用于版权保护的数字图像双水印算法

提出一种用于版权保护的数字图像双水印方案.采用不可见水印的鲁棒性来保护可见水印图像的双水印,同时嵌入可见水印和不可见水印来完成版权保护.可见水印是在空间域中采用分段像素值映射算法(PPVMA)的无损可见水印,在直观上预防了未经授权的使用.对于不可见水印,采用高抗攻击的量化水印算法.在提取水印后采用维纳滤波对所提取的水印噪声去除,使得水印清晰度增强.实验表明,在视觉可见性上其具有较强的保真度,不可见的量化水印具有较高的鲁棒性,二者结合的双水印系统成功地完成了数字图像的版权保护.

Dual watermark algorithm for copyright protection of digital images

By using the robustness to protect the visible watermark,and embedding both visible and the invisible water marks,this article presents an algorithm for the copyright protection of digital images.Piecewise pixel value matching algorithm(PPVMA) is used to watermark a visible logo which defends the non-authorized use on vision.As for invisible watermark,high attack-resistance quantization watermarking algorithm is applied.Wiener filter is also used to filter the noise to strengthen the clearance of the watermark.The experiment demonstrates the relatively strong fidelity of virtual visibility and the relatively high robustness of the invisible quantized watermark,and the dual watermark system by combining the two characters effectively achieves the copyright protection of the digital images.