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1. WO2020221684 - DIGITAL HALFTONING WITH SPIRAL DOTS

Publication Number WO/2020/221684
Publication Date 05.11.2020
International Application No. PCT/EP2020/061602
International Filing Date 27.04.2020
IPC
H04N 1/405 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
1Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
40Picture signal circuits
405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
B41M 1/04 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
1Inking and printing with a printer's forme
02Letterpress printing, e.g. book printing
04Flexographic printing
B41M 1/06 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
1Inking and printing with a printer's forme
06Lithographic printing
B41J 2/205 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
2Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
005characterised by bringing liquid or particles selectively into contact with a printing material
01Ink jet
205for printing a discrete number of tones
Applicants
  • AGFA NV [BE]/[BE]
Inventors
  • BARTELS, Rudolf
Agents
  • STRIJCKERS, Hans
Priority Data
19171925.130.04.2019EP
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DIGITAL HALFTONING WITH SPIRAL DOTS
(FR) DEMI-TEINTE NUMÉRIQUE À POINTS EN SPIRALE
Abstract
(EN)
A halftone raster image, suitable for rendering a continuous-tone image, which comprises a plurality of regularly tiled spiral dots. Said spiral dots comprise (i) image pixels arranged as a first arc (200) or as a plurality of arcs which together represent a first spiral (100), and (ii) non-image pixels arranged as a second arc (201) or as a plurality of arcs which together represent a second spiral (101). wherein neighbour halftone dots from said plurality of regularly tiled halftone dots represent a double spiral or triple spiral.
(FR)
L'invention concerne une image tramée en demi-teinte, appropriée pour rendre une image en tons continus, qui comprend une pluralité de points en spirale régulièrement carrelés. Lesdits points en spirale comprennent (i) des pixels d'image agencés sous la forme d'un premier arc (200) ou sous la forme d'une pluralité d'arcs qui représentent ensemble une première spirale (100), et (ii) des pixels non-image agencés sous la forme d'un second arc (201) ou sous la forme d'une pluralité d'arcs qui représentent ensemble une seconde spirale (101), les points en demi-teinte voisins de ladite pluralité de points en spirale régulièrement carrelés représentent une double spirale ou une triple spirale.
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