Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-08-02
1986-02-04
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
324404, H04N 1704
Patent
active
045689750
ABSTRACT:
A method and apparatus for measuring the Gray Scale characteristics of a CRT display wherein a luminance meter surveys a ten percent portion of the total surface area of the screen of the CRT display screen. The luminance meter is positioned far enough from the screen so that the cone surveyed by the luminance meter will intersect the plane of the screen to cause ten percent of the screen surface area to be surveyed. A special test pattern is generated for display on the CRT screen whereby a surveyed area is provided having a sufficiently large surface area and being of uniform brightness. The test pattern also provides for an additional screen area equal in size to the surveyed area. The average picture level for the surveyed area and the non-surveyed area is maintained at fifty percent of peak picture level while the brightness of the surveyed area is varied in incremental steps through the Gray Scale. The test pattern also provides for another portion of the screen having three contiguous areas having brightness levels of whiter than black, black, and blacker than black, respectively. An additional area of the test pattern is provided which together with the black areas provide for a fifty percent average picture level. The APL for the entire screen is maintained at fifty percent. As the surveyed area brightness level is varied through the Gray Scale, the luminance meter measures the brightness whereby the Gray Scale performance of the CRT display can be measured. The black areas of the screen are monitored visually to ensure that the black level setting for the CRT display is proper throughout the test.
REFERENCES:
patent: 4093960 (1978-06-01), Estes
patent: 4536792 (1985-08-01), Harshbarger
Television Test Patterns From High Technology Television Visual Information Institute, Inc. 1982.
Britton Howard W.
Jeffers Albert L.
Niewyk Anthony
Visual Information Institute, Inc.
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