双重变换域和水印划分策略的鲁棒盲水印方案

提出一种基于DWT和DCT域相结合的数字水印算法。利用Arnold变换对水印进行置乱，消除像素的空间相关性，增强水印图像抗剪切等操作的鲁棒性。将水印和载体图像分为两部分，结合DCT和DWT的特性，将一部分水印自适应量化嵌入到DCT视觉容量最大的DC系数上，另一部分自适应嵌入到DWT的中频子带中，有效地解决了水印的容量问题，并提高水印的鲁棒性和不可见性。实验证明该算法对JEPG压缩、几何剪切、滤波、叠加噪声等攻击均具有较好的鲁棒性。

Watermarking scheme of dual transform domains and watermarking segment

A meaningful digital watermarking algorithm based on combination of DCT and DWT is proposed.Using Arnold transform to make watermarking chaos and eliminate pixel spatial correlation in order to enhance watermarking’s robustness of shear.The choas are cut into two pieces.Combining the characteristics of DWT and DCT,one piece is embedded into the biggest DC coefficient in DCT visual capacity by adaptive quantization,the other is embedded into DWT sub-band adaptively,which can solve the capacity of the watermarking problem and improve watermarking robustness and invisibility.Experiments show that the algorithm has better robustness with JEPG compression,shear geometry,filtering,noise superimposed attacks.