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:
Jan. 30, 2007
Filed:
Nov. 26, 2003
Geoffrey B. Rhoads, West Linn, OR (US);
Ammon E. Gustafson, Beaverton, OR (US);
Geoffrey B. Rhoads, West Linn, OR (US);
Ammon E. Gustafson, Beaverton, OR (US);
Digimarc Corporation, Beaverton, OR (US);
Abstract
A fragile watermark is embedded in a document. The fragile watermark provides enhance security. In one implementation, a method is provided for embedding information in an image so that the image will have different information when a scanning or printing process reproduces the image. The method includes embedding digital information in an image; printing the embedded digital information and the image to produce a original printed image; scanning the original printed image to obtain a digital image of the embedded information and the image; determining the signal strength of the original image; and comparing the signal strength of a printed image with the signal strength of the original printed image to determine whether or not the printed image is a copy of the original printed image.