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:
Sep. 08, 2009
Filed:
Feb. 16, 2006
Wen-liang Hwang, Taipei, TW;
Jeng-nan Tzeng, Taipei, TW;
I-liang Chern, Taipei, TW;
Academia Sinica, Taipei, TW;
Abstract
According to an asymmetric watermarking technology, which is particularly resistant to projection attack, an original image is analyzed to obtain its watermarking space. The watermarking space is then divided to obtain two orthogonal subspaces g and h. An embedding key G, which is a matrix and which columns form bases of subspace g, is selected and a matrix H, HG=0 is calculated. Columns of matrix H form bases of subspace h. A detecting key D, which equals the sum D= G, wherein B is a matrix, is calculated, and a watermark w is obtained and embedded into the original image φto obtain a watermarked image φ=φ+Gw, wherein Dφ=mis not a 0 vector.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile