Digital Image Watermarking Algorithm Based On Wavelet Transform

With the popularization of Internet and the development of multimedia techniques, digital media including text, image, graphics, digital audio and digital video etc., is widely used, accessing to multimedia data has become much easier day by day. However, it brings some problems such as information security, copyright protection and authentication. All these problems are becoming more and more urgent. Although traditional encryption can protect digital data while it is in transfer, but they can't be protected any longer when they are received and decrypted. And sometimes the encrypted data might attract some people to decrypt them. Digital watermark technology is an efficient complementary method of traditional encryption under the exoteric net-environment. It is a new technology that can protect the copyright and authenticate the origination. In recent years, digital watermark technology has been attracting more and more researchers and developed quickly. As an effective way of copyright protection, digital watermarking is becoming a hot point in multimedia and signal processing domain, and is also an important branch of the safe information research field.Wavelet analysis, also called multi-resolution analysis, a developmental discipline on the foundation of the Fourier analysis, has the deep theories meaning and extensive applications. It has generated strong impulse on the new technique application courses and the ancient natural courses. Currently, wavelet analysis is international deeply concerned leading edge realm of science and technology academic circles.In this thesis, firstly, we systematically analyzed the current watermarking developing status and basic theories of the digital...