On The Key Technology And Application Of Color Image Blind Watermarking

With the rapid development of computer and the network telecommunication technology,the digital audio-visual products and other electronic publications dissemination and transactions become more and more convenient. However, the ensuing combat piracy was also rampant trend, which will damage music, movies, books and software publishing industry. The most copyright protection system uses password authentication techniques , but only the use of password and can not fully solve the problem of copyright protection. Digital watermarking has been studied and applied broadly now for more effectively protecting the intellectual property rights. Digital watermarking is to embed the copyright information and serial number into digital media in order to help identify copyright violators, and to report and prosecute pirates. Based on the existed works of digital watermarking, this thesis presents some effective algorithms of color image digital watermarking .The major works are as follows:1. Based on chaotic sequences, a new digital image scrambling algorithm is presented. The algorithm used Logistic mapping to scramble the digital image,in the algorithm using two different initial value of chaotic sequences at the same time to generate the odd-numbered bits and even-numbered bits.Then XOR operator is used to scramble the image, the simulating experimentation shows that the algorithm is simple, security highly,has a strong anti-attack capability, with good encryption effect.2. Based on chaotic system,human visual system (HVS) and lifting wavelet transformation (LWT), a blind watermarking of color digital image algorithm is Designed.The algorithm has high security because of using spread spectrum and Logistic chaotic to treatment the watermarking image,before it is embedded.Making use of feature of HVS, the watermarking image is embedded into the color image's low frequency component and middle frequency components of the three-component by different means,so the algorithm is both a good hidden effect and has a very strong robustness.The large amount of emulation experiment indicates that the algorithm is a good blind watermarking algorithm for the feasibility, effectiveness, safety and anti-attack capability.