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:
Nov. 17, 2009
Filed:
Jul. 01, 2004
Chien-ju LI, Hsinchu, TW;
Guo-zua Wu, Hsinchu, TW;
Meng-han Tsai, Hsinchu, TW;
Kun-ta Wu, Hsinchu, TW;
Chien-Ju Li, Hsinchu, TW;
Guo-Zua Wu, Hsinchu, TW;
Meng-Han Tsai, Hsinchu, TW;
Kun-Ta Wu, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A watermark coding method and its recording medium utilize image interleaving and wavelet-based transformation to enhance the robustness of the image. The watermark series to be inserted is converted, encrypted, and modulated to increase the difficulty in decoding and restoring. Finally, the watermark is distributed and hidden in various frequency bands of the image in a frequency hopping way, generating a robust watermarked image. When used in a recording medium, side information produced during coding is recorded in the lead-in area of the recording medium to reduce the chances of illegal copying.