Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1991-02-12
1993-01-26
Kostak, Victor R.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358909, 358 29, H04N 904
Patent
active
051826364
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.
REFERENCES:
patent: 4219841 (1980-08-01), Nishimura
patent: 4727413 (1988-02-01), Miura
patent: 4797733 (1989-01-01), Takagi
patent: 4883360 (1989-11-01), Kawada
patent: 4998162 (1991-03-01), Kondo
Hirota Katsuaki
Kato Funiaki
Kikuchi Akihiro
Kohashi Takashi
Kondo Toshiharu
Frommer William S.
Hsia Sherrie
Kostak Victor R.
Sinderbrand Alvin
Sony Corporation
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