Method for checking the production quality of an optical security feature of a value document

US9202327B2 · kind B2 · utility

Assignee

• GIESECKE & DEVRIENT GMBH · DE

Inventors

• Shanchuan Su · Neubiberg, DE
• Norbert Holl · Germering, DE

Key dates

• Filing date: Sep 25, 2012
• Grant date: Dec 1, 2015
• Expiry date: Sep 25, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/2041
• WIPO field: Control
• WIPO sector: Instruments

Abstract

A method for checking the production quality of a prescribed optical security feature in or on a prescribed portion of a value document on the basis of pixel data of pixels of an image of the prescribed portion which are respectively associated with places in or on the portion and render optical properties of the value document at the places whether a first number or share of those pixels, whose pixel data, according to a first prescribed criterion, lie within a first reference region prescribed for the security feature exceeds a first minimum hit value, and whether a first scatter of the pixel data of those pixels lying within the first reference region for the pixel data according to the first criterion exceeds a first minimum scatter prescribed for the security feature. A quality signal from the check represents an indication of a sufficient printing quality according to certain criteria.