Nonlinear RGB video signal processing

Details Nonlinear RGB video signal processing Nonlinear RGB video signal processing

1990-09-19

1992-01-21

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358164, 358169, 358 27, H04N 5202, H04N 557, H04N 969

Patent

active

050831984

ABSTRACT:
A nonlinear video signal processing system provides gamma correction to improve rendition of picture details near black. In addition, picture brilliance is improved using a brightness and frequency dependent enhancement circuit providing increased detail signal contrast in bright picture areas. In each color channel, the respective color signal is gradually separated into a low level amplitude signal portion and a higher level amplitude signal portion. The higher level amplitude portion is high-pass frequency filtered. The low level signal portion and the high-pass filtered higher amplitude signal portion are added to the original, linear video signal for producing a combined signal coupled to the kinescope. The low level signal portion is DC coupled to the linear signal and the high level signal portion is AC coupled to the linear signal.

REFERENCES:
patent: 4038685 (1977-07-01), Bazin
patent: 4057828 (1977-11-01), Monahan
patent: 4262304 (1981-04-01), Faroudja
patent: 4812905 (1989-03-01), Rossi

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