Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1997-09-16
2000-06-20
Grant, Jerome
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 140
Patent
active
060784059
ABSTRACT:
The present invention is directed to an image processing device that can process a halftone dot image without producing moire therein. An image processing device according to the present invention comprises an image memory for storing multi-gradational image data, an area-deciding portion for deciding an area of pixels PIX (x, y) of a multi-gradational image stored in the memory and outputting decision signal SEL=0 when the pixel is a character-area pixel or SEL=1 when the pixel is a halftone area, a binarizing portion for character for binarizing a character image pixel PIX (x, y) of the multi-gradational image data stored in the memory and outputting a binarized image data L, a binarizing portion for photographic image for binarizing a halftone image pixel PIX (x, y) of the multi-gradational image data stored in the memory and outputting a binarized image data P, an output selecting portion for selectably outputting binarized image data B which is a binarized image output L from the character-image data from the binarizing portion for character when the output SEL of the area-deciding portion is 1 or a binary image output P from the binarizing portion for photographic image when the output SEL is 0, and a memory for storing binarized image data outputted from the output selecting portion.
REFERENCES:
patent: 4668995 (1987-05-01), Chen et al.
patent: 5486927 (1996-01-01), Koizumi
patent: 5687252 (1997-11-01), Kanno et al.
patent: 5787195 (1998-07-01), Tsujimoto
patent: 5798846 (1998-08-01), Tretter
Takeda Yuuki
Yamada Hideaki
Conlin David G.
Grant Jerome
Sharp Kabushiki Kaisha
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