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:
Mar. 03, 2015
Filed:
Dec. 07, 2011
Edgar A. Bernal, Webster, NY (US);
Shen-ge Wang, Fairport, NY (US);
Robert P. Loce, Webster, NY (US);
Zhigang Fan, Webster, NY (US);
Edgar A. Bernal, Webster, NY (US);
Shen-ge Wang, Fairport, NY (US);
Robert P. Loce, Webster, NY (US);
Zhigang Fan, Webster, NY (US);
Xerox Corporation, Norwalk, CT (US);
Abstract
As set forth herein, computer-implemented methods and systems facilitate watermarking documents and/or images using 2generation stochastic halftoning. The watermark is used to spatially vary the gray level at which a frequency modulation-to-amplitude modulation transition occurs. The encoding algorithm uses as inputs a contone image and a watermark. The visibility of the watermark is controlled by the magnitude of the difference between the AM-to-FM transition threshold values.