Gamma correction circuit and method thereof
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United States of America Patent
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-
Dec 29, 1992
Grant Date -
N/A
app pub date -
Aug 7, 1990
filing date -
Aug 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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