Title: Method for embedding visible and invisible dual water print in digital image
Application Number: 03132640 Application Date: 2003.09.27
Publication Number: 1529299 Publication Date: 2004.09.15
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09C5/00
Applicant(s) Name: Harbin Polytechnical Univ. Address: 150001
Inventor(s) Name: Lu Zheming, Wu Haotian
Attorney & Agent: zhu hengxiao
Abstract:
     In the invention, digital image is decomposed by using discrete cosine transform (DCT) or wavelet transform. Digital processing technique embeds visible watermark and invisible watermark to domain of DCT or wavelet transform. Thus, digital image with watermark being embedded is obtained through DCT or wavelet transform. With visible water mark and invisible water mark being embedded, the embedded visible water mark is not easy to be removed, as well as does not cause distortion of original image quality and plays function of copyright declare; the embedded invisible water mark influences little quality of original image, possesses strong robustness from conventional attacks and plays function of copyright protection.
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