基于混沌加密的图像数字水印算法研究

A Research on Chaotic Encryption of Digital Watermarking Algorithm of Image

提出了一种基于混沌加密的图像数字水印算法,该方法是将载体图像作8x8的分块DCT变换,水印图像映射为混沌序列,用载体图像的分块DCT中频系数与混沌序列相加嵌入水印。实验结果表明,图像混沌变换有较高的鲁棒性,水印算法具有安全性高、算法简单以及较好的视觉掩蔽性。

This paper presents an algorithm of image digital watermarking in DCT domain based on chaotic eneryption. In this algorithm, cover image is transformed into 8 × 8 block using DCT, and watermark image is mapped into chaos sequence. Then the mid - band of DCT block coefficients of cover image axe used to add chaos sequence to embed watermark. Experiments results show that image chaos transform has better robustness, and this watermark algorithm is simple, and has high security and better vision masking.