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For medium luminance levels, the visibility threshold is generally small.
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Luminance levels were chosen in the mesopic domain relevant for road lighting at night.
The evaluation of luminance spatial uniformity at two distinct luminance levels across the display faceplate using TG18-UNL test patterns should yield nonuniformity coefficients smaller than 30%.
However, the useful range of saturation decreases as we move away from medium luminance values.
* Screen type and size * Projector model * Aspect ratio * Throw ratio calculator * Geometry settings * Viewing angle map * Luminance levels.
A medium luminance filter which removes samples below 10% of the minimum luminance and above 90% of the maximum luminance improves the false-positive rate by 1.4% (compared to the baseline) and keeps the detection rate constant.
Reflection measurements include specular and diffuse reflection coefficients from which the maximum allowable ambient lighting is determined such that contrast degradation due to display reflection remains below a 20% limit and the level of ambient luminance (Lamb) does not unduly compromise luminance ratio (LR) and contrast at low luminance levels.
Luminance evaluation relies on visual assessment of low contrast features in the TG18-CT and TG18-MP test patterns, or quantitative measurements at 18 distinct luminance levels of the TG18-LN test patterns.
Flickering can be observed as significant and high-frequency alternated variation between different luminance levels [11].
Luminance levels can change dramatically over time and depending on the place.
Secondly, the display's mean luminance drifted slightly downwards during a measurement when high mean luminance levels were used.
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