Specific set of rotated screens for digital halftoning

Details Specific set of rotated screens for digital halftoning Specific set of rotated screens for digital halftoning

Filed on

1992-09-29

Date issued

1994-03-01

Examiner

Fuller, Benjamin R.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Recording apparatus

Other Related Categories

358456, 358536, 355245, H04N 140, G03G 1506

Type

Patent

Status

active

Patent number

052912965

Description

ABSTRACT:
A set of halftone screens and a write white xerographic system for generating halftone images with a minumum of artifacts. The screens used in a four color printer have at least 64 pixels per pattern and are distributed to creat fourcentered dots that are at either -14, 0,+14 or +45 degrees. The xerographic process involves charging the photoreceptor, partially discharging the photoreceptor with a scanning beam to create an image, and then using toner which adheres to the charged portions of the photoreceptor to create the hard copy.

REFERENCES:
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patent: 4770964 (1988-09-01), Fender
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patent: 4924301 (1990-05-01), Surbrook
patent: 5053887 (1991-10-01), Thompson
patent: 5103265 (1992-04-01), Kohyama
patent: 5166809 (1992-11-01), Surbrook

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