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1. 发明申请

WO2006016114A1 AUTHENTICITY VERIFICATION OF ARTICLES USING A DATABASES 审中-公开
标题翻译：使用数据库验证文章
公开(公告)号：WO2006016114A1
公开(公告)日：2006-02-16
申请号：PCT/GB2005/003003
申请日：2005-07-29
申请人： INGENIA TECHNOLOGY LIMITED , COWBURN, Russel, P.
发明人： COWBURN, Russel, P.
IPC分类号： G06F17/30
CPC分类号： G06K9/52 , G06K9/00577 , G06K9/522 , G07D7/004 , G07D7/0043 , G07D7/01 , G07D7/20
摘要： A digital signature is obtained by digitising a set of data points obtained by scanning a coherent beam over a paper, cardboard or other article, and measuring the scatter. A thumbnail digital signature is also determined by digitising an amplitude spectrum of a Fourier transform of the set of data points. A database of digital signatures and their thumbnails can thus be built up. The authenticity of an article can later be verified by re-scanning the article to determine its digital signature and thumbnail, and then searching the database for a match. Searching is done on the basis of the Fourier transform thumbnail to improve search speed. Speed is improved, since, in a pseudo-random bit sequence, any bit shift only affects the phase spectrum, and not the amplitude spectrum, of a Fourier transform represented in polar coordinates. The amplitude spectrum stored in the thumbnail can therefore be matched without any knowledge of the unknown bit shift caused by registry errors between the original scan and the re-scan.
摘要翻译：通过将通过在纸，纸板或其它物品上扫描相干光束而获得的一组数据点进行数字化并测量散射来获得数字签名。还通过数字化该组数据点的傅里叶变换的幅度谱来确定缩略图数字签名。因此可以建立数字签名及其缩略图数据库。文章的真实性可以稍后通过重新扫描文章来确定其数字签名和缩略图，然后搜索数据库进行匹配来验证。在傅里叶变换缩略图的基础上进行搜索，以提高搜索速度。速度得到改善，因为在伪随机比特序列中，任何比特移位仅影响以极坐标表示的傅立叶变换的相位频谱，而不影响幅度谱。因此，存储在缩略图中的幅度谱可以匹配，而不知道由原始扫描和重新扫描之间的注册表错误引起的未知位移位。

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