提出了基于混沌系统的静止图像脆弱性数字水印算法。
We put forward a fragile digital watermarking algorithm of still image according to the chaos system.
在方案二中，本文将方案一的方法进一步扩展到半脆弱性数字水印中。
The method in scheme one is expanded to semi-fragile watermarking in scheme two.
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。
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.
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