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    • 3. 发明授权
    • Method for detecting forged barcodes
    • 检测伪造条形码的方法
    • US07438231B2
    • 2008-10-21
    • US11543496
    • 2006-10-05
    • Robert A. CorderyBertrand HaasHongmei Gou
    • Robert A. CorderyBertrand HaasHongmei Gou
    • G06K7/10
    • G07D7/0043
    • A method of printing a two-dimensional barcode by tilting the print head, which results in tilted barcode, and methods of detecting various types of attempts to forge the tilted barcode including: (i) a low level forgery that consists of a simple scan and reprint of the barcode, (ii) a low level forgery that consists of a reproduction (i.e., a read and regeneration) and subsequent printing of the barcode using a printer with a non-tilted print head by a fraudster that is not aware of the tilt in the original barcode, and (iii) a higher level forgery by a fraudster that is aware of the tilt in the original barcode and that digitally tilts/shears an image of the barcode and prints the digitally tilted/sheared image using a printer with a non-tilted print head in an effort to mimic the tilt present in the legitimate barcode.
    • 通过倾斜打印头来打印二维条形码的方法,其导致倾斜的条形码,以及检测各种类型的伪造倾斜条形码的尝试的方法,包括:(i)低级伪造,其由简单的扫描和 重新打印条形码,(ii)由再现(即读取和再生)组成的低级伪造以及随后使用不知道该条形码的欺诈者使用具有非倾斜打印头的打印机打印条形码 倾斜原始条形码,以及(iii)知道原始条形码倾斜的欺诈者的更高级别的伪造,并且数字地倾斜/剪切条形码的图像,并使用带有打印机的打印机打印数字倾斜/剪切的图像 非倾斜打印头,以模拟合法条形码中存在的倾斜。
    • 7. 发明授权
    • Method for concealing data in curves of an image
    • 隐藏图像曲线中数据的方法
    • US07817817B2
    • 2010-10-19
    • US11221727
    • 2005-09-09
    • Min WuHongmei Gou
    • Min WuHongmei Gou
    • G06K9/00
    • G06T1/005G06T1/0028G06T2201/0051G06T2201/0063G06T2201/0065
    • A method of concealing data in images imperceptibly alters curves therein, such as through adding a value representing the data to be hidden to each of a number of B-spline control points representing the original curve. The altered control points characterize the imperceptibly altered curve, which replaces the original curve in the image. The altered control points may be later extracted from the image and compared with the original control points to determine the hidden value. Prudent selection of the values altering the control points as well as an iterative alignment-minimization algorithm in the detection process provides protection against numerous techniques for preventing the hidden values from being recovered.
    • 隐藏图像中的数据的方法不可察觉地改变其中的曲线,例如通过向表示原始曲线的多个B样条控制点中的每一个添加表示要隐藏的数据的值。 改变的控制点表征了不可察觉地改变的曲线,这取代了图像中的原始曲线。 可以稍后从图像中提取改变的控制点,并与原始控制点进行比较以确定隐藏值。 改变控制点的值的谨慎选择以及检测过程中的迭代对齐最小化算法提供了针对许多防止隐藏值被恢复的技术的保护。
    • 8. 发明授权
    • Method of reconstructing an image
    • 重建图像的方法
    • US07649658B2
    • 2010-01-19
    • US11636802
    • 2006-12-11
    • Robert A. CorderyBertrand HaasHongmei Gou
    • Robert A. CorderyBertrand HaasHongmei Gou
    • H04N1/46H04N1/40
    • H04N1/387
    • A method of reconstructing an original image from a printed and scanned image includes determining a plurality of transformation parameters including a rotation a of the scanning grid relative to the printing grid and a plurality of translation parameters which give a position of a node on the printing grid in a coordinate system of the scanning grid, generating a system of non-linear equations which represent the printed and scanned image as a function of: (i) the original image, (ii) a print/scan resolution ratio, and (iii) the transformation parameters, computing coefficients for the system using the resolution ratio, the transformation parameters and the given print model, generating a linear approximation of the system of non-linear equations, solving the linear approximation for an approximation of the original image, and creating a reconstructed original image from the approximation of the original image.
    • 从打印和扫描图像重建原始图像的方法包括确定包括扫描网格相对于打印网格的旋转a的多个变换参数以及给出打印网格上的节点的位置的多个平移参数 在扫描网格的坐标系中,产生表示打印和扫描图像的非线性方程式的系统作为以下功能的函数:(i)原始图像,(ii)打印/扫描分辨率,和(iii) 变换参数,使用分辨率的系统的计算系数,变换参数和给定的打印模型,生成非线性方程组的线性近似,求解原始图像近似的线性近似,以及创建 来自原始图像近似的重建的原始图像。