Gamma correction method and system

Details Gamma correction method and system Gamma correction method and system

2005-12-07

2008-10-21

Ye, Lin (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S255000, C348S256000

Reexamination Certificate

active

07440015

ABSTRACT:
A gamma correction method and system, which performs a gamma correction on an n-bit video signal to thus generate a gamma correction value. At first, a first primary index and a first sub-index are obtained by performing an index mapping on a value of the video signal. Next, a first gamma value is obtained by performing a table lookup on the first primary index and the first sub-index. Next, a second primary index and a second sub-index are obtained by performing the index mapping on the first gamma value. Next, multiple thresholds are obtained by performing the table lookup on the second primary index and the second sub-index. Finally, the value of the video signal and the multiple thresholds are compared to accordingly correct the first gamma value and generate the gamma correction value.

REFERENCES:
patent: 5408267 (1995-04-01), Main
patent: 5473372 (1995-12-01), Nobuoka et al.
patent: 6166781 (2000-12-01), Kwak et al.
patent: 6697127 (2004-02-01), Suzuki
patent: 6791576 (2004-09-01), Lin

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