Imgae processing apparatus

Details Imgae processing apparatus Imgae processing apparatus

1989-04-14

1989-10-31

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, H04N 1393

Patent

active

048781266

ABSTRACT:
There is an image processing apparatus such as a copying apparatus for processing an input image data. This apparatus comprises: an image scanner such as a CCD to digitally read out the image data from a document; a discriminating unit to discriminate whether the input image data is the halftone image data such as a photograph or single density image data such as characters or symbols; a magnification change unit to change the magnification of the image data; and a smoothing unit to smooth the image data in the case where the discriminating unit decides that the input image data is the halftone image data when the magnification change unit performs the magnification changing process. The discriminating unit executes the above discrimination on the basis of the density levels of or density difference between a target pixel and its peripheral pixels in the input image data. With this apparatus, the magnification of the halftone image can be smoothly changed.

REFERENCES:
patent: 4506301 (1985-03-01), Kingsley
patent: 4578712 (1986-03-01), Matsunawa
patent: 4679096 (1987-07-01), Nagashima
patent: 4680720 (1987-07-01), Yosh II
patent: 4701808 (1987-10-01), Nagashima

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