Contrast correction arrangements

Details Contrast correction arrangements Contrast correction arrangements

1977-08-08

1979-05-01

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, H04N 9535

Patent

active

041527208

ABSTRACT:
A contrast correction arrangement for a color television system detects the signal representative of the greatest brightness in a viewed scene, and multiplies the difference between the detected signal and a predetermined peak amplitude thereof by a control signal to produce a further signal which is variable in both sign and magnitude in dependence upon the departure of the detected signal from peak amplitude. A further multiplier multiplies the further signal with a normally provided composite color coded signal thereby to produce a video correction signal of sign varying in dependence upon the sign of the said further signal which is, in turn, mixed with the composite color coded signal to produce a resultant video signal of compressed, normal or expanded contrast range.

REFERENCES:
patent: 3128334 (1964-04-01), Heuer
patent: 3544709 (1970-12-01), Eckenbrecht
patent: 3597540 (1971-08-01), MacIntyre, Jr.
patent: 3637921 (1972-01-01), Abel
patent: 3684825 (1972-08-01), Dischert et al.

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