Gamma correction method, gamma correction apparatus, and...

Details Gamma correction method, gamma correction apparatus, and... Gamma correction method, gamma correction apparatus, and...

2007-09-18

2007-09-18

Ahmed, Samir (Department: 2624)

Facsimile and static presentation processing

Natural color facsimile

Color correction

C358S523000, C358S525000, C358S518000, C358S001900, C382S274000, C382S167000

Reexamination Certificate

active

10671987

ABSTRACT:
First, image data is converted using a first table storing conversion values in addresses corresponding to at least input values: u(k) represented by u(k)=ab−k(where a and b are constants and k is 0, 1, 2, . . . m) of all input values and linear interpolation. Next, a second table storing conversion values set in response to the image data provided by conversion using the first table in addresses corresponding to at least input values: v(k) represented by v(k)=ck+d (where c and d constants and k is 0, 1, 2, . . . n) of all input values is stored in memory. Next, the image data provided by conversion using the first table is again converted using the second table and linear interpolation.

REFERENCES:
patent: 4853795 (1989-08-01), Morton et al.
patent: 5926560 (1999-07-01), Ichinose et al.
patent: 5937088 (1999-08-01), Hsu
patent: 6064396 (2000-05-01), Ouchi et al.
patent: 6700561 (2004-03-01), Christensen et al.

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