Researching On Watermarking Algorithm Of Image Resistance To Compressing

As an important technique of protecting copyright,digital watermarking wodely get the cocern of industry field and scientist.Currently it have achieved some results. In order to save network bandwidth and storage resources,Image compression is ineviable.And Image impression greatly impresses the digital watermark.Compressed domain watermarking technique for how to improve the watermark to withstand compression on the performance of the watermark technology development is of important significance.Nowadays,compressed domain watermarking technology research is still in the initial stage and that there are still a lot of problems. such as algorithm is less,combining with other technique is not sufficient,considering little about human visual system and so on.As a result of these problems, the study on the subject is very important.In this paper,besides researching on the image digital watermarking and image compression technology in-depth,the thesis has put forward a method to embed a robust and a fragile watermark in the compression domain of the image.The robust watermark can offer the copyright protection to the image,while the fragile for geometric attacks and other common modify method. and the algorithm is based on JPEG Compression technology design. This experiment proved that coexistence of two watermarking algorithm is feasible.