一种基于空间优化的彩色图像鲁棒水印算法

An Colour Robust Watermarking Method Based on Constrained Feature Space

针对彩色数字图像的版权保护问题,提出了一种基于空间优化的鲁棒性水印算法。算法将彩色图像由RGB转换到HIS(H为色度、I为亮度、S为饱和度)空间,选择饱和度S作为嵌入域并进行空间优化,将水印嵌入到最少受图像改变影响的子空间。通过对特征子空间选取限制,算法具有高的检测概率和安全性,低的虚警概率。仿真得到的结果,表明了算法具有好的鲁棒性。

To the problem of colour digital picture＇s copyright protection,we propose a watermarking method based on constrained feature space.Transforming digital colour images from RGB to HIS（S（saturation）,H（hue）,and I（intensity） space,We embed the watermark into saturation of the HIS image and constrain feature space,and obtain that the robustness of the approach lies in hiding a watermark in the subspace that is least susceptible to potential modification.Through analysis and constraint the conditions of feature subspace,the algorithm we proposed can obtain a high detection probability and security,a low false alarm probability.The robustness of the asymmetric watermarking method is demonstrated by a kind of attacks through computer simulation.