Fixed pattern noise subtraction in a digital image sensor

Details Fixed pattern noise subtraction in a digital image sensor Fixed pattern noise subtraction in a digital image sensor

2007-10-09

2007-10-09

Ometz, David (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S241000

Reexamination Certificate

active

10670014

ABSTRACT:
A fixed pattern noise subtraction method in a digital imaging system incorporating a digital image sensor includes: acquiring a reference image of the digital image sensor when the digital image sensor receives no illumination, storing a reference value of an operating parameter associated with the reference image where the reference image is indicative of the fixed pattern noise associated with the digital image sensor, storing a model describing the behavior of the fixed pattern noise as a function of the operating parameter. Then, the method continues with acquiring a first image, measuring a current value of the operating parameter associated with the first image, calculating a noise prediction image by extrapolation of the reference image in accordance with the model and based on the current value and the reference value of the operating parameter, and subtracting the noise prediction image from the first image to generate a final image.

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patent: 7173656 (2007-02-01), Dunton et al.
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