Digital image system and method for noise compensation

Television – Camera – system and detail – Low light level

Reexamination Certificate

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C348S229100, C348S255000

Reexamination Certificate

active

07136095

ABSTRACT:
For a digital imaging device having automatic gain control, a system and method have been provided for noise compensation in low-light conditions. The method comprises: receiving digital image information; compressing the image information; supplying the compressed image information; monitoring an automatic gain control signal; comparing the monitored gain control signal to a predetermined threshold gain value; in response to monitoring a high gain control signal, selecting a low-light processing algorithm; and, in response to the low-light algorithm, controlling the volume of the supplied compressed image information. Selecting a low-light processing algorithm includes selecting an algorithm that limits decreases in the compression ratio by changing parameters in a compression algorithm. Alternately, the low-light processing algorithm, prior to compressing, filters noise from the received digital image information. Subsequent to filtering noise from the received digital information, an approximately constant compression ratio is maintained.

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patent: 2002/0044223 (2002-04-01), Miller et al.
patent: 2002/0080260 (2002-06-01), Ojima
patent: 2001313906 (2001-11-01), None
Written translation of JP2001-313906A.

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