White balance adjustment apparatus

Details White balance adjustment apparatus White balance adjustment apparatus

1994-12-06

1996-01-02

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348227, 348655, H04N 973

Patent

active

054813026

ABSTRACT:
A white balance adjustment apparatus for adjusting red, green and blue video signals of an aiming subject has amplifiers for amplifying the R, G, B video signals, respectively, a brightness detector for detecting the brightness of the subject, and a mode selector for selecting either an outdoor lighting mode or an indoor lighting mode in accordance with the brightness detected by the brightness detector. A white detector is provided for receiving the R, G, B video signals for each pixel and detecting a pixel with R, G, B video signals that falls in a narrow white range when the outdoor lighting mode is selected, and in a wide white range when the indoor lighting mode is selected. An integrator integrates the number of detected pixels in the white range. A white balance gain control controls the gain of the amplifiers based on the integrated result of the integrator.

REFERENCES:
patent: 5016094 (1991-05-01), Kaneko
patent: 5021874 (1991-06-01), Tsugita
patent: 5045928 (1991-09-01), Takaiwa
patent: 5264921 (1993-11-01), Jinnai
patent: 5361093 (1994-11-01), Yamamoto

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