Gamma correction of digital video data by calculating linearly i

Details Gamma correction of digital video data by calculating linearly i Gamma correction of digital video data by calculating linearly i

1987-07-16

1988-11-22

Sheppard, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358169, H04N 5202

Patent

active

047869682

ABSTRACT:
An apparatus, including a lookup table memory, for gamma correcting a digital video signal based on the assumption that for small gamma, gamma correction is a linear function so that for a digital video input signal value x a gamma correction value d to be added to x can be calculated as a function of an opertor selected variable a according to the formulae:

REFERENCES:
patent: 4394688 (1983-07-01), Iida et al.
patent: 4396938 (1983-08-01), Dischert
patent: 4641267 (1987-02-01), Asai et al.
patent: 4670788 (1987-06-01), Ozaki
patent: 4688095 (1987-08-01), Beg et al.
patent: 4689691 (1987-08-01), Isogai et al.

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