Publication: ExpertEyes: Open-source, high-definition eyetracking
Issued Date
2015-01-01
Resource Type
ISSN
15543528
1554351X
1554351X
Other identifier(s)
2-s2.0-84938061973
Rights
Mahidol University
Rights Holder(s)
SCOPUS
Bibliographic Citation
Behavior Research Methods. Vol.47, No.1 (2015), 73-84
Suggested Citation
Francisco J. Parada, Dean Wyatte, Chen Yu, Ruj Akavipat, Brandi Emerick, Thomas Busey ExpertEyes: Open-source, high-definition eyetracking. Behavior Research Methods. Vol.47, No.1 (2015), 73-84. doi:10.3758/s13428-014-0465-z Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/35315
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Title
ExpertEyes: Open-source, high-definition eyetracking
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Abstract
© 2014, Psychonomic Society, Inc. ExpertEyes is a low-cost, open-source package of hardware and software that is designed to provide portable high-definition eyetracking. The project involves several technological innovations, including portability, high-definition video recording, and multiplatform software support. It was designed for challenging recording environments, and all processing is done offline to allow for optimization of parameter estimation. The pupil and corneal reflection are estimated using a novel forward eye model that simultaneously fits both the pupil and the corneal reflection with full ellipses, addressing a common situation in which the corneal reflection sits at the edge of the pupil and therefore breaks the contour of the ellipse. The accuracy and precision of the system are comparable to or better than what is available in commercial eyetracking systems, with a typical accuracy of less than 0.4° and best accuracy below 0.3°, and with a typical precision (SD method) around 0.3° and best precision below 0.2°. Part of the success of the system comes from a high-resolution eye image. The high image quality results from uncasing common digital camcorders and recording directly to SD cards, which avoids the limitations of the analog NTSC format. The software is freely downloadable, and complete hardware plans are available, along with sources for custom parts.