2 March 2018 Robust eye tracking based on multiple corneal reflections for clinical applications
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A set of methods in terms of both image processing and gaze estimation for accurate eye tracking is proposed. The eye-tracker used in this study relies on the dark-pupil method with up to 12 corneal reflections and offers an unprecedented high resolution imaging of the pupil and the cornea. The potential benefits of a higher number of glints and their optimum arrangement are analyzed considering distinct light sources configurations with 12, 8, 6, 4, and 2 corneal reflections. Moreover, a normalization factor of the pupil-glint vector is proposed for each configuration. There is a tendency for increasing accuracy with the number of glints, especially vertically (0.47 deg for 12 glints configuration versus 0.65 deg for 2 glints configuration). Besides the number of corneal reflections, their arrangement seems to have a stronger effect. A configuration that minimizes the interference of the eyelids with the corneal reflections is desired. Finally, the normalization of the pupil-glint vectors improves the vertical eye tracking accuracy up to 43.2%. In addition, the normalization also limits the need for a higher number of light sources to achieve better spatial accuracy.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Clara Mestre, Josselin Gautier, Jaume Pujol, "Robust eye tracking based on multiple corneal reflections for clinical applications," Journal of Biomedical Optics 23(3), 035001 (2 March 2018). https://doi.org/10.1117/1.JBO.23.3.035001 . Submission: Received: 10 October 2017; Accepted: 1 February 2018
Received: 10 October 2017; Accepted: 1 February 2018; Published: 2 March 2018

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