Tonal conversion method for pictures

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358298, H04N 140

Patent

active

049243233

ABSTRACT:
Upon production of a reproduced picture from an original picture having a standard or non-standard, tonal conversion of the original picture is conducted based on pictorial information from the original picture. The information is processed in such a way that the base density information datum of a desired control point on the original picture and the halftone intensity at a corresponding control point on the reproduced picture are correlated in accordance with a specific conversion formula.

REFERENCES:
patent: 4680646 (1984-08-01), Ikede et al.
patent: 4701807 (1987-10-01), Ogimo
patent: 4717964 (1988-01-01), Abe et al.
patent: 4736253 (1988-04-01), Shida
patent: 4811108 (1989-03-01), Numakura et al.
J. A. C. Yule "Principles of Color Reproduction", pp. 110-111, John Wiley & Sons (1967).

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