The Analysis On Driver's Visual Search Process In Real Environment Of Mountain And Urban Road

The driver factor plays the primary role in the traffic transport system. The visual system as the input channel for sensory information is necessary when drivers are on their driving. In order to reduce the occurrence of traffic accidents, it is necessary to analyze drivers'visual search characters, so as to carry out further study on drivers'visual search process and characteristic parameter.Based on the review and analysis of drivers'dynamic visual characters and related theories, this article focuses on analyzing the driver's visual search process and its characterization parameters. The visual search process is consisted of a series of fixations and saccades, mainly characterization parameters is: fixation duration, pupil size, fix_X_angle, fix_Y_angle, distance between fixations, number of fixations, saccade duration, saccade amplitude, saccade average velocity, saccade peak velocity, saccade angle.The method of the cluster analysis and principal components analysis is used to classify and filter the parameters, in order to describe the parameters of the visual search process with the least parameters. Finally the parameters of description the visual search process is: fixation duration, pupil size, fix_X_angle, fix_Y_angle, saccade duration, saccade average velocity, saccade angle.On the basis of research above, this article carries out the experimental study on drivers'visual characteristic in the real environment of mountain road and urban road. Eye movement parameters are recorded with eye movement tracking device to compare what kind of difference the drivers'visual search has in the different road traffic environment.Results indicate that, all of the forms of drivers'eye movement in the driving process take fixation primarily. Because of two different road traffic environment, drives change their search strategy with the transportation environment. Transportation environment reveals no significant effect on pupil size, fix_Y_angle, saccade duration; but reveals significant effect on fixation duration, fix_X_angle, saccade average velocity, saccade angle.