Practical Motion Capture in Everyday Surroundings


Daniel Vlasic (MIT), Rolf Adelsberger (MERL & ETH Zurich), Giovanni Vannucci (MERL), John Barnwell (MERL), Markus Gross (ETH Zurich), Wojciech Matusik (MERL), and Jovan Popovic (MIT).



Traditional motion-capture systems excel at recording motions within lab-like environments but struggle with recording outdoor activities such as skiing, biking, and driving. This limitation led us to design a wearable motion-capture system that records human activity in both indoor and outdoor environments.




Commercial motion-capture systems produce excellent in-studio reconstructions, but offer no comparable solution for acquisition in everyday environments. We present a system for acquiring motions almost anywhere. This wearable system gathers ultrasonic time-of-flight and inertial measurements with a set of inexpensive miniature sensors worn on the garment. After recording, the information is combined using an Extended Kalman Filter to reconstruct joint configurations of a body. Experimental results show that even motions that are traditionally difficult to acquire are recorded with ease within their natural settings. Although our prototype does not reliably recover the global transformation, we show that the resulting motions are visually similar to the original ones, and that the combined acoustic and inertial system reduces the drift commonly observed in purely inertial systems. Our final results suggest that this system could become a versatile input device for a variety of augmented-reality applications.



Daniel Vlasic, Rolf Adelsberger, Giovanni Vannucci, John Barnwell, Markus Gross, Wojciech Matusik, and Jovan Popovic. Practical Motion Capture in Everyday Surroundings. ACM Transactions on Graphics. 26(3) August 2007.


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