基于小波技术的数字水印方法研究及应用

Research and application of digital watermark based on wavelet technology

本文主要讨论在小波域嵌入数字水印的研究。在低频区域嵌入水印,其稳定性好,但容易被人眼察觉;高频域嵌入水印不易被察觉,但稳定性差、易遭到恶意攻击。本文选择在低频和高频区分别嵌入水印,并选择不同的嵌入强度。水印图像选择具有特殊意义的二值图像‘吉林大学’水印,用Matlab7.6.0(R2008)仿真。实验表明,本算法对压缩、滤波、噪声攻击有很强的鲁棒。

This paper focuses on the research of digital watermark embedded in wavelet domain. The digital watermark embedded in the low frequency region is stable, but easy detected by human eyes, while is not so noticeable but vulnerable to attack in the high frequency. This paper embeds watermark both in low frequency and high frequency, and selects different embedding strength for different frequent. The author picked up the binary image of Jilin university as watermark image and made an experiment on the algorithms in the environment of Matlab7.6.0 （R2008）. The results showed that this algorithm had great robustness to compression, filtering and noise attack.