AUTOMATIC WHITE BALANCE ADJUSTING APPARATUS FOR WHITE BALANCE ADJUSTING ON THE BASIS OF COLOR INFORMATION ABTAINED FROM CCD

摘要

On the scratch screen of the video camera, 64 areas are set, and the color difference signals RY, BY, and the luminance signal Y obtained from the image pickup signal are averaged by one field period for each area, so that each evaluation value r _ij, b _ij, y _ij is obtained. Based on these evaluation values, if it is determined that the difference between the evaluation values between the two successive areas does not exceed a predetermined value, that is, it is determined that the successive areas have the same color, it is necessary to prepare a gain control signal for the color difference signal. In this case, the weight to the color evaluation value of the region is reduced. As a result, the influence on the back balance adjustment of the same color subject is reduced.