基于DCT与双随机矩阵的图像数字水印方案

Image Watermarking Based on Discrete Cosine Transformation and Doubly Stochastic Matrix

在水印的嵌入与检测过程中用到了 3个密钥 ,双随机矩阵和嵌入尺度作为秘密钥保证了水印嵌入的安全性 ,DCT系数矩阵之和则作为公开钥用于水印信息的部分认证 文中算法实现了将图像作为水印信息隐藏到载体图像中 ;把水印信息的每一点都通过某种方式嵌入到载体图像的多个点上 ;使得攻击者在不知道秘密钥的情况下无法删除或改变水印信息 通过实验对嵌入和检测结果进行了比较和分析 。

This novel DCT-based approach has three keys, the doubly stochastic matrix along with its coefficients are used to embed watermarking and play the role of private keys, while summation of transformation matrix of watermarking serves as public key. Its detection process is composed of two parts: one needs secrete key, while the other only needs public key. When both parts are correct, the detected image restores the original watermarking.