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类型 基础研究 预答辩日期 2018-03-03
开始(开题)日期 2016-05-31 论文结束日期 2018-01-02
地点 显示中心一楼会议室 论文选题来源 973、863项目     论文字数 6.4 (万字)
题目 不同显示技术与照明环境对视疲劳影响研究
主题词 LED光源,高动态范围显示,视疲劳,视疲劳指标,照明环境
摘要 近年来,随着各种新型显示技术的涌现,一方面丰富了人们视觉感知的形式和内容,促进了信息社会的快速发展。另一方面各类显示器件的广泛应用和人们对信息设备的过度依赖,使得视觉健康问题日益突出,其中视疲劳是影响视觉健康性能的最关键因素之一。同时,随着LED光源的迅猛发展,人们对相应的照明环境的要求也越来越高。但是,LED应用到室内照明存在的一些可能会影响健康安全的问题,如眩光、较高的蓝光成分等,使得照明的安全舒适性问题再次受到关注。 论文通过主观问卷、视功能参数和生理信号等多参数融合的方法,在确定有效视疲劳评测指标基础上,针对高动态范围显示技术和白光LED光源引起的视疲劳问题展开了相关研究。 研究了在LED光源和传统荧光灯照明环境下,长时间(8小时)观看显示终端引起的视疲劳情况。结果显示,两种光源情况下视疲劳程度均随着时间的增加而增加;与荧光灯相比,LED灯虽可引起显著高的调节近点、血氧、最佳矫正远视力和心率变异性中高频能量值的变化以及显著较低的眼干程度和眨眼幅值的变化,但效应较小。8小时的显示终端(VDT)作业,LED光源和荧光灯引起的视疲劳程度均较弱,介于轻微和中等之间。可见,LED光源可用于办公室的照明。在此基础上,建立了在LED照明环境下长时间观看显示终端视疲劳评估/预测模型,并对该模型进行了简化。验证实验结果显示,简化模型同样具有较高的精度。该模型可以很好的评估当前视疲劳的程度,还可以通过短时间测量的数据来预测长时间视疲劳的情况,进而避免了长时间测量数据的麻烦。 研究了LED光源不同照度(300lx、600lx、1200lx)环境下长时间(8小时)进行VDT阅读和纸质书阅读产生的视疲劳情况。结果表明,视疲劳程度随着时间的增加而加剧;与纸质书阅读相比,VDT阅读产生的视疲劳更严重;而在300lx~1200lx照度范围内,照度对视疲劳的影响较小。 研究了高动态范围与标准动态范围显示模式对显示质量和视疲劳的影响。高动态范围图像的图像质量、图像对比度、清晰度、临场感、喜好度、自然度和舒适度显著性地高于标准动态范围的图像,但色彩饱和度显著性地低于标准动态范围的图像。而显示模式对视疲劳的影响程度较小,相比于标准动态范围显示,高动态范围显示显著性地引起较高程度的“眼睛疲劳”(临界阈值0.05附近)和心率变异性的低频能量。1小时的高动态范围/标准动态范围视频产生的视疲劳程度均较低。在此基础上,论文对观看高动态范围显示的照明环境进行了优化。结果表明,舒适的照明环境可有效缓解显示器给视觉功能带来的影响,但是对生理体征的影响甚微。基于以上研究,用显示模式、照明环境作为输入层变量,最佳矫正远视力、眨眼次数和心率变异性中低频能量值作为输出层变量,疲劳和不疲劳两种视疲劳程度作为隐含层变量,构建了基于贝叶斯网络的视疲劳模型,提高了识别视疲劳的准确性。
英文题目 STUDY ON THE VISUAL FATIGUE CAUSED BY DISPLAY TECHNOLOGY AND AMBIENT ILLUMINATION
英文主题词 LED light source, High-Dynamic Range Display, visual fatigue, visual fatigue indicator, ambient illumination
英文摘要 In recent years, the invention of new display technologies not only has enriched the way and content of visual perception, but also has promoted the development of information society. However, with the widely use of various displays and the excessive reliance on information equipments, visual health has become a more and more important issue. Visual fatigue is widely regarded as one of the key factors influencing on visual health. Besides, with the rapid development of LED light sources, the requirement for the corresponding ambient illumination has become more and more critical. But for indoor lighting, LEDs have some problems which may affect people’s health, like glare and higher proportion of blue light. So the safe and comfortable issue is once again in the spotlight. In this dissertation, the research for the visual fatigue caused by High-Dynamic Range (HDR) display and white LED light source has been carried out though the combination of subjective questionnaire, opthalmological parameters and physiological signals which are confirmed effectively. The visual fatigue caused by long-term (8h) visual display terminal (VDT) work under fluorescent and LED luminaire has been investigated. The results show that visual fatigue becomes more serious with increasing time spent at VDT work under the two light sources. Compared to fluorescent luminaire, the LED luminaire produces significantly greater near point accommodation, blink amplitude and oxygen saturation but less “dry eyes” symptom, best corrected distance visual acuity and high frequency electrocardiogram power as time passed, but all are of small effect size. Although the participants carry out eight hours of VDT work under the two light sources, at the end the symptom “tired eyes” is rated as moderate while all the other reported symptoms are rated as slight. Thus, LED light source could be used in office lighting. On this basis, a model for evaluating or predicting visual fatigue under LED light sources has been developed. And a simplified model which also shows high accuracy is proposed as well. Using these models visual fatigue could be well evaluated, and long-term measurement can be avoided and instead, predicted by short-term evaluation results. The influence of long-term (8h) light effect on the visual fatigue for VDT and paper reading tasks under different illuminance (300lx, 600lx, 1200lx) of LED light source has been explored. The results show that the visual fatigue increases with time. In comparison with paper reading tasks, VDT reading task could induce more severe visual fatigue. Within the range of 300 - 1200lx, the impact of illuminance on visual fatigue is small. The effect of HDR and Standard-Dynamic Range (SDR) display on display quality and visual fatigue has been investigated. The results show that the image quality, image contrast, sharpness, immersion, preference, naturalness and comfort of HDR image are significant higher than SDR image’s. And the results of color saturation show the opposite. HDR display causes more “tired eyes” symptom (around the critical threshold of 0.05) and low frequency electrocardiogram power, compared with SDR display. That is, the impact of display format on visual fatigue is slight. The visual fatigue occurring after one hour of HDR display and SDR display is rather small. On that basis, the ambient illumination for watching HDR display is tried to be optimized. The results show that the optimized ambient illumination could alleviate the impact of the display on visual system effectively, but not for the physiology. By the above research, a visual fatigue recognition model based on Bayesian Network is proposed, which takes display format and ambient illumination as the variables of the input layer of the model; regards best corrected distance visual acuity, eye blink and low frequency electrocardiogram power as the variables of the output layer; and uses soberness and fatigue as the variables of the hidden layer. It could increase the accuracy of visual fatigue recognition.
学术讨论
主办单位时间地点报告人报告主题
东南大学显示中心屠彦教授组 2016.11.3 显示中心三楼会议室 王莹 三维显示视疲劳文献综述
东南大学显示中心 2014.3.24 显示中心一楼会议室 王莹 Long-term light effect-不同光源视疲劳研究-预实验
东南大学显示中心 2014.9.15 显示中心一楼会议室 王莹 Long-term light effect-不同光源视疲劳研究-正式实验
东南大学显示中心 2015.3.25 显示中心一楼会议室 张春 Long-term light effect-不同光源视疲劳研究-模型验证实验
东南大学显示中心 2015.10.12 显示中心一楼会议室 张春 Long-term light effect-不同照度视疲劳研究
东南大学显示中心屠彦教授组 2016.3.1 显示中心三楼会议室 王莹 三维立体显示
东南大学显示中心 2016.4.11 显示中心一楼会议室 王宝宝 Long-term light effect-不同年龄实验任务视疲劳研究
东南大学显示中心屠彦教授组 2016.10.12 显示中心三楼会议室 王莹 不同照明光源下的视疲劳
     
学术会议
会议名称时间地点本人报告本人报告题目
IMID 2016 2016.8.23-26 韩国济州岛ICC Jeju Evaluation the visual fatigue caused by 3D with and without crosstalk
视觉健康创新发展国际论坛 2017.7.27-30 浙江杭州国际博览中心 Influence of reading tasks on the visual fatigue under different illumination levels
     
代表作
论文名称
Visual fatigue following long-term VDT work under different light sources
Change of subjective and ophthalmological fatigue during long-term VDT work
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
王鸣 正高 教授 博导 南师大
蒯曙光 正高 研究员 博导 华东师范大学
李青 正高 教授 博导 东南大学
李晓华 正高 教授 博导 东南大学
张雄 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
王莉莉 副高 副教授 东南大学