一种自适应半脆弱数字水印算法

结合人眼视觉特性及数字图像的自相关性,提出一种具有自适应性的半脆弱数字水印算法。该算法采用改进的低通滤波器,对于中低频图像信息,通过动态的自适应调节中间像素灰度,改变两端的灰度差分来实现水印的嵌入。实验表明该算法对所有等级的JPEG压缩均具有很好的鲁棒性,并且对图像擦除、加噪、挤压等恶意篡改具有脆弱性、敏感性以及准确的检测定位能力。

Adaptive Semi-Fragile Digital Watermarking Algorithm

Presents an adaptive semi-fragile digital watermarking algorithm,which is based on the image of the relevant and human visual system.For the middle and low frequency image information,the algorithm adaptive adjusts gray-value of middle pixel and changes gray-value differential of both ends to embed the digital watermarking by using improved low-pass filter.The experiment shows that the algorithm can resist against all levels JPEG compression,and has sensitivity and precise localization for tamper detection such as image of cut,additive noise or extrusion etc.