Visible-light wearable eye gaze tracking by gradients-based eye center location and head movement compensation with IMU

In this paper, a visible-light based wearable eye gaze tracking technique is developed for outdoor and indoor applications. By using the gradients based iris center location and head movement compensation with the inertial measurement unit (IMU), the proposed eye tracker works effectively. In our tests, the average estimated errors of iris centers are smaller than 6 pixels. For the indoor case at testing mode, the average horizontal and vertical tracking errors of gaze tracking are 2.4 and 2.53 degrees, respectively. For the outdoor case at testing mode, the average gaze tracking errors are less than 2.2 degrees. The proposed core function executes up to 234 frames/sec by a PC at 3.4GHz working frequency.