基于小波变换的图像数字水印技术的研究

随着信息技术和计算机网络技术的迅速发展,数字化产品越来越多,随之而来的数字化产品的版权保护和所有权认证问题必须得到很好的解决。从而数字水印技术应运而生。论文首先简单介绍了数字水印的起源、研究内容,接着阐述了数字水印技术的特点,分类,基本框架,各种常见数字水印算法,评价标准及各种攻击手段。最后确定从小波变换入手,介绍了一种稳健的DWT域图像水印算法,实现了数字水印的嵌入和提取,并使用剪切、滤波、添加噪声等几种攻击手段验证该算法的鲁棒性。本算法主要具有抗基本攻击鲁棒性较好地优点,是一种简单易实现,嵌入水印效果好,提取水印效率高的算法。

Along with the rapid development of information and computer network technology, more and more digital products appears, which brings the copyright protection and property authentication of digital products should be well resolved. And the solution to this problem is the digital watermarking embedding technology.To start with, the article introduces the origin and the research content of the digital watermark. Moreover the article claborated the digital watermark technology theories ,the sort of the digital watermark ,the evaluation criteria and all kinds of attack .Lastly, the article introduces one kind of vigorous and healthy DWT algorithm about digital watermark inserting and extraction after describing DWT transformation.And it confirms the watermark robustness using several attack methods, such as cutting, filtering, increasing noise and so on. The technology proposed is easy to realize with well watermarked image and high efficiency of watermarking extraction.