White balance adjustment device for automatic adjustment of white balance depending on the colour information signal from an imaging device

摘要

64 regions are set on an image sensed picture of a video camera, where evaluating values rij, bij and yij are obtained by averaging color difference signals R-Y and B-Y and luminance signal Y obtained from an image sensing signal for over 1 field period by each region. When determination is made that the difference in the evaluating values between two continuing regions do not exceed a predetermined value according to the obtained evaluating values, that is, when determination is made that continuing regions have the same color, the weighing amount of the color evaluating values of a corresponding region is reduced in producing gain control signals regarding the color difference signals. As a result, the effect of objects of the same color towards white balance adjustment is reduced.