一种用于图像篡改定位与恢复的双水印算法

摘要

The concept of virtual watermark is introduced.A new digital image algorithm of double watermark is proposed on the basis of such watermarking technologies as self-restoring and wavelet transform.After the second wavelet transforming of the original image,the low-frequency part turns into the first watermark,and the digital product company is labeled as the second watermark.Then,this algorithm takes advantage of the characteristic of the dual watermarking algorithm to set up a mapping between two watermarks.The experiment results show that the algorithm is simple and efficient,and has such functions as watermark recovery,authentication of copyright,tamper orientation and recovery.%引入虚拟水印的概念,结合自恢复技术,小波变换等水印技术,提出了一种新的数字图像双水印嵌入算法。文中将原图像二次小波变换后的低频分量LL2作为第一重水印,将数字产品公司标识作为第二重水印,同时利用双水印技术所特有的属性,在两重水印之间构筑函数关系,将其结合在一起。实验结果表明,该算法简单高效,可同时具有水印恢复、版权认证和篡改区定位恢复等多方面的功能。