Title:
塊状マイクロドットを用いたデジタルハーフトーン化
Document Type and Number:
Japanese Patent JP7299981
Kind Code:
B2
Abstract:
A halftone raster image, suitable for rendering a continuous-tone image, which comprises a plurality of dots, arranged according a screen ruling and screen angle. Said dots comprise (i) image pixels arranged as a first arc or as a plurality of arcs which together represent a first spiral, and (ii) non-image pixels arranged as a second arc or as a plurality of arcs which together represent a second spiral. Small displacements of the feed point of said dots away from the theoretical centre of a halftone dot, defined by said screen ruling and screen angle, enable a higher image quality and less patterns in said halftone raster image.
Inventors:
Bartels, Rudolph
Application Number:
JP2021531178A
Publication Date:
June 28, 2023
Filing Date:
April 30, 2019
Export Citation:
Assignee:
Agfa Offset BEV
International Classes:
H04N1/405; B41C1/00; B41C1/10; B41M1/04; B41M1/06; B41N1/00; B41N1/14
Foreign References:
| US6538772 | ||||
| EP1684499A2 |
Attorney, Agent or Firm:
Patent Attorney Corporation Odashima Patent Office
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