公开(公告)号：US09596378B2

公开(公告)日：2017-03-14

申请号：US15071623

申请日：2016-03-16

Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

Inventor： Xiaonong Zhan ,  Wei Ming ,  Songyang Yu

IPC: G06K9/00 ,  G06K9/34 ,  H04N1/40 ,  G06F3/12 ,  G06K15/00 ,  H04N1/403 ,  H04N1/44 ,  H04N1/32

CPC classification number: H04N1/403 ,  H04N1/32101 ,  H04N1/4446 ,  H04N2201/3226 ,  H04N2201/3235 ,  H04N2201/3269 ,  H04N2201/3271

Abstract: 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.

Abstract translation: 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。