Inertial based motion capture systems are becoming increasingly prominent. They provide an attractive alternative to optical based systems, which are expensive, susceptible to marker occlusion, and have limited capture areas. However, current inertial based systems are often bulky and inaccurate. Accuracy issues arise when calculating displacement. Inertial measurement units output acceleration and rotational velocities, which are then integrated to give displacement. The integration of the accelerations and rotational velocities include errors that cause the predicted motion of the sensor to drift from its true value. This wireless motion capture system uses a dynamic model to constrain the drift due to integration. The use of a model with the sensor measurements will lead to a motion capture system whose accuracy is comparable to optical systems at a fraction of the cost.
Provisional Patent filed.
Proof of Concept - Early prototype built