Multipoint digital automatic white balance for a video system

Details Multipoint digital automatic white balance for a video system Multipoint digital automatic white balance for a video system

1992-02-19

1993-06-01

Peng, John K.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 54, 358214, H04N 911, H04N 964, H04N 336, H04N 5253

Patent

active

052164934

ABSTRACT:
A multipoint digital automatic white balance system is provided that automatically compensates for changes in illumination conditions. Three color channels are balanced by measuring the relative output of the red to green channels and the blue to green channels at many different illumination levels. Base line measurements obtained in the green channel are used to create calibrated green channel data that is stored in a green channel LUT, which in turn is used to create corresponding red and blue channel data that is stored in red and blue LUTs. In operation, digitized red, green and blue input signals are applied to the red, green and blue LUTs to generate white balance corrected red, green and blue output signals.

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