关键词: 虚拟水印, 自恢复技术, 双重数字水印

Abstract:

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.

Key words: virtual watermark;self-restoring technology;dual watermarking