The Research Of Watermarking Based On Wavelet And Chaos

With the development of communication, computer and Internet technology, humans' lives have been changed a lot. Based on the technology of computer and network, the multimedia information exchanges provide a convenient way for using and spreading of digital produces. This make digital produces have more advantages then traditional produces. At the same time, multimedia information security problems became a pop international research question. The digital watermarking technology as a new information hiding technology, can prove the original data copyright and integrity through embedding a mass of cryptic information-watermarking in it, because watermarking can endure some attack actions, such as pirate and modification. In this dissertation, the main work is the research of digital watering technology. The contents have two parts as shown:(1) The summarizations of basic concepts, theories and main knowledge for the digital watermarking technology, wavelet analyze and chaos theory. With the introductions of the digital watermarking technology development, status and expectation, the research aspect of this dissertation has been proposed.(2) In this dissertation, proposed a non blind watermarking algorithm and a blind watermarking algorithm based on wavelet and chaos. In those algorithms, selected two value image with exact meaning as watermarking and used the method that proposed in this dissertation based on chaos sequence to mess it; Selected digital wavelet transform which has human visual system characteristic as the watermarking embedding domain, and considered the noise acceptable capability of wavelet coefficients; Used the same watermarking repetitious embedding technology as the watermarking embedding means; Used a method with rectify ability to enhance the exactness rate when do watermarking detection. In blind algorithm, the material watermarking embedding way has been provided, Using the noise acceptable capability of wavelet coefficients to confirm the reference value improved the watermarking embedding agility. At the same time, the reference value can be the secret key to protect the watermarking's security.