Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-05-28
1994-12-27
Brinich, Stephen
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
382 51, G06K 938
Patent
active
053770200
ABSTRACT:
A digital data representation of an original entered by optical scanning is provided by generating a data signal having grey-level values for points on a scanning line transversely to the original in the scanning. Then local threshold values of zones on the original are determined. These local threshold values are determined statistically in response to the frequency distribution of grey-level values belonging to points from line segments in the zone. The grey-level value frequency distribution of the zones is updated currently, segments from the line last scanned replacing the oldest line segments in the zones, whereby the frequency distribution is changed and updated threshold values are determined. The grey-level value of a point is compared with the updated threshold value of the zone concerned to determine a state of the point in the digital data representation, and the states of the individual points are stored to provide the digital data representation.
REFERENCES:
patent: 5179599 (1993-01-01), Formanek
Brinich Stephen
Contex A/S
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