| 摘要 |
A security barcode is made up of modules that include optical disrupters that are too small to be deliberately placed in precise positions. The barcode is authenticated by a simple webcam including three-dimensional positioning means co-operating with a recognizable graphic structure referred to as a “marker”. In order to establish the authenticity of an article protected by the code, a description of the code is made after the code has been printed and is stored in a database, and that description is compared with a new description that results from at least two acquisitions, one made under the same conditions, and the other made while changing the three-dimensionally defined viewpoint and/or the lighting. In its preferred variant, the barcode cannot be printed in order to represent a predetermined number. It is also impossible to reproduce the barcode. |
| 主权项 |
1. An authentication method consisting in establishing a subsequent description of an authentication device that comprises a coded entity, itself comprising light-disrupting elements referred to as “disrupters”, and in comparing this description with an original description of said authentication device, wherein:
said disrupters are grouped together in sub-entities referred to as “modules”, with a module returning light in perceptibly different ways depending on the point of view from which it is observed; a description includes an operation referred to below as “acquisition” that consists in using acquisition means for measuring the brightness of a plurality of said modules, at one or more wavelengths or sets of wavelengths; said original description is established from an acquisition made from an original viewpoint defined relative to said authentication device; and the procedure enabling said subsequent description to be established and enabling said comparison to be made comprises:
using positioning means that co-operate with a recognizable graphics structure referred to as a “marker” to determine the three-dimensional position in which said acquisition means are located relative to said authentication device;taking an acquisition while said acquisition means are placed close to the original viewpoint; andtaking at least one additional acquisition:
either from a viewpoint that is perceptibly different from said original viewpoint;or else under lighting that is different from that used for the acquisition that was used for establishing said original description. |
