White balance control circuit for video camera with specified ra

Details White balance control circuit for video camera with specified ra White balance control circuit for video camera with specified ra

1991-10-28

1993-11-16

Powell, Mark R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 973

Patent

active

052628485

ABSTRACT:
In a color processing circuit for a video camera, there is provided a white balance control circuit for supplying a plurality of white balance control voltages to the color processing circuit, the white balance control circuit comprising a control voltage dividing section for dividing first and second white balance voltages from a white balance control section to generate first through fourth white balance control voltages to the color processing circuit. The control voltage dividing section comprises a first inverting amplifier, a second inverting amplifier operable to vary a color temperature estimating range and an intermediate value of the color temperature estimating range, for outputting the second white balance control voltage, a first voltage divider for outputting the third white balance control voltage, a third inverting amplifier operable to vary the color temperature estimating range and the intermediate value of the color temperature estimating range, for outputting the first white balance control voltage, and a second voltage divider outputting the fourth white balance control voltage, whereby the control voltage dividing section is capable of adjusting a color temperature estimating range.

REFERENCES:
patent: 4922330 (1990-05-01), Saito et al.
patent: 5119178 (1992-06-01), Sakata et al.

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