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1. (WO2018145773) HALFTONE SCREENS ASSOCIATED WITH MOIRÉ EFFECTS BELOW A THRESHOLD

Pub. No.:    WO/2018/145773    International Application No.:    PCT/EP2017/053149
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 14 00:59:59 CET 2017
IPC: H04N 1/52
H04N 1/405
Applicants: HP INDIGO B.V.
Inventors: HAIK, Oren
FRANK, Tal
BEN-SHOSHAN, Yotam
Title: HALFTONE SCREENS ASSOCIATED WITH MOIRÉ EFFECTS BELOW A THRESHOLD
Abstract:
In an example, a method includes determining, using a processor, a set of halftone screens each comprising tiles spanning a plurality of cells, wherein at least one screen is a non-orthogonal screen and the cells comprise parallelograms being defined by a first vector having a first length and second vector having a second length. A first and a second fundamental frequency may be determined for each of the screens using a projection of the first and of the second vector into each axis of a print apparatus reference frame, the first length and the second length. Using the first and second fundamental frequencies, it may be determined which screens are associated with moiré effects below a threshold.