公开(公告)号：WO2011029845A2

公开(公告)日：2011-03-17

申请号：PCT/EP2010/063173

申请日：2010-09-08

Applicant: EUROPEAN CENTRAL BANK (ECB) ,  RUDAZ, Nicolas ,  KUTTER, Martin ,  JORDAN, Frédéric ,  GILLES, Jean-Claude ,  DURANT, Pierre

Inventor： RUDAZ, Nicolas ,  KUTTER, Martin ,  JORDAN, Frédéric ,  GILLES, Jean-Claude ,  DURANT, Pierre

IPC: H04N1/32 ,  H04N1/00 ,  G06T1/00

CPC classification number: G07D7/20 ,  H04N1/32203 ,  H04N1/32208 ,  H04N1/32256 ,  H04N1/32293 ,  H04N1/32325 ,  H04N2201/328

Abstract: The present invention proposes a method for generating a security bi-level image used to form one of the inks of a banknote, said image comprising an original bi-level image and a security pattern, said security pattern being obtained in the spatial domain by the inverse Fourier transform of the combination in the frequency domain between the Fourier transform of an auxiliary image and a two-dimensional sweep, said two-dimensional sweep being a circularly symmetric, two-dimensional pattern created by sweeping a self-similar, one-dimensional function along a 360-degree arc, such as said security pattern being detectable from the maximum value of the cross- correlation of said one-dimensional function with the Fourier transform of one line of said banknote, said method comprising the step of: -determining a distance map of the original bi-level image, -generating a merged image by linearly interpolating at least a part of said distance map with said security pattern, -thresholding the merged image to obtain the security bi-level image, -applying the security bi-level image on a support.

Abstract translation: 本发明提出了一种用于生成用于形成钞票的油墨之一的安全双层图像的方法，所述图像包括原始双层图像和安全图案，所述安全图案 通过在辅助图像的傅立叶变换和二维扫描之间的频域中的组合的逆傅里叶变换在空间域中获得，所述二维扫描是通过扫描产生的圆对称的二维图案 沿着360度圆弧的自相似的一维函数，诸如所述安全模式可从所述一维函数与所述钞票的一行的傅立叶变换的互相关的最大值中检测到，所述安全模式表示 方法，该方法包括以下步骤： - 确定原始二值图像的距离图， - 通过用所述安全图案线性内插所述距离图的至少一部分来生成合并图像， - 树 保存合并的图像以获得安全双层图像， - 将安全双层图像应用在支撑上。

公开(公告)号：WO2011029845A3

公开(公告)日：2011-06-16

申请号：PCT/EP2010063173

申请日：2010-09-08

Applicant: EUROP CENTRAL BANK ECB ,  RUDAZ NICOLAS ,  KUTTER MARTIN ,  JORDAN FREDERIC ,  GILLES JEAN-CLAUDE ,  DURANT PIERRE

Inventor： RUDAZ NICOLAS ,  KUTTER MARTIN ,  JORDAN FREDERIC ,  GILLES JEAN-CLAUDE ,  DURANT PIERRE

IPC: H04N1/32 ,  G06T1/00 ,  H04N1/00

CPC classification number: G07D7/20 ,  H04N1/32203 ,  H04N1/32208 ,  H04N1/32256 ,  H04N1/32293 ,  H04N1/32325 ,  H04N2201/328

Abstract: The present invention proposes a method for generating a security bi-level image used to form one of the inks of a banknote, said image comprising an original bi-level image and a security pattern, said security pattern being obtained in the spatial domain by the inverse Fourier transform of the combination in the frequency domain between the Fourier transform of an auxiliary image and a two-dimensional sweep, said two-dimensional sweep being a circularly symmetric, two-dimensional pattern created by sweeping a self-similar, one-dimensional function along a 360-degree arc, such as said security pattern being detectable from the maximum value of the cross- correlation of said one-dimensional function with the Fourier transform of one line of said banknote, said method comprising the step of: -determining a distance map of the original bi-level image, -generating a merged image by linearly interpolating at least a part of said distance map with said security pattern, -thresholding the merged image to obtain the security bi-level image, -applying the security bi-level image on a support.

Abstract translation: 本发明提出了一种用于生成用于形成纸币的油墨之一的安全双层图像的方法，所述图像包括原始双层图像和安全图案，所述安全图案是在空间域中由 在辅助图像的傅里叶变换与二维扫描之间的频域中的组合的逆傅立叶变换，所述二维扫描是通过扫描自相似的一维扫描而形成的圆对称的二维图案 可以从所述一维功能的互相关的最大值与所述钞票的一行的傅里叶变换中检测出诸如所述安全模式之类的360度弧的功能，所述方法包括以下步骤： - 确定 原始双层图像的距离图， - 通过用所述安全模式线性内插所述距离图的至少一部分来生成合并图像， - 对我进行阈值 获得安全双层图像，将安全双层映像应用于支持。