一种基于最小风险假设检验的图像盲水印算法

数字水印技术是数字作品版权保护的重要手段,为了增强水印的安全性和鲁棒性,提出一种基于最小风险假设检验和人眼视觉特性的彩色图像盲水印算法.首先对原始图像进行小波分解,然后利用人眼视觉特性,在图像的中频系数中嵌入水印,在提取水印时,利用最小风险假设检验知识进行水印的提取.实验结果表明,该方法能够较好地抵抗一些常见的图像攻击,具有较强的鲁棒性和不可见性.

An Image Blind Watermarking Algorithm Based on the Minimum Risk Hypothesis Test

The technology of digital watermarking is a very important measure for the copyright protection of digital production.For the purpose of enhancing the security and robustness of watermark,in this paper,a blind watermarking algorithm for color image is presented based on the minimum risk hypothesis test and the human visual peculiarity.First of all,the original image is decomposed by wavelet,then using the human visual peculiarity a watermark is embedded in the intermediate frequency of original image,and at the process of picking-up the watermark,the knowledge of the minimum risk hypothesis test is used to get it.This algorithm can resist the familiar attack to image very well,even more,watermark is robust and is unvisible.