Research Of Digital Image Watermarking Techniques

Digital watermarking technology hide the information in the image, the hidden secrets of digital image information can clearly indicate the copyright of the owner. Therefore, digital watermarking technology can effectively solve the problem of image copyright authentication in network.The article complete the color image copyright protection based on gray image watermarking algorithm.It is very important to extract a representative of the copyright holder of special significance with copyright protection in the digital image, so the application of digital watermarking technology attract wider and more popular attention.Base on the deeply study of the characteristics of watermarking technology and its classification and the need to meet the specific application such as robustness, transparency requirements as well as the analysis of the advantages and disadvantages of each type of watermark, we image-based singular value decomposition and wavelet transform of the watermarking algorithm in this paper. As well as a quaternion-based color image watermarking algorithm.In order to improve the security of watermarking algorithm, both algorithms are applied in the image Hash scrambling the watermark image preprocessing. Experimental results show that the two watermarking algorithms have good performance and can withstand some attacks, and have good robustness.