Shoe Fit Evaluation Using 3D Foot Shape and Last Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies lack an accurate method for evaluating shoe fit based on foot shape measurements, as they do not account for the design concepts and characteristics of shoes and lasts, leading to inefficiencies in selecting well-fitting shoes without expert knowledge.
Innovation Solution
A shoe fit evaluation system that uses a three-dimensional foot shape measuring device to capture foot shape data, which is then compared to pre-stored last data to calculate dimensional differences and evaluate fit based on last matching rates, thereby simulating the expertise of a shoe fitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If foot shape is compared to last using general dimensional comparison methods, then the comparison can be performed, but the design concepts and characteristics of shoes and lasts are not fully reflected, leading to inaccurate fit evaluation
Solution Approach 1:
The patent creates a three-dimensional digital copy of the foot shape and a three-dimensional digital model of the last, allowing for precise virtual comparison without requiring physical prototypes. This digital copying enables accurate fit evaluation while preserving all design characteristics of the last, including confidential manufacturer information.
Solution Approach 2:
The patent transforms the comparison from simple dimensional measurements to a comprehensive multi-parameter evaluation system that considers various foot shape parameters (length, width, girth) and compares them against corresponding last parameters, incorporating design concepts through weighted scoring and fit evaluation algorithms.
2Measurement precision
If professional shoe fitters are used to select shoes, then accurate fit selection can be achieved, but the process requires expert knowledge and skills that are not easily accessible
Solution Approach 1:
The system enables customers to perform their own foot shape measurement and shoe fit evaluation without requiring professional shoe fitters. The automated three-dimensional scanning and comparison system guides users through the process, making expert-level shoe selection accessible to anyone with basic operational skills.
Solution Approach 2:
The patent replaces the mechanical expertise of human shoe fitters with an automated computer-based system that uses three-dimensional scanning, digital modeling, and algorithmic comparison to objectively evaluate fit, eliminating the need for subjective human judgment while maintaining or improving accuracy.
3Measurement precision
If detailed last information is made available for comparison, then fit evaluation accuracy improves, but manufacturer confidential information is exposed
Solution Approach 1:
The system uses digital copies and models of the last rather than exposing actual physical lasts or proprietary design documents. The three-dimensional digital model captures all necessary geometric information for accurate comparison while maintaining the confidentiality of manufacturer trade secrets and intellectual property.
Solution Approach 2:
The patent introduces a digital intermediary layer (the three-dimensional digital model of the last) that mediates between the confidential manufacturer information and the customer's fit evaluation needs. This intermediary preserves all essential fit characteristics while protecting sensitive business information from direct exposure.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
In a shoe fit evaluation system (100), a dimensional difference calculator (72) calculates a part dimensional difference, which is a difference between a measurement value of a foot part dimension and a last part dimension corresponding to the foot part, by performing a certain adjustment for the part. An evaluation processor (74) calculates a last matching rate based on the part dimensional difference. An outputter (80) outputs information regarding the last matching rate. The dimensional difference calculator (72) calculates the part dimensional difference by performing, as the certain adjustment, subtraction of an allowance for specific stretch properties of each shoe part.