Patent ID: 9147108
Filing Date: 2015-09-29
Classification: G06K,G07D

Abstract:
1. A method for checking 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, comprising the steps: checking whether a first number of said pixels, or a first share of said pixels in the pixels of the image, 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 prescribed for the security feature, and to determine whether the pixel data in the first reference region are concentrated only in a part of the first reference region or are rather distributed in a wider scatter therein, checking 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 value prescribed for the security feature, and in dependence on the result of checking, generating an authenticity signal which represents an indication of authenticity only when the first number or first share exceeds the first minimum hit value, and the scatter the first minimum scatter value.