Method of a circuit arrangement for producing a gamma corrected

Details Method of a circuit arrangement for producing a gamma corrected Method of a circuit arrangement for producing a gamma corrected

1983-06-15

1986-02-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, 358169, 328145, H04N 520

Patent

active

045689784

ABSTRACT:
A gamma correction factor is applied to a video signal without need of the normally used multiplier by forming the logarithm of the logarithm of the video signal and algebraically adding this signal to a second signal representing the logarithm of the correction factor. The anti-log of the anti-log of the resulting signal constitutes the gamma corrected signal. Analog and digital implementations of the circuitry are illustrated.

REFERENCES:
patent: 4394688 (1983-07-01), Iida et al.
patent: 4499494 (1985-02-01), Dischert et al.
SMPTE Journal, vol. 88, "A Digital Telecine Processing Channel", by Oliphant et al, pp. 470-480, (7-79).
IEEE Transactions on Broadcasting, vol. BC-22, No. 4, "On the Use of a Television System in Image Reproduction: Part 1-The Image Processing System", by Lappalainen et al, pp. 109-112, (12-76).

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