The Research Of Digtal Watermaking Based On Image Security

Digital watermarking technology that is the new emergence of cutting-edge research areas in recent years, has rapid development in the copyright protection of multimedia information and the integrity of the certification, has become a hot topic in the field of Multimedia information security. At the same time digital watermarking as a new anti-counterfeiting technology has become a trend. The paper has done the works about the digital image security as follow:Firstly, this paper present the discrete cosine transform domain digital watermarking technology and offer a discrete cosine transform domain digital watermarking algorithm with good robustness. The algorithm codes the watermark information to achieve watermark extraction error correction function, and selects embedded sub-diagrams combined with Logistic chaotic sequence of pseudo-random to enhance the security of the watermarking system. Experiments show that the algorithm has a better robustness on regular geometric attack.Secondly, this paper highlights the wavelet transform domain digital watermarking technology and presents a color image digital watermarking algorithm which resistance to printing and scanning. The algorithm transforms the image from RGB color space into the Lab color space which is device-independent. In the L component of Lab model, select the appropriate embedding points based on the size of the energy block, embed a watermark adaptively. Experimental results show that the proposed algorithm is robust not only to the printing and scanning but also to the conventional image processing.Finally, this paper presents a digital watermarking system prototype on the basis of the above algorithm.