一种新的基于域相关算法的图像易损水印技术

给出了一种在空域中嵌入有意义易损水印的算法，嵌入有意义的水印与无意义的伪随机序列相比，具有明显的优势。该文的方法，首先根据密钥随机选取一组图像像素以及它们的邻域，由邻域中像素的相关性选取出一个参考水印点，通过参考点和水印值来共同调整选出的图像像素值，从而完成水印信息的隐藏。检测时不需要原始图像。实验结果表明算法对有损压缩、数据替换等各种篡改操作具有很强的敏感性，通过归一化相关系数等方法可对数据的完整性做出结论。

A New Fragile Watermark Technology for Digital Image Based on the Domain Coherence Algorithm

A fragile watermark algorithm embedding meaningful watermark into spatial domain of an image is proposed.It's obvious that there is more advantage embedding meaningful watermark than embedding pseudo random sequences. First, some pixels and their neighborhood are randomly selected using a secret key, then, based on the coherence among neighborhood pixels, some reference pixels are selected correspondingly. The selected pixel is adjusted by the reference pixel and the watermark value. The experimental results show that the algorithm is reasonable and sensitive to several operations such as lossy compression, data replacement.