Halftone image forming apparatus including density based dot enl

Details Halftone image forming apparatus including density based dot enl Halftone image forming apparatus including density based dot enl

1992-03-27

1994-08-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358534, 358454, 358456, 358458, 358459, 358462, H04N 140, H04N 146

Patent

active

053371674

ABSTRACT:
An image formation apparatus for performing a gradation recording by changing a size of a dot on the basis of an image data inputted to the apparatus. The apparatus divides an image into a plurality of blocks each comprising a predetermined number of pixels and gives a preferential order with respect to a position within each of the plurality of divided blocks. When the preferential order is higher, the size of the corresponding dot is first enlarged on the basis of a density of the image data. This arrangement can prevent generation of a texture and deterioration of the image resolution irrespective of the case that characters or line drawings are mixed with half-tone pictures in the image.

REFERENCES:
patent: 4931881 (1990-06-01), Matsui et al.
patent: 4996602 (1991-02-01), Ono et al.
patent: 5111302 (1992-05-01), Chan et al.

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