基于DWT的数字图像水印技术及MATLAB实现  

An Image Digital Watermarking Technology Based on DWT by MATLAB

作　　者：李欣[1] LI Xin （College of Information Engineering, Shanghai Maritime University, Shanghai 200135, China）

机构地区：[1]上海海事大学信息工程学院,上海200135

出　　处：《电脑知识与技术》2010年第10期8078-8080,共3页Computer Knowledge and Technology

摘　　要：数字水印技术是近年来图像保护技术研究领域的一个热点，该文提出一种基于离散小波变换（Discrete Wavelet Transform．DWT）数字水印嵌入算法，并在MATLAB中进行仿真实验。这种算法充分利用小波变换的特点，采用Haar基小波，把原始图像及水印图像塔式分解，然后在多分辨率分解后的频段嵌入水印信息，最后从加水印图像中提取水印，算法简明而有效。实验表明该算法具有较好的水印不可见性与鲁棒性。The digital watermarking technology is the most active topic in image protecting. In this paper, a digital watermarking algorithm based on Discrete Wavelet Transform （DWT） is proposed and the experimental results are given in MATLAB. The algorithm makes full use of the characteristics of wavelet transform. The original images and watermarks are pyramidal transformed using Haar wavelet, and wa- termark was embedded in the corresponding frequency after multi-resolution decomposition. Watermark information could be extracted from the watermarked image at last. The proposed method is simple and efficient. Experiments results show that this algorithm produces good watermark invisibility and robustness.

关 键 词：小波变换 DWT 数字水印 图像保护 MATLAB 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论;自动化与计算机技术—计算机科学与技术]