System for converting color image signals having high-frequency

Details System for converting color image signals having high-frequency System for converting color image signals having high-frequency

1996-10-15

1999-05-04

Coles, Edward L.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358518, 358515, 358500, 358529, 348708, 348617, 348712, 386 2, G03F 308, H04N 964, H04N 977, H04N 521

Patent

active

059009527

ABSTRACT:
A system for converting original RGB color signals to CMY signals includes the step of separating color signals from the original image into low-frequency and high-frequency components. The low-frequency components are converted to CMY signals via a look-up table reflective of a non-linear algorithm, while the high-frequency components are converted to CMY signals according to linear algorithms. The technique avoids color distortion caused by high-frequency noise, such as from halftone screens, in the original image.

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patent: 5077604 (1991-12-01), Kivolowitz et al.
patent: 5087126 (1992-02-01), Pochieh
patent: 5293228 (1994-03-01), Marti
patent: 5528386 (1996-06-01), Rolleston et al.
patent: 5555031 (1996-09-01), Van Rooj
patent: 5572632 (1996-11-01), Laumeyer et al.

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