一种复合型自适应数字水印算法

提出一种同时嵌入鲁棒性水印和易损性水印的复合型数字水印算法。其中鲁棒性水印的算法，利用图像小波系数的零树结构，基于零树小波编码，构造出重要系数小波树，将水印信息自适应地以不同强度嵌入载体图像的合适位置。实验结果表明，本算法在用于版权认证的同时还能对篡改进行有效的检测，具有较好的双重保护性能。

An algorithm of compound adaptive digital watermarking

Embedding robust watermark and fragile watermark in one image simultaneously, an algorithm of compound, adaptive digital watermarking was presented. The strength of robust watermark and the places to insert the watermark were adaptively determined by the significant coefficients wavelet tree (SCWT) based on the EZW(Embedded Zerotree Wavelets) coding model. Simulation results show that the algorithm managed to convey ownership and verify content integrity.