基于曲面拟合的彩色图像数字水印算法  

A Digital Watermarking Algorithm of Color Images Based on Surface Fitting

作　　者：鲁坚[1] 涂广毅[1] 吴海燕[1] 

机构地区：[1]深圳大学数学与计算科学学院,广东深圳518060

出　　处：《计算机与现代化》2014年第7期133-136,共4页Computer and Modernization

基　　金：国家自然科学基金资助项目(61003178;11201312;11071150);深圳市科技计划基础研究项目(JC201105170615A;JC201005280508A)

摘　　要：探讨一种基于曲面拟合的彩色图像数字水印嵌入与提取算法。该算法在曲面拟合方案中采取自适应分割的方法将图像分割为16×16、8×8和4×4三种尺寸的子块,选取4×4的子块来嵌入水印信息,为提高水印的鲁棒性,对选取的4×4的子块采用伪随机置乱的方式将子块的顺序置乱,然后将伪随机置乱后的水印比特加载到子块的曲面某一个较稳定的参数上。同时为消除曲面拟合带来的误差,采用误差补偿的方式提高嵌入水印后载体图像的质量。实验表明,新算法能有效地抵抗压缩、滤波、噪声和剪裁等常见的攻击,具有很强的鲁棒性。A digital watermarking algorithm for color images is discussed .The proposed method applies a self-adaptive segmenta-tion technique to divide an image into three classes with different sub-block sizes, such as 16 ×16, 8 ×8 and 4 ×4, and chooses those blocks with size of 4 ×4 to embed the watermarks .In order to get robust performance , the method scrambles the 4 ×4 block by a pseudo random scheme , then embeds the watermarks to the scrambled blocks .To reduce the error that caused by surface fit-ting, we use error compensation technique to improve the quality of the watermarked image .The results show that the algorithm is robust against various typical attacks , such as compression, filtering, noising and shearing.

关 键 词：曲面拟合 数字水印 鲁棒性 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术]