公开(公告)号：EP1096433A2

公开(公告)日：2001-05-02

申请号：EP00118891.1

申请日：2000-08-31

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Keshet, Renato ,  Shaked, Doron

IPC分类号： G07D7/20

CPC分类号： G06K9/4671 ,  G06K9/4609 ,  G06K9/4652 ,  G07D7/20

摘要： A system (10) and a method for preventing counterfeiting activities utilize an image detection scheme that uses only a few portions of restricted-document images, i.e., templates, to determine whether an input image is a duplicate of a restricted-document image. The image detection scheme can reliably operate at very low resolutions, which allows the use of small kernels for image correlation and reduces the number of pixels that have to be actually processed. The system is designed to be incorporated into a host device, such as a copy machine (12), a scanner (14), a personal computer (16) or a printer (18), to detect a potential counterfeiting activity, so that an appropriate action can be taken to prevent and/or to report the detected activity. The image detection scheme allows the system to operate at an increased detection speed, while minimizing the memory requirement. During an off-line training procedure, a training module (32) of the system derives a parameter file that contains detection descriptors for the restricted-document images, including threshold intervals that are defined using selected kernels and templates of the restricted-document images. The type of kernels and templates selected by the training module can vary, depending on the desired memory requirement and the desired on-line performance. During an on-line detection procedure, a detection module (24) of the system projects portions of the input image and compares the resulting projection value with the threshold intervals to derive template match candidates. The relative coordinates of the template match candidates in the input image are then compared with relative coordinates of the templates in the restricted-document images to determine if the input image matches a particular restricted-document image.

摘要翻译： 系统（10）和防止假冒活动的方法利用仅使用少数限制文件图像（即，模板）的图像检测方案来确定输入图像是否是受限制文档图像的副本。 图像检测方案可以以非常低的分辨率可靠地运行，这允许使用小的内核进行图像相关，并减少必须实际处理的像素数量。 该系统被设计为并入到诸如复印机（12），扫描仪（14），个人计算机（16）或打印机（18）的主机设备中，以检测潜在的假冒活动，使得 可以采取适当的行动来防止和/或报告检测到的活动。 图像检测方案允许系统以提高的检测速度运行，同时最小化存储器需求。 在离线训练过程中，系统的训练模块（32）导出包含受限制文档图像的检测描述符的参数文件，包括使用所选择的内核和限制文档图像的模板定义的阈值间隔。 训练模块选择的内核和模板的类型可以根据所需的内存要求和所需的在线性能而有所不同。 在在线检测过程中，系统的检测模块（24）投影输入图像的部分，并将所得到的投影值与阈值间隔进行比较以得到模板匹配候选。 然后将输入图像中的模板匹配候选的相对坐标与限制文档图像中的模板的相对坐标进行比较，以确定输入图像是否与特定的限制文档图像匹配。

公开(公告)号：EP1096433A3

公开(公告)日：2003-12-03

申请号：EP00118891.1

申请日：2000-08-31

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Keshet, Renato ,  Shaked, Doron

IPC分类号： G07D7/20 ,  H04N1/00 ,  G06K9/00

CPC分类号： G06K9/4671 ,  G06K9/4609 ,  G06K9/4652 ,  G07D7/20

摘要： A system (10) and a method for preventing counterfeiting activities utilize an image detection scheme that uses only a few portions of restricted-document images, i.e., templates, to determine whether an input image is a duplicate of a restricted-document image. The image detection scheme can reliably operate at very low resolutions, which allows the use of small kernels for image correlation and reduces the number of pixels that have to be actually processed. The system is designed to be incorporated into a host device, such as a copy machine (12), a scanner (14), a personal computer (16) or a printer (18), to detect a potential counterfeiting activity, so that an appropriate action can be taken to prevent and/or to report the detected activity. The image detection scheme allows the system to operate at an increased detection speed, while minimizing the memory requirement. During an off-line training procedure, a training module (32) of the system derives a parameter file that contains detection descriptors for the restricted-document images, including threshold intervals that are defined using selected kernels and templates of the restricted-document images. The type of kernels and templates selected by the training module can vary, depending on the desired memory requirement and the desired on-line performance. During an on-line detection procedure, a detection module (24) of the system projects portions of the input image and compares the resulting projection value with the threshold intervals to derive template match candidates. The relative coordinates of the template match candidates in the input image are then compared with relative coordinates of the templates in the restricted-document images to determine if the input image matches a particular restricted-document image.