一种基于小波的数字水印技术研究

A Study of Digital Watermark Technique Based on Wavelet

论文的数字水印算法是通过小波多分辨率分解在容噪性较强的逼近子图上嵌入数字水印,并且采用预滤波的方式获取最佳嵌入位置使得该算法的抗滤波性能大大增强。实验证明,该算法的安全性较好,可以抗各种攻击,包括压缩、滤波、剪切等。该算法还利用BMP格式文件头隐藏水印信息,加快了水印的检测和提取速度。

This paper improves a digital watermark algorithm to embed digital watermark into low frequency sub-image with good tolerance of noise and makes use of pre-filter method to get optimal embedding position so that the watermark embedded can resist filtering effectively. The experiments prove that the algorithm has fine security and that it can resist all kinds of attacks such as compressing, filtering, cutting, etc. Moreover hiding watermark information in BITMAP head accelerates watermark detecting and extracting greatly.