Development of a low cost pupillometer-eyetracker and applications

Arturo Bianchetti; Liliana I. Perez; Silvia A. Comastri

doi:10.1117/12.2021054

18 November 2013 Development of a low cost pupillometer-eyetracker and applications

Arturo Bianchetti, Liliana I. Perez, Silvia A. Comastri

Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785DA (2013) https://doi.org/10.1117/12.2021054
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal

Abstract

The determination of ocular pupil diameter and gaze direction is important in various psychophysical and cognitive tests and can be accomplished using commercial, academic or open-source devices. In this work we develop a table-top pupillometer eyetracker termed Blick, the hardware costs 50 dollars and the software is open source (https://github.com/abianchetti/blick). The hardware is mounted in a portable holder and comprises an illumination system (two infrared LEDs generating 0.13 W/m² at 22 cm) and a detection system (containing an USB camera, an infrared filter and a 16mm lens system) The software, programmed in C++ using OpenCV and cvblob libraries, processes eye images in real time and supplies plots and tables of pupil diameter and gaze direction and a video of the eye. As applications, capturing the right eye of six young emmetropes and after performing the pixel-mm and homographic calibrations (required to determine diameter in mm and gaze direction), we conduct three tests. The corresponding tasks are to detect mistakes in three series of four poker cards, to recognize letters F between distractors and to write a sentence via eye movements using Blick as eye tracker and the tool Dasher (MacKays´s Cambridge Group). We obtain that Blick´s performance is satisfactory (errors being 0.05 mm in pupil diameter and 1 degree in gaze direction); that there are slight pupil dilations when subjects used to playing cards find mistakes and when some subjects find targets and, finally, that Blick can be employed as eyetracker to allow communication of disabled persons.

Citation Download Citation

Arturo Bianchetti, Liliana I. Perez, and Silvia A. Comastri "Development of a low cost pupillometer-eyetracker and applications", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785DA (18 November 2013); https://doi.org/10.1117/12.2021054

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KEYWORDS

Calibration

Eye

Light emitting diodes

Imaging systems

Image segmentation

Cameras

Image processing

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