Digital Image Watermarking and Compression

Abstract

The growth of networked multimedia data such as images has complicated for authentication, copyright protection, broadcasting and integrity. Digital image watermarking is effective approach to distribute picture over the internet with privacy. Image compression is also needed to transmit over the Word Wide Web. This paper is aimed to develop the digital image watermarking and compression system. The output of the system displays whether the watermark can be detected or not. An effective watermark must withstand image compression, because images placed on the Internet or in databases are almost always compressed– sometimes to a very low data rate. Since compression tends to weaken a watermark in an image, it is important to find ways to maximize the amount of watermark that remains in the image after compression. Common image adaptive watermarks operate in the transform domain (DCT); the same domains are also used for popular image compression techniques.