Pupil tracking under direct sunlight

Conference Paper


Pupil tracking in a bright outdoor environment is challenging due to low eye image quality and reduced pupil size in response to bright light. In this study we present research to develop robust outdoor pupil tracking without the need for shading the eyes. We first investigate the effect of camera post-processing settings in order to find values that enhance image quality for the purpose of pupil tracking under direct, oblique and overcast sunlight illuminations. We then tested the performance of the state-of-the-art pupil tracking techniques under these extreme real-world outdoor lighting conditions. Our results suggest that a key goal should be maintaining the contrast between iris and pupil to support accurate estimation of pupil position regardless of the overall eye image quality.

Conference Name

2021 ACM Syposium on Eye Tracking Research and Applications ActivEye Workshop

Year of Publication


Date Published



Association for Computing Machinery

Conference Location