3D Foot Digitization Using Photogrammetric Marks
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Solution Overview
Problem
Current methods for nondestructive 3D digitization of the internal shape of footwear are complex, time-consuming, and costly, making it difficult to adapt 3D foot models to shoe lasts for mass customization, and existing photogrammetric systems require calibration and are not suitable for use in shoe stores.
Innovation Solution
A sensing device with a camera rigidly connected to a sensing end, using photogrammetrically marked surfaces for automatic evaluation, allowing for self-calibration and non-contact scanning of internal shoe shapes without the need for extensive calibration, using a combination of photogrammetric and opto-electronic or acoustic distance measuring devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional photogrammetric systems are used for 3D digitization, then measurement precision is improved, but device complexity and calibration requirements increase
Solution Approach 1:
The patent extracts the essential photogrammetric marking system from complex traditional photogrammetric equipment. By using simple marks on the shoe interior surface that can be captured by a standard camera, the system eliminates the need for complex photogrammetric cameras, calibration procedures, and specialized equipment while maintaining 3D digitization precision.
Solution Approach 2:
The patent employs inexpensive, easily applied marks (such as adhesive labels or temporary markings) on the shoe interior surface instead of expensive, complex photogrammetric equipment. These simple marks serve the essential function of providing reference points for 3D reconstruction without requiring costly infrastructure.
2Object-affected harmful factors
If endoscopic camera systems are used for shoe interior digitization, then nondestructive measurement is achieved, but device complexity and time consumption increase
Solution Approach 1:
The patent divides the shoe interior digitization process into simple, discrete steps: applying marks to the interior surface, positioning the camera, and capturing images. This segmentation of the measurement process eliminates the need for complex endoscopic systems and lengthy calibration procedures, achieving nondestructive measurement quickly and efficiently.
Solution Approach 2:
The marked surfaces on the shoe interior serve as their own calibration reference, eliminating the need for separate calibration procedures. The marks themselves provide the geometric information needed for 3D reconstruction, making the system self-calibrating and significantly reducing measurement time while maintaining nondestructive operation.
3Measurement precision
If photogrammetric cameras are used for 3D measurement, then measurement precision is improved, but calibration requirements and cost increase
Solution Approach 1:
The patent extracts the calibration function from complex photogrammetric cameras and implements it through simple, manually applied marks on the shoe interior. These marks serve as the calibration reference, eliminating the need for expensive calibrated equipment and complex calibration procedures while maintaining 3D coordinate accuracy.
Solution Approach 2:
The patent replaces expensive, calibrated photogrammetric cameras with a simple camera system and inexpensive marks. These marks can be easily applied and removed, providing the necessary calibration information without requiring costly infrastructure or complex setup procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, low-cost, and space-saving 3D digitization of shoe interiors, allowing for the determination of the best fitting shoe by comparing foot models with internal shoe models, reducing the complexity and cost associated with existing methods.
Implementation Method 1
the camera (30) is arranged such that it can detect a surface (12) which is provided with marks (22) suitable to be automatically photogrammetrically evaluated
Implementation Method 2
using a combination of photogrammetric and opto-electronic or acoustic distance measuring devices
Implementation Method 3
using a combination of photogrammetric and opto-electronic or acoustic distance measuring devices
Data Source
AI summary
A sensing device having a sensing arrangement with a sensing end (32) for coming into contact with a surface to be scanned of a body (26), a camera (30), and a connecting device (34) for rigidly connecting the camera with the sensing end, the camera being arranged such that it can detect a surface (12) which is provided with marks suitable to be automatically photogrammetrically evaluated and on which the body to be scanned has been placed, when the sensing end comes into contact with different points of the surface to be scanned of the body. The sensing device further has a photogrammetric evaluation program for a computing unit (18), the computing unit being configured such that image signals generated by the camera can be routed to the computing unit and the evaluation program can calculate the 3D coordinates of the surface to be scanned from the sequence of recorded and transmitted image sections using the marks (22) suitable to be automatically photogrammetrically evaluated. A method of detecting a three-dimensional spatial shape of a body, in particular the spatial shape of an interior of a hollow body, the method including the following steps: fastening the body to be digitized on a surface (12) which, at known positions, is provided with marks (22) suitable to be automatically photogrammetrically evaluated, and providing the sensing device. Further steps are the scanning of a point on the spatial shape to be detected by means of the sensing end (32) of the sensing arrangement (28), recording at least one section of the photogrammetrically marked surface by the camera (30) while the sensing end scans the point, a plurality of marks suitable to be photogrammetrically evaluated being detected, and repeating the steps of scanning and recording for a multitude of different points of the spatial shape to be detected. The recorded images are evaluated by an evaluation program.