The effect of mapping function on the accuracy of a video-based eye tracker

Authors:
Pieter Blignaut;Daniël Wium
Affiliations:
University of the Free State, South Africa;University of the Free State, South Africa
Venue:
Proceedings of the 2013 Conference on Eye Tracking South Africa
Year:
2013

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Abstract

In a video-based eye tracker the pupil-glint vector changes as the eyes move. Using an appropriate model, the pupil-glint vector can be mapped to coordinates of the point of regard (PoR). Using a simple hardware configuration with one camera and one infrared source, the accuracy that can be achieved with various mapping models is compared with one another. No single model proved to be the best for all participants. It was also found that the arrangement and number of calibration targets has a significant effect on the accuracy that can be achieved with the said hardware configuration. A mapping model is proposed that provides reasonably good results for all participants provided that a calibration set with at least 8 targets is used. It was shown that although a large number of calibration targets (18) provide slightly better accuracy than a smaller number of targets (8), the improvement might not be worth the extra effort during a calibration session.