Nonuniformity correction system for color CRT display

Details Nonuniformity correction system for color CRT display Nonuniformity correction system for color CRT display

1984-11-13

1986-12-23

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 358163, 358242, H04N 920, H04N 916, H04N 5243, H04N 568

Patent

active

046315764

ABSTRACT:
A system for the correction of nonuniformities in both color and brightness as provided for the correction of such nonuniformities in a color CRT display. The system employs correction signals which are obtained by photographing a white screen of the display at maximum brilliance. These correction signals are then added to video signals during normal operation of the display for presenting image data provided by the video signals. In the absence of any video signal, the full value of the correction signals is applied to the display. For increased amounts of video signal which cut back varying amounts of the primary colors of red, green, and blue, the correction signals are reduced in magnitude so as to provide a smaller contribution at the input video terminals of the display. Thereby, correction can be obtained over a range of varying values of intensity.

REFERENCES:
patent: 4473844 (1984-09-01), Klein
patent: 4581655 (1986-04-01), Ide et al.

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