期刊名称：International Journal of Computer Science and Network Security
印刷版ISSN：1738-7906
出版年度：2011
卷号：11
期号：8
页码：66-71
出版社：International Journal of Computer Science and Network Security
摘要：Outdoor signboards on the street provide not only advertising but also effective scenery of the town, and they are useful for the activation of the town. Sometimes they have different faces according to the effect of the lighting systems in daytime and evening. In this experiment, we use lighted signboards to examine how human eyes see ��object colors�� under the dark conditions. Advertising signboards that we recognize as ��object colors�� begin to change into ��light source colors��, when it darkens gradually in the evening. When this change occurs, the horizontal illuminance decreases from 1000 to 100 lx. In addition, ��brightness feeling�� and the ratio of ��light source colors�� rise rapidly when the luminance difference between the sky and signboard falls below 200cd/m2.
关键词：Dark adaptation; Object color; Llight source color; Sky luminance; Lighting systems of signboards
