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IMAGE WATERMARKING: A SURVEY

Sirsendu Sarbavidya, Sunil Karforma

To provide ownership of media and to protect it from unwanted changes, encryption & control access techniques were used in earlier days. But, with the advancement of digital communication and easy availability of cheap recording and storing devices, the security of digital information is under threat. Any one can easily obtain, replicate and distribute digital image without any loss in quality. Therefore, we need to develop a system that can not only prevent unauthorized access of the content but also help to establish ownership rights, content authentication and prevent illegal replication. In order to successfully implement all these, watermarking is used globally. Watermarking is a technique for embedding additional data which is used for copyright protection and ownership identification. The embedded watermark should be robust enough to survive all sorts of attacks. This paper conducts a literature survey of existing & newly proposed watermarking techniques along with their potential application areas.