Citation

Yokoya Y, Soma H, Shimoyama O. Trans. Soc. Automot. Eng. Jpn. 2017; 48(3): 731-737.

Copyright

(Copyright © 2017, Society of Automotive Engineers of Japan)

DOI

10.11351/jsaeronbun.48.731

PMID

unavailable

Abstract

A relation between velocity of a vehicle and its image on a retina of a pedestrian is described based on geometrical optics. Displacement of a vehicle position is decomposed into the tangential and the normal component according to the two-dimensional rotating-frame. The tangential component directly contributes to the perception by the retinal image, while the normal component indirectly contributes by changes in the visual angle through size constancy. It is shown how the magnitude of these two components depends on eye height of a pedestrian, frontal projected area and velocity of an approaching vehicle.

Language: ja

Keywords

Human engineering; Pedestrian; Road crossing; Vision; Visual system