交通標識の見え方

抄録

This paper reports the seeing properties for traffic signs by blurred vision, When a deteriorated eye of anaged person, a non corrected near-sighted eye, or peripheral vision is used to observe traffic signs, this investigation is to discover what spatial frequency components of the sign pattern is effective to recognition. There are many traffic signs, such as limit of car speed, warnings, and so on. For this study, 18 signs were chosen from 46 signs. Chosen sign patterns were representative of the typically recognized patterns. Every patterns were previously blurred by Macintosh computer to simulate blurred vision. The patterns were then displayed for a sufficient time to 10 subjects. 9 students were all 20 years of age and 1 aged person was 50 years of age. None of these subjects had any special defect to their eyes. Students were all corrected by glasses, if they were near sighted. An aged subject had no glasses.
For speculation of the sign patterns features, each blurred pattern was dissolved by Fourier Transformation by the computer.