用于图像认证的小波域半易损水印算法

提出了一种新颖的用于图像认证的半易损水印算法,该算法提取图像在小波低频域的特征信息生成两个水印,一个水印主要用于篡改定位,另一个水印主要用于区分图像所经历的偶然修改和恶意篡改,从而提供了一种有效的图像选择认证机制.此外,该算法的水印生成和嵌入都在图像本身中进行,图像认证时不需要原始图像和任何有关水印的附加信息,从而提高了水印的安全性和保密性.实验结果表明,此算法能很好地将对图像内容的恶意篡改和偶然修改区分开来,并可以给出内容篡改的位置.

Wavelet Domain Semi-fragile Watermarking Algorithm for Image Authentication

A new semi-fragile watermarking algorithm for image authentication is introduced. In this algorithm, two watermarks are generated by extracting the image feature from the low frequency domain, one of the watermark is used for classifying of the intentional content modification,and another is used for indicating the modified location, so it has provided a effective mechanism for image authentication. In addition, the watermark generation and watermark embedment are disposed in the image itself, and the received image authentication needs no information about the original image or watermark, so it will increase the security of watermark and prevent forged watermark. Experimental results show the algorithm provides very good classification of intentional content modification and incidental tampering, and also can indicate the locations that have been modified.