Note on dynamics of human head motions and on predictive filtering of head-set orientations

Karel Zikan; W. Dan Curtis; Henry A. Sowizral; Adam L. Janin

doi:10.1117/12.197325

21 December 1995 Note on dynamics of human head motions and on predictive filtering of head-set orientations

Karel Zikan, W. Dan Curtis, Henry A. Sowizral, Adam L. Janin

Proceedings Volume 2351, Telemanipulator and Telepresence Technologies; (1995) https://doi.org/10.1117/12.197325
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

Abstract

We investigate the problem of predicting future head orientations from past and current data because the use of raw sensor data in a virtual environment creates visual misalignment due to system time-lag. We develop a form of a generalized calculus where we can investigate trajectories of orientations in their most natural setting. Using a generalization of the Taylor expansion, we derive first- and second-order dynamics, that we then test against real data. Empirically, we discovered that both kinds of dynamics give fairly accurate predictions and that the first-order dynamic gives consistently better predictions than the second-order dynamic. We explain this result by forming a hypothesis: that changes in the orientation of a human head tend to be very simple. Expect for very brief surges of muscle energy when acceleration or deceleration occurs, the orientation of a human head is either fixed, or it changes in a linear, constant-angle motion about a fixed axis. We also test our first-order predictor against a published extended Kalman filter and we find that the first-order dynamic predictions are approximately 20% more accurate and have smaller variance.

Citation Download Citation

Karel Zikan, W. Dan Curtis, Henry A. Sowizral, and Adam L. Janin "Note on dynamics of human head motions and on predictive filtering of head-set orientations", Proc. SPIE 2351, Telemanipulator and Telepresence Technologies, (21 December 1995); https://doi.org/10.1117/12.197325

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