1. Introduction
Real-time capture of human motion is of considerable interest in various domains including entertainment and the life sciences. Recent advances in computer vision and the availability of commodity wireless inertial sensors [13], [3] are beginning to take motion capture from constrained studio settings to more natural, outdoor environments, and with less encumbrance of the performer from specialized costumes and optical marker setups traditionally required (e.g. [4], [2]), while still retaining a high level of capture fidelity.