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

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.