基于误差修正的二值水印图像提取算法  

Algorithm to extract binary watermark image based on error correction

作　　者：吴柯[1] 

机构地区：[1]湖南理工学院计算机系,湖南岳阳414000

出　　处：《计算机工程与设计》2009年第7期1703-1704,1711,共3页Computer Engineering and Design

基　　金：湖南省教育厅科研基金项目(08C389)

摘　　要：为了减少水印算法中设置阈值带来的不便,减少水印提取时的计算量。设计了一种图像数字水印盲检测算法,分析了离散余弦变换(DCT)系数位置对水印质量的影响,采用黄金分割选取待嵌入水印的DCT系数位置。在原始灰度图像中嵌入二值水印图像,采用修改二进制DCT系数来实现水印的盲检测,水印提取时,用闭环误差修正的方法提取水印信息。分别用椒盐噪声、压缩等攻击进行实验,得到了一些有益的实验结果。该算法计算量小,隐蔽性好。In order to reduce inconvenience of setting threshold value in watermark algorithm, the amount of calculation is reduced to extracting watermark. A digital watermark of image blind detection algorithm, analysis of the discrete cosine transform （DCT） coefficients on the location to impact of watermark quality, use golden section to select DCT coefficient location embedded watermark, in original gray-images embedded in binary image watermarking, using modified binary DCT coefficients to achieve blind watermark detection, use of closed-loop error correction method extracting a watermark information. Respectively with salt and pepper noise, compression attacks carried out experiments get some beneficial results. The algorithm is small calculating, well hidden.

关 键 词：数字水印 二值图像 离散余弦变换 混沌 误差修正 黄金分割 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]