Device for correcting color information supplied by a television

Details Device for correcting color information supplied by a television Device for correcting color information supplied by a television

1982-05-19

1985-02-12

Smith, Jerry

Facsimile and static presentation processing

Static presentation processing

Attribute control

364553, 364554, 358166, H04N 514

Patent

active

044994869

ABSTRACT:
The correction consists in correcting the overall luminance, while retaining the original chromaticity of the analyzed picture. For this purpose, the device according to the invention comprises a correcting circuit receiving the color signals V.sub.e1, V.sub.e2 and V.sub.e3 and supplying corrected color signals, a matrixing circuit supplying the overall luminance signal V.sub.e, and a control circuit calculating eight transfer parameters defining the transfer function F, which transforms the signal V.sub.e into a signal F(V.sub.e) covering the scale of luminances in accordance with an equal distribution in order to satisfy the optimum vision conditions. The control circuit processes the signal (F(V.sub.e)/V.sub.e) and the correcting circuit supplies corrected color signals respectively corresponding to the products V.sub.e1 .multidot.(F(V.sub.e)/V.sub.e), V.sub.e2 .multidot.(F(V.sub.e)/V.sub.e) and V.sub.e3 .multidot.(F(V.sub.e)/V.sub.e).

REFERENCES:
patent: 3681520 (1972-08-01), Schneider
patent: 3684825 (1972-08-01), Dischert et al.
patent: 3979555 (1976-09-01), Opittek et al.
patent: 3983320 (1976-09-01), Ketcham et al.
patent: 4315319 (1982-02-01), White
patent: 4337514 (1982-06-01), Favreau et al.
patent: 4353092 (1982-10-01), Bailey et al.
patent: 4365304 (1982-12-01), Ruhman et al.
patent: 4394744 (1983-07-01), Wrench, Jr.

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