Journal: Behavior Research Methods

Article Title: Blink parameters are confounded by vertical eye orientation in video-based eye tracking: Comparing pupil- and eyelid-based methods

doi: 10.3758/s13428-026-02984-4

Figure Lengend Snippet: Experimental setup and eye openness estimation approach. ( A ) Recording setup: Synchronized data collection using the EyeLink 1000 Plus eye tracker for pupil-based measurements and a Basler high-speed camera (mounted on a mini tripod) for eyelid tracking. Both systems recorded simultaneously to enable comparison of blink detection methods. ( B ) Landmark detection: Example eye frame with 12 eyelid landmarks – five per eyelid and one at each canthus (inner and outer eye corners). Eye openness is the Euclidean distance between the central upper and lower eyelid landmarks (points 3 and 8; connected by the blue line), converted to millimeters via offline calibration

Article Snippet: Recordings were obtained with a Basler monochrome high-speed camera (daA1920-160um; 16-mm lens; IR pass filter) at 500 Hz with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1088\times 320$$\end{document} 1088 × 320 px resolution.

Techniques: Comparison