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Watermarking is a technique for hiding of data in a medium coverage so thatits presence is not detectable by a human eye and is recoverable only by theauthorized recipient. Two of the most important features of watermarked imageare transparency and robustness which are largely related to the security ofwatermarking algorithms. In this paper, an image watermarking scheme based onBCH error correction code in Discrete Cosine Transformation (DCT) domain isconsidered. Before embedding process, the watermark is encoded through BCHcoding. Then it is embedded into the Discrete Cosine Transformation (DCT)coefficients of cover image. In order to decrease embedding complexity andspeed up the process of finding the best position to insert a watermark signal,lookup table method is utilized. The key features of proposed method includethe reduction of time required in the process embedding of information,security and ability to correct the error caused by variety of attacks anddestructions as well. Watermarked image robustness has been investigatedagainst different kinds attacks and the simulation results indicate that theproposed algorithm outperforms the existing methods in terms ofimperceptibility, robustness and security.

An Efficient Digital Watermarking Algorithm Based on DCT and BCH Error Correcting Code