White balance adjusting apparatus for automatically adjusting white balance on the basis of a color information signal obtained from an image- sensing device

摘要

Sixty four regions are established on an image-sensed picture from a video camera, wherein evaluating values r.sub.ij, b.sub.ij and y. sub.ij are obtained by averaging color difference signals R-Y, B-Y and a luminance signal Y obtained from a video signal, respectively, over one field period for each region. When producing a gain control signal for each color difference signal, fuzzy inference is made on the basis of these evaluating values and a weighting amount for each color evaluating value for each region is determined. As a result of the weighting, the contribution degree of each color difference signal in a region, not including a light source color temperature axis on a color plane, is reduced to achieve good white balance adjustment.