基于边缘和模型的半色调图像水印算法  

Watermarking algorithm for halftone image based on edge and model

作　　者：孔月萍[1] 鱼涛[1] 

机构地区：[1]西安建筑科技大学信息与控制工程学院,西安710055

出　　处：《计算机应用研究》2009年第11期4395-4397,共3页Application Research of Computers

基　　金：陕西省自然科学基金资助项目(2004F32);陕西省教育厅专项计划(04JK244)

摘　　要：考虑人眼视觉掩蔽特性,提出了一种基于图像边缘和模型的数字半色调图像水印算法。通过分析半色调图像边缘特性,将二值水印嵌入到半色调图像边缘区域,再结合视觉和打印模型对半色调图像进行优化,得到含水印半色调图像。仿真实验表明,该方法不会在含水印半色调图中产生明显椒盐状噪声,可取得较好的水印不可感知性。当此半色调图像打印输出,再遭受裁剪、随机涂改、JPEG压缩攻击后,仍能提取出有效的水印信息。Having considered the masking character in human visual system, proposed a watermarking algorithm for halftone images based on the edge and model. Analyzing the character of the edge in the halftone image, imbeded the watermark into the edge. Achieved a watermarked image by being optimized with models of HVS and Printer. A large amount of experiments show that the proposed algorithm doesn＇ t bring visible salt-and-pepper noise into the watermarked image, and it has good invisibility and robustness. When the watermarked image is primed and attacked by random marking, cropping and JPEG compression, the watermark can also be correctly extracted.

关 键 词：半调 数字水印 边缘 噪声可见函数 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]