| 摘要 |
A method and apparatus for determining ocular gaze point of regard and fixation duration utilizing Electrooculographic measurements and head position and orientation data. The Electrooculographic (EOG) potentials from an unipolar measuring configuration, are first amplified, filtered and digitized. A computation scheme based on the mathematical relation for the sum and difference potentials between opposing electrodes placed about the eye is then used to compute ocular orientation and amplifier gains and DC bias offset voltages. The sensor system of the invention may be embedded in a neoprene holder for a helmet mounted display; the holder fitting around the eyes like a set of goggles, is against the face well out of the way of the natural field of view. The invention is easily extended to the simultaneous tracking of both eyes thereby allowing the measurement of the optical convergence point in the user's three dimensional workspace either real or virtual. The invention can be used as an eyetracker to control computerized machinery by ocular gaze point of regard and fixation duration. For this reason, the invention has potential applications to the aviation cockpit during tasks demanding high visual and motor loading such as occur in low level helicopter flight.
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