Paper 11.270

Y. Yoshida et al., "Shape Completion and Modeling of 3D Foot Shape While Walking Using Homologous Model Fitting", in Proc. of 2nd Int. Conf. on 3D Body Scanning Technologies, Lugano, Switzerland, 2011, pp. 270-276, http://dx.doi.org/10.15221/11.270.

Title:

Shape Completion and Modeling of 3D Foot Shape While Walking Using Homologous Model Fitting

Authors:

Yuji YOSHIDA 1, Shunta SAITO 1, Yoshimitsu AOKI 1, Makiko KOUCHI 2, Masaaki MOCHIMARU 2

1 Faculty of Science and Technology, Keio University, Yokohama Kanagawa, Japan;
2 Digital Human Research Center, National Institute of Advanced Industrial Science and Technology, Odaiba, Tokyo, Japan

Abstract:

Technologies for measuring the human body shape have been developed to aid in the design of products. Recently, several 4D measurement systems have been developed. These systems can measure the shape of a foot during motion based on computer vision technology. We have developed a 4D measurement system (consisting of 4 camera-projector units) that can measure the shape of the foot at 200Hz. Using this system, about 50 frames of shape data for one step of walking, and about 100 frames for one step of running, were captured. However, the measured data have the following problems: [1] some parts cannot be measured due to occlusion; [2] measured data do not have anatomical information; [3] there is no widely accepted methodology for analyzing a time-series of body shape data.
To solve these problems, we developed a technology for creating homologous models of foot shape data obtained by a 4D measurement system. Homologous models consist of the same number of the same topology, and each data point is defined based on the anatomical homology. In the present modeling technology, we use a homologous model using a polyhedral template. The template model consists of data points for describing the surface shape, landmarks for defining the anatomical correspondence between shapes, and internal skeletons for describing joint angles. By fitting the template model to each frame we can accomplish homologous modeling for 4D-measured data.
We show how the model can be used for shape completion and modeling ----generating a complete surface mesh and granting anatomical feature points given a limited set of captured points specifying the target shape. Using principal component analysis (PCA) and joint rotation, we can accomplish homologous modeling for 4D-measured data.

Keywords:

anthropometry, homologous model, deformable model, principal component analysis, skeleton model, 3D model fitting

Details:

Full paper: 11.270.pdf
Proceedings: 3DBST 2011, 25-26 Oct. 2011, Lugano, Switzerland
Pages: 270-276
DOI: http://dx.doi.org/10.15221/11.270

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