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. 28, 2003
Filed:
Jul. 28, 2000
Liehua Xie, Herndon, VA (US);
Arianne Michelle Lewis, Chestnut Hill, MA (US);
Evert Basch, Stow, MA (US);
Gonzalo Arce, Wilmington, DE (US);
Verizon Laboratories Inc., Waltham, MA (US);
Abstract
A system ( ) for watermarking digital data includes a watermark etching subsystem ( ) and a watermark extraction subsystem ( ). The watermark etching subsystem ( ) obtains a matrix of digital data values, selects windows including a plurality of data values from the matrix, specifies a parameter that indicates an acceptable amount of variation in the data values, and etches watermark bits in each window of data values using the specified parameter. The watermark extraction subsystem ( ) obtains a matrix of digital data values containing an etched watermark, selects windows comprising a plurality of data values from the matrix, and extracts watermark bits from each window of data values using the specified parameter.