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1. 发明授权

US09319556B2 Method and apparatus for authenticating printed documents that contains both dark and halftone text 有权
标题翻译：用于认证包含黑暗和半色调文本的打印文档的方法和装置
公开(公告)号：US09319556B2
公开(公告)日：2016-04-19
申请号：US13223298
申请日：2011-08-31
申请人： Xiaonong Zhan , Wei Ming , Songyang Yu
发明人： Xiaonong Zhan , Wei Ming , Songyang Yu
IPC分类号： G06K15/00 , H04N1/40 , G06K9/34 , G06K9/48 , H04N1/32 , H04N1/403 , H04N1/44
CPC分类号： H04N1/403 , H04N1/32101 , H04N1/4446 , H04N2201/3226 , H04N2201/3235 , H04N2201/3269 , H04N2201/3271
摘要： A document authentication method determines the authenticity of a target hardcopy document, which purports to be a true copy of an original hardcopy document. The method compares a binarized image of the target document with a binarized image of the original document which has been stored in a storage device. The image of the original document is generated by binarizing a scanned grayscale image of the original document. Halftone and non-halftone text areas in the grayscale image area separated, and the two types of text are separately binarized. The non-halftone text areas are then down-sampled. During authenticating, a scanned grayscale image of the target document is binarized by separating halftone and non-halftone text areas and binarizing them separately, and then down-sampling the non-halftone text areas. The binarized images of the target document and the original document are compared to determine the authenticity of the target document.
摘要翻译：文档认证方法确定目标硬拷贝文档的真实性，其目的在于是原始硬拷贝文档的真实副本。该方法将目标文档的二值化图像与存储在存储装置中的原始文档的二值化图像进行比较。原始文档的图像是通过对原始文档的扫描灰度图像进行二值化生成的。灰度图像区域中的半色调和非半色调文本区域分开，两种类型的文本被分开二进制化。非半色调文本区域然后被下采样。在认证过程中，目标文档的扫描灰度图像通过分离半色调和非半色调文本区域进行二进制化，并将它们分开二值化，然后对非半色调文本区域进行下采样。比较目标文档和原始文档的二值化图像，以确定目标文档的真实性。

2. 发明授权

US08864033B2 Robust decoding of color barcode printed with extremely small data cells 有权
标题翻译：用极小数据单元打印的彩色条形码的强大解码
公开(公告)号：US08864033B2
公开(公告)日：2014-10-21
申请号：US13687921
申请日：2012-11-28
申请人： Yibin Tian , Xiaonong Zhan , Wei Ming
发明人： Yibin Tian , Xiaonong Zhan , Wei Ming
IPC分类号： G06K19/08 , G06K7/14 , G06K19/06
CPC分类号： G06K7/1417 , G06K7/1443 , G06K7/1447 , G06K7/1456 , G06K2019/06225
摘要： A method for decoding digital data in a color barcode having a plurality of data cells, including the steps of: scanning the color barcode of the hardcopy document, separating color image of the color barcode into print primary color planes, computing peaks of each print primary color plane, projecting, for at least one of the print primary color planes, the data cells along a horizontal direction and a vertical direction at the peaks of the at least one of the primary color planes in each direction which represent data cell center locations respectively, and creating a grid where each of its intersection is a respective data cell center location, assigning a color to each grid intersection which corresponds to a respective data cell by examining values of the print primary color planes at such location, and decoding digital data from the data cells based on the respective color assigned to each data cell.
摘要翻译：一种用于对具有多个数据单元的彩色条形码中的数字数据进行解码的方法，包括以下步骤：扫描硬拷贝文档的彩色条形码，将彩色条形码的彩色图像分离成打印原色面，计算每个打印主图像的峰值彩色平面，用于至少一个打印原色面，沿着水平方向的数据单元和在每个方向上的至少一个原色面的峰值处的垂直方向分别表示数据单元中心位置并且创建一个网格，其中每个交集是相应的数据单元中心位置，通过检查在这样的位置处的打印原色面的值，将对应于相应数据单元的每个格子交点分配颜色，基于分配给每个数据单元的相应颜色的数据单元。

3. 发明申请

US20140144991A1 ROBUST DECODING OF COLOR BARCODE PRINTED WITH EXTREMELY SMALL DATA CELLS 有权
标题翻译：用极其小的数据细胞印刷的彩色条纹的稳健的解码
公开(公告)号：US20140144991A1
公开(公告)日：2014-05-29
申请号：US13687921
申请日：2012-11-28
申请人： Yibin Tian , Xiaonong Zhan , Wei Ming
发明人： Yibin Tian , Xiaonong Zhan , Wei Ming
IPC分类号： G06K7/10
CPC分类号： G06K7/1417 , G06K7/1443 , G06K7/1447 , G06K7/1456 , G06K2019/06225
摘要： A method for decoding digital data in a color barcode having a plurality of data cells, including the steps of: scanning the color barcode of the hardcopy document, separating color image of the color barcode into print primary color planes, computing peaks of each print primary color plane, projecting, for at least one of the print primary color planes, the data cells along a horizontal direction and a vertical direction at the peaks of the at least one of the primary color planes in each direction which represent data cell center locations respectively, and creating a grid where each of its intersection is a respective data cell center location, assigning a color to each grid intersection which corresponds to a respective data cell by examining values of the print primary color planes at such location, and decoding digital data from the data cells based on the respective color assigned to each data cell.
摘要翻译：一种用于对具有多个数据单元的彩色条形码中的数字数据进行解码的方法，包括以下步骤：扫描硬拷贝文档的彩色条形码，将彩色条形码的彩色图像分离成打印原色面，计算每个打印主图像的峰值彩色平面，用于至少一个打印原色面，沿着水平方向的数据单元和在每个方向上的至少一个原色面的峰值处的垂直方向分别表示数据单元中心位置并且创建一个网格，其中每个交集是相应的数据单元中心位置，通过检查在这样的位置处的打印原色面的值，将对应于相应数据单元的每个格子交点分配颜色，基于分配给每个数据单元的相应颜色的数据单元。

4. 发明授权

US08331670B2 Method of detection document alteration by comparing characters using shape features of characters 有权
标题翻译：通过使用字符的形状特征比较字符来检测文档的方法
公开(公告)号：US08331670B2
公开(公告)日：2012-12-11
申请号：US13053618
申请日：2011-03-22
申请人： Songyang Yu , Wei Ming
发明人： Songyang Yu , Wei Ming
IPC分类号： G06K9/34
CPC分类号： G06T7/001 , G06K9/03 , G06K9/3241 , G06K9/34 , G06K9/6215 , G06K2209/01 , G06T2207/30176
摘要： A document alteration detection method compares a target image with an original image by comparing character shape features without actually recognizing the characters. Bounding boxes for the characters are generated for both images, each enclosing one or more connected groups of pixels of one character. The bounding boxes in the original and target images are matched into pairs. Addition and deletion of text is detected if a bounding box in one image does not have a matching one in the other image. Each pair of bounding boxes is processed to compare their shape features. The shape features include the Euler numbers of the characters, the aspect ratio of the bounding boxes, the pixel density of the bounding boxes, and the Hausdorff distance between the two characters. The two characters are determined to be the same or different based on the shape feature comparisons.
摘要翻译：文档变更检测方法通过比较字符形状特征而不实际识别字符来比较目标图像与原始图像。为两个图像生成字符的边框，每个都包含一个或多个连接的一个字符的像素组。原始和目标图像中的边界框匹配成对。如果一个图像中的边界框在另一个图像中没有匹配的一个，检测到文本的添加和删除。处理每对边界框以比较其形状特征。形状特征包括字母的欧拉数，边界框的宽高比，边界框的像素密度以及两个字符之间的Hausdorff距离。基于形状特征比较，两个字符被确定为相同或不同。

5. 发明授权

US08947736B2 Method for binarizing scanned document images containing gray or light colored text printed with halftone pattern 有权
标题翻译：用于将扫描的文档图像二进制化的方法，其中包含以半色调图案打印的灰色或浅色文本
公开(公告)号：US08947736B2
公开(公告)日：2015-02-03
申请号：US12946801
申请日：2010-11-15
申请人： Songyang Yu , Wei Ming
发明人： Songyang Yu , Wei Ming
IPC分类号： G06K15/02 , H04N1/405 , H04N1/407 , H04N1/409 , H04N1/00 , H04N1/04 , G06K9/34 , H04N1/40
CPC分类号： H04N1/40062 , H04N1/405
摘要： A method for binarizing a scanned document images containing gray or light colored text printed with halftone patterns. The document image is initially binarized and connected image components are extracted from the initial binary image as text characters. Each text character is classified as either a halftone text character or a non-halftone text character based on an analysis of its topology features. The topology features may be the Euler number of the text character; a text character with a Euler number below −2 is classified as halftone text. The gray-scale document image is then divided into halftone text regions containing only halftone text characters and non-halftone text regions. Each region is binarized using its own pixel value statistics. This eliminates the influence of black text on the threshold values for binarizing halftone text. The binary maps of the regions are combined to generate the final binary map.
摘要翻译：用于将包含灰色或浅色文本的扫描文档图像二进制化的方法，印刷有半色调图案。文档图像最初被二进制化，并且将连接的图像分量从初始二进制图像提取为文本字符。基于其拓扑特征的分析，每个文本字符被分类为半色调文本字符或非半色调文本字符。拓扑特征可以是文本字符的欧拉数; 欧拉数低于-2的文本字符被分类为半色调文本。然后将灰度文档图像分成仅包含半色调文本字符和非半色调文本区域的半色调文本区域。每个区域都使用其自己的像素值统计信息进行二值化。这消除了黑色文本对二值化半色调文本的阈值的影响。组合这些区域的二进制图以生成最终的二进制图。

6. 发明授权

US08430301B2 Document authentication using hierarchical barcode stamps to detect alterations of barcode 有权
标题翻译：使用分层条形码邮票进行文件验证，以检测条形码的更改
公开(公告)号：US08430301B2
公开(公告)日：2013-04-30
申请号：US12624407
申请日：2009-11-23
申请人： Yibin Tian , Wei Ming
发明人： Yibin Tian , Wei Ming
IPC分类号： G06F17/00 , G06F3/12 , G06K7/10 , G06K9/00 , G05B19/00 , H04L9/32
CPC分类号： G06K19/14 , G06F2221/2121 , G06F2221/2145 , G06F2221/2151 , G06F2221/2153
摘要： A method of generating a self-authenticating printed document and authenticating the printed document. The back side of the printed document contains 2d barcode which encode extracted features of the document content. The features are hashed into a hash code, converted to a barcode stamp element, and transformed into a hierarchical barcode stamp by repeating the stamp element. The hierarchical barcode stamp is printed as a gray background pattern on the front side of the same sheet of printed document. To authenticate the printed document, the barcodes on the back side are read to extract the document features. The features are hashed into a hash code and compared to the hash code extracted from the hierarchical barcode stamp on the front side of the document to detect any alterations of the back side barcodes. Further, the document features extracted from the front and back sides of the document are compared.
摘要翻译：一种生成自我认证的打印文档并认证打印文档的方法。打印文档的背面包含编码文档内容的提取特征的2d条形码。将特征散列成哈希码，转换成条形码印记元素，并通过重复印记元素转换成分层条形码印记。分层条形码邮票在同一张印刷文件的正面打印为灰色背景图案。要验证打印的文档，读取背面的条形码以提取文档特征。这些特征被散列成哈希码，并与从文档正面的分层条形码印记提取的哈希码进行比较，以检测背面条形码的任何改变。此外，比较从文档的正面和背面提取的文档特征。

7. 发明授权

US08144361B2 Creation and placement of two-dimensional barcode stamps on printed documents for storing authentication information 有权
标题翻译：在印刷文件上创建和放置二维条形码图像以存储认证信息
公开(公告)号：US08144361B2
公开(公告)日：2012-03-27
申请号：US12050701
申请日：2008-03-18
申请人： Wei Ming , Maria Qian Zhao
发明人： Wei Ming , Maria Qian Zhao
IPC分类号： G06K15/00
CPC分类号： G06K9/00449 , G07D7/0043
摘要： A document authenticating method is disclosed by which numerous small-sized two-dimensional barcode stamps are generated and placed in a distributed manner on a printed document. The small-sized barcode stamps collectively encode the content of the document to be used for document authentication. In one example, the stamp size is about ¼ by ¼ inches or less and the tile size for the stamps is 4 by 4 pixels at a resolution of 400 dpi. The document is segmented into segments each containing a paragraph or a line of text. For each segment, a set of barcode stamps encoding the authentication data for the segment is placed in the vicinity of the segment. They may be placed in the empty space in the last line of each paragraph, in the empty space between adjacent paragraphs, or at the beginning or end of each line.
摘要翻译：公开了一种文件认证方法，其中生成大量的小尺寸二维条形码邮票并以分布的方式放置在打印文档上。小尺寸条形码邮票集中编码要用于文件认证的文档的内容。在一个示例中，邮票大小约为1/4英寸或更小，邮票的尺寸为400 dpi的分辨率为4 x 4像素。文档被分割成段，每个段包含一段或一行文本。对于每个段，将编码该段的认证数据的一组条形码标记放置在段的附近。它们可以放置在每段最后一行的空白处，相邻段落之间的空白空间，或每行开头或末尾。

8. 发明申请

US20110149348A1 DETERMINING DOCUMENT AUTHENTICITY IN A CLOSED-LOOP PROCESS 有权
标题翻译：确定封闭循环过程中的文档认证
公开(公告)号：US20110149348A1
公开(公告)日：2011-06-23
申请号：US13039570
申请日：2011-03-03
申请人： Maria Qian Zhao , Wei Ming
发明人： Maria Qian Zhao , Wei Ming
IPC分类号： G06K15/00
CPC分类号： H04N1/32208 , G06K9/6202 , G06T1/0042 , G06T1/0078 , G06T2201/0051 , G06T2201/0061 , G06T2201/0083 , H04N1/32203 , H04N1/32293 , H04N1/32325 , H04N2201/3233 , H04N2201/3235 , H04N2201/3269 , H04N2201/3271
摘要： A document authentication method uses a watermark added in a printed document to detection possible alterations made to the document after it was printed. First, a visible watermark in the form of a dot pattern is overlapped with an original digital image. The watermarked image is printed out as a halftone image at a first resolution. The watermark in the printed document appears as a light gray shade. Later, the printed document is scanned back using a grayscale scan at a resolution higher than the first resolution. In the scanned image, altered areas would appear flat (lacking intensity variation) whereas unaltered areas will have relatively large density variations due to the watermark dots and the fact that the image was halftone printed at a lower resolution. Alternations are detected by identifying flat areas within the image using a combination of flat block detection and a multiple thresholds method.
摘要翻译：文档认证方法使用在打印文档中添加的水印来检测在打印文档之后对文档进行的可能的改变。首先，点图案形式的可见水印与原始数字图像重叠。水印图像以第一分辨率作为半色调图像打印出来。打印文档中的水印显示为浅灰色阴影。之后，使用灰度扫描以高于第一分辨率的分辨率扫描打印的文档。在扫描图像中，改变的区域将显得平坦（缺少强度变化），而未改变的区域将由于水印点而具有相对较大的密度变化，以及图像以较低分辨率打印的事实。通过使用平面块检测和多阈值方法的组合来识别图像内的平坦区域来检测交替。

9. 发明申请

US20100157318A1 CREATION AND PLACEMENT OF TWO-DIMENSIONAL BARCODE STAMPS ON PRINTED DOCUMENTS FOR STORING AUTHENTICATION INFORMATION 有权
标题翻译：用于存储认证信息的打印文件上的二维条形码的创建和放置
公开(公告)号：US20100157318A1
公开(公告)日：2010-06-24
申请号：US12338945
申请日：2008-12-18
申请人： Wei Ming
发明人： Wei Ming
IPC分类号： G06F3/12
CPC分类号： G07D7/202 , G07D7/0043
摘要： A document authenticating method is disclosed by which a plurality of two-dimensional barcode stamps are generated and printed on a back side of the document forming a pre-defined special pattern. The barcode stamps collectively encode the content of the document to be used for document authentication. Each barcode stamp encodes linking information indicating the position of the next barcode stamp. An index barcode may be printed on the front side of the document which encodes the position information for all of the barcode stamps on the back side.
摘要翻译：公开了一种文件认证方法，通过该文件认证方法生成多个二维条形码标记并将其打印在形成预定义特殊图案的文档的背面上。条形码标签共同编码要用于文件认证的文档的内容。每个条形码标记编码指示下一个条形码邮票的位置的链接信息。索引条形码可以打印在文档的正面，该文本编码位于背面的所有条形码邮票的位置信息。

10. 发明申请

US20090238626A1 CREATION AND PLACEMENT OF TWO-DIMENSIONAL BARCODE STAMPS ON PRINTED DOCUMENTS FOR STORING AUTHENTICATION INFORMATION 审中-公开
标题翻译：用于存储认证信息的打印文件上的二维条形码的创建和放置
公开(公告)号：US20090238626A1
公开(公告)日：2009-09-24
申请号：US12050718
申请日：2008-03-18
申请人： Wei Ming , Maria Qian Zhao
发明人： Wei Ming , Maria Qian Zhao
IPC分类号： B41J11/44
CPC分类号： G07D7/0043
摘要： A document authenticating method is disclosed by which numerous small-sized two-dimensional barcode stamps are generated and placed in a distributed manner on a printed document. The small-sized barcode stamps collectively encode the content of the document to be used for document authentication. In one example, the stamp size is 1 cm by 1 cm and the tile size for the stamps is 4 by 4 pixels at a resolution of 400 dpi. A total of approximately 80 such small barcode stamps are placed on the page to form a pattern that resembles a border on one or more sides of the page. In one particular example, the stamps are placed on all four sides of the page to form a frame. Such a stamp layout minimizes undesirable visual effect and can create a decorative effect. Small-sized stamps also allow reduced tile sizes and increased information density.
摘要翻译：公开了一种文件认证方法，其中生成大量的小尺寸二维条形码邮票并以分布的方式放置在打印文档上。小尺寸条形码邮票集中编码要用于文件认证的文档的内容。在一个示例中，邮票尺寸为1cm×1cm，邮票的尺寸为4×4像素，分辨率为400dpi。总共约80个这样的小型条形码邮票被放置在页面上以形成类似于页面的一个或多个边上的边框的图案。在一个特定示例中，邮票被放置在页面的所有四个侧面上以形成框架。这样的邮票布局使不期望的视觉效果最小化并且可以产生装饰效果。小尺寸邮票还可以减少瓷砖尺寸和增加信息密度。

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