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    • 7. 发明授权
    • Method for detecting fraud in a printed image
    • 用于检测打印图像中的欺诈的方法
    • US08467566B2
    • 2013-06-18
    • US11245238
    • 2005-10-06
    • Frederick W. Ryan, Jr.
    • Frederick W. Ryan, Jr.
    • G06K9/00
    • G07D7/20H04N1/00846
    • A method is provided for authenticating an image printed at a predefined print resolution or in accordance with a predetermined print grid. The method includes the steps of scanning the image to produce digital data and segmenting the data into first and second groups corresponding, respectively, to first and second predefined sections of the image. Next, a determination is made concerning the anticipated spatial position of select columns of digital data from each of the first and second groups of data. By examining the data, differences may be identified between the anticipated and actual spatial position of the columns, to determine the authenticity of the image. The identified differences which may include (i) a rotary/linear displacement in the actual spatial position of the select columns. (ii) a change in beat frequency between sections of the image, and/or (iii) a phase shift in a beat frequency. Furthermore, the printed image may include a predefined phase shift introduced at the time of original printing, i.e., a change in spatial separation between adjacent columns of the print grid. The predefined phase shift can be used as a mark to validate the authenticity of the printed image.
    • 提供了一种用于认证以预定打印分辨率打印的图像或根据预定打印网格的方法。 该方法包括扫描图像以产生数字数据并将数据分割成分别对应于图像的第一和第二预定部分的第一和第二组的步骤。 接下来,确定来自第一组和第二组数据的数字数据的选择列的预期空间位置。 通过检查数据,可以在列的预期和实际空间位置之间识别差异,以确定图像的真实性。 所识别的差异可以包括(i)选择列的实际空间位置中的旋转/线性位移。 (ii)图像部分之间的拍频的变化和/或(iii)拍频的相移。 此外,打印的图像可以包括在原始打印时引入的预定相移,即打印网格的相邻列之间的空间间隔的改变。 预定义的相移可以用作标记来验证打印图像的真实性。