一种鲁棒的多水印嵌入和检测算法与仿真

A robust Embedding and Detecting Algorithm for Multiple Watermarks and Its Simulation

提出了一种鲁棒的多水印嵌入与检测算法,该算法基于小波域,且提取水印时不需要原始图像,保护了原始图像的安全。在该多水印算法中,提出并使用了一种将密码学和常规的数字水印制作方法---叠加法和量化调制法,有机结合起来的新的方法,在水印嵌入时,不同的水印,生成与该水印相关的不同的密钥,在进行水印的提取时,用不同的密钥和待测的图像提取出相应的水印。通过将密钥向第三方注册,可以获得对原始图像的所有权。该算法思路新颖,算法运行效率高。该算法在matlab6.1已实现,该文给出了该具体算法,并对加有多水印的图像进行了JPEG压缩、加高斯噪声、图像剪切和中值滤波等仿真实验,仿真结果表明用该算法嵌入的多水印有理想的鲁棒性。

A new algorithm for multiple watermarks based on DWT is proposed and the original image is not required for detecting the multiple watermarks. Using this algorithm, the original source is protected well. In this novel algorithm, we combine the cryptography with the conventional water marking methods - - - addition and quantization index modulation（QIM） together. When embedding the watermarks , different watermarks produce different secret keys associated with the embedded watermarks. When extracting the watermarks, different keys produce the different watermarks. The secret keys are then registered to the third party to protect the ownership of the original source. Many simulation experiments have been done, such as JPEG compression Gaussian noise, median filtering and image cropping. The simulation experimental results show that the embedded digital watermarks with the proposed algorithm are invisible and robust enough.