公开(公告)号：US20160352962A1

公开(公告)日：2016-12-01

申请号：US15114422

申请日：2015-01-28

Applicant: KBA-NOTASYS SA

Inventor： Jan-Friedrich EHLENBRÖKER ,  Volker LOHWEG

IPC: H04N1/32 ,  H04N1/00

CPC classification number: H04N1/32149 ,  G07D7/005 ,  G07D7/2033 ,  H04N1/00838 ,  H04N2201/327

Abstract: There is described a new coding approach for printed document authentication, one objective of which is to increase the difficulty of copying. In addition, this new coding approach provides better performance compared to other 2D coding technolo gies under certain constraints. The new coding technique requires less print space in comparison to other coding techniques. This is achieved by optimising some of the features which are used in standard 2D-codes for stabilisation and which are necessary for e.g. mobile applications. Furthermore, the code can be decomposed in elementary units, or “byte-units” which can be widely spread over a text document. Such “byte-units” can in particular be used for integration in text symbols. If a document protected with such a coding is copied, at least some of these symbols will be extensively degraded by the copying process. Therefore, copy detection is intrinsically achieved thanks to the new coding technique.

Abstract translation: 描述了用于打印文件认证的新的编码方法，其目的是增加复制的难度。 此外，与其他2D编码技术相比，这种新的编码方法在某些限制下提供了更好的性能。 与其他编码技术相比，新的编码技术需要更少的打印空间。 这通过优化用于稳定化的标准2D代码中的一些特征来实现，并且对于例如， 移动应用。 此外，代码可以以基本单位分解，或者可以广泛分布在文本文档上的“字节单位”。 这样的“字节单位”可以特别地用于集成在文本符号中。 如果复制了用这种编码保护的文档，则这些符号中的至少一些将被复制过程广泛地降级。 因此，通过新的编码技术，本质上实现了拷贝检测。

公开(公告)号：US20160012658A1

公开(公告)日：2016-01-14

申请号：US14764061

申请日：2014-02-04

Applicant: KBA-NOTASYS SA

Inventor： Volker LOHWEG ,  Jan Leif HOFFMANN ,  Helene DÖRKSEN ,  Roland HILDEBRAND ,  Eugen GILLICH ,  Jürg HOFMANN ,  Johannes Georg SCHAEDE

IPC: G07D7/20 ,  G06K9/22 ,  G06T7/00 ,  G06K9/00 ,  G06K9/48

CPC classification number: G07D7/20 ,  G06K9/00442 ,  G06K9/00516 ,  G06K9/22 ,  G06K9/48 ,  G06K2009/488 ,  G06T7/0002 ,  G06T7/168 ,  G06T2207/20064 ,  G06T2207/30176 ,  G07D7/003 ,  G07D7/2016

Abstract: A method of authenticating security documents and a mobile device, especially a smartphone, programmed to carry out the method, based on an analysis of features which are produced by intaglio printing, which analysis involves a decomposition of sample images of a candidate document to be authenticated based on Wavelets, each sample image being digitally processed by performing a Wavelet transform of the sample image in order to derive a set of classification features. The method is based on an adaptive approach, which includes the following steps: —prior to carrying out the Wavelet transform, defining a categorization map containing local information about different intaglio line structures that are found on the security documents; —carrying out a Wavelet selection amongst a pool of Wavelet types based on the categorization map; and —performing the Wavelet transform of the sample image on the basis of the selected Wavelet.

Abstract translation: 基于通过凹版印刷产生的特征的分析，验证安全文件和移动设备，特别是智能手机的方法，其被编程为执行该方法，该分析涉及要认证的候选文档的样本图像的分解 基于小波，通过执行样本图像的小波变换来对每个样本图像进行数字处理，以便导出一组分类特征。 该方法基于自适应方法，其包括以下步骤：在执行小波变换之前，定义包含有关安全文档上找到的不同凹版线结构的本地信息的分类图; - 根据分类图在小波类别池中进行小波选择; 并且基于所选择的小波执行样本图像的小波变换。