Image forming device which can form an image by printing a plura

Details Image forming device which can form an image by printing a plura Image forming device which can form an image by printing a plura

1990-01-09

1992-04-14

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358459, 358466, H04N 121, H04N 140

Patent

active

051052806

ABSTRACT:
An image forming device which can form an image by printing a plurality of dots based on an image information that contains a plurality of density data corresponding to a plurality of pixels defined by the fractionalization of the original image, and which can express the density of an image by controlling the number of dots to be printed within a predetermined tone unit area. The image forming device includes a threshold pattern generator for generating a threshold pattern which is a repetition of a basic pattern including a predetermined number "L" of thresholds, a comparator for comparing respective density data with a predetermined number "M" of thresholds selected from all "L" of the thresholds in which "L" is not an integer multiple of "M", and for producing a predetermined number "M" of print data corresponding to the respective density data; and a printer for printing on a printing sheet dots corresponding to the "M" print data in a line along a main scanning direction.

REFERENCES:
patent: 4717964 (1988-01-01), Abe et al.
patent: 4800442 (1989-01-01), Riseman et al.
patent: 4814886 (1989-03-01), Kuge et al.
patent: 4903123 (1990-02-01), Kawamura et al.
patent: 4924301 (1990-05-01), Surbrook
patent: 4933776 (1990-06-01), Ikeda
patent: 4958239 (1990-09-01), Yamada et al.

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