Title: 3D measurement of human plantar foot by projection moiré technique

Authors: Sara Del Vecchio; Priscila Albuquerque De Araújo; Juan Carlos Campos Rubio; Marcos Pinotti; Meinhard Sesselmann

Addresses: Mechanical Engineering Department, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha Belo Horizonte, MG, Cep.: 31270-901, Brazil. ' Mechanical Engineering Department, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha Belo Horizonte, MG, Cep.: 31270-901, Brazil. ' Mechanical Engineering Department, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha Belo Horizonte, MG, Cep.: 31270-901, Brazil. ' Mechanical Engineering Department, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha Belo Horizonte, MG, Cep.: 31270-901, Brazil. ' Mechanical Engineering Department, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Pampulha Belo Horizonte, MG, Cep.: 31270-901, Brazil

Abstract: An optical system composed of an LCD projector, a digital camera and a microcomputer aims to measure three-dimensionally human foot model and is based on projection moiré technique. Four digital phase shifted parallel grating patterns are projected upon the specimen surface and observed by the camera. A phase map of moiré fringes is produce digitally combining the fringe maps distorted by the foot whit those, left undistorted, by a reference plane. The 3D profile was calculated using two-dimensional greyscale images by dedicated software. This profile was compared to the measurement data of the same foot obtained from a coordinate measuring machine (CMM). A brief metrological analysis estimated an uncertainty value of 6.3% for the foot. The main advantages of this system were its easy set-up, use of standard optical components, absence of moving parts and its possible applicability in bioengineering.

Keywords: projection moire; bioengineering; 3D measurement; phase shifting; foot geometry; optical measurement; metrology.

DOI: 10.1504/IJMMS.2012.046147

International Journal of Mechatronics and Manufacturing Systems, 2012 Vol.5 No.1, pp.3 - 16

Received: 01 Nov 2010
Accepted: 19 Jul 2011
Published online: 20 Aug 2014 *

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