基于分块量化的小波域数字水印嵌入算法  

Image Watermarking Based on Block Quantization in DWT Domain

作　　者：董敏[1] 王向阳[2] 

机构地区：[1]铁岭师范高等专科学校信息网络中心,辽宁铁岭112001 [2]辽宁师范大学计算机与信息技术学院,辽宁大连116029

出　　处：《微电子学与计算机》2007年第7期31-34,共4页Microelectronics & Computer

基　　金：辽宁省自然科学基金(20032100);国家重点实验室开放基金(0503);大连市科技基金(2006J23JH020);江苏省重点实验室开放基金(ZK205014;KJS0602)

摘　　要：提出了一种基于分块量化的小波域数字水印嵌入算法,该算法具有如下特点:⑴以图像局部相关特性为基础,采纳了分块量化策略;⑵以人眼视觉感知特性为基础,构造了量化步长的自适应选取方案;⑶结合误检概率分析,给出了检测阈值T的一般性选取方法。仿真实验表明,该算法不仅具有较好的透明性,而且对诸如叠加噪声、JPEG压缩、平滑滤波、几何剪切、图像增强等攻击均具有较好的鲁棒性。A new image watermarking algorithm based on block quantization in the DWT domain is proposed in this paper. The features of this algorithm are as follows： （1）Block quantization strategy based on local image characteristics is adopted, （2）The quantization step can be dynamically adjusted according to the characteristics oh human visual system, （3）The general method of selecting detection threshold T is given by analyzing the probability of false watermark detection. Experimental results show that the proposed watermarking algorithm is invisible and robust against various signal processing such as cropping, compression, filtering, noise adding, and image enhancement.

关 键 词：数字水印 分块量化 视觉感知性 局部相关性 误检率 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]