White balance adjusting system including a color temperature var

Details White balance adjusting system including a color temperature var White balance adjusting system including a color temperature var

1991-01-17

1992-12-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 41, 358 44, H04N 973

Patent

active

051702479

ABSTRACT:
Operational amplifiers detect deviations from white in pictures picked up based on color-difference signals and generate white balance control signals, respectively. The data that correspond to the generated white balance control signals are held at counters. The data that should be held at the counters are updated successively according to a synchronization signal which is applied successively to the counters. Gains of variable gain amplifiers (3r, 3b) that amplify red and blue color signals are controlled, respectively, based on the data held at the counters. A color temperature detection circuit detects a difference between a level of white balance control signal and a level expressed by the data held at the counter and generates a color temperature variation detection signal when the difference exceeding a predetermined level exists. In the event the color temperature variation detection signal is generated, a synchronization signal whose cycle is shorter than a cycle of synchronization signal that has been applied until that time is applied to the counters for a predetermined amount of time to accelerate the speed of updating data that should be held at the counters.

REFERENCES:
patent: 4562459 (1985-12-01), Sokei
patent: 4727413 (1988-02-01), Miura et al.
patent: 4797733 (1989-01-01), Takagi et al.
patent: 4883360 (1989-11-01), Kawada et al.
patent: 4931856 (1990-06-01), Hieda et al.
patent: 4987482 (1991-01-01), Imai et al.

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