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    DATA ENCODING AND WORKPIECE AUTHENTICATION USING HALFTONE ONFORMATIN
    2.
    发明申请
    DATA ENCODING AND WORKPIECE AUTHENTICATION USING HALFTONE ONFORMATIN 审中-公开
    使用HONEFT ONFORMATIN进行数据编码和工作认证

    公开(公告)号：WO2003086759A1

    公开(公告)日：2003-10-23

    申请号：PCT/US2003/010800

    申请日：2003-04-07

    Applicant: THE ESCHER GROUP, LTD

    Inventor： METOIS, Eric ,  SMITH, Joshua, R. ,  YARIN, Paul, M.

    IPC: B41B15/00

    CPC classification number: H04N1/52 ,  H04N1/32149 ,  H04N1/32256 ,  H04N1/32309

    Abstract: An encoding system (100) includes data in an underlying image by controlling or modifying halftone settings, which are used in the associated printing color process to produce a hard-copy document or an on screen image. The system (100) uses a halftone encoder (104) to encode the data into the image by selectively varying, in accordance with the data, the order of various color channels, and/or the screen angles using an angle table (105o) and/or spatial frequencies, or scales using a scale table (105r), of associated halftone screens. The system (100) encodes an N-bit payload in the image at the halftone encoder (104) by modifying the halftone settings of certain or all of the color channels in accordance with the data, thus using the color channels also as "data channels." The system (100) prints the encode image at a printer (108) by incorporating the modified halftone settings into the respective halftone screens, and applying the inks in a conventional manner.

    Abstract translation: 编码系统（100）通过控制或修改在相关联的打印颜色处理中使用的半色调设置来产生硬拷贝文档或屏幕图像，包括底层图像中的数据。 系统（100）使用半色调编码器（104）通过使用角度表（105o）和/或角度表（105o）选择性地改变根据数据的各种颜色通道的顺序和/或屏幕角度来将数据编码到图像中 /或空间频率，或使用相关联的半色调屏幕的缩放表（105r）进行缩放。 系统（100）通过根据数据修改某些或所有彩色通道的半色调设置，在半色调编码器（104）的图像中对N位有效载荷进行编码，从而也将颜色通道也用作“数据通道 “。 系统（100）通过将改进的半色调设置结合到相应的半色调屏幕中并以常规方式应用墨水，在打印机（108）上打印编码图像。

    A METHOD FOR GENERATING A SECURITY BI-LEVEL IMAGE FOR A BANKNOTE
    7.
    发明申请
    A METHOD FOR GENERATING A SECURITY BI-LEVEL IMAGE FOR A BANKNOTE 审中-公开
    一种用于生成银行安全性BI级图像的方法

    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。

    GENERAL DATA HIDING FRAMEWORK USING PARITY FOR MINIMAL SWITCHING
    8.
    发明申请
    GENERAL DATA HIDING FRAMEWORK USING PARITY FOR MINIMAL SWITCHING 审中-公开
    一般数据隐藏框架使用极限切换的奇偶性

    公开(公告)号：WO2009045648A1

    公开(公告)日：2009-04-09

    申请号：PCT/US2008/073219

    申请日：2008-08-14

    Applicant: THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY ,  AU, Oscar Chi Lim ,  LI, Richard Yuk Ming

    Inventor： AU, Oscar Chi Lim ,  LI, Richard Yuk Ming

    IPC: H04L9/00

    CPC classification number: H04N1/32203 ,  G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0061 ,  H04N1/32208 ,  H04N1/32229 ,  H04N1/32256 ,  H04N1/32261 ,  H04N1/32336 ,  H04N2201/3233 ,  H04N2201/327

    Abstract: A framework is provided for reducing the number of locations modified when hiding data, such as a digital watermark, in binary data. The framework complements data hiding techniques, such as digital watermarking techniques. After determining potential embedding locations according to an underlying technique, a data structure is created with values associated with those locations. A parity calculation is performed on the values in the data structure. The calculated parity is compared with hidden data to determine locations for modifications. Manipulations are then performed to reduce the total number of modifications needed to represent the hidden data. Modifications are made to the binary data according to the underlying technique. During decoding of the hidden data, the same locations can be determined, the same data structure can be created with the modified values, and a parity calculation is then performed to decode the hidden data.

    Abstract translation: 提供了一种框架，用于减少在二进制数据中隐藏诸如数字水印之类的数据时修改的位置的数量。 该框架补充了数字隐藏技术，如数字水印技术。 根据底层技术确定潜在的嵌入位置后，将创建一个与这些位置相关联的值的数据结构。 对数据结构中的值执行奇偶校验计算。 将计算的奇偶校验与隐藏数据进行比较，以确定修改的位置。 然后执行操作以减少表示隐藏数据所需的修改总数。 根据底层技术对二进制数据进行修改。 在隐藏数据的解码期间，可以确定相同的位置，可以用修改的值创建相同的数据结构，然后执行奇偶校验计算以对隐藏的数据进行解码。

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