Fourier Techniques for Optimizing Symbol Highway Sign Legibility
نویسنده
چکیده
Symbol (i.e.,"pictorial") highway signs yield legibility distances which are on average twice as great as those achieved for their text sign counterparts. Howevcr. the relative superiority of symbl signs is neither uniform nor universal. Some symbol signs are legible from 3-times as far away while other p r l y designed symbol signs can be recognized at only half the distance of their textual equivalents (Jacobs. Johnston md Cole. 1975).
منابع مشابه
Optimizing the Legibility of Symbol Highway Signs
Introduction Symbol (i.e., "pictorial") highway signs yield legibility distances which are on average twice as great as those achieved for their text sign counterparts. However, the relative superiority of symbol signs is neither uniform nor universal. Some symbol signs are legible from 3-times as far away while other poorly designed symbol signs can be recognized at only half the distance of t...
متن کاملUsing the "Blur Tolerance" Technique to Predict and Optimize the Legibility Distance of Symbol Highway Signs
This study investigates the hypothesis that variations in symbol sign legibility distance can be accounted for on the basis of a sign's dependence upon high spatial frequency contours to convey critical information. Using digital image processing techniques, highway signs were blurred to remove all high spatial frequency information. A blur recognition threshold was established for each experim...
متن کاملAge Differences in the Legibility of Symbol Highway Signs as a Function of Luminance and the Presence of Glare: A Preliminary Report
Three experiments were conducted to investigate the effects of adults aging upon the legibility of simulated symbol highway signs. Each experiment employed a different set of lighting conditions: (1) daytime luminance, (2) nighttime luminance, and (3) nighttime luminance with glare. Young (ages 18-25) and middle-aged (ages 40-55) observers demonstrated small reductions in legibility when lumina...
متن کاملDriver Eye Fixation and Reading Patterns while Using Highway Signs under Dynamic Nighttime Driving Conditions: Effects of Age, Sign Luminance and Environmental Demand
The purpose of this study was to quantify real-world highway sign reading behavior while driving at night. Sign reading behavior was assessed using traditional self-report augmented by an in-vehicle eye tracking system. Good agreement was found between eye movement data (last-look distance) and verbal report measures of sign legibility distance (r = 0.9). Significant reductions in legibility di...
متن کاملEffects of Driving Speed and Sign Reflectance on Nighttime Highway Sign Legibility Distance and Reading Time Requirements
Nighttime highway sign legibility distance was evaluated as drivers maintained speeds of 5 versus 60 MPH. Effective legibility distance fell by approximately 30% when driving at high speed (114.9 versus 81.2 m at 5 and 60 MPH, respectively; F(1,9) = 48.6, p < 0.001). This finding suggests that past research, usually conducted under static viewing conditions (i.e., less than 5 MPH), probably ove...
متن کامل