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Inexpensive, unobtrusive 3D motion tracking of human gait is of increasing interest for the medical and entertainment industries. Of particular interest are rehabilitative applications. For instance, being able to measure foot travel, e.g. stride length or foot clearance, would be very useful. Approaches using low-cost MEMS inertial measurement units have often been limited by requiring expensive calibration procedures and by the sensor's inherent noise and bias drift. The authors apply twodoi:10.4172/2155-9538.s1-006 fatcat:7lh44xqozbe7voww4wltypdkha