公开(公告)号：EP1130539B1

公开(公告)日：2006-06-14

申请号：EP00117780.7

申请日：2000-08-18

申请人： Hewlett-Packard Company A Delaware Corporation

发明人： Miquel, Antoni Gil ,  Gracia, Joan Manuel ,  Zapata, Elizabeth ,  Baharav, Izhak ,  Shaked, Doron ,  Garcia, Santiago

IPC分类号： G06K15/10 ,  B41J2/165

CPC分类号： H04N1/128 ,  G06K15/107 ,  G06K2215/0085 ,  G06K2215/111 ,  H04N1/1906 ,  H04N1/1911

公开(公告)号：EP0895408B1

公开(公告)日：2004-05-06

申请号：EP98305938.7

申请日：1998-07-27

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Shaked, Doron ,  Arad, Nur ,  Fitzhugh, Andrew ,  Sobel, Irwin ,  McGuire, Michael D.

IPC分类号： H04N1/52

CPC分类号： H04N1/52

公开(公告)号：EP1130539A3

公开(公告)日：2002-09-25

申请号：EP00117780.7

申请日：2000-08-18

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Miquel, Antoni Gil ,  Gracia, Joan Manuel ,  Zapata, Elizabeth ,  Baharav, Izhak ,  Shaked, Doron ,  Gracia, Santiago

IPC分类号： G06K15/10 ,  B41J2/165

CPC分类号： H04N1/128 ,  G06K15/107 ,  G06K2215/0085 ,  G06K2215/111 ,  H04N1/1906 ,  H04N1/1911

摘要： One invention aspect forms a mask and matrix of corresponding backups for values in the mask, checks when a mask value is not working, and replaces only that value with only a matching matrix entry. A second matrix of further backups is best formed. Another aspect forms a mask as a matrix of stacks of matching entries for mask positions; selects an entry for each position from the matching matrix stack; and prints using the selected entry at each position. Preferably the selecting includes rotating the stack; and applying to each entry a selection probability related to numerical weighting of printing elements; reflect firing-frequency limitation has higher authority than weights. Another aspect forms a mask as a matrix of stacks of matching entries for mask positions, and rotates each stack to select an entry for each position. Another aspect forms a mask and a matrix of stacks of backups; finds nonworking mask values and replaces such values with backups from a matching stack. Another aspect forms a seminal mask, tiles it to make a larger one with related properties, and injects noise to disrupt tiling-caused regularity and form a less-regular mask. Preferably the mask is cubical, each side a number of pixels or layers about equal to number of passes.

公开(公告)号：EP1130539A2

公开(公告)日：2001-09-05

申请号：EP00117780.7

申请日：2000-08-18

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Miquel, Antoni Gil ,  Gracia, Joan Manuel ,  Zapata, Elizabeth ,  Baharav, Izhak ,  Shaked, Doron ,  Gracia, Santiago

IPC分类号： G06K15/10

CPC分类号： H04N1/128 ,  G06K15/107 ,  G06K2215/0085 ,  G06K2215/111 ,  H04N1/1906 ,  H04N1/1911

摘要： One invention aspect forms a mask and matrix of corresponding backups for values in the mask, checks when a mask value is not working, and replaces only that value with only a matching matrix entry. A second matrix of further backups is best formed. Another aspect forms a mask as a matrix of stacks of matching entries for mask positions; selects an entry for each position from the matching matrix stack; and prints using the selected entry at each position. Preferably the selecting includes rotating the stack; and applying to each entry a selection probability related to numerical weighting of printing elements; reflect firing-frequency limitation has higher authority than weights. Another aspect forms a mask as a matrix of stacks of matching entries for mask positions, and rotates each stack to select an entry for each position. Another aspect forms a mask and a matrix of stacks of backups; finds nonworking mask values and replaces such values with backups from a matching stack. Another aspect forms a seminal mask, tiles it to make a larger one with related properties, and injects noise to disrupt tiling-caused regularity and form a less-regular mask. Preferably the mask is cubical, each side a number of pixels or layers about equal to number of passes.

摘要翻译： 一个发明方面形成掩模中值的相应备份的掩码和矩阵，检查掩码值何时不起作用，并且仅用匹配的矩阵条目替换该值。 进一步备份的第二个矩阵最好形成。 另一方面形成掩模作为掩模位置的匹配条目的堆栈的矩阵; 从匹配矩阵堆栈中选择每个位置的条目; 并使用所选条目在每个位置进行打印。 优选地，选择包括旋转堆叠; 并且向每个条目应用与打印元件的数值加权相关的选择概率; 反射射频限制比权重更高。 另一方面形成掩模作为掩模位置的匹配条目的堆叠的矩阵，并且旋转每个堆栈以为每个位置选择条目。 另一方面形成了一个掩码和一堆备份的矩阵; 找到非工作掩码值，并使用匹配堆栈的备份替换此类值。 另一方面形成了一个精液掩模，将其拼贴成一个具有相关属性的较大的掩模，并注入噪声以破坏平铺引起的规律性并形成一个较不规则的掩模。 优选地，所述掩模是立方体的，每侧都有大约等于通过次数的多个像素或层。

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：EP0895410B1

公开(公告)日：2004-06-16

申请号：EP98305939.5

申请日：1998-07-27

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Shaked, Doron ,  Arad, Nur ,  Fitzhugh, Andrew ,  Sobel, Irwin

IPC分类号： H04N1/52 ,  H04N1/58

CPC分类号： H04N1/58

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.

公开(公告)号：EP0982932A3

公开(公告)日：2001-05-23

申请号：EP99305907.0

申请日：1999-07-26

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Shaked, Doron ,  Arad, Nur ,  Baharav, Izhak ,  Lin, Gian

IPC分类号： H04N1/52

CPC分类号： H04N1/52 ,  H04N1/54

摘要： A pixel color in an image can be represented by a dot color in a dot pattern as follows. A subset of a limited set of display colors is selected (102). The subset has N display colors that can render a solid color patch of the pixel color. The colors of the subset correspond to vertices of a simplex in the color space. The simplex has (N-1) dimensions. A point operation is then performed to select one of the vertices of the simplex and thereby select the dot color of the subset color corresponding to the selected vertex (104, 106, 108). Consequently, a solid patch of the pixel color can be rendered by a dot pattern having no more than N different colors. The dot pattern can be displayed by an imaging device (12, 14) such as an inkjet printer, which has a limited set of display colors.