基于图像内容水平线的水印算法

Authentication Watermarking based on Image Content Kevel-line

给出了一种把图像自身特征——水平线作为水印嵌入到图像的内容认证算法.该算法从宿主图像中提取出水平线,并对此水平线作Arnold变换得到最终嵌入水印序列,将宿主图像分成互不干扰的子块,对每个子块作一阶小波变换,同时考虑了HVS的掩蔽特性,并计算出每个子块的可见噪声门限JND值,实现水印的自适应嵌入.实验证明该算法在水印透明性与鲁棒性方面具有较好的性能,并实现水印的盲提取.

In this paper,by taking full advantage of the masking characteristics of the HVS（Human Visual System）,the thesis first presents a semi-fragile watermarking scheme which embeds the level-line,extracting from the image,in the DWT（Discrete Wavelet Transform）domain.It is no need the original image when extracting the watermarking.Moreover,when detecting and locating tampered areas,the original watermark is not necessary.The experiment results show that the algorithm has a good invisibility and high robustness against non-malicious attacks,and also Can locate the tampered areas roughly.