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Tests of a New Drowsiness Characterization and Monitoring System Based on Ocular Parameters

Author

Listed:
  • Clémentine François

    (Laboratory for Signal and Image Exploitation, Department of Electrical Engineering and Computer Science, University of Liège, Liège 4000, Belgium)

  • Thomas Hoyoux

    (Laboratory for Signal and Image Exploitation, Department of Electrical Engineering and Computer Science, University of Liège, Liège 4000, Belgium)

  • Thomas Langohr

    (Laboratory for Signal and Image Exploitation, Department of Electrical Engineering and Computer Science, University of Liège, Liège 4000, Belgium)

  • Jérôme Wertz

    (Phasya s.a. Company, Angleur 4031, Belgium)

  • Jacques G. Verly

    (Laboratory for Signal and Image Exploitation, Department of Electrical Engineering and Computer Science, University of Liège, Liège 4000, Belgium)

Abstract

Drowsiness is the intermediate state between wakefulness and sleep. It is characterized by impairments of performance, which can be very dangerous in many activities and can lead to catastrophic accidents in transportation or in industry. There is thus an obvious need for systems that are able to continuously, objectively, and automatically estimate the level of drowsiness of a person busy at a task. We have developed such a system, which is based on the physiological state of a person, and, more specifically, on the values of ocular parameters extracted from images of the eye (photooculography), and which produces a numerical level of drowsiness. In order to test our system, we compared the level of drowsiness determined by our system to two references: (1) the level of drowsiness obtained by analyzing polysomnographic signals; and (2) the performance of individuals in the accomplishment of a task. We carried out an experiment in which 24 participants were asked to perform several Psychomotor Vigilance Tests in different sleep conditions. The results show that the output of our system is well correlated with both references. We determined also the best drowsiness level threshold in order to warn individuals before they reach dangerous situations. Our system thus has significant potential for reliably quantifying the level of drowsiness of individuals accomplishing a task and, ultimately, for preventing drowsiness-related accidents.

Suggested Citation

  • Clémentine François & Thomas Hoyoux & Thomas Langohr & Jérôme Wertz & Jacques G. Verly, 2016. "Tests of a New Drowsiness Characterization and Monitoring System Based on Ocular Parameters," IJERPH, MDPI, vol. 13(2), pages 1-10, January.
    • Handle: RePEc:gam:jijerp:v:13:y:2016:i:2:p:174-:d:63135
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    Cited by:

    1. Charli Sargent & Paul Roberts & Drew Dawson & Sally Ferguson & Lynn Meuleners & Libby Brook & Gregory D. Roach, 2016. "The Relationships between Human Fatigue and Public Health: A Brief Commentary on Selected Papers from the 9th International Conference on Managing Fatigue in Transportation, Resources and Health," IJERPH, MDPI, vol. 13(9), pages 1-3, August.

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