Based on this, the paper proposes a double watermarking algorithm based on DCT domain that the coexistence of robust and fragile digital watermarking can be achieved.

基于这个不变的数字特征，本文提出了种基于图像DCT域的鲁棒性水印和脆弱性水印共存的双水印算法。

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Finally, on the basis of studying single digital watermarking, proposes a double digital algorithm based on SVD and DWT.

最后，在研究单数字水印的基础上，提出了一种基于SVD和DWT的双数字水印算法。

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