光环境对使用VDT观看动态视频的视觉感受影响

Effect of light environment on visual perception of dynamic video viewing with VDT

在室内使用视觉显示终端(visual display terminal,VDT)观看视频的场景中,VDT屏外背景光可以降低屏幕内外明暗对比产生的不适,同时光的颜色与亮度属性会影响人的视觉感受。本研究探索室内光环境对VDT观看动态视频的视觉感受影响,以营造能够提升视觉感受的VDT观影光环境。基于心理物理学方法进行人因工程实验,室内光环境以光的颜色/色温和亮度属性作为自变量:实验一设置3种彩光颜色与3种白光色温条件,实验二设置8种亮度条件。视频材料根据自定义动态程度分为高动态度影片和低动态度影片,测量受试者在不同光环境条件下使用VDT观看视频的视觉感受。研究发现,彩光更被偏好,相比白光具有更低疲劳度、更高舒适度及其他视觉感受,其中绿光照明条件下最舒适;背景亮度在9 cd/m~2~30 cd/m~2内最为偏好,视觉感受最佳亮度范围为16 cd/m~2~54 cd/m~2,包括较低的疲劳度、较高的舒适度、氛围、显示屏颜色显示质量,超过330 cd/m~2时视觉感受最差。实验结论为室内光环境对人视觉感受的影响研究提供了参考,为提升VDT观看动态视频视觉感受用途的照明设计提供了现实的指导建议。

In indoor video viewing scenarios using visual display terminal(VDT),the VDT off-screen background light can reduce the discomfort caused by the contrast between light and dark inside and outside the screen,and the color as well as luminance properties of light will affect visual perception of people.The effect of indoor light environment on the visual perception of dynamic video viewing with VDT was explored,so as to create a VDT viewing light environment that can improve visual perception.The human factor engineering experiments were carried out based on psychophysical method,and the indoor light environment took the color/color temperature and luminance of the light as independent variables.In experiment 1,3 kinds of color colors and 3 kinds of white color temperatures were set.In experiment 2,8 kinds of luminance conditions were set,the video materials were categorized as high-dynamic video and low-dynamic video according to dynamic level,and the visual perception of the subjects watching the video using VDT under different light environment conditions was measured.The results show that the colored light is preferred,which conducts lower fatigue,higher comfort and other visual feelings than white light,among which the green light is the most comfortable condition.The luminance range of 9 cd/m2~30 cd/m2 is the most preferred,the condition range with best visual perception is 16 cd/m2~54 cd/m2,conducting lower fatigue,higher comfort,atmosphere and display color quality,and visual perception is worst when the luminance exceeds 330 cd/m2.The experimental results provide a reference for the study of the effect of indoor light environment on human visual perception,and provide practical guidance and suggestions for lighting design for improving visual perception of dynamic video viewing with VDT.