Digital Watermark Research Basing On Perception Model

The digital watermark technique have developed already for more than ten years, among them the picture numerical watermark application is the most extensive.This topic aims at above problems, passing various and thorough ways analytical digital watermark and perception modelin the picture the processing of application, the foundation in the DCT arithmetric, introduce a kind of according to detect technical digital watermark calculate way of module. It can confirm watermark whether existence, at the assistance of what doesn't need an original image. Then it can authenticate the copyright of the work. The method is mainly to divide the image to many blocks with the same length and width, making use of the analysis to veins and brightness of each block, to judge the child pieces that after embedding watermark whether easily result in the image distortion in child pieces, and give each block appropriate proportion to embedded the watermark data of different energy. Finally with the image amending function, to revise the image edge distortion after embedding watermark, we aim to hold maintenance the vision quality of the image. What chapter 4 describe is a withdraw method of digital watermark ,this method is the negative process that the digital watermark imbed.Chapter 5 experiment proves this way can realize the digital watermark imbed.Through various attack tests, the digital watermark imbed can be withdraw with the higher likeness degree.