In the dark region, [alpha] = 0, indicating that the perceived contrast doesn't depend on the background luminance
and is a function only of the absolute luminance difference [DELTA]B.
Stimuli are presented upon a liquid crystal display screen, at a mesopic background luminance
8226; RVR Measurement System based on forward-scatter meters equipped with background luminance
(ambient light) sensor.
The notion that, in older adults, contrast sensitivity impairment increases with decreasing background luminance
and that the determinants of this phenomenon are partially neural is not new in the literature (10,26).
Before visual testing the subjects were given 30 minutes to adapt to the background luminance
in both installations of lighting with HPS and LEDs.
As it was already mentioned that the size, background luminance
, and luminance contrast of the visual target determines its visibility, the age of the observer should be pointed out as well.
W] is ratio of task and background luminance
difference and background luminance
The latter is the estimated sensitivity of the pilot's eyes as derived from the measured background luminance
In general the effect of glare will increase when the source luminance increases, the background luminance
decreases, and the angle between the line of sight and the direction of the light source decreases (see, e.
It had to have very carefully controlled lighting levels, partly because many of the screens and optical devices need low background luminance
The EL display offers excellent contrast and negligible background luminance
, which has been found to result in faster recognition and response time.
Mean, standard deviation and median of background luminance
in different density of light patterns BGD Level Mean Pixel Std Dev Brightness Scene 1 High 54.