Yandan Lin

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

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 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 (...

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...

Face recognition is one of the interpersonal judgements carried out by pedestrians. Road lighting should enhance the visual component of such judgements after dark. This paper presents experiments carried out using two different procedures, identification and perceived recognition, to investigate why earlier studies have led to inconsistent conclus...

Blurriness is troublesome in digital images when captured under different illumination imaging conditions. To obtain an accurate blurred image quality assessment (IQA), a machine learning-based objective evaluation method for image sharpness under different illumination imaging conditions is proposed. In this method, the visual saliency, color diff...

The proliferation of electric and hybrid vehicles has made it possible for people to read and work in a stationary vehicle for extended periods. However, the current commonly used in–vehicle lighting design is still centered around driving and driving safety. Following recommendations from the literature, a neutral white color band (4000 K–5000 K)...

New type desktop head-up display (HUD) can reduce visual fatigue and protect vision through long viewing distance. In this study, participants evaluated visual performance, fatigue, and discomfort of desktop HUD under two contrast polarity (N = 36) and five display luminance levels (N = 21). A positive polarity advantage was found over negative in...

Light has been demonstrated to influence transient mood states in healthy populations and can be used as a treatment for clinical mood disorders. However, it is still interesting to know whether stimulus with relatively low light levels can moderate the transient mood state of people with depressive tendencies, and what are the effects respectively...

The maturity of kiwifruit is widely gauged by its soluble solids content (SSC), with accurate assessment being essential to guarantee the fruit’s quality. Hyperspectral imaging offers a non-destructive alternative to traditional destructive methods for SSC evaluation, though its efficacy is often hindered by the redundancy and external disturbances...

Various facial colour cues were identified as valid predictors of facial attractiveness, yet the conventional univariate approach has simplified the complex nature of attractiveness judgement for real human faces. Predicting attractiveness from colour cues is difficult due to the high number of candidate variables and their inherent correlations. U...

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...

A novel violet-excitable Na 3 YSi 2 O 7 :Eu ²⁺ green phosphor for a high-quality white LED was developed via salt-flux assistance.

Head-up displays (HUDs), a novel form of virtual display, are characterized by their optical structure as a typical binocular virtual display system. This structure exhibits the effect of binocular parallax on visual perception, especially when diverse depth information is displayed on a screen, which makes the eyes switch between different paralla...

Within this third part of our mini-series, searching for the best and worst automotive in-vehicle lighting settings, we aim to extend our previous finding about white light illumination preferences by adding local cortical area activity as one key indicator. Frontal electrical potential asymmetry, measured using an electroencephalogram (EEG), is a...

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...

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...

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...

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 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...

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...

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...

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...

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...

The nominal composition of Al 2 O 3 - Ce : Y 3 Mg 1.8 Al 1.4 Si 1.8 O 12 (A-Ce:YMASG) ceramic phosphors was fabricated by the vacuum sintering technique. The introduction of Al 2 O 3 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 impuri...

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...