图像版权保护与认证的双水印算法  

Dual Watermarking Algorithm of Image Copyright Protection and Authentication

作　　者：吴柯[1] 

机构地区：[1]湖南理工学院计算机与信息工程系,湖南岳阳414000

出　　处：《计算机技术与发展》2009年第9期136-139,共4页Computer Technology and Development

基　　金：湖南省教育科研基金项目(08C389)

摘　　要：为了实现数字图像的版权保护与认证,设计了一种基于离散余弦变换(DCT)和离散小波变换(DWT)的双数字水印算法,一个水印鲁棒性强,用于版权保护,另一个是脆弱水印,用于图像认证。水印同时嵌入,不需要考虑嵌入顺序,根据验证目的的不同水印可以同时或单独提取。通过将原始灰度图像像素矩阵经离散小波变换,在低频子图中嵌入鲁棒水印一,对水平细节子图再进行离散余弦变换,在中频系数中嵌入脆弱水印二。该算法实现简单,计算量小,隐蔽性好,可实现对恶意篡改的块定位。In order to achieve digital image copyright protection and authentication, designed double- digital watermarking algorithm based on discrete cosine transform （DCT） and discrete wavelet transform （DWT）, a robust watermark for copyright protection, and the other is fragile watermark for image authentication. Two watermark embedded at the same time, embedded in the order do not need to consider, in accordance with the purpose of different verification watermarks can he extracted at the .same time or separatdy. Original pixel matrix by DWT, in the low- frequency sub-image to embed a robust watermark, the level of details sub- image by the discrete cosine transform, fragile watermark embedded in the mid - frequency coefficient. The algorithm is simple, computation of small, well hidden. It can recognise malicious tampering block positioning.

关 键 词：数字水印 版权保护 图像认证 离散余弦变换 离散小波变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]