Patent ID: 7319483

Claim:
A digital automatic white balance device comprising: a timing controller for receiving a vertical synchronization signal and a horizontal synchronization signal of an input image inputted to the device, and producing a timing control signal; an RGB multiplier for multiplying input RGB image data inputted to the device by received RGB gains corresponding respectively to RGB channels; a first YCbCr averaging unit for converting input RGB image data inputted to the device to YCbCr image data, and then obtaining first YCbCr averages Y 1 avg, Cb 1 avg and Cr 1 avg of this YCbCr image data; a second YCbCr averaging unit for converting output RGB image data outputted from the RGB multiplier to YCbCr image data, and then obtaining second YCbCr averages Y 2 avg, Cb 2 avg and Cr 2 avg of this YCbCr image data; and an RGB gain controller for comparing the second YCbCr averages with predetermined target YCbCr averages, respectively, according to the timing control signal from the timing controller, and obtaining RGB gains, corresponding respectively to the channels, on the basis of the first YCbCr averages, according to the compared result, and then providing the obtained RGB gains to the RGB multiplier.