White balance control using a vertical edge detection signal in

Details White balance control using a vertical edge detection signal in White balance control using a vertical edge detection signal in

1996-11-12

1999-09-14

Ho, Tuan V.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348252, H04N 973

Patent

active

059530588

ABSTRACT:
A video camera capable of controlling white balance according to the color temperature of an object comprises an image pickup device, an edge detecting means for detecting a vertical edge in a signal provided by the image pickup device, a primary color generating means for generating three primary color signals from the signal provided by the image pickup device, and a color temperature calculating means for calculating the color temperature of the object from three primary color signals provided by the primary color generating circuit. The color temperature calculating means reduces the effect of the three primary color signals given thereto by the primary color generating means on calculation when the level of a vertical edge signal is high. A white balance control method of controlling white balance according to a color temperature, comprises a first step of detecting a vertical edge in a signal thereto, a second step of generating three primary color signals from the signal, and a third step of calculating a color temperature from the three primary color signals so that the three primary color signals may not significantly affect calculation when the level of the vertical edge signal is high.

REFERENCES:
patent: 5420630 (1995-05-01), Takei
patent: 5568195 (1996-10-01), Suzuki

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