title: A simple algorithm for the offline recalibration of eye-tracking data through best-fitting linear transformation.
abstract: Poor calibration and inaccurate drift correction can pose severe problems for eye-tracking experiments requiring high levels of accuracy and precision. We describe an algorithm for the offline correction of eye-tracking data. The algorithm conducts a linear transformation of the coordinates of fixations that minimizes the distance between each fixation and its closest stimulus. A simple implementation in MATLAB is also presented. We explore the performance of the correction algorithm under several conditions using simulated and real data, and show that it is particularly likely to improve data quality when many fixations are included in the fitting process.
authors.affiliation: University College London, London, UK. miguel.vadillo@kcl.ac.uk.|Primary Care and Public Health Sciences, King's College London, Capital House, 42 Weston St., London, SE1 3QD, UK. miguel.vadillo@kcl.ac.uk.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Vadillo
authors.affiliation: University of British Columbia, Vancouver, BC, Canada.
authors.forename: Chris N H
authors.initials: CNH
authors.lastname: Street
authors.affiliation: University of New South Wales, Sydney, NSW, Australia.
authors.forename: Tom
authors.initials: T
authors.lastname: Beesley
authors.affiliation: University College London, London, UK.
authors.forename: David R
authors.initials: DR
authors.lastname: Shanks
mesh_terms: D000465:Algorithms; D002138:Calibration; D005133:Eye Movements / Q000502:physiology*; D005403:Fixation, Ocular; D006801:Humans; D016014:Linear Models; D011597:Psychomotor Performance / Q000502:physiology*; D016896:Treatment Outcome
keywords: Drift correction; Eye-tracking; Recalibration