Tonal conversion method for pictures

Details Tonal conversion method for pictures Tonal conversion method for pictures

1990-02-16

1994-05-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358455, 358298, H04N 140

Patent

active

053133102

ABSTRACT:
Disclosed herein is a tonal conversion method of a picture useful upon producing a reproduced picture such as hard or soft reproduced picture from an original picture recorded or otherwise stored on a recording medium. Tonal conversion is conducted in such a way that the pictorial information value (X.sub.n) of a picture element on a camera subject; i.e., real picture corresponding to a desired picture element on the original picture, i.e., medium picture is obtained from a density information value (D.sub.n) relating to the density information of the desired picture or the original picture or the medium picture, and converting the thus-obtained pictorial information value (X.sub.n) into a tone intensity value (y) by using a specific tonal conversion formula.

REFERENCES:
patent: 4811108 (1989-03-01), Numakura et al.
patent: 4833546 (1989-05-01), Numakura et al.
patent: 4924323 (1990-05-01), Numakura et al.
patent: 4956718 (1990-09-01), Numakura et al.
patent: 5057931 (1991-10-01), Numakura et al.
patent: 5072305 (1991-12-01), Numakura et al.
patent: 5134494 (1992-07-01), Numakura et al.

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