Research On Digital Watermarking Algorithm Based On Genetic Algorithm And SVD

Because of the complexity of moden network environment and the transparency and ease of operation of multimedia digital products,all kinds of piracy,illegal tampering and malicious communication are becoming more and more easy to operate,which seriously endangers the security of multimedia information.Digital watermarking technology has become a research hot spot because it can solve the above problems.Singular matrices obtained by singular value decomposition have been widely used in digital watermarking algorithms because of their strong stability.But at present,most of these digital watermarking algorithms have some false alarm problems,and the fixed embedding factor can not simultaneously take into account invisibility and resist multiple external attacks.In this thesis,the problem of false alarm rate in singular value decomposition,and the fixed embedding factor can not simultaneously consider the invisibility and resistance to a variety of external attacks,have done the following aspects of the work.1.This thesis introduces the research background and present situation of digital watermarking technology,summarizes the basic watermark embedding and extraction models diagram of digital watermarking algorithm,sums up the application and typical algorithms of digital watermarking,analyzes the common attack methods,and expounds the evaluation criteria of the advantages and disadvantages of the digital watermarking algorithm from two aspects:invisibility and robustness.2.Aiming at the problem of false alarm rate based on SVD class digital watermarking algorithm,this thesis proposes a solution strategy by analyzing the definition and characteristics of SVD decomposition.The idea of this strategy is to embed the main components of the watennark information into the carrier image,instead of embedding the watermark directly and experiment on the Matlab platform.The experimental results show that the algorithm can effectively reduce the false alarm rate and verify the reliability of the algorithm.3.Aiming at the problem that the artificial control of embedding factors in most digital watermarking algorithms can not take into account the quality of watermark images and the ability to resist external attacks,a watermarking algorithm strategy based on genetic algorithm is proposed.The algorithm solves the above problems by automatically obtaining the optimal embedding factor instead of the artificial control of the embedding factor in the traditional algorithm.The experiment and contrast analysis on the Matlab platform show that the algorithm has strong resistance to various attacks and the image quality will not be affected.