Power management in an eye-tracking system

Abstract

An imaging device adapted to provide eye-tracking data by imaging at least one eye of a viewer, wherein: the imaging device is switchable between at least an active mode and a ready mode; the imaging device is configured, in the active mode, to use active eye illumination, which enables tracking of a corneal reflection, and to provide eye tracking data which include eye position and eye orientation; and the imaging device is configured, in the ready mode, to reduce an illumination intensity from a value the illumination intensity has in the active mode.

1 . An imaging device adapted to provide data measurements by imaging at least one eye of a viewer, wherein:
 the data measurements describe one or more of eye position or eye orientation;   the imaging device is switchable between at least an active mode and a ready mode;   the imaging device is configured, in the active mode, to maintain a first result history of the data measurements based on data gathered based on first criteria, the first criteria including a first frame rate;   the imaging device is configured, in the ready mode, to maintain a second result history of the data measurements based on data gathered based on second criteria, the second criteria including a second frame rate that is lower than the first frame rate; and   upon switching to the active mode from the ready mode, the imaging device provides additional data based on a combination of the data measurements from the first result history and the data measurements from the second result history.