DCT域迭代混合的数字图像水印  

Digital image watermarking of iterative blending using discrete cosine transform

作　　者：彭琼[1] 张定会[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《信息技术》2013年第9期179-181,185,共4页Information Technology

摘　　要：提出了基于离散余弦变换和迭代混合的图像水印算法。选取图像DCT域的中频系数,对其运用迭代混合技术嵌入水印,用新的DCT系数置换原来位置的DCT系数。本系统主要包括水印的嵌入、水印的提取和水印的攻击实验三部分,其中水印图像的攻击试验又包括三种攻击试验:椒盐噪声干扰、滤波和剪切攻击,利用这三种攻击来测试水印算法的性能。仿真实验结果表明,该水印算法对于噪声干扰、滤波和剪切攻击都具有较好的鲁棒性,也是图像迭代混合思想成功应用于数字水印方面的一个例子。An algorithm of DCT（ Discrete Cosine Transform）and iterative blending is proposed to embed a watermark in the medium frequency of DCT domain of a digital image. This system includes three parts, the watermark embedding, the watermark extraction and watermark attacks. The attack tests for watermarked image include three kinds of attacks ： salt and pepper noise, filtering and cutting, using the three attacks to test the watermarking algorithm＇ s performance. The simulation results show that the algorithm has a better robustness to the noise, filtering and cutting attacks, which is also a successful application for the iterative blending technology in the digital watermark

关 键 词：数字水印 数字图像 离散余弦变换 迭代混合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]