Dome CXtra Guide de l'utilisateur télécharger pdf (Page 78)

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To inspect display screen quality

When the SMPTE pattern appears on the display screen, examine

the image carefully for the following features:

• Verify that the 0%-5% contrast is visible.

• Verify that the 95%-100% contrast is visible.

• Verify that each gray level step from 0% to 100% can be

distinguished from the adjacent squares. Verify that you can,

for example, distinguish the 0% square from the 10% square or

the 90% square from the 100% square.

• Verify that the alphanumeric characters that appear on the pattern

are sharp and in focus. For example, examine the “%” signs that

label the steps of the gray scale.

• Verify that the high contrast line-pair images at the center and

corners of the SMPTE pattern are distinguishable.

NOTE: The SMPTE pattern shown via the Dome CXtra software has

five sets of high-contrast and five sets of low-contrast line-pair

patterns. One set of each is in the center of the image, and one set

of each is in each corner of the image. The high-contrast patterns

have frequencies of 3- pixels-on/3-pixels-off, 2-pixels-on/2-pixels-off,

and 1-pixel-on/1-pixel-off. At each frequency, a set of line-pairs is

oriented in the horizontal direction and a set is oriented in the vertical

direction. Visibility of the low-contrast patterns is not evaluated in

this test.

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Dome CXtra Guide de l'utilisateur Page 78