A Grey-Level Image Watermarking Method based on Block DCT and Statistic Correlation Adjustment

C. Obimbo and J. Ni (Canada)


Watermarking, Computer Security, DCT, Correlation Coefficients.


The watermarking technology provides an ideal tool of copy and copyright protection. It relies on embedding a secret imperceptible signal, a watermark, into the host data in a way that it always remains presence. In this paper, we presented a new method of watermarking, which embeds a binary sequence into the DCT domain of a grey-level host image. The embedding procedure is carried out by slightly modifying the correlation coefficients of those middle frequency bands in the DCT blocks. Experiment results show that our algorithm is robust to certain types of attacks, such as the JPEG compression.

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