基于子块分割的自适应式全盲图像水印算法  

Adaptive Blind Watermarking Algorithm Based on Sub-block Segmentation

作　　者：刘炜 程聪聪[2] 裴孟丽 佘维 LIU Wei;CHENG Cong-cong;PEI Meng-li;SHE Wei(School of Software and Applied Technology,Zhengzhou University,Zhengzhou 450000,China;Collaborative Innovation Center for Internet Healthcare,Zhengzhou University,Zhengzhou 450000,China)

机构地区：[1]郑州大学软件与应用科技学院,郑州450000 [2]郑州大学互联网医疗与健康服务河南省协同创新中心,郑州450000

出　　处：《计算机科学》2018年第10期178-182,216,共6页Computer Science

基　　金：河南省基础与前沿技术研究项目(152300410047);河南省高等学校重点科研项目(15A520028);河南省产学研合作项目(182107000053);郑州大学研究生核心学位课程项目(YJSXWKC201540);赛尔网络下一代互联网技术创新项目(NGII20160705)资助

摘　　要：为了提高水印的鲁棒性,文中提出了一种基于子块分割的自适应全盲水印算法ABWASS。在嵌入水印时,该算法根据宿主特征矩阵嵌入自适应调整后的水印图像,并使用改进的两阶段DWT方法在LH2子带中融入水印图像的关键信息,从而得到含双重水印的图像;提取水印时,首先分离水印分块方式等关键信息,并通过DCT变换获得特征矩阵,进而提取水印图像。由于该方法在获得含有水印的图像时,根据宿主图像对水印进行了微调,并嵌入了原始水印尺寸,因此在提取过程可以实现全盲。实验结果表明,较已有方法,所提算法能够很好地抵抗多数常规攻击和几何攻击,并且在抵抗混合攻击上其性能均得到了提高,最大提升了2.7%;同时,其还具备较好的水印隐蔽性和实用性。To improve the robustness of watermarking,this paper proposed an adaptive full-blind watermarking algorithm based on sub-block segmentation(ABWASS).In the embedding of watermark,it embeds the adaptive watermark according to the characteristic matrix of the host image and integrates the key information of the watermark into the LH2 sub-band by using the improved 2-phase DWT,so as to obtain the watermarked image with dual watermarks.In the process of watermark extraction,firstly it separates key information for blocking and then gets the characteristic matrix by DCT to extract the watermark.The embedding of key information for blocking makes this proposed algorithm be a full-blind watermarking.Experimental results show that the proposed algorithm performs well in most conventional attacks and geometric attacks and performs better in all mixed attacks with the maximum increment of 2.7%,and it also has good invisibility and practicability.

关 键 词：数字水印 子块区域分割 全盲检测 自适应 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]