Image processing system

Details Image processing system Image processing system

1989-06-28

1991-02-26

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358466, H04N 140

Patent

active

049966030

ABSTRACT:
An image processing system for obtaining a binary signal from a multi-level signal read by an image scanner from an original document including mixed characters, ruled lines, and photos, and then obtaining a reproduced image from the binary signal, the image processing system including: a fixed slice processing unit for receiving said multi-level signal, and for slicing the multi-level signal by a predetermined fixed threshold level, and outputting the binary signal sliced by the fixed threshold level; a half-tone processing unit for receiving the multi-level signal, and for slicing the multi-level signal by a plurality of threshold levels defined by a dither method, and outputting the binary signal sliced by the plural threshold levels defined by the dither method; a character/photo separating unit for receiving the multi-level signal; and for detecting a pattern of the multi-level signal, separating either a character portion or photo portion based on the pattern, and outputting a selection signal; a selection unit for selecting either the fixed slice processing unit or the half-tone processing unit based on the selection signal from the character/photo separating unit.

REFERENCES:
patent: 4707745 (1987-11-01), Sakano

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