Method of and circuit arrangement for contrast correction in whi

Details Method of and circuit arrangement for contrast correction in whi Method of and circuit arrangement for contrast correction in whi

1993-01-26

1994-09-06

Groody, James J.

Television

Image signal processing circuitry specific to television

Gray scale transformation

H04N 557, H04N 964

Patent

active

053452771

ABSTRACT:
A method of and circuit arrangement for contrast correction of color television signals is proposed, which is used for black stretching. A luminance signal (Y) is formed by matrixing from the (gamma-corrected) chrominance signals (R, G, B), while a correction signal is derived from the luminance signal, which correction signal is largest in the proximity of the black level and becomes zero in the blanking interval and in the proximity of the white level. This correction signal is added to each chrominance signal.

REFERENCES:
patent: 4241362 (1980-12-01), Van der Valk
patent: 4489349 (1984-12-01), Okada
patent: 4755726 (1988-07-01), Baker
patent: 4800433 (1989-01-01), Kamemoto
patent: 4847524 (1989-07-01), Van Rooy et al.
patent: 5134465 (1992-07-01), Ohki

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