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There has been an increase in broadcasting media since the begin of this century, because many techniques had been developed to solve this problem. Watermarking is the greatest bet from many researches around the world. Digital watermarks can be used by a lot of applications like: copyright protection, broadcast monitoring and owner identification. In this paper, the authors will show a classification of watermarks, propose a basic model for watermarking and explain some recent algorithms for image watermarking and their features, citing examples applicable to each category.
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