Title: Implementation method of anti printing and scanning meaningful digital watermark with large capacity
Application Number: 200610131674 Application Date: 2006.11.29
Publication Number: 1960428 Publication Date: 2007.05.09
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04N1/32;G06T1/00
Applicant(s) Name: Jilin Univ. Address:
Inventor(s) Name: Wang Shuxun;Ge Yunxia;Nian Guijun
Attorney & Agent: weizheng ji
Abstract:
    The method comprises: 1) generating high capacity of digital watermarking signals 2) pre-processing the original image to be embedded with the watermark; 3) embedding watermark information; 4) processing the watermark image before extracting the watermark; 5) extracting the watermark; 6) enhancing the image watermark information. The invention features the following: 1) embedding binary image high capacity information that enhances the identifiability of watermark information; 2) having strong robustness of anti-print and anti-scanning that can be used in anti-fake of all certificates and prints; using Hausdorff-based distance geometric correction process, which can effectively correct all geometric attack to watermark signal in the print and scanning process such as rotation, scaling and translation.
Time: 9