摘要
提出了一种图像四叉树矩形剖分下的自适应数字水印算法。通过对原始图像在多个尺度上进行最小二乘多项式逼近,将图像进行非均匀剖分,并以四叉树结构的形式进行表达。该四叉树结构既实现了对原始图像的逼近,同时携带了图像的纹理结构信息。通过统计各子区域上的剖分网格数目,计算不同区域上水印嵌入的强度,从而实现自适应数字水印方案。实验结果表明,该算法具有良好的透明性和顽健性。
An adaptive digital watermarking algorithm based on image quad-tree partition was proposed. The origi- nal image was approximated by various least square polynomial patches at multiple scales and was organized by a quad-tree structure. At the same time, this representation also reflected the texture information of image. By calculating the watermark embedding intensity in different regions, an adaptive digital watermarking scheme based on the number of the refined meshes in each region was realized. The experiment results show that this algorithm has the good imperceptibility and robustness.
出处
《网络与信息安全学报》
2017年第12期40-47,共8页
Chinese Journal of Network and Information Security
基金
国家自然科学基金资助项目(No.61602213)
国家科技支撑计划基金资助项目(No.2015BAH54F00)~~
关键词
图像剖分
四叉树
最小二乘
水印
image partition, quad-tree, least square, watermarking
