KEYWORDS: Digital watermarking, Chaos, Filtering (signal processing), Digital filtering, Signal processing, Gaussian filters, Quantization, Feature extraction, Intellectual property, Binary data
Digital watermarking is a kind of technique that can be used for protecting and enforcing the intellectual property (IP)
rights of the digital media like the digital images containting in the transaction copyright. There are many kinds of digital
watermarking algorithms. However, existing digital watermarking algorithms are not robust enough against geometric
attacks and signal processing operations. In this paper, a robust watermarking algorithm based on chaos array in DCT
(discrete cosine transform)-domain for gray images is proposed. The algorithm provides an one-to-one method to extract
the watermark.Experimental results have proved that this new method has high accuracy and is highly robust against
geometric attacks, signal processing operations and geometric transformations. Furthermore, the one who have on idea of
the key can't find the position of the watermark embedded in. As a result, the watermark not easy to be modified, so this
scheme is secure and robust.
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