Method for measuring the screen luminance, contrast and reflectance of microform readers

1983 ◽  
Keyword(s):  
Luminance Contrast

Fast Image Defogging Algorithm Based on Luminance Contrast Enhancement and Saturation Compensation

2018 ◽  
Vol 30 (10) ◽  
pp. 1925
Author(s):  
Xumin Cao ◽  
Chunxiao Liu ◽  
Jindong Zhang ◽  
Yuhang Lin ◽  
Jinwei Zhao
Keyword(s):  
Contrast Enhancement ◽  
Luminance Contrast ◽  
Image Defogging

Night-time disability glare of constant-light LED traffic monitoring fill light

2021 ◽  
pp. 147715352098226
Author(s):  
X Cai ◽  
L Quan ◽  
J Wu ◽  
Y He
Keyword(s):  
Dynamic Range ◽  
Road Traffic ◽  
Reaction Times ◽  
High Dynamic Range ◽  
Luminance Contrast ◽  
Traffic Monitoring ◽  
Constant Light ◽  
Night Time ◽  
Disability Glare ◽  
Small Targets

Fill light, used to helps cameras capture road traffic conditions at night, can lead to serious visual consequences for drivers. Research on disability glare from LED fill light is scarce and therefore this study explored strategies for controlling disability glare of constant-light LED traffic monitoring fill light. The threshold increment was used as an index to evaluate disability glare. The effective disability glare area of LED traffic monitoring fill light was determined based on high dynamic range technology. According to visual efficacy theory, there is a relationship between disability glare conditions and reaction times. The influencing factors include background luminance, luminance contrast and fill light luminance. The results showed that disability glare was the most intense in a range of 20 m to 30 m in front of LED fill light. To reduce the effect of disability glare on drivers, luminance contrast between small targets and the road surface should be greater than 0.5. The fill light luminance should not be greater than 100,000 cd/m2.

Color and Luminance Contrast Sensitivity Changes in Early- and Late-Onset Strabismic Amblyopia

2006 ◽  
Vol 10 (1) ◽  
pp. 81
Author(s):  
John J. Sloper ◽  
Alison R. Davis ◽  
Majella M. Neveu ◽  
Chris R. Hogg ◽  
Michael J. Morgan ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Late Onset ◽  
Luminance Contrast ◽  
Strabismic Amblyopia ◽  
Sensitivity Changes

Chromaticity contrast, luminance contrast, and legibility of text

1996 ◽  
Vol 4 (3) ◽  
pp. 135 ◽  
Author(s):  
G. P. J. penkelink ◽  
J. Besuijen
Keyword(s):  
Luminance Contrast

Color stimuli perception in presence of light scattering

2006 ◽  
Vol 23 (3-4) ◽  
pp. 597-601 ◽  
Author(s):  
MARIS OZOLINSH ◽  
MICHÉLE COLOMB ◽  
GATIS IKAUNIEKS ◽  
VARIS KARITANS
Keyword(s):  
Visual Acuity ◽  
Light Scattering ◽  
Luminance Contrast ◽  
White Background ◽  
Color Contrast ◽  
Entire Area ◽  
Red Color ◽  
Blue Component ◽  
Different Color ◽  
Landolt C

Perception of different color contrast stimuli was studied in the presence of light scattering: in a fog chamber in Clermont-Ferrand and in laboratory conditions where light scattering of similar levels was obtained, using different light scattering eye occluders. Blue (shortest wavelength) light is scattered in fog to the greatest extent, causing deterioration of vision quality especially for the monochromatic blue stimuli. However, for the color stimuli presented on a white background, visual acuity in fog for blue Landolt-C optotypes was higher than for red and green optotypes on the white background. The luminance of color Landolt-C optotypes presented on a LCD screen was chosen corresponding to the blue, green, and red color contributions in achromatic white stimuli (computer digital R, G, or B values for chromatic stimuli equal to RGB values in the achromatic white background) that results in the greatest luminance contrast for the white–blue stimuli, thus advancing the visual acuity for the white-blue stimuli. Besides such blue stimuli on the white background are displayed with a uniform, spatially unmodulated distribution of the screen blue phosphor emission over the entire area of the screen including the stimulus C optotype area. It follows that scattering, which has the greatest effect on the blue component of screen luminance, has the least effect on the perception of white–blue stimuli.

Investigation of Interactions of Luminance Contrast and Temporal Factors in Figural Aftereffects

1968 ◽  
Vol 27 (1) ◽  
pp. 287-291 ◽  
Author(s):  
June Adam ◽  
Marion Ring
Keyword(s):  
Exposure Time ◽  
Interstimulus Interval ◽  
Luminance Contrast ◽  
Test Figure ◽  
Time Condition ◽  
Temporal Factors ◽  
Concentric Circles

An experiment was designed to investigate the possibility of interactions between luminance contrast factors and temporal factors in determining the magnitude of the concentric-circles aftereffect. 24 combinations of inducing figure exposure time, condition of test figure presentation (determined by test figure exposure time and interstimulus interval), inducing figure luminance contrast and test-figure luminance contrast, were used. No interactions were found.

scholarly journals Psychophysical Measurements of Luminance Contrast Sensitivity and Color Discrimination with Transparent and Blue-Light Filter Intraocular Lenses

2017 ◽  
Vol 6 (2) ◽  
pp. 301-312 ◽  
Author(s):  
Marcelo Fernandes da Costa ◽  
Augusto Paranhos Júnior ◽  
Claudio Luiz Lottenberg ◽  
Leonardo Cunha Castro ◽  
Dora Fix Ventura
Keyword(s):  
Contrast Sensitivity ◽  
Blue Light ◽  
Color Discrimination ◽  
Luminance Contrast ◽  
Light Filter ◽  
Intraocular Lenses ◽  
Blue Light Filter
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