Ambient light robust gamut mapping for optical see-through displays

Lee, Kang Kyu; Kim, Jae Woo; Ryu, Je Ho; Kim, Jong Ok

doi:10.1364/oe.391447

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Generally, non-oxidative blue filtering is inevitably accompanied by several negative consequences, including complicated control circuits and algorithms [21], distorted display-input signals [22], and reduced color-deviation levels [23][24][25]. In this study, we measured FVD variations in different color-gamut coverages and color-deviation levels, which were caused by the non-oxidative blue filtering, during screen-watching tasks in experiences with human subjects.…”

Section: Introductionmentioning

confidence: 99%

Fundus-Vascular Responses to Color Deviation Caused by Non-Oxidative Blue Filtering

Cai

Hao

Zeng

et al. 2022

Oxidative Medicine and Cellular Longevity

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Aims. Short-wavelength blue light damaged retina by the oxidative stress in the retinal pigment epithelial (RPE) cells. Filtering blue light from screen could reduce blue hazard, whereas it inevitably altered color-gamut coverage and color-deviation level. Although abnormal fundus-vascular density (FVD) sometimes indicated fundus disease, few researchers noticed its responses to the variation of color-gamut coverage and color-deviation level. Methods. In this study, we performed cellular experiments and analyzed the RPE cell viabilities (CVs) in spectrums with different blue (455-475 nm) ratios to describe the corresponding oxidative-stress levels. Further, we investigated the effects of color-gamut and deviation on FVD variations during the screen-watching task using human factor experiments with 30 participants (university students, including 17 males and 13 females, 21 to 30 years old). Results. RPE CVs were similar in different spectrums, implying that non-oxidative blue filtering hardly contributed to CV improvement. Color-deviation level seems to induce more significant effects on the visual function compared to color-gamut coverage, and MTF and FVD presents similar variation trends during the visual task. Conclusion. Oxidative-free blue filtering contributed little to decrease retinal oxidative stress yet caused color-deviation increase, which caused significant FVD reduction.

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Section: Introductionmentioning

confidence: 99%

Fundus-Vascular Responses to Color Deviation Caused by Non-Oxidative Blue Filtering

Cai

Hao

Zeng

et al. 2022

Oxidative Medicine and Cellular Longevity

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“…Their results recommended using white, yellow, green, and cyan text [5]. A robust gamut mapping algorithm, including lightness mapping (LM) and chroma reproduction, was proposed by Lee et al to reduce color distortion for bright ambient light [6]. Moreover, two approaches, the changes of the color symbols and the addition of color outline to symbols for HUD information, were adopted for visibility enhancement determined by the similarity between HUD information and background colors [7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Text-Background Lightness Combination on Visual Clarity Using a Head-Up Display under Various Surround Conditions and Different Age Groups

Huang

Mao

et al. 2023

Applied Sciences

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Up until now, head-up displays (HUDs) have been installed in front of the driver’s seat to provide drivers with auxiliary information. It may be used in various surroundings, ranging from very dark to very bright environments, such as daylight. A suitable text-background lightness combination can improve the driver’s visual clarity and efficiency when identifying displayed information to raise driving safety. Although many kinds of HUDs are designed to improve visual clarity by adjusting brightness, few studies have investigated the influence of the text-background lightness combination of a HUD on visibility, especially as the lighting level of the driving condition changes dramatically. In the study, 60 observers, comprising 20 young, 20 middle-aged, and 20 older participants, evaluated the visual clarity of 20 text-background lightness combinations on a HUD using paired comparison methods under dark and daylight surroundings (i.e., 300, 1500, and 9000 lx conditions). As a result, the combination of white text on a black background and black text on a white background presented the most significant preference and the best visual clarity under dark and daylight surroundings, respectively, improving visual safety when driving.

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“…When images are presented through optical see-through (OST) devices, such as transparent or AR glasses, in ambient conditions, both the light from the images on the OST devices and the light from the real-world background enter the viewers' eyes. Most studies on the brightness perception of Augmented Reality (AR) images assume that only AR object images are superimposed on the real-world background (Figure 1-(a)) [1][2][3][4]. These studies conduct experiments to investigate the contrast effect between the AR object in the AR images and the real-world background.…”

Section: Introductionmentioning

confidence: 99%

The Effect of an Ambient Contrast of AR (Augmented Reality) Images on Brightness Perception

Kim,

Seo,

2023

cic

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In an ideal AR device, only the AR object image should appear in the real environment. However, certain AR devices, such as those using a half mirror, also present the AR background surrounding the AR object due to the transmittance of the half mirror. This might be perceived as a two-dimensional display image overlapping onto the real environment. In this scenario, the perception of brightness might differ from cases where only an AR object is superimposed on the real-world background. To explore the brightness perception of AR images presented by AR glasses with half mirrors, we conducted two psychophysics experiments. In Experiment 1, using a single pair of AR glasses, we observed the brightness perception of AR images under various correlated color temperatures (CCTs) for exterior lighting. Participants perceived the AR image to be brighter than the reference image with the same luminance. The CCT of the exterior lighting had no significant effect. In Experiment 2, we investigated the effect of the AR background on the brightness perception of AR images using two pairs of AR glasses with different transmittances (35% vs. 70%). Participants perceived AR images to be brighter than the reference when using glasses with lower transmittance. These results suggest the interaction effect between the image contrast and the ambient contrast on brightness perception in AR glasses with half mirrors.

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Ambient light robust gamut mapping for optical see-through displays

Cited by 6 publications

References 19 publications

Fundus-Vascular Responses to Color Deviation Caused by Non-Oxidative Blue Filtering

Fundus-Vascular Responses to Color Deviation Caused by Non-Oxidative Blue Filtering

Investigation of Text-Background Lightness Combination on Visual Clarity Using a Head-Up Display under Various Surround Conditions and Different Age Groups

The Effect of an Ambient Contrast of AR (Augmented Reality) Images on Brightness Perception

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