公开(公告)号：US20160198065A1

公开(公告)日：2016-07-07

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: 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.