Facsimile with local correction of TRC based on destination TRC

Details Facsimile with local correction of TRC based on destination TRC Facsimile with local correction of TRC based on destination TRC

1995-03-10

1996-07-02

Vu, Kim Yen

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358518, 358523, 358436, H04N 1407

Patent

active

055328490

ABSTRACT:
A multifunction device having at least a facsimile function, a scanner and an image processing circuit is provided. The image processing circuit includes a circuit for applying a TRC correction to gray values derived at the scanner, before a halftoning circuit quantizes the gray values for printing. The TRC correction circuit includes at least two stored TRC correction functions that can be applied by the TRC correction signals. In making a call to transmit a document via the facsimile function to a called station, the exchange of signals required for establishing the facsimile connection includes identification of a preferred TRC correction function preparatory to printing at the called station printer. In accordance with the identification of a preferred TRC correction function, the image processing circuit operates on image signals derived at the scanner, to provide TRC correction of the image signals preparatory to printing at the destination printer.

REFERENCES:
patent: 3597071 (1971-07-01), Jones
patent: 4623244 (1986-11-01), Andrews et al.
patent: 4768082 (1988-08-01), Hiratsuka et al.
patent: 4811239 (1989-07-01), Tsao
patent: 4947345 (1990-08-01), Paradise et al.
patent: 5021892 (1991-06-01), Kita et al.
patent: 5038218 (1991-08-01), Matsumoto
patent: 5172224 (1992-12-01), Collette et al.
patent: 5347374 (1994-09-01), Fuss et al.
H. Hou, Digital Document Processing, John Wiley and Sons, 1983, pp. 100-103.
Recommendation T.30 "Procedures for Document Facsimile Transmission in the General Switched Telephone Network", Melbourne 1988 (ITU).

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