Abstract
Three-dimensional (3D) measurements of the feet is crucial for the correct design and selection of shoes. Badly-fitting shoes are one of the major causes of pain, foot related diseases and injuries of the feet. This article presents a new system for 3D foot-shape measurements which is based on the laser-multiple-line-triangulation principle. The main part of a system is the measuring head comprising a three laser lines projection unit and two cameras, which rotate around the centre of the platform that the customer stands on, and measures both feet simultaneously. The developed software analyzes the different foot dimensions and suggests the most suitable model and size of a shoe from a database to the customer. Three experiments have been presented to demonstrate the measuring precision of the system: the in-vitro measurement of plastic feet, in-vivo within an hour and in-vivo within one week. The results show that the standard deviation for all feet dimensions is better than 0.6mm in in-vitro case.
Highlights
Knowledge of the exact three-dimensional (3D) shape of the feet is extremely important for the footwear industry, since the correct fit between the shoe and the foot is an important comfort factor
If the customer or operator is satisfied with the results, the complete 3D measurement is saved to the personal computer (PC), otherwise the measurement is repeated
The main part of the system is the measuring head which rotates around the centre of the standing platform where the treated person stands and measures both feet simultaneously in 10 seconds
Summary
Knowledge of the exact three-dimensional (3D) shape of the feet is extremely important for the footwear industry, since the correct fit between the shoe and the foot is an important comfort factor. Fitting shoes are the major cause of pain, foot related diseases and injuries [1] to [4]. The step in the foot measurement evolution are two-dimensional foot scanners, which measure the shape and dimensions of the footwear using a photo capturing in a flat plane [8]. The major drawback of these systems is the lack of foot height measurement. -called two-and-half-dimension scanners, which measure foot contours from the top and side view [9] to [11] enable extraction of foot’s length, width and height in any cross-section. The girths of the crosssections, their curvature and local foot deformation are still not known
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