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This paper proposes the software watermarking algorithm based on Chinese remainder theorem, and introduces the authentication center to certify the watermark, to solve the problem that equation re-sorting algorithm are easily attacked by the random re-sequencing technology. The algorithm further disposals the sequence obtained, the selected divisor sequence and the multiple to generate the key, which...
A more efficient robust watermarking algorithm based on DCT is proposed in this paper. The strength parameter of watermark in some approaches proposed is determined by experiments, we aim at establishing a mathematical model for hiding data in host image. By modifying the relationships between the selected middle-frequency coefficients and standard variance of DCT coefficients, watermark is embedded...
How to select the finite ridgelet transform (FRIT) coefficients which were suitable to embed watermark data was an interesting problem. Digital watermarking algorithms in FRIT domain were accomplished by modulating the transform coefficients, which represented the most energetic direction of an image. However, these coefficients which were the most suitable for embedding watermark were short of study...
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