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Trellis dirty paper watermarking is an implement of watermarking with side information, which has very good performances. But the structure issue remains unclear, and how to choose a proper structure and reference pattern in terms of all the performance indexes is still a problem. In this paper, the performance indexes of the trellis dirty paper watermarking and its factors that affect the performances...
Semi-fragile watermarking which is robust to given operations and fragile to conscious operations, is a useful authentication technique for digital media. In this paper, a novel semi-fragile image watermarking algorithm that accepts gradient sharpening is proposed. In the proposed algorithm, based on the theory of gradient sharpening, the watermark is embedded in the space domain by modifying the...
Semi-fragile watermarking technique which aims to discriminate malicious manipulations from admissible manipulations, is drawing many attentions in image authentication. In this paper, a novel semi-fragile image watermarking algorithm that accepts Laplacian sharpening is proposed. In the proposed algorithm, based on the theory of Laplacian sharpening, the watermark is embedded in the space domain...
DCT is widely used in watermarking, but the effect of different coefficients on robustness and fidelity remains unclear. For example, there is only one DC coefficient, but many low frequency coefficients, so error correcting coding can be applied to improve the robustness of the low frequency coefficients, and in this situation, how about the robustness between a single DC coefficient and all the...
Multiple watermarking is an embranchment of digital watermarking, which has many desirable characteristics that common singular watermarking does not have, such as robustness to union attacks. But existing multiple watermarking methods have some inherent problems such as low validity and high complexity. In this paper, a novel multiple watermarking method based on spread transform is proposed. Cover...
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