Research On Digital Watermarking Technology Of Picture Based On Chaotic Sequences Spread Spectrum And Independent Component Analysis

Digital watermarking has been proposed as a new information hiding technique for the information security, intellectual property and certification enforcement of digital media, it is a new method to protect copyright by embedding the secret information into the open multimedia data, and has become a very active research hotspots in security fields.Independent Component Analysis (ICA) is a method of signal processing and data analysis developed in the research of blind processing. By the approach of ICA, even without any information of the source signals and the coefficients of transmission channel, people can recover or extract the source signals only from the observations according to the stochastic properties of the input signals. It is an active research of processing present. It has lots of applications in speech signal processing, array signal processing, biological and medical signal processing, mobile communication, image processing, and noise eliminating.To improve the robust of watermarking, the thesis focuses on digital image technology based on chaotic sequences spread spectrum and ICA. The thesis is composed of following parts:Firstly, the thesis introduces digital watermarking, including the research background, present situation, application domain, classification, characteristic, research hotspots, future view, evaluation target, investigation development.Secondly, a kind of image digital watermarking algorithm is proposed in this paper, which is based on chaotic sequence spread spectrum and Fast Independent Component Analysis (Fast ICA) in DCT domain. The system model, inserting algorithm, extract algorithm, experiment research, experiment data was got. The results of experiments demonstrate: the algorithm has a good robustness against several attacks.Thirdly, a kind of image digital watermarking algorithm is proposed in this paper, which is based on chaotic sequence spread spectrum and Fast ICA in DWT domain. The system model, inserting algorithm, extract algorithm, experiment research, experiment data was got. The results of experiments demonstrate: the algorithm has a better robustness against several attacks, and has a faster speeding.Fourthly, a kind of image digital watermarking algorithm is proposed in this paper, which is based on chaotic sequence spread spectrum, Fast ICA and wavelet tree in DWT domain. The results of experiments demonstrate: the algorithm has a good robustness against several attacks, and has a fast speeding.Finally, the thesis summarizes the to-be resolved problems, and the emphases of further research.