Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics

Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics

Camera-based eye trackers are the mainstay of eye movement research and countless practical applications of eye tracking. Recently, a significant impact of changes in pupil size on gaze position as measured by camera-based eye trackers has been reported. In an attempt to improve the understanding of...

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Main Authors: Drewes, Jan, Zhu, Weina, Hu, Yingzhou, Hu, Xintian
Format: Online
Language:English
Published: Public Library of Science 2014
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4206464/
id pubmed-4206464
recordtype oai_dc
spelling pubmed-42064642014-10-27 Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics Drewes, Jan Zhu, Weina Hu, Yingzhou Hu, Xintian Research Article Camera-based eye trackers are the mainstay of eye movement research and countless practical applications of eye tracking. Recently, a significant impact of changes in pupil size on gaze position as measured by camera-based eye trackers has been reported. In an attempt to improve the understanding of the magnitude and population-wise distribution of the pupil-size dependent shift in reported gaze position, we present the first collection of binocular pupil drift measurements recorded from 39 subjects. The pupil-size dependent shift varied greatly between subjects (from 0.3 to 5.2 deg of deviation, mean 2.6 deg), but also between the eyes of individual subjects (0.1 to 3.0 deg difference, mean difference 1.0 deg). We observed a wide range of drift direction, mostly downward and nasal. We demonstrate two methods to partially compensate the pupil-based shift using separate calibrations in pupil-constricted and pupil-dilated conditions, and evaluate an improved method of compensation based on individual look-up-tables, achieving up to 74% of compensation. Public Library of Science 2014-10-22 /pmc/articles/PMC4206464/ /pubmed/25338168 http://dx.doi.org/10.1371/journal.pone.0111197 Text en © 2014 Drewes et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Drewes, Jan
Zhu, Weina
Hu, Yingzhou
Hu, Xintian
spellingShingle Drewes, Jan
Zhu, Weina
Hu, Yingzhou
Hu, Xintian
Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
author_facet Drewes, Jan
Zhu, Weina
Hu, Yingzhou
Hu, Xintian
author_sort Drewes, Jan
title Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
title_short Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
title_full Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
title_fullStr Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
title_full_unstemmed Smaller Is Better: Drift in Gaze Measurements due to Pupil Dynamics
title_sort smaller is better: drift in gaze measurements due to pupil dynamics
description Camera-based eye trackers are the mainstay of eye movement research and countless practical applications of eye tracking. Recently, a significant impact of changes in pupil size on gaze position as measured by camera-based eye trackers has been reported. In an attempt to improve the understanding of the magnitude and population-wise distribution of the pupil-size dependent shift in reported gaze position, we present the first collection of binocular pupil drift measurements recorded from 39 subjects. The pupil-size dependent shift varied greatly between subjects (from 0.3 to 5.2 deg of deviation, mean 2.6 deg), but also between the eyes of individual subjects (0.1 to 3.0 deg difference, mean difference 1.0 deg). We observed a wide range of drift direction, mostly downward and nasal. We demonstrate two methods to partially compensate the pupil-based shift using separate calibrations in pupil-constricted and pupil-dilated conditions, and evaluate an improved method of compensation based on individual look-up-tables, achieving up to 74% of compensation.
publisher Public Library of Science
publishDate 2014
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4206464/
_version_ 1613147760995860480

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