图像水印中扩频算法的研究

The Research on Image Watermark Spread Spectrum Method

数字水印是保护多媒体作品(图像、视频、音频)版权的有效手段,近年来在国内外引起了人们极大的兴趣。它通过在原始数据中嵌入秘密信息———水印(watermark)来证明多媒体作品的所有权。在研究DCT变换域的图像水印扩展频谱算法的基础上,运用感知性和健壮性标准对不同的图像水印扩频算法进行评价,为公正评价水印系统提供了依据。

Digital watermarking is a valid method to protect the copyright of multi-media works（such as image,video,audio）. In recent years, it has caused tremendous interests in domestic and international area. As a kind of digital watermarking technique, image watermarking technique is to hide author＇s important information in common images and audience can not identify what has been hidden. In this text, we mainly discuss a kind of image watermark spread spectrum method carried out in DCT transform domain and give discriptions in details on how to execute comparisons and analysis between different image watermark spread spectrum methods with perceptibility and robustness evaluation standards so that we can get a comparably reasonable conclusion.