The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 2004
Filed:
Mar. 11, 2002
Digital Verification Ltd., Petach Tikva, IL;
Abstract
A method for verifying authenticity of a certificate under test, wherein an authentic version of the certificate has a known watermark in a predetermined watermark region thereof. The method includes capturing an image of at least a portion of the watermark region of the certificate under test. A correlation is found between the image of the watermark region and the known watermark. Responsive to the correlation, a portion of the image of the watermark region is registered with the known watermark, and a range of intensity values in the registered portion of the image is measured. A vector is defined in a decision space, the vector having coordinates given by the range of the intensity values and by a value of the correlation between the image of the watermark region and the known watermark. The certificate under test is determined to be authentic if the vector falls within a predefined area of the decision space.