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Digital Watermarking: An Indirect Approach

The explosive growth of Internet has resulted into ease of access of databases, around the world. To deal with piracy of copyrighted digital content, is turning out to be a serious problem. Embedding of a watermark signal is an interesting application field in the copyright protection of multimedia signals like images, sounds, movies etc [1]. Digital watermarking is a mechanism for copyright protection of digital media by embedding information identifying the owner in the data. In this paper, we have proposed a watermarking scheme on an image. In this method the watermark is indirectly embedded on the image. DCT concepts are used for implementing the scheme. To check the authentication of the image the watermark is recovered from the image using IDCT [2]. If the recovered watermark is correct then we say that the image is authentic else it is pirated. The program is written using Matlab.