Compatible circuit for automatically controlling white balance a

Details Compatible circuit for automatically controlling white balance a Compatible circuit for automatically controlling white balance a

1990-12-31

1992-11-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, H04N 973

Patent

active

051648202

ABSTRACT:
An apparatus and a process for automatically balancing the white portion and the black portion of a video signal, is designed to have a simplified structure as well as to provide a degree of compatibility between the white portion and the black portion. A color signal processor for variably processing selected color signals of the video signals, a first comparator device responsive to the first selected color signals for providing an automatic white balance signal, a second comparator device responsive to the second selected color signals for providing an automatic black balance signal, and a controller responsive to the automatic white balance signal and the automatic black balance signal for balancing the whiteness level and the blackness level of the video signals in dependence upon reception of a user's command signal representative of either the balancing of the whiteness level or the balancing of the blackness level and a vertical synchronizing signal. The process contemplates a key check sequence, an automatic white balance control sequence, an automatic black balance control sequence, and an information output sequence.

REFERENCES:
patent: 3735026 (1973-05-01), Smith et al.
patent: 3786177 (1974-01-01), Bazin
patent: 4340903 (1982-07-01), Tamura
patent: 4805010 (1989-02-01), Shroyer et al.
patent: 4805011 (1989-02-01), Sase
patent: 4911552 (1990-03-01), Kurashige et al.

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