User`s manual

RadiCS
Chapter 10 Information
89
English
Luminance Check
Lmax and Lmin specified in QS-RL include the ambient luminance and are the same as L
’
max and
L
’
min used in RadiCS. QS-RL specifies Lmin Delta 1.0 cd/m
2
, but RadiCS includes no equality sign.
Lamb stands for the ambient luminance and refers to the same value as “Ls” of DIN. The inequality
Lmax/Ls > 100 (or 40) in the standard has been transformed into Ls > Lmax/100 (or 40). In QS-RL,
the luminance is specified as |Delta Ls|
≤
0.3 Ls. Delta Lamb in RadiCS corresponds to the calculation
of |Delta Ls|/Ls in QS-RL, and is expressed as its percentage. Note that none of inequalities used in
RadiCS includes an equality sign.
L’max/L’min stands for a contrast ratio. The inequality of L’max/L’min in QS-RL has an equality sign
in it (L’max/L’min
≥
100, 40 or 250) but the inequality in RadiCS does not. (L’max/L’min > 100, 40
or 250). In QS-RL, the luminance is specified as |Delta Km|
≤
0.3 Km. Km corresponds to L’max/L’
min in RadiCS, and Delta (L’max/L’min) in RadiCS corresponds to the calculation of |Delta Km|/Km
in QS-RL, and is expressed as its percentage. Also note that none of inequalities used in RadiCS
includes an equality sign.
In QS-RL, L’max and L’min are determined by measuring the luminance at square regions filled
with white (grayscale: 255) and black (grayscale: 0) in the test pattern 2, respectively. In RadiCS, a
window with the size of 10 % of the whole display area is displayed at the center of the screen. The
luminance is then measured twice in that window by setting the grayscales to 0 and 255.
By doing so, the exact contrast ratio can be acquired.
Uniformity Check
The luminance uniformity is determined by firstly measuring the luminance of the center and a corner
of the screen. Then, calculate the difference of these two luminance values and evaluate a percentage
by dividing the difference by the luminance of the center. However, QS-RL does not specify particular
measuring points for the uniformity measurement. In QS-RL, the measuring points are indicated with
the test pattern 1 or the SMPTE pattern of the aspect ratio of 1:1, but the measuring points in these
patterns have a significant difference, and other patterns around the measuring points may affect the
measurement results.
RadiCS displays two windows (grayscale: 128) with the size of 10 % of the whole display area at the
center and a corner of the screen. It then measures the luminance at the center of both windows.
Since any monitors that support the RadiCS luminance check are LCD monitors, the criteria of 15 %
or 20 % should apply to the LCD monitors, not to CRT monitors.
The specification described as (Lcorner-Lcenter) /Lcenter x 100 < 15 % (or 20 %) means (Lcorner-
Lcenter) /Lcenter x 100 < ±15 % (or ±20 %). Note that this inequality does not include the equality
sign.
Sensors
DIN requires the use of a measuring device for the acceptance tests that provides a luminance meter
compliant with Class B or higher standard (DIN 5032-7) and does not block the ambient light. This
requirement is also effective for QS-RL. RadiCS only allows noncontact type measuring devices to
perform both the acceptance tests and the constancy tests. Since the EIZO sensors are contact type
measuring devices, they are not applicable. Perform these tests by using the LX-Plus, LX-Can, CD-
Lux, CD mon or LS-100 sensors.
Multiple Monitors
Category A Mammo includes a determination for multiple monitors. QS-RL includes an equality sign
but RadiCS does not.