Method for coding facsimiles

Details Method for coding facsimiles Method for coding facsimiles

1988-01-25

1988-11-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 140

Patent

active

047869755

ABSTRACT:
A method for coding facsimiles which are acquired when scanning originals containing halftone areas. In order to eliminate moire and/or for the purpose of a data compression, a coding of the halftone areas corresponding to an unsharper imaging in comparison to the original is executed such that the so-called halftone raster is suppressed. The method provides that a detail area is defined with a respective halftone area and is coded with a "detail code". At least a remaining area of the halftone area is coded with an "unsharp code". The method offers the advantage of the possibility of an improved detail reproduction given simultaneous suppression of a moire and given a good data compression.

REFERENCES:
patent: 4122496 (1978-10-01), Childress et al.
patent: 4194221 (1980-03-01), Stoffel
patent: 4447830 (1984-05-01), Stoffel
patent: 4547812 (1985-10-01), Waller
CCITT, "Specifications of Signalling System No. 7", 11-10-80.
CCITT, "Draft Reccommendation", Group 4, Fascimile Apparatus, 5-24-83.
1984 Intl. Zurich Seminar on Digital Communications, "Applications of Source Coding Channel Coding and Secrecy Coding", 3-6-84.
Postl; Wolfgang, "Halftone Recognition by an Experimental Text and Facsimile Workstation", IEEE, 1982, Jun. 16.

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