Digital copier with document image region decision device

Details Digital copier with document image region decision device Digital copier with document image region decision device

1985-12-20

1987-11-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, 382 50, H04N 140

Patent

active

047077450

ABSTRACT:
A digital copier for reproducing images carried in a document by converting them to an electrical binary or recording
on-recording signal and recording the binary signal. The copier includes a halftone image processor unit for generating a binary signal associated with a halftone image included in the scanned document images, and a binarizer unit for generating a binary signal associated with a two-level image included in the document images. The copier also includes an image region decision unit for determining to which one of a halftone image region and a two-level image region a pixel of a document image which is to be read belongs. The decision is made using binary data which is produced by processing the scanned image data with respect to a threshold level different from a threshold level adapted for simple binarization. Edges of the decided halftone image are processed in an optimum manner.

REFERENCES:
patent: 4447830 (1984-05-01), Stoffel
patent: 4547811 (1985-10-01), Ochi et al.
patent: 4577235 (1986-03-01), Kannapell et al.

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