Abstract: This paper puts forward a kind of robust watermarking algorithm based on block SVD, the hybrid system and balanced multiwavelet. To being embedded watermarking signal, it should make hybrid chaotic system to be scrambled and encrypted. Then the coverimage should be changed by cardbal2 multiwavelet. Low frequency sub-band is done 4×4 blocks, SVD handling and embedded according to embedded coefficients and equilibrium factor. The experimental results show that this algorithm has good invisibility and robustness.

Key words: hybrid chaotic, blocks singular value decomposition, balance multiwavelets, equilibrium factor, robust watermarking

摘要： 提出了一种基于复合混沌系统与平衡多小波、块SVD相结合的鲁棒水印算法。对待嵌入水印信号进行复合混沌置乱加密；对载体图像作一次cardbal2多小波变换；对低频子带进行4×4分块并做SVD处理，根据均衡因子和嵌入系数进行嵌入。实验结果表明算法有很好的不可见性和鲁棒性。

关键词: 复合混沌, 块奇异值分解, 平衡多小波, 均衡因子, 鲁棒水印