Circuit for preventing automatic white balance error operation

Details Circuit for preventing automatic white balance error operation Circuit for preventing automatic white balance error operation

1992-10-20

1994-09-13

Groody, James J.

Television

Image signal processing circuitry specific to television

Color balance or temperature

348363, H04N 973, H04N 904

Patent

active

053473205

ABSTRACT:
An error operation in a white balance circuit is prevented from occurring. This error operation occurs when a white balance control is mistakenly executed upon recognizing that a color temperature of the environment is changed during a counter light correction either when an iris is adjusted or when an amplifying gain in an amplifying stage is controlled. The counter light correcting function is executed in order to account for the fact that an object appears shaded in the vicinity of a bright background. The error operation is prevented by maintaining the white balance correction at a present state when a voltage from a counter light correction circuit becomes greater than a reference voltage.

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