Method of Displaying Characters and Symbols in an On-board Display.
Satoshi Shirai, Yoshinari Matsunaga, Shin Yamamoto, Tomoaki Nakano · The Journal of The Institute of Image Information and Television Engineers · 2002
The given time to gaze at an on-board display is very short from the viewpoint of safe driving. Therefore, the visibility of the display should be better than a general one. The appropriate method for displaying characters and symbols in an on-board display is described. In the condition of a constant surrounding illuminance, the visibility of characters and symbols depends on character complexity and viewing distance. In this method, the character complexity is shown by a two dimensional frequency (linear density). The character complexity and viewing distance are associated with visual acuity, and then the appropriate character size is determined based on the spatial frequency properties. Some experiments have showed that this method is very effective in improving display visibility.