SVD Based Digital Watermarking Algorithm

The development of multimedia and network brings forward a serious challenge to copyright protection of digital media. Digital watermarking embeds hidden messages within digital media such as text,image,video and audio to protect copyright.The hidden messages may be copyright information or secret messages.This dissertation introduces the development of digital watermarking technology to study the status of its application, to explore the digital watermark typical transformation, a new SVD-based digital image watermarking algorithm. At present, many algorithms need the original carrier image with the participation of non-blind detection technology, which in practical application of copyright protection has been limited. This watermark extracted using correlation detection, without the participation of the original carrier image to achieve the blind watermark detection.This algorithm splits the original image to blockes and do SVD transform,According to two different values of watermark image,two random sequence is embeded into singular values of every block. Compared with the conventional digital watermarking schemes, the scheme increases watermark securityThe theme gives the experiment of the algorithm on Matlab,and it shows that the algorithm can guarantee the unperceivability and transparency of the digital image. Experimental results demonstrate that the watermark robust against common signal processing.