Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

ALIASING SUPPRESSION IN XEROGRAPHIC HALFTONING

IP.com Disclosure Number: IPCOM000023696D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 191K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an electronic halftone process in which the half-toning threshold is adjusted as a function of the average grey value of the original, wherein the average grey value is determined by algebraically combining the integrated results of an in phase and out of phase grey level value, The in phase and out of phase values are obtained by utilizing two sampling apertures, and the resulting function may be converted to a grey level using an analog technique or a digitized table look up. This will enable one to project the probable adjustment needed in the threshold level, this adjustment being accom-plished by changing additive screen exposure, additional flare exposure or in a spot illuminated system, the exposure of the original.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

ALIASING SUPPRESSION IN Proposed Classification
XEROGRAPHIC HALFTONING U,S, C1~ 96/1
Paul G~ Roetling mt. Cl. G03g

Disclosed is an electronic halftone process in which the half~
toning threshold is adjusted as a function of the average grey
value of the original, wherein the average grey value is
determined by algebraically combining the integrated results
of an in phase and out of phase grey level value, The in phase
and out of phase values are obtained by utilizing two sampling
apertures, and the resulting function may be converted to a
grey level using an analog technique or a digitized table look
up. This will enable one to project the probable adjustment
needed in the threshold level, this adjustment being accom~
plished by changing additive screen exposure, additional flare
exposure or in a spot illuminated system, the exposure of the
original.

Volume 3 Number 6 November/December 1978 363

[This page contains 1 picture or other non-text object]

Page 2 of 2

                 XEROX DISCLOSURE JOURNAL
364 Volume 3 Number 6 November/December 1978

[This page contains 1 picture or other non-text object]