Abstract
Tracking driver’s gaze is an integral part of driving monitoring systems, designed to assess the driver’s state. In this work, we report a novel method that creates a ‘vocabulary’ of driver’s gaze patterns during naturalistic driving, across a variety of driving environments. We use an information-theory based unsupervised clustering method to create a vocabulary that contains mutual information between properties of the driving scenarios (e.g., approaching and crossing junctions) and the gaze clusters. Our clustering begins with a dual-staged process of a change of representation. It transforms segments from raw gaze samples into a probabilistic Gaussian Mixture Model (GMM). By using GMM, we were able to represent a gaze sequence of several seconds as a stationary distribution. These GMMs were then grouped in the second stage using information-theory divergence into clusters of segments. The cluster IDs are our ‘vocabulary’. We evaluate our model on a dataset of 15 hr of naturalistic driving, comprising urban, suburban, and highways. The evaluation demonstrates that our clusters preserve relevant driving-related information, and the vocabulary contains meaningful states of driving behaviour.
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