Digital Image Watermarking Technique Based On Wavelet Transform

With rapid development of the computer and network, the spread and copy of digital products become more and more convenient. At the same time,information security and copyright protection have been a key problem. A potential method to solve this problem is to use watermarking.In this thesis, based on waveler transform, the digital watermarking is researched, the main contributions are as follows:Investigate the basic principles and characteristic of information hiding technique, introduced the research backgrounds, basic principles, application areas, and recent development of the digital watermarking technology.Analyze wavelet transform, lifting scheme and lifting factorization of 9/7 wavelet, then point out the advantages of using wavelet transform in digital watermarking.Put forward a new kind of watermarking schemes in DWT domain, which is superior to Wang's algorithm and Inoue's algorithm, we can inspect watermark without original image and original watermarking.Simulation results of three methods show that although image quality of our algorithm is lower, but is superior to a algorithm in DCT domain and Kundur's algorithm in resistance attacks of JPEG and JPEG2000.