Television – Image signal processing circuitry specific to television – Color balance or temperature
Patent
1990-11-13
1995-08-15
Chin, Tommy P.
Television
Image signal processing circuitry specific to television
Color balance or temperature
H04N 964
Patent
active
054424089
ABSTRACT:
Sixty-Four regions are established on an image sensed picture from a video camera, where evaluating value r.sub.ij, b.sub.ij, and y.sub.ij is 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 for each region. When the apparatus determines that the difference in the evaluating values between two adjacent regions do not exceed a predetermined value, that is, when that adjacent regions have the same color, the weighing amount of the color evaluating values of a corresponding region is adjusted to limit its effect upon the gain control signals used to adjust the gain of the color signal amplifiers. As a result, the effect of objects of the same color towards white balance adjustment is reduced.
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Haruki Toshinobu
Kikuchi Kenichi
Chin Tommy P.
Michaelson Peter L.
Sanyo Electric Co,. Ltd.
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