Gamma correction circuit and method thereof

Details Gamma correction circuit and method thereof Gamma correction circuit and method thereof

1990-08-07

1992-12-29

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, H04N 5202

Patent

active

051756218

ABSTRACT:
Non-linear outputs x.sup.A and x.sup.B for input signals x are calculated by referring to look-up tables, in which pairs of input and output signals with respect to gamma coefficients A and B different from each other are stored. These outputs x.sup.A and x.sup.B are multiplied by coefficients (1-k) and k, respectively, and the products are added to each other. Gamma correction outputs are approximately outputted from the result x.sup.A .times.(1-k)+x.sup.B .times.k. Any desired gamma characteristics can be obtained by varying the value of k in the range of 0 to 1. It is sufficient that the gamma characteristics data stored in the look-up tables (in advance) are only two kinds of data. A variety of gamma characteristics can be provided without increasing the memory capacities of the look-up tables.

REFERENCES:
patent: 3970774 (1976-07-01), Bazin et al.
patent: 4038685 (1977-07-01), Bazin
patent: 4200888 (1980-04-01), Blom

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