The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 1989
Filed:
Dec. 08, 1987
Yasushi Takagi, Yokohama, JP;
Toshio Murakami, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
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.