Circuit for gamma correction of a digital video signal and havin

Details Circuit for gamma correction of a digital video signal and havin Circuit for gamma correction of a digital video signal and havin

1991-04-29

1993-09-07

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, H04N 5202

Patent

active

052434265

ABSTRACT:
A gamma correction circuit converts digital video data to address data, reads out slope and intercept data for segments of a polygonal line approximation of a desired gamma correction characteristic stored at the address, and uses the read out data to generate a gamma corrected output video signal. Another gamma correction circuit directly uses digital video data to address previously stored level correction data, then uses the level correction data and a coefficient K to generate a gamma corrected output video signal.

REFERENCES:
patent: 4187519 (1980-02-01), Vitols et al.
patent: 4805013 (1989-02-01), Dei et al.
patent: 5047861 (1991-09-01), Houchin et al.
Royal Television Society Journal, vol. 14, No. 11, Sep. 1973, London GB pp. 261-264; Baldwin: `The Digital Television Studio Centre` p. 261, Right Column, Line 1-p. 262, Right Column, Line 17; FIGS. 6-7.

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