Method and system for black-level correction on digital...

Details Method and system for black-level correction on digital... Method and system for black-level correction on digital...

2007-05-29

2010-06-08

Ho, Tuan (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S243000, C348S245000, C348S251000

Reexamination Certificate

active

07733391

ABSTRACT:
The black level in raw image data captured from an image sensor does not always stay fixed at a constant level, but may change as a function of the analog gain and exposure time and may vary from one spatial location of the pixels to another. To carry out black-level correction on the raw image data, the black level of each of the color components is measured at one or more sampling locations. A look-up table is generated based on the measured black levels and a computation module is used to carry out black-level correction based on the information stored in the look-up table. The look up table may have information indicative of the analog gain level and the exposure time and the variations of black-levels in different spatial locations.

REFERENCES:
patent: 5008739 (1991-04-01), D'Luna et al.
patent: 7088388 (2006-08-01), MacLean et al.
patent: 2005/0285952 (2005-12-01), Kwon et al.
patent: 2007/0273775 (2007-11-01), Jiang

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