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Objective evaluation of driving fatigue by using variability of pupil diameter under spontaneous pupillary fluctuation conditions / 生物医学工程学杂志
Journal of Biomedical Engineering ; (6): 239-244, 2013.
Artigo em Chinês | WPRIM | ID: wpr-234671
ABSTRACT
Objective evaluation of driver drowsiness is necessary toward suppression of fatigued driving and prevention of traffic accident. We have developed a new method in which we utilized pupillary diameter variability (PDV) under spontaneous pupillary fluctuation conditions. The method consists of three main steps. Firstly, we use a 90s long infrared video of pupillogram infrared-sensitive CCD camera. Secondly, we employed edge detection algorithm based on curvature characteristics of pupil boundary to extract a set of points of visible pupil boundary, and then we adopted these points to fit a circle to obtain the diameter of the pupil in current frame of video. Finally, the values of PDV in 90s long video is calculated. In an experimental pilot study, the values of PDV of two groups were measured. One group rated themselves as alert (12 men), the other group as sleepy (13 men). The results showed that significant differences could be found between the two groups, and the values were 0.06 +/- 0.005 and 0.141 +/- 0.042, respectively. Taking into account of the knowledge that spontaneous pupillary fluctuation is innervated by autonomic nervous system which activity is known to change in parallel with drowsiness and cannot be influenced by subjective motive of people. From the results of the experiments, we concluded that PDV could be used to evaluate driver fatigue objectively.
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Fisiologia / Condução de Veículo / Algoritmos / Pupila / Iris / Diagnóstico / Fadiga / Métodos / Monitorização Fisiológica Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Chinês Revista: Journal of Biomedical Engineering Ano de publicação: 2013 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Fisiologia / Condução de Veículo / Algoritmos / Pupila / Iris / Diagnóstico / Fadiga / Métodos / Monitorização Fisiológica Tipo de estudo: Estudo diagnóstico Limite: Humanos Idioma: Chinês Revista: Journal of Biomedical Engineering Ano de publicação: 2013 Tipo de documento: Artigo