一种基于小波变换的图像完整性验证水印算法

针对现有的图像完整性验证水印技术,提出了一种小波域的图像完整性验证水印算法,该算法对小波系数块进行均值量化来实现二值水印信息的嵌入,在鲁棒性和脆弱性方面达到很好的平衡。仿真实验结果证明,该算法能抗常规的非恶意攻击,对于恶意攻击具有很强的识别和定位能力。

A Digital Watermarking of Detecting the Image Integrity Based on DWT

The paper designs an image authentication method of semi-fragile watermarking technique based on DWT.The watermark bits are embedded in the average value of the four adjacent wavelet coefficients with quantization since the average value has better stability than single wavelet coefficient.The experiment results show this method is robust to common image process and fragile to malicious attack,i.e.this method can detect the tampered portions.