Independent fleshtone contours

Details Independent fleshtone contours Independent fleshtone contours

1984-06-28

1985-03-19

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, 358 28, H04N 9535

Patent

active

045062935

ABSTRACT:
A circuit providing independent control of selected color areas, such as fleshtone areas, is shown. The circuit comprises a fleshtone detector and a fleshtone contour control circuit. The fleshtone detector comprises a negative absolute value circuit using PNP transistors. A delay line circuit can be used to expand the fleshtone contour level to areas beyond the fleshtone areas. A fleshtone detector can also be used to control other special effects, such as luminance.

REFERENCES:
patent: Re29570 (1978-03-01), Breimer
patent: 3729580 (1973-04-01), Schneider
patent: 3938181 (1976-02-01), Avins
patent: 4167021 (1979-09-01), Holmes
patent: 4227205 (1980-10-01), Gomi
patent: 4306247 (1981-12-01), Tomimoto
patent: 4316215 (1982-02-01), Yasumoto
patent: 4327374 (1982-04-01), Matsuda

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