基于DCT和混沌的双重图像水印算法

Dual Image Watermarking Algorithm Based on DCT and Chaos

为实现图像版权和完整性认证,提出一种基于DCT和混沌的双重水印算法。对图像进行DCT分块,在低频部分利用SVD方法嵌入鲁棒水印,在高频部分用系数大小关系嵌入脆弱水印,从而实现了盲检测。仿真实验结果表明,由于鲁棒水印具有一定的抗JPEG能力,脆弱水印能抵抗较强的噪声攻击,因此该算法是有效的。

To implement the image copyright and integrality authentication, a dual watermarking algorithm based on DCT and chaos is proposed. The image is transformed by DCT, and the robust watermarking is embededd into low frequency parts by using SVD and the fragile watermarking is embedded into high frequency parts by using comparison pairs of coefficients, which implements blind detection. Simulation experimental results show that the robust watermarking is good at robustness to JPEG, and the fragile watermarking can resist to noise attack, thus this algorithm is effective.