一种随机选取嵌入位置的DWT域盲水印

A DWT Based on Watermarking Algorithm by Randomly Selecting Embedding Positions

提出了一种基于离散小波变换域的盲水印算法.水印嵌入前,利用随机的状态对水印图像进行置乱.对载体图像进行离散小波变换后,利用随机状态在分解后的低频子带中量化系数的思想随机地嵌入水印信息.由于置乱和选取的位置具有随机性,所以该算法有效地增加了攻击者提取水印的难度,提高了算法的安全性.仿真结果表明,该算法具有较强的鲁棒性,可以抵抗诸如噪声、压缩、几何裁剪以及中值滤波等常见的图像攻击.

A blind watermarking algorithm based on discrete wavelet transform （DWT） was proposed. Before embedding, it scrambles the watermark by random state, then chooses the embedding position randomly in the wavelet low-frequency sub-band of the cover image according to the watermark, then embeds the watermark image with the quantization thought. Since using secret keys that make the embedding positions change randomly, it greatly enhances the security of the watermark. The simulation result shows that this algorithm is robust to common watermarking attacks.