Abstract
In the automobile, various information such as route guidance or road traffic information is provided. Characters and images displayed on a on-board display are increasing. In order to drive safely and smoothly, visibility improvement of on-board display will be more and more important. Development of on-board display which is easy-to-look for older people and robust to environmental change is strongly requested. We propose a method to decide character size and contrast between the character and the background for the condition of displayed characters and symbols. to design on-board display images. This method estimates legibility of the characters based on the spatial frequency property of human vision which vary with the age or environmental luminance. This method will help desiring easy-to-look image of on-board display.
