Yandan Lin

Fudan University · Dept. Illuminating Engineering& Light Sources. School of Information Science and Engineering

Purpose. Involuntary physiological responses offer an alternative means to psychophysical procedures for objectively evaluating discomfort glare. This study examines eye movement and pupil size responses to discomfort glare using new approaches to analysis: relative pupil size and speed of eye movement. Methods. Participants evaluated discomfort g...

The stroboscopic effect from LED light sources can become considerable in working environments. Therefore, this study aims to explore the short-term health effect of a temporal light artefact. The experiment was carried out featuring 10 university students. Three frequencies and three modulation depths were assessed. Psychological reaction was eval...

Light has been found to affect the circadian clock of the human body. This study aims at exploring the proper light scheme for improving performance and alleviating the negative effects of phase-advance jet lag. Herein, the light intervention intensity during an 8-h working time after a simulated eastward flight is set as a variable. 27 healthy you...

Light is an important external factor that affects human circadian rhythms. This study aimed to explore the effects of different dimensions of diurnal light exposure on the physiological circadian phase shift (CPS) of the human body. A strict light exposure experiment with different timing schemes (8:00–12:00, 13:00–17:00, 18:00–22:00), durations (...

The cockpit is a compact space comprised of various light-emitting devices. The light from different devices interferes and overlaps on the target surface. The light distribution requirements of different target surfaces are different. A suitable decision-making process is required to simultaneously meet the requirements of multiple target surfaces...

Spectral imaging plays a crucial role in various fields, including remote sensing, medical imaging, and material analysis, but it often requires specialized and expensive equipment, making it inaccessible to many. Its application is also limited by the interdependent constraints of temporal, spatial, and spectral resolutions. In order to address th...

The miniature fiber optic spectrometer is smaller, cheaper and has a wide range of applications. However, the measurement error is larger. In order to solve this problem, the adaptive iterative optimization (AIO) method for spectral calibration is proposed. In this study, a trinity neural network model is built based on spectral wavelength segmenta...

Narrow band imaging is an established non-invasive tool used for the early detection of laryngeal cancer in surveillance examinations. Most images produced from the examination are useless, such as blurred, specular reflection, and underexposed. Removing the uninformative frames is vital to improve detection accuracy and speed up computer-aided dia...

It is a great challenge to rendering glare on image as the current rendering algorithms did not consider well the refraction of human eyes, thus the effect of rendering, in some critical application such as vehicle headlamps, is not real and may affect the safety evaluation. The traditional glare rendering algorithm relies on a large number of hand...

Image quality assessment (IQA) model is designed to measure the image quality in consistent with subjective ratings by computational models. In this research , a valid no reference IQA (NR-IQA) model for color image sharpness assessment is proposed based on local color difference map in a color space. In the proposed model, the absolute color diffe...

The self-luminous cockpit displays need to be adaptive to a wide range of ambient light levels, which changes from very low illuminance to very high levels. Yet, current studies on evaluation and luminance setting of displays in bright surroundings are still limited. In this study, a three-dimensional visual ergonomic experiment was carried out to...

Although bright light therapy (BLT) has been widely used in the clinical treatment of depression, the antidepressant effect of BLT is not well understood. Considering the connection between depression and disrupted circadian rhythm, we assumed the model of human circadian phototransduction could be more accurate in evaluating the efficacy of BLT fo...

Illumination preference models are usually defined in a static scenery, rating common-colored objects by a single scale or semantic differentials. Recently, it was reported that two to three illumination characteristics are necessary to define a high correlation in a bright office-like environment. However, white-light illumination preferences for...

This paper investigated colour discrimination based on current available indexes, and predictors were proposed for global and targeted colour scenarios. Thirty participants conducted the Farnsworth–Munsell 100 hue test under 21 lighting conditions. The experiment results revealed that the distribution of total error score (TES) and adjusted total e...

External human-machine interaction (eHMI) road projections are a new feature for automotive lighting to improve vehicle communication with other road users. These modalities are used to draw users’ attention and awareness to specific situations. However, such advanced capabilities are still being debated to be used on the road in the context of whe...

Recent studies revealed that the visual perception of temporal light modulation (TLM), particularly the visibility threshold, were illuminance dependent and subjects exhibited significantly different response at 50 lx. Some novel studies suggested TLM at 50 lx could be particularly useful in terms of promoting alertness and increasing comfort. Ther...

The objective image quality assessment (IQA) method was developed to replace subjective observer image quality evaluations in various applications. A reliable full reference color IQA method that allows reference and distorted images to be compared in a symmetric way is designed via three fusion steps described in this article. The three fusion ste...

The 6D Pose estimation is a crux in many applications, such as visual perception, autonomous navigation, and spacecraft motion. For robotic grasping, the cluttered and self-occlusion scenarios bring new challenges to the this field. Currently, society uses CNNs to solve this problem. The CNN models will suffer high uncertainty caused by the environ...

Today, up to hundreds of RGB and W-LEDs are positioned in a vehicle’s interior context and are able to be individually controlled in intensity, color and sequence. However, which kind of illumination distracts or supports car occupants and how to define such a modern illumination system is still under discussion and unknown. For that, first a defin...

Background Blue-enriched white light at night has the potential to delay the circadian rhythm in daily life. This study was conducted to determine whether the use of high correlated color temperature (CCT) light at home at night is associated with delay of sleep timing in university students. Methods The survey was conducted in 2014–2015 in 447 un...

Non-image-forming lighting effects reveal the multiple circadian influences of light on human behaviours. A psychophysical experiment was conducted in two sessions (morning and afternoon) for 60 days. The experiment was designed to explore the influence of different circadian lighting by spectral tuning with controlled CCT and illuminance on attent...

A low sintering temperature glass based on B2O3–Na2O–Al2O3 system was studied as a matrix for embedding phosphors to fabricate color tunable white LEDs. Red-emitting-phosphor-in-glass (R−PiG) was prepared by co-sintering glass frits and CaAlSiN3:Eu²⁺ (CASN:Eu²⁺) phosphors at 480 °C. Then, Y3Al5O12:Ce³⁺ (YAG:Ce³⁺) yellow phosphors were added to obta...

Bipolar disorder due to family history, drug abuse and other factors is recurrent and is difficult to be cured. Traditional medicine treatment has physical and mental damage to patients. The effect of psychotherapy varies from person to person. While light therapy is simple and effective. The current non-visual effects of light indicate that light,...

During the last decade, hundreds of articles have been published on human factors involves in Autonomous Vehicles (AV). This survey presents a summary of published articles on the interior Lighting environment of Autonomous Vehicles. We mainly focus on the in-vehicle lighting and its application in Autonomous Vehicles like Taking over Request (TORs...

During the last decade, hundreds of articles have been published on human factors involves in Autonomous Vehicles (AV). In this survey, we briefly summarize 20 published articles on Takeover requests (TORs) modalities in Autonomous Vehicles. We mainly focused on Takeover requests (TORs) modalities, while the driver is engaged in non-driving related...

Image quality assessment (IQA) model is designed to measure the image quality in consistent with subjective ratings by computational models. In this research, a reliable full reference color IQA model is proposed by combining the Visual saliency with Color appearance (VC) similarity, gradient similarity and chrominance similarity. Two new color app...

This paper presents an optimized lighting design method of LED ring array structure for machine vision, which can obtain high quality images. The proposed method consists of imaging theory and Taguchi method to obtain uniform illumination distribution. According to the imaging theory, the relationship between image contrast and illumination uniform...

With the rapid development of color image contents and imaging devices in various kinds of multimedia communication systems, conventional grayscale counterparts are replaced by chromatic ones. Under such a transition, the image quality assessment (IQA) model needs to be built by subjective visual measurement, designed in accordance with the results...

The nominal composition of Al2O3-Ce:Y3Mg1.8Al1.4Si1.8O12 (A-Ce:YMASG) ceramic phosphors was fabricated by the vacuum sintering technique. The introduction of Al2O3 as a second phase partially enters the crystal lattice, which was confirmed by the composition changing of the samples through x-ray diffraction measurement. An impurity phase of Y4MgSi3...

Haar-like feature is the main way to detect some special features. To deal with Haar-like feature detection under different light environment, some experiments were designed according to illumination condition based on machine vision. During the experiments, face feature was chosen as the represent Haar-like feature on the objects. For the low illu...

Al2O3-Ce:Tb3Al5O12(TAG) composite ceramics have been synthesized by solid-state vacuum sintering for the application of high efficiency warm white light illumination. The microstructures and fluorescent properties were investigated systematically. Through the introduction of Al 2 O 3 particles, the luminous efficiency (LE) of Ce:TAG ceramics based...

In this paper, the chemical composition of Y3Al5O12 was modified to Ce:(MgyY2.99-y) (Al5-ySiy)O12 (MYASG) and Ce:Y2.99(MgxAl5-2xSix)O12 (YMASG) through the Mg²⁺-Si⁴⁺ substitution for Y³⁺-Al³⁺ and Al³⁺-Al³⁺, respectively. The increasing (decreasing) lattice constants, downward (upward) shift of Raman peaks and shorter (longer) luminescence lifetime...

To evaluate the combined effect of illuminance and frequency on attention, three illuminance levels, 50lx, 150lx and 500lx and three frequency levels, 100Hz, 300Hz and 1000Hz were analyzed. A within-subject design was adopted, and data were subjected to factor analysis and MANCOVAs. It was found out that illuminance significantly affected subjects'...

(Tb,Gd)3Al5O12: Ce3+ (Ce: TGAG) transparent phosphor ceramics with different concentrations of Gd-doping were fabricated for the first time through a solid state reaction. The maximum emission peak of Ce3+ shifts from 550 nm to 570 nm in Ce:TGAG and the emission intensity of Ce3+ was also greatly increased. With an increasing red component in fluor...

Y3Al5O12:Ce³⁺/Mn²⁺/Si⁴⁺ phosphor ceramics were fabricated by solid state reaction. Red emission is obtained, which is attributed to the Mn²⁺:⁴T1→⁶A1 spin-forbidden transition under the excitation of 450 nm via the efficient energy transfer from Ce³⁺ to Mn²⁺.The green emission (535 nm) originating from Ce³⁺ and the orange emission (587 nm) from Mn²⁺...

This paper investigated atmosphere perception as dynamic white lighting varied in illuminance or correlated colour temperature in different directions and with different functional forms of change. Fifteen Chinese observers evaluated 32 dynamic lighting stimuli. A 13-scale questionnaire was employed for each stimulus. Factor analysis was adopted to...

In order to verify the applicability of the discomfort glare evaluation model of small size light source to LED, the discomfort glare is generated by white LED of two kinds of color temperature. The experiment is conducted under four kinds of glare luminance and viewing angles. Observers are asked to give a deBoer rating score under each condition....

This paper studies the solar radiation distribution under solar panels in the effective growth period of crops by building the model of photovoltaic power station with Ecotect. The simulation results show that the area beneath the photovoltaic panels receives less solar irradiation. The area covered with no solar panel reveals better irradiation co...

Visual comfort as well as physical and mental influences of lighting is becoming more and more essential in people's life. The rising demand of flight make the development of cabin mood lighting a necessity. In the thesis, a background research was firstly conducted and a large scale ergonomic questionnaire was undertaken expecting to learn about p...

With the development of LED technology, spectral tuning and spectral engineering are becoming more and more popular. The spectra are generally engineered to enhance the visual or non-visual response introduced by optical radiation. Color quality, an important component of lighting quality, attracts considerable attention of the LED manufacturers. T...

Daylight simulators (i.e., D50, D55, D65, and D75 simulators) play an important role for industrial applications, such as surface color industry, recipe formulation, and graphic arts industry. Conventional light sources, including xenon lamps, tungsten-halogen lamps, and fluorescent lamps, have been used as daylight simulators. In this article, a g...

High efficiency LEDs are widely used to replace fluorescent lamps due to outstanding energy efficiency, long operational life and affordable manufacturing cost. LED contains dual fundamental applications, which are lighting illumination and Visible Light Communication (VLC). Although VLC provides several advantages when compared with RF wireless co...

The purpose of this study is to find out the effects of light-emitting diode (LED) lighting on elderly people's color discrimination and preference, to improve the lighting environment for elderly people. In this study, experiments were conducted under LED lighting with two different spectra (with color-correlated temperature [CCT] of 2800K and 600...

A psychophysical experiment was conducted to evaluate the performance of various colour spaces, colour difference formulae, colour matching functions and colour fidelity measures in predicting perceived colour differences. Ten observers evaluated the colour differences of 20 colour samples under 11 pairs of light sources. The results suggest that t...

This paper reports two analyses carried out to investigate the influence of facial expression choice in work exploring interpersonal judgements and lighting for pedestrians. An experiment was conducted to compare performance on a facial recognition task using target and reference images of either the same or different expressions: these data demons...

Intercultural differences between user preferences of illuminant colour temperatures2 (e.g. warm white, neutral white or cold white) are reported in literature. The present study concentrates on a new aspect of white tone preference: its object scene dependence (red objects, blue objects and colourful scenes) along the Chinese-European geographical...

The preference for the chromaticity of high illuminance, high colour rendering LED illumination of different scenes was investigated for Chinese and European observers. An experiment about the preference for perceived illumination chromaticity was conducted with the same multi-LED light engine, same viewing booth and same coloured objects transport...

The method for evaluating the colour rendering of light-emitting diode sources is controversial, especially for the appearance of human complexions. A psychophysical experiment was conducted using Chinese models to examine the effect of various illumination settings, characterized by two levels of preferred skin colour index and four levels of corr...

This study aims to investigate the effect of combination of color accent light and white ambient light on the people's preference for living room considering the activities. 60 observers participated the two parts of the study. A psychophysical evaluation experiment was conducted to examine the effects of various illumination settings on preference...