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. 26, 1993
Filed:
Feb. 12, 1991
Akihiro Kikuchi, Chiba, JP;
Toshiharu Kondo, Kanagawa, JP;
Takashi Kohashi, Chiba, JP;
Funiaki Kato, Chiba, JP;
Katsuaki Hirota, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a color video camera providing color video signal components corresponding to a light image projected on an image pickup, only the levels of the color video signals components which correspond to at least substantially white regions of the light image are detected, and such detected levels of the color video signal components are integrated so as to obtain average values thereof as white-balance detection signals. The color video signal components which correspond to at least substantially white regions of the light image, and thus have their levels detected, may be those which occur during intervals corresponding to a white-balance detecting area positioned to correspond with a selected white area of the light image. Alternatively, the color video signal components may be sampled to provide pixel-by-pixel values thereof, whereupon, only those pixel-by-pixel values which are determined to be within a predetermined range of white as defined by a black body radiation curve are subjected to integration. The predetermined range is made relatively wide when the valve of the color video signal components deviate substantially from a desired white-balance relationship and the range is reduced as the values of the conponents come near to the desired relationship.