Patent ID: 7864222
Filing Date: 2011-01-04
Classification: H04N

Abstract:
1. An automatic white balance system comprising: a first multiplier which outputs a white-balance-adjusted image signal; a color separation and synchronization unit which has a line memory for generating a white-balance-adjusted YUV signal from the white-balance-adjusted image signal; a color judgment unit which judges whether or not a white balance adjustment is needed; a white balance adjustment gain computation unit which calculates a white balance adjustment gain on the basis of the result of the judgment at the color judgment unit and the white-balance-adjusted YUV signal; a reciprocal computation unit which outputs the reciprocal transformation value of the white balance adjustment gain; and a second multiplier which multiplies the white-balance-adjusted YUV signal by the reciprocal transformation value, wherein the second multiplier generates a white-balance-unadjusted YUV signal, and the color judgment unit makes a judgment on the basis of the white-balance-unadjusted YUV signal.