基于Krawtchouk不变矩的仿射攻击不变性局部水印算法

本文提出了一种基于原始图像Krawtchouk不变矩实现的仿射攻击不变性局部水印算法.具体介绍了Krawtchouk不变矩的构造方法,水印是事先产生的且与原始图像无关,通过将水印嵌入到图像的Krawtchouk不变矩中实现仿射攻击不变性.这种基于Krawtchouk矩的水印算法是局部水印技术,即水印的嵌入只是影响到部分原始图像,因此该算法对剪切攻击具有很好的鲁棒性.检测过程中采用独立分量分析技术实现真正意义上的盲检测.文中具体分析了所提出算法的计算复杂度,实验数据说明这种水印算法对通用水印测试软件Stirmark具有很好的鲁棒性.

Affine Transform Invariant Image Local Watermarking by Krawtchouk Moment Invariants

An affine transform invariant local watermarking is designed and test against attacks performed by Stirmark using the Krawtchouk moment invariants.Watermark is inserted into the perceptually significant Krawtchouk moment invariants.Watermarking based on Krawtchouk moment invariants are local,that is,the embedded watermark affects only a selected portion of the original image,the position of which can be decided by user.This means that the watermark is especially robust to cropping.Independent Component Analysis(ICA) is adopted by detector to extract the perfect watermark blindly.The computational aspects of proposed watermarking are also detailed.Experimental results have demonstrated that the proposed watermarking technique has a good robustness against watermark benchmark Stirmark.