高校多媒体教室光环境视觉清晰度和舒适度评价研究

Study on the Evaluation of Visual Clarity and Comfort in the Light Environment of Multimedia Classrooms in Colleges and Universities

为明确高校多媒体教室光环境学生视觉清晰度和舒适度与环境亮度之间的定量关系,得到多媒体教室光环境以亮度与视觉清晰度和视觉舒适度阈值和影响趋势,本文对多媒体教室光环境的相关影响参数进行了研究。在对我国目前多媒体使用现状分析的基础上,提出以亮度为室内光环境评价的主要参数,进行学生主观评价实验。利用多媒体结合幕布投影方式并利用HDRI技术提取出能反映实验者视觉清晰度和视觉舒适度的亮度范围。最后,分析得到的实验数据,结合心理物理学阈限的操作定义,通过回归分析得到符合多媒体教室光环境中的视觉清晰度和舒适度与亮度对应的函数关系,并计算出阈值和极值点数据。本研究表明:当亮度范围在370.83 cd/m^(2)≤X≤558.47 cd/m^(2)时,同时具有较好的视觉清晰度和较好的视觉舒适度。当亮度对比度接近10∶1时,视觉清晰度最高;当亮度对比度接近5∶1时,视觉舒适度最高,随其数值变化两侧依次递减。本实验研究结果可为今后制定和修订相关法规提供依据,为我国多媒体教室光环境设计提供参考。

In order to clarify the quantitative relationship between students’visual clarity and comfort and ambient brightness in the light environment of multimedia classroom in Colleges and universities,the threshold and influence trend of the light environment of multimedia classroom with brightness and visual clarity and visual comfort were obtained.Firstly,this paper summarizes the influence of light environment in multimedia classroom.Then,on the basis of the analysis of the current situation of multimedia use in China,the subjective evaluation experiment of students is carried out with brightness as the main parameter to evaluate the indoor light environment.The brightness range reflecting the visual clarity and comfort of the experimenter was extracted by HDRI technology.Finally,based on the experimental data and the operation definition of psychophysical threshold,the functional relationship between visual clarity and comfort and brightness in light environment of multimedia classroom was obtained by curve regression,and the relevant data were calculated.The results show that when the brightness range is 370.83 cd/m^(2)≤X≤558.47 cd/m^(2),it has better visual clarity and better visual comfort.Visual clarity is the highest when brightness contrast is close to 10∶1,and visual comfort is the highest when brightness contrast is close to 5∶1,which decreases in both numerical sides.The results of this study can provide a basis for formulating and revising relevant regulations in the future,and provide a reference for the light environment design of multimedia classrooms in China.