Research On Robust Digital Watermark Technology For Image

The digital watermark is a science technology which along with the multimedia, the electronic government affairs, the electronic commerce security problem. At present the watermark mainly is uses in the copyright protection and the authenticating the integrity of content, the copyright protection request watermark has the very good robustness, can resist operations , provides the certificate for owner's copyright .For example picture issue, audio and video works legitimate using; The content integrity protection request watermark can changes very sensitive when the content is modified, like the frail watermark, applies much in the electronic commerce and the electronic government affairs. Because different application goal,the research thought and method are different. Firstly, we introduced the basic frame and research achievements now. Then according to robustness, analyzed the digital watermark characteristic and the influence robust factor, considered how enhanced the watermark capability of anti- attack in transmit, combine the HVS models and repeat embedding, we put forward a new watermark algorithm for static grew image in wavelet coefficient. Some different type of attacks on the algorithm which is presented in the paper are performed to test its robustness,invisibility and practicality.