基于图像内容的非确定性的易损水印算法

Fragile Watermark Algorithm Based on Non-deterministic Characteristics of Image Content

给出了一种在空域中嵌入有意义易损水印的算法,算法中引入基于图像内容的非确定性来增强算法的安全性,由邻域中像素的相关性确定水印的参考点,通过参考点和相应的水印值来共同调整图像像素值,从而完成水印信息的嵌入。实验结果表明算法对数据替换、裁剪等各种篡改操作具有很强的敏感性,经过算法的后处理,算法具有良好的局部检测性能。

A fragile watermarking algorithm embedding a meaning watermark into spatial domain of an image is proposed. Non deterministic characteristics based on image content is adopted to improve the security of the algorithm. The conference pixels are determined by information of the pixels from its neighborhood centered at that pixel. Every pixel＇s value is adjusted according to conference pixels and its related watermark bit to embed a watermark bit. The experimental results show that the algorithm is sensitive to modification of data replacement, cut and etc.. The proposed algorithm is capable of localizing modification.