基于眼动特征的可变信息标志视认性影响研究

为了补充可变信息标志在昼夜交替时的亮度要求，改善在昼夜交替时的视认效果，开展了环境照度和字体亮度对可变信息标志视认性的影响研究。首先，通过实测环境照度和字体参数实验，确定影响视认性的关键参数；其次，开展视认可变信息标志眼动实验，分析字体亮度和环境照度对视认性的影响；最后，建立最佳字体亮度与环境照度的最优匹配函数。结果表明：在200,400,600,800,1 000 lx环境照度下，红色字体最佳显示亮度分别为170,200,230,260,270 cd/m²,黄色字体最佳显示亮度分别为185,225,265,305,325 cd/m²,绿色字体最佳显示亮度分别为200,240,280,320,340 cd/m²;在达到最佳视认效果的情况下，字体亮度随环境照度的增大而增大，且增长速率逐渐变小。研究所得影响规律及字体亮度与环境照度最优匹配函数可得不同环境照度下不同颜色字体的最佳显示亮度，为昼夜交替时不同环境照度下不同颜色字体显示亮度的参数设置提供了依据，对提高城市道路交通可变信息标志的视认性、降低事故率具有重要意义。

Research on the influence of variable information markers on recognition based on eye movement features

In order to supplement the brightness requirements of the variable information signs at the alternation of day and night, and improve the visual recognition effect at the alternation of day and night, the effects of environment illumination and font brightness on the visual recognition of variable information signs were studied. Firstly, through the measured environment illumination and font parameter experiments, the key parameters of the visual impact experiment were obtained. Secondly, the eye movement experiment of visual recognition change information signs was carried out to analyze the effects of font brightness and environment illumination on visual recognition. Finally, the optimal matching function between the optimal font brightness and the environment illumination was established. The results show that under the environment illumination of 200, 400, 600, 800 and 1 000 lx, the optimal display brightness of red font is 170, 200, 230, 260 and 270 cd/m2, the optimal display brightness of yellow font is 185, 225, 265, 305, 325 cd/m2, and the optimal display brightness of green font is 200, 240, 280, 320, 340 cd/m2, respectively. In the case of achieving the best visual effect, the brightness of the font increases with the increase of environment illumination, and the growth rate gradually decreases. Research result affects the best display brightness of different color fonts under different environment illuminations under different environment illuminations, and provides a basis for the parameters of different color fonts to display brightness under different environmental illumination when the day and night alternation are alternately. It is of great significance to improve the visualization of urban road traffic variable information logo and reduce the accident rate.