Image forming method and apparatus

Details Image forming method and apparatus Image forming method and apparatus

Filed on

1995-02-24

Date issued

1997-05-06

Examiner

Boudreau, Leo

Patent Class

Image analysis

SubClass

Image enhancement or restoration

Other Related Categories

358457, G06K 940

Type

Patent

Status

active

Patent number

056279191

Description

ABSTRACT:
An image forming apparatus includes an input unit for inputting image data and a converter for converting the input image data into dot information. An image forming circuit controls a scan optical system on the basis of the dot information to form an image. The converter converts the image data into dot information having a screen angle by repeatedly using a predetermined threshold matrix so that the dot information appears preferentially in a sub-scan direction, perpendicular to the main-scan direction of the scan optical system. In the threshold matrix, threshold values are arranged so that their levels increase preferentially in the sub-scan direction.

REFERENCES:
patent: 4698778 (1987-10-01), Ito et al.
patent: 4814886 (1989-03-01), Kuge et al.
patent: 4903123 (1990-02-01), Kawamura et al.
patent: 5124802 (1992-06-01), Ito et al.
patent: 5148287 (1992-09-01), Kemmochi et al.

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