Method for adaptively screening a continuous tone original...

Details Method for adaptively screening a continuous tone original... Method for adaptively screening a continuous tone original...

2006-06-26

2011-10-04

Lee, Thomas D (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003030

Reexamination Certificate

active

08031373

ABSTRACT:
A method of converting two-dimension signal including multilevel tone values of areas of the original into two-dimension halftone print copy signal including two-level tone values of printed and blank elements thereof includes, forming two types of two-dimension weight values. In the first, these values are distributed among print copy elements in an order independent of the tone variation along areas of the original. In the second, the geometry of contours and fine details thereof are taken into account. The two-level halftone copy signal is formed by comparing signal values of areas of the original and weight values of the first and second types. The second type values are placed inside the space intervals-segments, whose position is determined by forming the counter trace signal, and the boundaries of segments are set according to the number of neighboring elements for reproducing the counter or fine detail on the halftone copy.

REFERENCES:
patent: 5229867 (1993-07-01), Ershov et al.
patent: 7199905 (2007-04-01), Sharma
patent: 2008/0170267 (2008-07-01), Li et al.
patent: 1 407 487 (1975-09-01), None
patent: 56-055257 (1981-05-01), None
patent: 2 126 598 (1999-02-01), None

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