Method of correcting phosphor luminance unevenness in a color fi

Details Method of correcting phosphor luminance unevenness in a color fi Method of correcting phosphor luminance unevenness in a color fi

1984-12-06

1987-06-02

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358163, 358296, 358302, 346110R, 346161, H04N 146, H04N 1036, G01D 942, G01D 1506

Patent

active

046707786

ABSTRACT:
Unevenness of luminance of a plurality of phosphors on a screen provided in the front end of an electron gun type fiber optic cathode-ray tube is corrected by first measuring luminance distributions at positions of picture elements of a picture to be scanned on the respective phosphors and calculating correction amounts needed to even up the measured luminance distributions. The calculated results are then stored in a table. The correction amount corresponding to a recording position is then added to the luminance signal when the picture is recorded and the sum is multiplied by a correction ratio which varies according to the level of the sum of the correction amount and the luminance signal.

REFERENCES:
patent: 3210597 (1965-10-01), Siegmund et al.
patent: 3811007 (1974-05-01), Unger et al.
patent: 4309720 (1982-01-01), Denham
patent: 4459512 (1984-07-01), Ohhata

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