H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/42
H04N 9/73 (2006.01)
Patent
CA 1139427
SO 1316 METHOD AND APPARATUS FOR ADJUSTING WHITE BALANCE ABSTRACT OF THE DISCLOSURE A white balance circuit for adjusting white balance in a composite color signal, having a luminance component and color difference signals, produced from a color television camera utilizes a microcomputer having a random-access-memory (RAM) to control the white balance digitally. A reference video signal is sampled during a blanking interval, then is stored as a digital quantity in a first location in the RAM. Then one color difference signal (R-Y) is sampled during a scanning interval, and is stored as a digital quantity in a second location in the RAM. Then the quantity stored in the second location is modified so that its value is substantially the same as that of the quantity stored in the first location. A correction signal varies with the luminance component and is proportional to the value of the quantity stored in the second location, and this correction signal is combined with the color difference signal to effect coarse adjustment of white balance. Fine adjustment is achieved by performing a predetermined number N of iterations of converting the quantity stored in the second location to an analog level, comparing such level with the level of the color difference signal, changing the quantity in the second location by one bit in the sense to minimize the difference between the two levels, and adjusting the correction signal in accordance with the changed quantity in the second location of the RAM. -1-
355158
Gowling Lafleur Henderson Llp
Sony Corporation
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