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Method for printing authentication marks by means of an amplitude-modulated raster print

A verification method and grid technology, applied in printing, information-carrying cards, character and pattern recognition, etc.

Active Publication Date: 2021-09-03
尤尼卡系统股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is still the following disadvantage: in all cases additional information - images or graphics - must be encrypted and embedded
Known methods for integrating watermarks cannot be applied to the problem as a solution since copy detection does not involve the transmission of embedded information
Likewise, digital fingerprinting methods for the identification and verification of individual pieces or documents are not applicable to the problem of proving the authenticity of mass prints

Method used

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  • Method for printing authentication marks by means of an amplitude-modulated raster print
  • Method for printing authentication marks by means of an amplitude-modulated raster print
  • Method for printing authentication marks by means of an amplitude-modulated raster print

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0073] Figure 1A The sequence of the first eight grid cell planes 2a to 2h on the bottom of the grid peak formed by 8x8 grid cells 1 is shown. The lowermost plane 2a is the largest feasible grid point with 64 exposed grid elements. The grid point indicated with 3a therefore has the full 100% tone value of the color and is shown next to it. The uppermost, eighth grid plane 2h consists of 57 exposed grid points, corresponding to a tone value of 89% of the grid points 3h. Between them there are six further grid planes 2 b , 2 c , 2 d , 2 e , 2 f and 2 g , which have 63 to 58 grid elements exposed and thus black. These then include grid points 3b, 3c, 3d, 3e, 3f and 3g, wherein all grid elements in the vicinity of the corners are not exposed. In addition to this sequence of grid cell planes, the gray or halftone wedges 4 corresponding to the grid cell planes are shown. This corresponds to the known method of amplitude modulation, in which different tonal values ​​are represen...

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PUM

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Abstract

The invention relates to a method for printing authentication marks by applying an at least amplitude-modulated raster print in a detection zone onto an object. The method uses raster cells (100) adjoining each other, in each of which cells a raster point (101) from a matrix of printable raster elements (102) is printed, wherein individual tonal values of the raster print each correspond to a raster layer of a raster mountain (20) for a raster point (101). The associated raster layer of the raster mountain (1) is modified in the detection zone in a predetermined manner for a plurality of tonal values of raster points (101) to be printed, such that a predetermined matrix pattern (24) of the raster elements (102) to be printed is assigned thereto when the tonal value of the print remains constant.

Description

technical field [0001] The invention relates to a method for printing authentication markings by applying an at least amplitude-modulated raster print to an object in a test zone, wherein the printed surface of the test zone comprises grid cells adjacent to each other, in which Grid points in a matrix of printable grid elements are printed in grid cells, respectively. Background technique [0002] The present need for effective anti-counterfeit product protection goes far beyond the sole application of unique visual features that were considered sufficient until a few years ago. Holograms, in particular, have a reputation for being good enough for high-quality protection. Given the tens of thousands of hologram production and reproduction studios around the world, the value of hologram applications on packaging becomes very relative. No comparison of the original of the package with its counterfeit escapes the untrained eye, while a person skilled in the art does not need ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D25/405B42D25/21B42D25/378G07D7/20G06K9/00
CPCG07D7/20B42D25/21B42D25/378B42D25/405G07D7/0054G07D7/12G06V10/751G06V20/95H04N1/32245H04N1/32256H04N1/32309H04N1/4051
Inventor 克劳斯·弗兰肯
Owner 尤尼卡系统股份有限公司