Abstract
Human motions are often measured by a motin capture system and approximated as motions of a rigid-link model for performing motion analysis. However, the relation between the motions of reflective markers on the body surface and the motions of the rigid link model is difficult to define, because of noise and modeling errors. We propose a simple and analytical method to estimate the parameters and motion of a two-dimensional closed-link model that approximates motion capture data obtained from bicycle pedaling. It was shown that the method can estimate the motions of the closed-link model whose joint positions were close to the motion capture data.
