公开(公告)号：EP2010389B1

公开(公告)日：2011-06-08

申请号：EP07735442.1

申请日：2007-04-10

Applicant: KBA-NotaSys SA

Inventor： MANFREDI, Renato ,  FORESTI, Jean-François

IPC: B41C1/05

CPC classification number: H04N1/405 ,  B41C1/05 ,  B41M1/10 ,  B41M3/14 ,  B42D25/21 ,  B42D2035/26

Abstract: A method is described for generating patterns representing a halftone image, said method comprising the generation of a first set of patterns (10) consisting of lines and curves dimensionally modulated so as to produce variations in tones reproducing the halftones of the image using an intaglio rendering technique. The method comprises the generation of a second set of patterns (20; 30) consisting of microstructures separate from the lines and curves of the first set of patterns, said microstructures being dimensionally modulated so as to produce variations in tones reproducing the halftones of the image. According to a first aspect of the invention, the microstructures consist of stochastic microstructures that can be likened to a grain. According to a second aspect of the invention, the microstructures consist of repetitive microstructures reproducing information that can be recognised by an observer, which repetitive microstructures comprise microletters and/or microsymbols. The second set of patterns is interlaced with the first set of patterns in such a way that the microstructures of the second set of patterns occupy the spaces between the lines and curves of the first set of patterns and so that the halftones reproduced by the second set of patterns supplement the halftones reproduced by the first set of patterns.

Abstract translation: 该方法涉及生成一组模式（10），其中线和曲线被调整以产生修正图像的半色调的色调变化。 产生具有与线和曲线不同的微结构的另一组图案（20），其中微观尺寸被调整以产生修正图像的半色调的色调变化。 这些图案是交错的，使得微结构占据线和曲线之间的空间，并且由图案（20）恢复的半色调完成由图案（10）恢复的半色调。 独立权利要求还包括以下内容：（1）半色调印版（2）的制造方法，其包括表示半色调图像的图案的雕刻板。