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As for the ensurement of copyright protection of the cover image and the watermark, the authors propose a DWT based dual watermarking technique in which blind and non-blind algorithms are used. The binary image and the mid-frequency coefficients of the cover image are used to modify the DWT coefficients of the primary watermark. As some features are embedded in the watermark, the security is increased and it ensures the protection of watermark from any copy attack.
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