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Cooperative information embedding deals with the problem of embedding unperceived information into some cover signal by different users or partners, cooperatively. It models applications in which embedded signals, or watermarks, transmitted over wireless networks need to be reinforced in order to withstand channel impairments. In cooperative information embedding, each embedder that can reinforce the embedded signal may or may not know the original cover signal. In this paper, the authors concentrate on the two user cases: an initial embedder and an assisting embedder or helper collaborates to embed some watermark into given digital media content which is transmitted over a wireless network.
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