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A combination of DCT-based and SVD-based watermarking scheme

Digital watermark has been proposed as a solution to the problem of copyright protection of multimedia documents in networked environments. There are two important issues that watermarking algorithms need to address. First, watermarking schemes are required to provide trustworthy evidence for protecting rightful ownership. Second, good watermarking schemes should satisfy the requirement of robustness and resist distortions due to common image manipulations (such as filtering, compression, cropping, rotation, etc.). In this paper, we propose a new watermarking algorithm which combines both merits of the algorithm based on discrete cosine transform (DCT) and the algorithm based on singular value decomposition (SVD), experimental results show that the new watermarking scheme is more robust than the SVD method.