Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-12-08
1989-01-10
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 41, H04N 973
Patent
active
047977337
ABSTRACT:
A white balance adjusting device for a color video camera detects a color temperature detection signal R-B and a color information signal R+B-2Y from a video signal provided by the color video camera. A control signal generating means of the white balance adjusting device generates a control signal to drive a gate circuit when the level of the color information signal R+B-2Y is within a predetermined range of level. When the level of the color information signal is within the predetermined range of level, the gate circuit passes the color temperature detection signal R-B to apply the color detection signal R-B to a clipping circuit. The clipping circuit clips the amplitude of the color temperature detection signal R-B within a predetermined range of level. Chrominance signal gain control circuit for controlling the gains of chrominance signals R and B is controlled by the output of the clipping circuit for white balance adjustment.
REFERENCES:
patent: 4219841 (1980-08-01), Nishimura et al.
patent: 4506290 (1985-03-01), Hashimoto
Murakami Toshio
Takagi Yasushi
Britton Howard W.
Hitachi , Ltd.
Kostak Victor R.
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