基于DWT的数字水印算法的研究 Research of Digital Watermarking Algorithm Based on Discrete Wavelet
Transformation
摘 要
随着网络技术和计算机技术的迅速发展，越来越容易获取数字多媒体信息，导致一些不法分子为了谋取盈利而制作盗版、更改版权。目前，一些传统的密码学的安全措施已经不能解决这些问题，为了对其原有者利益以及数字产品本身的保护，人们提出了数字水印技术。数字水印技术是信息隐藏技术的一个主要分支，该技术先将不可见信息嵌入到数字化媒体中，接着通过对不可见信息的检测来跟踪图像的使用状况，从而实现信息存储、隐藏、版权保护等功能。
本文基于DWT对数字水印算法进行研究，主要介绍了两种基于DWT数字水印算法的嵌入和提取，并在MATLAB环境中仿真实现。对两种算法的嵌入水印图像进行攻击，分析比较两种算法的优劣。本设计是对现有的数字水印技术作一个基础性研究，从中认识到数字水印技术在生活中起到了重要的作用，从而避免数字水印经过不当操作后被损毁而无法提取。
关键词：数字水印 DWT 嵌入 提取
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Abstract
With the rapid development of computer and network technology, the information of digital multimedia has been more and more easy to be gained.So some criminals change the copyright piracy in order to seek profit making.At present,some traditional safety measures of cryptography has been unable to solve these problems.In order to protect the interests of the original and digital products itself,people put forward the digital watermarking technique.Digital watermarking is a main part of information hiding technology.At first,the technique embed the invisible information into the digital media.Then,through the invisible detection information to track usage of the image.Thus,it can achieve information storage,hidden,copyright protection and other functions. Content of this paper is to study digital watermarking algorithm based on DWT.This article mainly describes two kinds of embedding and extraction based on DWT digital watermarking algorithm.Then,simulating in MATLAB environment.Comparing the advantages and disadvantages of the two algorithm after attacking the image embed watermark.This design is a fundamental research to the existing digital watermarking technology.Recognizing the effect of digital watermark played in our life .So we can avoid watermark damaged through improper operation.
Key words: digital watermarking DWT embedding extraction
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基于DWT的数字水印算法的研究
