Apparatus for producing a bilevel image suitable for a printing

Details Apparatus for producing a bilevel image suitable for a printing Apparatus for producing a bilevel image suitable for a printing

1993-08-18

1995-01-31

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358444, 358448, 358455, 358465, 358296, H04N 140

Patent

active

053863011

ABSTRACT:
An image processing apparatus includes a reading part for reading an image by raster scanning of a document and for producing a multilevel image data relating to one pixel of the image, a memory part for storing a plurality of predetermined weight matrix patterns, each weight matrix pattern having N.times.N weight coefficients arranged in an N.times.N formation, a selecting part for selecting one of the plurality of predetermined weight matrix patterns based on a printing characteristic of a printing unit that prints a bi-level processed image, a processing part for adding a weight coefficient read from the selected weight matrix pattern to the multilevel image data relating to one pixel from the reading part so that a weighted multilevel image data is produced, and a binarizing part for processing the weighted multilevel image data by using a binarizing process based on an error scattering method to produce a bi-level signal relating to one dot of a processed image, and for supplying the bi-level signal to the printing unit to print the processed image.

REFERENCES:
patent: 5006938 (1991-04-01), Mita
patent: 5067027 (1991-11-01), Yano
patent: 5077615 (1991-12-01), Tsuji
patent: 5097520 (1992-03-01), Bessho et al.
patent: 5150428 (1992-09-01), Leone et al.
patent: 5177623 (1993-01-01), Hirota
patent: 5243445 (1993-09-01), Koike
patent: 5259042 (1993-11-01), Matsuki et al.
patent: 5289294 (1994-02-01), Fujisawa

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