Device for adjusting white balance by peak detection and smoothi

Details Device for adjusting white balance by peak detection and smoothi Device for adjusting white balance by peak detection and smoothi

1990-04-17

1992-07-21

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 44, H04N 973

Patent

active

051327830

ABSTRACT:
An automatic white balance adjusting device for use in a video camera has a plurality of color sensors for sensing a plurality of color components of light coming from an object or thereabout, a plurality of logarithmic compression circuits for effecting logarithmic compression of the respective outputs of the plurality of color sensors, a subtracting circuit for obtaining a difference between outputs of the plurality of logarithmic compression circuits, a smoothing circuit for smoothing an output of the subtracting circuit, a peak detecting circuit for detecting a peak value of the output of the subtracting circuit, an adding circuit for adding, at a predetermined ratio, an output of the smoothing circuit and an output of the peak detecting circuit, and a gain control circuit for controlling gains of color signals output from an image sensor in accordance with an output of the adding circuit.

REFERENCES:
patent: 4470067 (1984-09-01), Mino
patent: 4635101 (1987-01-01), Nakayama
patent: 4667224 (1987-05-01), Fujisige
patent: 4901152 (1990-02-01), Hieda et al.
patent: 4931856 (1990-06-01), Hieda et al.
patent: 4942459 (1990-07-01), Hieda et al.
patent: 4947242 (1990-08-01), Hieda
patent: 5010394 (1991-04-01), Murao

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