Flesh tone correction circuit

Details Flesh tone correction circuit Flesh tone correction circuit

1985-02-25

1987-05-19

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 964

Patent

active

046672230

ABSTRACT:
From the digital color-difference signals (b-y, r-y), the digital flesh-tone correction circuit forms a signal corresponding to the tangent between the two color-difference signals by means of absolute-value stages, a comparator, an intermediate switch, and a divider. In a correction stage, this signal is changed into the address signal for a read-only memory which holds the sine and cosine values of a preset function within a presettable angle correction range. By suitably multiplying the sine and cosine values by the color-difference signals in a multiplier, the flesh-tone-corrected color-difference signals are produced.

REFERENCES:
patent: 3536827 (1970-10-01), Bell
patent: 4523221 (1985-06-01), Chin et al.
patent: 4528586 (1985-07-01), Lewis et al.
patent: 4554576 (1985-11-01), Kao
patent: 4558351 (1985-12-01), Fling et al.

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