NDLI: Shifts in reported gaze position due to changes in pupil size: ground truth and compensation

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Shifts in reported gaze position due to changes in pupil size: ground truth and compensation

Content Provider	ACM Digital Library
Author	Drewes, Jan Masson, Guillaume S. Montagnini, Anna
Abstract	Camera-based eye trackers are the mainstay of today's eye movement research and countless practical applications of eye tracking. Recently, a significant impact of changes in pupil size on the accuracy of camera-based eye trackers during fixation has been reported [Wyatt 2010]. We compared the pupil-size effect between a scleral search coil based eye tracker (DNI) and an up-to-date infrared camera-based eye tracker (SR Research Eyelink 1000) by simultaneously recording human eye movements with both techniques. Between pupil-constricted and pupil-relaxed conditions we find a subject-specific shift in reported gaze position exceeding 2 degrees only with the camera based eye tracker, while the scleral search coil system simultaneously reported steady fixation. This confirms that the actual point of fixation did not change during pupil constriction/relaxation, and the resulting shift in measured gaze position is solely an artifact of the camera-based eye tracking system. We demonstrate a method to partially compensate the pupil-based shift using separate calibrations in pupil-constricted and pupil-dilated conditions, with pupil size as an index to dynamically weight the two calibrations.
Starting Page	209
Ending Page	212
Page Count	4
File Format	PDF
ISBN	9781450312219
DOI	10.1145/2168556.2168596
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-03-28
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Pupil Search coil Calibration Eye tracking
Content Type	Text
Resource Type	Article

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