Digital image system and method for noise compensation
First Claim
1. In a digital imaging device having automatic gain control, a method for noise compensation in low-light conditions, the method comprising:
- receiving digital image information;
compressing the image information;
supplying the compressed image information;
monitoring an automatic gain control signal;
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.
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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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Citations
18 Claims
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1. In a digital imaging device having automatic gain control, a method for noise compensation in low-light conditions, the method comprising:
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receiving digital image information;
compressing the image information;
supplying the compressed image information;
monitoring an automatic gain control signal;
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a digital imaging device having noise compensation in low-light conditions, the device comprising:
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a light sensing device having an input to receive an image and an output to supply digital image information;
a gain control unit having an input to receive light exposure information, the gain control unit automatically supplying a gain control signal in response to the light exposure information;
a compensation unit having an input to monitor the gain control signal and an output to supply a compensation signal in response to high gain control signals; and
,a compression unit to accept digital image information from the light sensing device and supplying compressed image information at an output with a volume that is controlled in response to the compensation signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification