size difference of the girth in a case where the difference between the girth ratio with respect to the foot length and the arch circumference ratio with respect to the foot length is within the predetermined reference range.

[0158] [Scheme 12]

[0159] The shoe fit evaluation device according to any one of the schemes 1 to 11, wherein the evaluation processing section calculates the shoe last fitness rate for each of a plurality of shoe lasts, and selects at least one shoe corresponding to a shoe last with a relatively large shoe last fitness rate from among a plurality of shoes,

[0160] The output section outputs information showing the selected shoe and the shoe last fitness rate for the shoe last thereof.

[0161] [Scheme 13]

[0162] The shoe fit evaluation device according to any one of the schemes 1 to 12, wherein the evaluation processing section calculates the shoe last fitness rate for each of a plurality of shoe lasts, and selects at least one shoe corresponding to a shoe last with a relatively large shoe last fitness rate from among a plurality of shoes,

[0163] The output section outputs information visually showing a comparison result of the shoe last part dimensions of the selected shoe and the foot part dimensions.

[0164] [Scheme 14]

[0165] The shoe fit evaluation device according to any one of the schemes 1 to 13, further comprising a measurement value storage section that stores the measurement values of the plurality of foot part dimensions in association with identification information of the measurement subject,

[0166] The dimension difference calculation section calculates the part dimension difference between shoe lasts of a shoe type selected by the measurement subject,

[0167] The evaluation processing section calculates the shoe last fitness rate between shoe lasts of a shoe type selected by the measurement subject,

[0168] The output section outputs information showing the shoe type selected by the measurement subject, information showing at least either one of a dimension in a foot length direction and a dimension in a foot width direction of a shoe with a relatively high shoe last fitness rate in the shoe type based on the measurement values of the measurement subject, and information showing the shoe last fitness rate.

[0169] [Scheme 15]

[0170] A shoe fit evaluation method, characterized by comprising the following processes:

[0171] A process of acquiring measurement values of a plurality of foot part dimensions including at least a foot length as foot shape dimension information of a foot shape of a prescribed measurement subject;

[0172] a process of reading out, from a predetermined storage unit, sizes of last parts corresponding to a plurality of foot parts including at least a foot length, that is, a plurality of last part sizes as last size information of a prescribed last;

[0173] a process of calculating a difference between a measured value of a foot part size and a last part size corresponding to the foot part, that is, a part size difference, in a form of performing a predetermined adjustment corresponding to the part;

[0174] a process of calculating a last fit rate based on the above part size difference; and

[0175] a process of outputting information related to the above last fit rate.

Claims

1. A shoe fit evaluation device, characterized in that, have: The measurement value acquisition unit acquires measurement values ​​of at least multiple foot parts including the length of the foot, i.e., multiple foot part dimensions, as foot shape size information of the specified measurement object's foot shape. The shoe last storage unit stores multiple shoe last part dimensions as shoe last size information for each type of shoe last, and the multiple shoe last part dimensions are the sizes of shoe last parts corresponding to multiple foot parts that include at least the foot length. The size difference calculation unit calculates the difference between the measured value of the foot part size and the size of the shoe last part corresponding to the foot part, i.e., the part size difference, in the form of making a predetermined adjustment corresponding to the part. The evaluation and processing department calculates the shoe last fit rate based on the size differences of the aforementioned parts; and The output section outputs information related to the fit rate of the aforementioned shoe lasts. Regarding foot width, the aforementioned size difference calculation unit calculates the portion size difference of the arch circumference when the difference between the foot circumference ratio and the arch circumference ratio for the foot length is less than a predetermined reference range; calculates the portion size difference of the average of the foot circumference and arch circumference when the difference exceeds a predetermined reference range; and calculates the portion size difference of the foot circumference when the difference is within a predetermined reference range.

2. The shoe fit evaluation device according to claim 1, characterized in that, As a predetermined adjustment, the aforementioned size difference calculation unit calculates the size difference of the aforementioned parts by subtracting the allowable amount corresponding to the individual stretch characteristics of each part of the shoe.

3. The shoe fit evaluation device according to claim 1 or 2, characterized in that, As a predetermined adjustment, the aforementioned size difference calculation unit calculates the sum of squares of the size differences of each part after applying individual weights to each part.

4. The shoe fit evaluation device according to claim 1 or 2, characterized in that, As a predetermined adjustment, the size difference calculation unit applies a first weight to the size difference of the leg length and a second weight smaller than the first weight to the size difference of parts other than the leg length, and calculates the sum of squares of the obtained size differences of the parts.

5. The shoe fit evaluation device according to claim 1 or 2, characterized in that, As a predetermined adjustment, the size difference calculation unit uses the measured value of the foot part size after applying error correction according to the measurement method as the measured value of the foot part size.

6. The shoe fit evaluation device according to claim 1 or 2, characterized in that, As a predetermined adjustment, the aforementioned size difference calculation unit calculates the size difference of the aforementioned part by adding a correction value corresponding to the ratio of heel width to foot length.

7. The shoe fit evaluation device according to claim 1 or 2, characterized in that, As a predetermined adjustment, regarding the foot length, the aforementioned size difference calculation unit calculates the size difference of the aforementioned part by adding a correction value corresponding to the toe shape type in the foot shape of the aforementioned measured person.

8. The shoe fit evaluation device according to claim 1 or 2, characterized in that, The evaluation and processing unit calculates the fit rate of each of the various shoe lasts, and selects at least one shoe from the multiple shoe options that corresponds to the shoe last with the relatively high fit rate. The output unit displays information about the selected shoes and the fit rate of the shoe last for them.

9. The shoe fit evaluation device according to claim 1 or 2, characterized in that, The evaluation and processing unit calculates the fit rate of each of the various shoe lasts, and selects at least one shoe from the multiple shoe options that corresponds to the shoe last with the relatively high fit rate. The output unit outputs information that visually shows the comparison results between the last size and the foot size of the selected shoe.

10. The shoe fit evaluation device according to claim 1 or 2, characterized in that, It also has a measurement value storage unit that stores the measurement values ​​of the multiple foot parts corresponding to the identification information of the person being measured. The aforementioned size difference calculation unit calculates the size difference of the aforementioned parts between the shoe last and the shoe type selected by the aforementioned measurement subject. The aforementioned evaluation and processing department calculates the fit rate of the shoe last between the last and the shoe type selected by the aforementioned test subjects. The output unit outputs information on the type of shoe selected by the test subject, information on at least one of the dimensions in the foot length direction and the foot width direction of the shoe with a relatively high last fit rate based on the test subject's measurements for that type of shoe, and information on the last fit rate.

11. A shoe fit evaluation device, characterized in that, have: The measurement value acquisition unit acquires measurement values ​​of at least multiple foot parts including the length of the foot, i.e., multiple foot part dimensions, as foot shape size information of the specified measurement object's foot shape. The shoe last storage unit stores multiple shoe last part dimensions as shoe last size information for each type of shoe last, and the multiple shoe last part dimensions are the sizes of shoe last parts corresponding to multiple foot parts that include at least the foot length. The size difference calculation unit calculates the difference between the measured value of the foot part size and the size of the shoe last part corresponding to the foot part, i.e., the part size difference, in the form of making a predetermined adjustment corresponding to the part. The evaluation and processing department calculates the shoe last fit rate based on the size differences of the aforementioned parts; and The output section outputs information related to the fit rate of the aforementioned shoe lasts. As a predetermined adjustment, the size difference calculation unit calculates the size difference of the above-mentioned part by adding a correction value corresponding to the ratio of the heel circumference to the foot length when the foot circumference is above a predetermined reference.

12. A shoe fit evaluation device, characterized in that, have: The measurement value acquisition unit acquires measurement values ​​of at least multiple foot parts including the length of the foot, i.e., multiple foot part dimensions, as foot shape size information of the specified measurement object's foot shape. The shoe last storage unit stores multiple shoe last part dimensions as shoe last size information for each type of shoe last, and the multiple shoe last part dimensions are the sizes of shoe last parts corresponding to multiple foot parts that include at least the foot length. The size difference calculation unit calculates the difference between the measured value of the foot part size and the size of the shoe last part corresponding to the foot part, i.e., the part size difference, in the form of making a predetermined adjustment corresponding to the part. The evaluation and processing department calculates the shoe last fit rate based on the size differences of the aforementioned parts; and The output section outputs information related to the fit rate of the aforementioned shoe lasts. As a predetermined adjustment, when the foot circumference is above a predetermined reference, the aforementioned size difference calculation unit calculates the size difference of the aforementioned part by adding either a correction value corresponding to the ratio of heel width to foot length and a correction value corresponding to the ratio of heel circumference to foot length, whichever is larger.

13. A method for evaluating shoe fit, characterized in that, It includes the following processes: The process of obtaining the dimensions of multiple foot parts, including at least the length of the foot, as foot shape size information for a person whose foot shape is specified for measurement. The process of reading the dimensions of the shoe last parts corresponding to multiple foot parts that include at least the foot length from a predetermined storage unit, i.e., the dimensions of multiple shoe last parts, as the shoe last size information of the specified shoe last; The process of calculating the measured value of the foot part size and the difference between the size of the shoe last part corresponding to the foot part, i.e., the part size difference, in the form of making predetermined adjustments corresponding to the part; The process of calculating the fit rate of the shoe last based on the size differences of the above-mentioned parts; as well as The process of outputting information related to the fit rate of the aforementioned shoe lasts. Regarding foot width, the difference in arch circumference is calculated when the difference between the ratio of foot circumference to foot length and the ratio of arch circumference to foot length is less than a predetermined reference range; the difference in average foot circumference and arch circumference is calculated when the difference exceeds a predetermined reference range; and the difference in foot circumference is calculated when the difference is within a predetermined reference range.

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